13 20 1651 https://dev.geosciencecollections.milne-library.org/files/original/b5a05091c8d8e39586245458ef60b215.JPG 350f1a0044458b0132212244c6b36c48 Omeka Image File The metadata element set that was included in the `files_images` table in previous versions of Omeka. These elements are common to all image files. Width 1224 Height 1632 Bit Depth 8 Channels 3 Dublin Core The Dublin Core metadata element set is common to all Omeka records, including items, files, and collections. For more information see, http://dublincore.org/documents/dces/. Title A name given to the resource (KBR) Karroo Igneous Complex -- Birds River, South Africa Description An account of the resource The Birds River Complex is a "Bell-Jar" intrusion first described by du Toit in 1905 and then by Ealey and Robey in 1976. One of the best exposed sections across the margin of the complex is on the farm Denwood, in the southwestern corner of the complex. The samples were collected from a mafic intrusion near Denwood farm. These samples from the Karroo Complex were collected from the previously studied section of the complex and neighboring areas. Contributor An entity responsible for making contributions to the resource Dr. Brian Lock, Rhodes University Western Minerals, Inc. References A related resource that is referenced, cited, or otherwise pointed to by the described resource. Start Here: Cox, K.G., 1972, The Karroo Volcanic Cycle: Journal of the Geological Society, v. 128, p. 311-336.Â doi: 10.1144/gsjgs. 128.4.0311. <ul><li>The petrogenesis of the Mesozoic igneous rocks of south-Eastern Africa is related to the tectonic event believed to be the initiation of the break up of Gondwanaland. The cycle began with the rise of potassium-rich picritic magma, the source material for rocks of the northern province, Rhodesia. On top of and peripheral to the main magma body, a zone of sodic magma was generated and formed some of the rocks of the north and most southern rocks.</li> </ul> Additional resources: White, R.S., 1992, Magmatism During and After Continental Break-Up, Geological Society, London, Special Publications, v. 68, p. 1-16. doi:Â 10.1144/GSL.SP.1992.068.01.0. <ul><li>Magmatism that goes along with continental break-up is caused primarily by decompression melting of the underlying mantle as it rises up beneath the rift. The amount of melt produced is determined by the asthenospheric mantle temperature and on the rate of rifting.Â </li> </ul>Eales, H.V., and van Robey, J.A., 1976, Differentiation of Tholeiitic Karroo Magma at Birds River, South Africa, Contributions to Mineralogy and Petrology 10. v. 56, p. 101-117. doi:Â 10.1007/BF00375423 <ul><li>Strongly fractionated residue from the partial crystallization of tholeiitic gabbroic magma was emplaced at depth within sediment of the upper part of the Karroo succession. The residue was most likely tapped from a deeper intrusion during cauldron subsidence, but was engulfed by a later intrusion of olivine gabbro on a large scale.</li> </ul> Walker, F., and Poldervaart, A., 1949, Karroo Dolerites of the Union of South Africa, Geological Society of America Bulletin, v. 60, p. 591-706. doi: 10.1130/0016-7606(1949)60[591:KDOTUO]2.0.CO;2 <ul><li>The Karroo dolerites are the result of the intrusive phase of the early Jurassic basalts that built up the Basutoland lava plateau. Most of the dolerites show little differentiation but olivine rich types and acidic veins have been recorded. The magma had an effect on the sedimentary rocks; many of the rocks described as granophyre were found to be transformed siltstone. The dolerites occur as sills and dikes but "bell-jar inclusions" occur (the Bird's River complex is a bell jar shaped inclusion).Â </li> </ul> Eales, H.V., and Booth P.W.K., 1974, The Birds River Gabbro Complex, Dordrecht District, Transactions of the Geological Society of South Africa, v. 77, p. 1-15. <ul><li>On the gabbros of the Birds River Complex.</li> </ul> Rock A physical material with a mineral composition. Unit Formation or other descriptive rock category Lesotho Formation Dublin Core The Dublin Core metadata element set is common to all Omeka records, including items, files, and collections. For more information see, http://dublincore.org/documents/dces/. Title A name given to the resource Metasomatised Pyroclastics Description An account of the resource The metasomatised pyroclastics are from the farm Thysfontein. They are baked and well indurated. Induration is the hardening of rocks by heat or baking as well as the hardening of sediments by cementation or compaction. The pyroclastics are metesomatised, chemically altered by hydrothermal fluids. It has coarse to medium grained, holocrystalline,and hypidiomorphic-granular texture. There are black subhedral crystals (1 mm- 4 mm). The surface is weathered to be white and yellow. There are 1 mm- 2 mm pock marks of red staining on the fresh surface. Abstract A summary of the resource. <a href="http://link.springer.com/article/10.1007/BF00375423">Differentiation of tholeiitic Karroo magma at Birds River, South Africa</a> Date A point or period of time associated with an event in the lifecycle of the resource No date given. Contributor An entity responsible for making contributions to the resource Western Minerals, Inc. Is Part Of A related resource in which the described resource is physically or logically included. http://www.geosciencecollections.milne-library.org/collections/show/17 Identifier An unambiguous reference to the resource within a given context KBR-17 Spatial Coverage Spatial characteristics of the resource. Karoo- Birds River, Eastern Cape, South Africa Temporal Coverage Temporal characteristics of the resource. 183-179 Ma (Jurassic) Accrual Method The method by which items are added to a collection. Purchased from Western Minerals, Inc. https://dev.geosciencecollections.milne-library.org/files/original/356209a117d63c3a8fd3cb0fe20ea6fc.JPG fbfafca04cdb040e391b23de3f217284 Omeka Image File The metadata element set that was included in the `files_images` table in previous versions of Omeka. These elements are common to all image files. Width 1936 Height 2592 Bit Depth 8 Channels 3 Dublin Core The Dublin Core metadata element set is common to all Omeka records, including items, files, and collections. For more information see, http://dublincore.org/documents/dces/. Title A name given to the resource 607_Dolerite_1 https://dev.geosciencecollections.milne-library.org/files/original/c513bfd66331a030a430b874ece048f8.JPG 0cf0cedd562c676f0456106cb660df10 Omeka Image File The metadata element set that was included in the `files_images` table in previous versions of Omeka. These elements are common to all image files. Width 2560 Height 1920 Bit Depth 8 Channels 3 https://dev.geosciencecollections.milne-library.org/files/original/5f0d09fb7a4dbd443eea7e2021c4bd54.JPG 652b28d2972f341988ee7f0c76791290 Omeka Image File The metadata element set that was included in the `files_images` table in previous versions of Omeka. These elements are common to all image files. Width 2560 Height 1920 Bit Depth 8 Channels 3 Dublin Core The Dublin Core metadata element set is common to all Omeka records, including items, files, and collections. For more information see, http://dublincore.org/documents/dces/. Title A name given to the resource (KBR) Karroo Igneous Complex -- Birds River, South Africa Description An account of the resource The Birds River Complex is a "Bell-Jar" intrusion first described by du Toit in 1905 and then by Ealey and Robey in 1976. One of the best exposed sections across the margin of the complex is on the farm Denwood, in the southwestern corner of the complex. The samples were collected from a mafic intrusion near Denwood farm. These samples from the Karroo Complex were collected from the previously studied section of the complex and neighboring areas. Contributor An entity responsible for making contributions to the resource Dr. Brian Lock, Rhodes University Western Minerals, Inc. References A related resource that is referenced, cited, or otherwise pointed to by the described resource. Start Here: Cox, K.G., 1972, The Karroo Volcanic Cycle: Journal of the Geological Society, v. 128, p. 311-336.Â doi: 10.1144/gsjgs. 128.4.0311. <ul><li>The petrogenesis of the Mesozoic igneous rocks of south-Eastern Africa is related to the tectonic event believed to be the initiation of the break up of Gondwanaland. The cycle began with the rise of potassium-rich picritic magma, the source material for rocks of the northern province, Rhodesia. On top of and peripheral to the main magma body, a zone of sodic magma was generated and formed some of the rocks of the north and most southern rocks.</li> </ul> Additional resources: White, R.S., 1992, Magmatism During and After Continental Break-Up, Geological Society, London, Special Publications, v. 68, p. 1-16. doi:Â 10.1144/GSL.SP.1992.068.01.0. <ul><li>Magmatism that goes along with continental break-up is caused primarily by decompression melting of the underlying mantle as it rises up beneath the rift. The amount of melt produced is determined by the asthenospheric mantle temperature and on the rate of rifting.Â </li> </ul>Eales, H.V., and van Robey, J.A., 1976, Differentiation of Tholeiitic Karroo Magma at Birds River, South Africa, Contributions to Mineralogy and Petrology 10. v. 56, p. 101-117. doi:Â 10.1007/BF00375423 <ul><li>Strongly fractionated residue from the partial crystallization of tholeiitic gabbroic magma was emplaced at depth within sediment of the upper part of the Karroo succession. The residue was most likely tapped from a deeper intrusion during cauldron subsidence, but was engulfed by a later intrusion of olivine gabbro on a large scale.</li> </ul> Walker, F., and Poldervaart, A., 1949, Karroo Dolerites of the Union of South Africa, Geological Society of America Bulletin, v. 60, p. 591-706. doi: 10.1130/0016-7606(1949)60[591:KDOTUO]2.0.CO;2 <ul><li>The Karroo dolerites are the result of the intrusive phase of the early Jurassic basalts that built up the Basutoland lava plateau. Most of the dolerites show little differentiation but olivine rich types and acidic veins have been recorded. The magma had an effect on the sedimentary rocks; many of the rocks described as granophyre were found to be transformed siltstone. The dolerites occur as sills and dikes but "bell-jar inclusions" occur (the Bird's River complex is a bell jar shaped inclusion).Â </li> </ul> Eales, H.V., and Booth P.W.K., 1974, The Birds River Gabbro Complex, Dordrecht District, Transactions of the Geological Society of South Africa, v. 77, p. 1-15. <ul><li>On the gabbros of the Birds River Complex.</li> </ul> Rock A physical material with a mineral composition. Unit Formation or other descriptive rock category Lesotho Formation Number of Thin Sections Number of thin sections associated with this sample 1 Dublin Core The Dublin Core metadata element set is common to all Omeka records, including items, files, and collections. For more information see, http://dublincore.org/documents/dces/. Title A name given to the resource Dolerite Alternative Title An alternative name for the resource. The distinction between titles and alternative titles is application-specific. Diabase or Microgabbro Description An account of the resource This is dolerite from the "Dragon's Back" dyke, from the farm Romance. It is the youngest dolerite body in the area and contains biotite and hornblende. Emplacement of this dolerite took place at a much deeper crustal level than the gabbros. It has an aphanitic- porphyritic texture and is holocrystalline. The groundmass is light gray and subhedral. It contains slightly darker gray fine grained subhedral phenocrysts that comprise 30% of the dolerite. There is pinkish- brown blotchy weathering. The thin sections are shown in plain polarized light and cross polarized light at a magnification of 400x and contains 60% plagioclase, 35% pyroxenes, and 5% opaques. Abstract A summary of the resource. Differentiation of tholeiitic Karroo magma at Birds River, South Africa Date A point or period of time associated with an event in the lifecycle of the resource No date given. Contributor An entity responsible for making contributions to the resource Western Minerals, Inc. Is Part Of A related resource in which the described resource is physically or logically included. http://www.geosciencecollections.milne-library.org/collections/show/17 Identifier An unambiguous reference to the resource within a given context KBR-18 Spatial Coverage Spatial characteristics of the resource. Karoo- Birds River, Eastern Cape, South Africa Temporal Coverage Temporal characteristics of the resource. 183-179 Ma (Jurassic) Accrual Method The method by which items are added to a collection. Purchased from Western Minerals. Inc. https://dev.geosciencecollections.milne-library.org/files/original/0fb8836ed209cebe0ae1e8684317892a.JPG 97ffa4928fdd9153877aeb06dbd1fa8d Omeka Image File The metadata element set that was included in the `files_images` table in previous versions of Omeka. These elements are common to all image files. Width 1936 Height 2592 Bit Depth 8 Channels 3 Dublin Core The Dublin Core metadata element set is common to all Omeka records, including items, files, and collections. For more information see, http://dublincore.org/documents/dces/. Title A name given to the resource (KBR) Karroo Igneous Complex -- Birds River, South Africa Description An account of the resource The Birds River Complex is a "Bell-Jar" intrusion first described by du Toit in 1905 and then by Ealey and Robey in 1976. One of the best exposed sections across the margin of the complex is on the farm Denwood, in the southwestern corner of the complex. The samples were collected from a mafic intrusion near Denwood farm. These samples from the Karroo Complex were collected from the previously studied section of the complex and neighboring areas. Contributor An entity responsible for making contributions to the resource Dr. Brian Lock, Rhodes University Western Minerals, Inc. References A related resource that is referenced, cited, or otherwise pointed to by the described resource. Start Here: Cox, K.G., 1972, The Karroo Volcanic Cycle: Journal of the Geological Society, v. 128, p. 311-336.Â doi: 10.1144/gsjgs. 128.4.0311. <ul><li>The petrogenesis of the Mesozoic igneous rocks of south-Eastern Africa is related to the tectonic event believed to be the initiation of the break up of Gondwanaland. The cycle began with the rise of potassium-rich picritic magma, the source material for rocks of the northern province, Rhodesia. On top of and peripheral to the main magma body, a zone of sodic magma was generated and formed some of the rocks of the north and most southern rocks.</li> </ul> Additional resources: White, R.S., 1992, Magmatism During and After Continental Break-Up, Geological Society, London, Special Publications, v. 68, p. 1-16. doi:Â 10.1144/GSL.SP.1992.068.01.0. <ul><li>Magmatism that goes along with continental break-up is caused primarily by decompression melting of the underlying mantle as it rises up beneath the rift. The amount of melt produced is determined by the asthenospheric mantle temperature and on the rate of rifting.Â </li> </ul>Eales, H.V., and van Robey, J.A., 1976, Differentiation of Tholeiitic Karroo Magma at Birds River, South Africa, Contributions to Mineralogy and Petrology 10. v. 56, p. 101-117. doi:Â 10.1007/BF00375423 <ul><li>Strongly fractionated residue from the partial crystallization of tholeiitic gabbroic magma was emplaced at depth within sediment of the upper part of the Karroo succession. The residue was most likely tapped from a deeper intrusion during cauldron subsidence, but was engulfed by a later intrusion of olivine gabbro on a large scale.</li> </ul> Walker, F., and Poldervaart, A., 1949, Karroo Dolerites of the Union of South Africa, Geological Society of America Bulletin, v. 60, p. 591-706. doi: 10.1130/0016-7606(1949)60[591:KDOTUO]2.0.CO;2 <ul><li>The Karroo dolerites are the result of the intrusive phase of the early Jurassic basalts that built up the Basutoland lava plateau. Most of the dolerites show little differentiation but olivine rich types and acidic veins have been recorded. The magma had an effect on the sedimentary rocks; many of the rocks described as granophyre were found to be transformed siltstone. The dolerites occur as sills and dikes but "bell-jar inclusions" occur (the Bird's River complex is a bell jar shaped inclusion).Â </li> </ul> Eales, H.V., and Booth P.W.K., 1974, The Birds River Gabbro Complex, Dordrecht District, Transactions of the Geological Society of South Africa, v. 77, p. 1-15. <ul><li>On the gabbros of the Birds River Complex.</li> </ul> Rock A physical material with a mineral composition. Unit Formation or other descriptive rock category Lesotho Formation Number of Thin Sections Number of thin sections associated with this sample 1 Dublin Core The Dublin Core metadata element set is common to all Omeka records, including items, files, and collections. For more information see, http://dublincore.org/documents/dces/. Title A name given to the resource Volcanic Breccia Description An account of the resource This is a volcanic breccia from the farm Murrelfontein adjacent to the contact with the gabbro unit. It includes partially melted glass and tridymite, a high temperature polymorph of quartz, and has a brecciated appearance. The breccia has a allotriomorphic- granular texture and is holocrystalline. Coarse, anhedral, chaotic-looking dark black crystals (3-12mm) are surrounded by slightly lighter colored, smaller anhedral crystals (2 mm -6 mm). There are trace olivine phenocrysts (2 mm). Abstract A summary of the resource. <a href="http://link.springer.com/article/10.1007/BF00375423">Differentiation of tholeiitic Karroo magma at Birds River, South Africa</a> Date A point or period of time associated with an event in the lifecycle of the resource No date given. Contributor An entity responsible for making contributions to the resource Western Minerals, Inc. Is Part Of A related resource in which the described resource is physically or logically included. http://www.geosciencecollections.milne-library.org/collections/show/17 Identifier An unambiguous reference to the resource within a given context KBR-19 Spatial Coverage Spatial characteristics of the resource. Karoo- Birds River, Eastern Cape, South Africa Temporal Coverage Temporal characteristics of the resource. 183-179 Ma (Jurassic) Accrual Method The method by which items are added to a collection. Purchased from Western Minerals, Inc. https://dev.geosciencecollections.milne-library.org/files/original/d4c0efdef5825900fa26e707eba361a8.pdf 4d97c846f36035b1a4991394c95d2007 Dublin Core The Dublin Core metadata element set is common to all Omeka records, including items, files, and collections. For more information see, http://dublincore.org/documents/dces/. Title A name given to the resource (KBR) Karroo Igneous Complex -- Birds River, South Africa Description An account of the resource The Birds River Complex is a "Bell-Jar" intrusion first described by du Toit in 1905 and then by Ealey and Robey in 1976. One of the best exposed sections across the margin of the complex is on the farm Denwood, in the southwestern corner of the complex. The samples were collected from a mafic intrusion near Denwood farm. These samples from the Karroo Complex were collected from the previously studied section of the complex and neighboring areas. Contributor An entity responsible for making contributions to the resource Dr. Brian Lock, Rhodes University Western Minerals, Inc. References A related resource that is referenced, cited, or otherwise pointed to by the described resource. Start Here: Cox, K.G., 1972, The Karroo Volcanic Cycle: Journal of the Geological Society, v. 128, p. 311-336.Â doi: 10.1144/gsjgs. 128.4.0311. <ul><li>The petrogenesis of the Mesozoic igneous rocks of south-Eastern Africa is related to the tectonic event believed to be the initiation of the break up of Gondwanaland. The cycle began with the rise of potassium-rich picritic magma, the source material for rocks of the northern province, Rhodesia. On top of and peripheral to the main magma body, a zone of sodic magma was generated and formed some of the rocks of the north and most southern rocks.</li> </ul> Additional resources: White, R.S., 1992, Magmatism During and After Continental Break-Up, Geological Society, London, Special Publications, v. 68, p. 1-16. doi:Â 10.1144/GSL.SP.1992.068.01.0. <ul><li>Magmatism that goes along with continental break-up is caused primarily by decompression melting of the underlying mantle as it rises up beneath the rift. The amount of melt produced is determined by the asthenospheric mantle temperature and on the rate of rifting.Â </li> </ul>Eales, H.V., and van Robey, J.A., 1976, Differentiation of Tholeiitic Karroo Magma at Birds River, South Africa, Contributions to Mineralogy and Petrology 10. v. 56, p. 101-117. doi:Â 10.1007/BF00375423 <ul><li>Strongly fractionated residue from the partial crystallization of tholeiitic gabbroic magma was emplaced at depth within sediment of the upper part of the Karroo succession. The residue was most likely tapped from a deeper intrusion during cauldron subsidence, but was engulfed by a later intrusion of olivine gabbro on a large scale.</li> </ul> Walker, F., and Poldervaart, A., 1949, Karroo Dolerites of the Union of South Africa, Geological Society of America Bulletin, v. 60, p. 591-706. doi: 10.1130/0016-7606(1949)60[591:KDOTUO]2.0.CO;2 <ul><li>The Karroo dolerites are the result of the intrusive phase of the early Jurassic basalts that built up the Basutoland lava plateau. Most of the dolerites show little differentiation but olivine rich types and acidic veins have been recorded. The magma had an effect on the sedimentary rocks; many of the rocks described as granophyre were found to be transformed siltstone. The dolerites occur as sills and dikes but "bell-jar inclusions" occur (the Bird's River complex is a bell jar shaped inclusion).Â </li> </ul> Eales, H.V., and Booth P.W.K., 1974, The Birds River Gabbro Complex, Dordrecht District, Transactions of the Geological Society of South Africa, v. 77, p. 1-15. <ul><li>On the gabbros of the Birds River Complex.</li> </ul> Rock A physical material with a mineral composition. Dublin Core The Dublin Core metadata element set is common to all Omeka records, including items, files, and collections. For more information see, http://dublincore.org/documents/dces/. Title A name given to the resource Karroo- Birds River, Western Minerals Supplementary Information Description An account of the resource OCR PDF of supplemental information for Karroo- Bird's River Petrographic Suite Publisher An entity responsible for making the resource available Western Minerals, inc Has Part A related resource that is included either physically or logically in the described resource. Karroo- Birds River Petrographic Suite Format The file format, physical medium, or dimensions of the resource PDF Identifier An unambiguous reference to the resource within a given context KBR- Suite Spatial Coverage Spatial characteristics of the resource. Karroo- Birds River, South Africa Temporal Coverage Temporal characteristics of the resource. 183-179 Ma Jurassic Age https://dev.geosciencecollections.milne-library.org/files/original/14a8f3576af5534d8240a42d938cfb78.jpg 2017f4450bc3e1dd56e3f4b83a4ea2c2 Omeka Image File The metadata element set that was included in the `files_images` table in previous versions of Omeka. These elements are common to all image files. Width 3260 Height 2182 Bit Depth 8 Channels 3 IPTC String date_created:05.10.2013 IPTC Array a:1:{s:12:"date_created";s:10:"05.10.2013";} https://dev.geosciencecollections.milne-library.org/files/original/ae176f29d14d1adf5fdfa2837527bf03.jpg a2c9772cb2f2f83f58ac81591751d3af Omeka Image File The metadata element set that was included in the `files_images` table in previous versions of Omeka. These elements are common to all image files. Width 3264 Height 2185 Bit Depth 8 Channels 3 IPTC String date_created:05.10.2013 IPTC Array a:1:{s:12:"date_created";s:10:"05.10.2013";} https://dev.geosciencecollections.milne-library.org/files/original/daa90510d585d75fff1616adf6a090a0.jpg cf7a82373cfe0e3f28f20fcc6439d651 Omeka Image File The metadata element set that was included in the `files_images` table in previous versions of Omeka. These elements are common to all image files. Width 3249 Height 2175 Bit Depth 8 Channels 3 IPTC String date_created:05.10.2013 IPTC Array a:1:{s:12:"date_created";s:10:"05.10.2013";} https://dev.geosciencecollections.milne-library.org/files/original/e3efa5a2841bde88e621554c0586baa6.JPG 1746d0be4ffdab1866c8732c9c94a085 Omeka Image File The metadata element set that was included in the `files_images` table in previous versions of Omeka. These elements are common to all image files. Width 2560 Height 1920 Bit Depth 8 Channels 3 https://dev.geosciencecollections.milne-library.org/files/original/0d53568b450846f757550f01533c1ed7.JPG a12008d4a6c92a90b7462b06ec75939d Omeka Image File The metadata element set that was included in the `files_images` table in previous versions of Omeka. These elements are common to all image files. Width 2560 Height 1920 Bit Depth 8 Channels 3 Dublin Core The Dublin Core metadata element set is common to all Omeka records, including items, files, and collections. For more information see, http://dublincore.org/documents/dces/. Title A name given to the resource (FR) Sedimentary and Igneous Franciscan Assemblage Suite -- California Description An account of the resource This 14 sample collection primarily consists of clastic sedimentary rocks with metamorphic and igneous components, representing a Franciscan Assemblage. This assemblage is indicative of a subduction zone along the California coast. Contributor An entity responsible for making contributions to the resource Western Minerals, Inc. - Collection was supervised by Dr. Frederick C. Marshall, Assistant Professor of Geology at Principia College. References A related resource that is referenced, cited, or otherwise pointed to by the described resource. Start here: Ernst, W.G., 2015, Franciscan geologic history constrained by tectonic/olistostromal high-grade metamafic blocks in the iconic California Mesozoic-Cenozoic accretionary complex: American Mineralogist, v. 100, p. 6-13.Â <a href="http://dx.doi.org/10.2138/am-2015-4850" target="_blank">doi:Â 10.2138/am-2015-4850</a> <ul><li>This source supplies useful information on the low temperature, high pressure environment in which these rocks formed.Â </li> </ul>Additional resources: Barnes, J., Eldam, R., Lee, C.T., Errico, J., Loewy, S., and Cisneros, M., 2013, Petrogenesis of serpentinites from the Franciscan Complex, western California, USA: Lithos, v. 178, p. 143-157.Â <a class="S_C_ddDoi" href="http://dx.doi.org/10.1016/j.lithos.2012.12.018" target="_blank">doi:10.1016/j.lithos.2012.12.018</a> <ul><li>Describes the petrogenesis of serpentine as seen in one of the items in the collection (Fr-4).</li> </ul>Cooper, F., Platt, J., and Anczkiewicz, R., 2011, Constraints on early Franciscan subduction rates from 2-D thermal modeling: Earth and Planetary Science Letters, v. 312, p. 69-79. doi:<a href="http://dx.doi.org/10.1016/j.epsl.2011.09.051">10.1016/j.epsl.2011.09.051</a> <ul><li>This paper suggests that the rate of subduction in this area may have been five times lower than previous studies have found.</li> </ul>Ghatak, A., Basu, A., and Wakabayashi, J., 2013, Implications of Franciscan Complex graywacke geochemistry for sediment transport, provenance determination, burial-exposure duration, and fluid exchange with cosubducted metabasites: Tectonics, v. 32, p. 1480-1492. doi:Â <a href="http://dx.doi.org/10.1002/tect.20078">10.1002/tect.20078</a> <ul><li>This article states that the europium anomalies of the greywacke samples suggest provenance from the Sierra Nevada batholith.</li> </ul>Langenheim, V., Jachens, R., Wentworth, C., and McLaughlin, R., 2013, Previously unrecognized regional structure of the Coastal Belt of the Franciscan Complex, northern California, revealed by magnetic data: Geosphere, v. 9, p. 1514-1529. doi:Â <a href="http://dx.doi.org/10.1130/GES00942.1">10.1130/GES00942.1</a> <ul><li>Using magnetic data, this article provides an overview of the regional structure of the Franciscan Complex.</li> </ul> Spatial Coverage Spatial characteristics of the resource. These specimens were collected across Marin County and the San Francisco Peninsula. Temporal Coverage Temporal characteristics of the resource. The specimens are Mesozoic in age. Rock A physical material with a mineral composition. Number of Thin Sections Number of thin sections associated with this sample 1 Dublin Core The Dublin Core metadata element set is common to all Omeka records, including items, files, and collections. For more information see, http://dublincore.org/documents/dces/. Title A name given to the resource Arkosic Graywacke Alternative Title An alternative name for the resource. The distinction between titles and alternative titles is application-specific. Sandstone Description An account of the resource Grain sizes sand to silty sand, rounded and angular with very minor examples of weathering and thin quartz vein present. Collected from the same quarry as FR-2. (FOV: 1.28mm) Date A point or period of time associated with an event in the lifecycle of the resource Not given Contributor An entity responsible for making contributions to the resource Western Minerals, Inc. Is Part Of A related resource in which the described resource is physically or logically included. <a href="http://www.geosciencecollections.milne-library.org/collections/show/12">Stratigraphic Suite- Franciscan Rocks, California</a> Identifier An unambiguous reference to the resource within a given context FR-1 Spatial Coverage Spatial characteristics of the resource. Unsurveyed portion of T 3 S, R 5 W near Brisbane. CPA company quarry 4100 ft. east from "Peak 1314" in the San Bruno mountains. Temporal Coverage Temporal characteristics of the resource. Mesozoic Accrual Method The method by which items are added to a collection. 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Width 2560 Height 1920 Bit Depth 8 Channels 3 https://dev.geosciencecollections.milne-library.org/files/original/bb5d0570651a8fcf1ce3212537e33d34.JPG b83c0903570d09310f4a5c78287fc0e4 Omeka Image File The metadata element set that was included in the `files_images` table in previous versions of Omeka. These elements are common to all image files. Width 2560 Height 1920 Bit Depth 8 Channels 3 Dublin Core The Dublin Core metadata element set is common to all Omeka records, including items, files, and collections. For more information see, http://dublincore.org/documents/dces/. Title A name given to the resource (FR) Sedimentary and Igneous Franciscan Assemblage Suite -- California Description An account of the resource This 14 sample collection primarily consists of clastic sedimentary rocks with metamorphic and igneous components, representing a Franciscan Assemblage. This assemblage is indicative of a subduction zone along the California coast. Contributor An entity responsible for making contributions to the resource Western Minerals, Inc. - Collection was supervised by Dr. Frederick C. Marshall, Assistant Professor of Geology at Principia College. References A related resource that is referenced, cited, or otherwise pointed to by the described resource. Start here: Ernst, W.G., 2015, Franciscan geologic history constrained by tectonic/olistostromal high-grade metamafic blocks in the iconic California Mesozoic-Cenozoic accretionary complex: American Mineralogist, v. 100, p. 6-13.Â <a href="http://dx.doi.org/10.2138/am-2015-4850" target="_blank">doi:Â 10.2138/am-2015-4850</a> <ul><li>This source supplies useful information on the low temperature, high pressure environment in which these rocks formed.Â </li> </ul>Additional resources: Barnes, J., Eldam, R., Lee, C.T., Errico, J., Loewy, S., and Cisneros, M., 2013, Petrogenesis of serpentinites from the Franciscan Complex, western California, USA: Lithos, v. 178, p. 143-157.Â <a class="S_C_ddDoi" href="http://dx.doi.org/10.1016/j.lithos.2012.12.018" target="_blank">doi:10.1016/j.lithos.2012.12.018</a> <ul><li>Describes the petrogenesis of serpentine as seen in one of the items in the collection (Fr-4).</li> </ul>Cooper, F., Platt, J., and Anczkiewicz, R., 2011, Constraints on early Franciscan subduction rates from 2-D thermal modeling: Earth and Planetary Science Letters, v. 312, p. 69-79. doi:<a href="http://dx.doi.org/10.1016/j.epsl.2011.09.051">10.1016/j.epsl.2011.09.051</a> <ul><li>This paper suggests that the rate of subduction in this area may have been five times lower than previous studies have found.</li> </ul>Ghatak, A., Basu, A., and Wakabayashi, J., 2013, Implications of Franciscan Complex graywacke geochemistry for sediment transport, provenance determination, burial-exposure duration, and fluid exchange with cosubducted metabasites: Tectonics, v. 32, p. 1480-1492. doi:Â <a href="http://dx.doi.org/10.1002/tect.20078">10.1002/tect.20078</a> <ul><li>This article states that the europium anomalies of the greywacke samples suggest provenance from the Sierra Nevada batholith.</li> </ul>Langenheim, V., Jachens, R., Wentworth, C., and McLaughlin, R., 2013, Previously unrecognized regional structure of the Coastal Belt of the Franciscan Complex, northern California, revealed by magnetic data: Geosphere, v. 9, p. 1514-1529. doi:Â <a href="http://dx.doi.org/10.1130/GES00942.1">10.1130/GES00942.1</a> <ul><li>Using magnetic data, this article provides an overview of the regional structure of the Franciscan Complex.</li> </ul> Spatial Coverage Spatial characteristics of the resource. These specimens were collected across Marin County and the San Francisco Peninsula. Temporal Coverage Temporal characteristics of the resource. The specimens are Mesozoic in age. Rock A physical material with a mineral composition. Number of Thin Sections Number of thin sections associated with this sample 1 Dublin Core The Dublin Core metadata element set is common to all Omeka records, including items, files, and collections. For more information see, http://dublincore.org/documents/dces/. Title A name given to the resource Arkosic Graywacke Alternative Title An alternative name for the resource. The distinction between titles and alternative titles is application-specific. Sandstone Description An account of the resource Grain size is fine sand to silty sand, mostly angular with some rounded crystals. Various shades of surficial weathering with distinct pockets of orange-brown oxydation. Fresh surfaces brown-green in color. Collected from same quarry as sample FR-1. (Thin Section FOV: 1.28mm) Date A point or period of time associated with an event in the lifecycle of the resource Not given Contributor An entity responsible for making contributions to the resource Western Minerals, Inc. Is Part Of A related resource in which the described resource is physically or logically included. <a href="http://www.geosciencecollections.milne-library.org/collections/show/12">Stratigraphic Suite- Franciscan Rocks, California</a> Identifier An unambiguous reference to the resource within a given context FR-2 Spatial Coverage Spatial characteristics of the resource. Collected from another part of the same quarry as specimen FR-1. Temporal Coverage Temporal characteristics of the resource. Mesozoic Accrual Method The method by which items are added to a collection. 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Title A name given to the resource (FR) Sedimentary and Igneous Franciscan Assemblage Suite -- California Description An account of the resource This 14 sample collection primarily consists of clastic sedimentary rocks with metamorphic and igneous components, representing a Franciscan Assemblage. This assemblage is indicative of a subduction zone along the California coast. Contributor An entity responsible for making contributions to the resource Western Minerals, Inc. - Collection was supervised by Dr. Frederick C. Marshall, Assistant Professor of Geology at Principia College. References A related resource that is referenced, cited, or otherwise pointed to by the described resource. Start here: Ernst, W.G., 2015, Franciscan geologic history constrained by tectonic/olistostromal high-grade metamafic blocks in the iconic California Mesozoic-Cenozoic accretionary complex: American Mineralogist, v. 100, p. 6-13.Â <a href="http://dx.doi.org/10.2138/am-2015-4850" target="_blank">doi:Â 10.2138/am-2015-4850</a> <ul><li>This source supplies useful information on the low temperature, high pressure environment in which these rocks formed.Â </li> </ul>Additional resources: Barnes, J., Eldam, R., Lee, C.T., Errico, J., Loewy, S., and Cisneros, M., 2013, Petrogenesis of serpentinites from the Franciscan Complex, western California, USA: Lithos, v. 178, p. 143-157.Â <a class="S_C_ddDoi" href="http://dx.doi.org/10.1016/j.lithos.2012.12.018" target="_blank">doi:10.1016/j.lithos.2012.12.018</a> <ul><li>Describes the petrogenesis of serpentine as seen in one of the items in the collection (Fr-4).</li> </ul>Cooper, F., Platt, J., and Anczkiewicz, R., 2011, Constraints on early Franciscan subduction rates from 2-D thermal modeling: Earth and Planetary Science Letters, v. 312, p. 69-79. doi:<a href="http://dx.doi.org/10.1016/j.epsl.2011.09.051">10.1016/j.epsl.2011.09.051</a> <ul><li>This paper suggests that the rate of subduction in this area may have been five times lower than previous studies have found.</li> </ul>Ghatak, A., Basu, A., and Wakabayashi, J., 2013, Implications of Franciscan Complex graywacke geochemistry for sediment transport, provenance determination, burial-exposure duration, and fluid exchange with cosubducted metabasites: Tectonics, v. 32, p. 1480-1492. doi:Â <a href="http://dx.doi.org/10.1002/tect.20078">10.1002/tect.20078</a> <ul><li>This article states that the europium anomalies of the greywacke samples suggest provenance from the Sierra Nevada batholith.</li> </ul>Langenheim, V., Jachens, R., Wentworth, C., and McLaughlin, R., 2013, Previously unrecognized regional structure of the Coastal Belt of the Franciscan Complex, northern California, revealed by magnetic data: Geosphere, v. 9, p. 1514-1529. doi:Â <a href="http://dx.doi.org/10.1130/GES00942.1">10.1130/GES00942.1</a> <ul><li>Using magnetic data, this article provides an overview of the regional structure of the Franciscan Complex.</li> </ul> Spatial Coverage Spatial characteristics of the resource. These specimens were collected across Marin County and the San Francisco Peninsula. Temporal Coverage Temporal characteristics of the resource. The specimens are Mesozoic in age. Rock A physical material with a mineral composition. Number of Thin Sections Number of thin sections associated with this sample 1 Dublin Core The Dublin Core metadata element set is common to all Omeka records, including items, files, and collections. For more information see, http://dublincore.org/documents/dces/. Title A name given to the resource Red Chert Alternative Title An alternative name for the resource. The distinction between titles and alternative titles is application-specific. Jasper Description An account of the resource Red jasper matrix with interescting veins of while quartz. Prominent physcial weathering, brittle areas fall apart to the touch. Several prominent fractures run through the rock, contributing to the weakened structure. Most fresh surfaces are reddish brown while weathered surfaces are brown to orange. (FOV: 0.64mm) Date A point or period of time associated with an event in the lifecycle of the resource Not given Contributor An entity responsible for making contributions to the resource Western Minerals, Inc. Is Part Of A related resource in which the described resource is physically or logically included. <a href="http://www.geosciencecollections.milne-library.org/collections/show/12">Stratigraphic Suite- Franciscan Rocks, California</a> Identifier An unambiguous reference to the resource within a given context FR-3 Spatial Coverage Spatial characteristics of the resource. Roadcut on northwest side of Sausalito road east of US 101 and just north of Golden Gate Bridge. It is the first outcrop northeast of the Fort Barry Road Temporal Coverage Temporal characteristics of the resource. N/A Accrual Method The method by which items are added to a collection. 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Title A name given to the resource (FR) Sedimentary and Igneous Franciscan Assemblage Suite -- California Description An account of the resource This 14 sample collection primarily consists of clastic sedimentary rocks with metamorphic and igneous components, representing a Franciscan Assemblage. This assemblage is indicative of a subduction zone along the California coast. Contributor An entity responsible for making contributions to the resource Western Minerals, Inc. - Collection was supervised by Dr. Frederick C. Marshall, Assistant Professor of Geology at Principia College. References A related resource that is referenced, cited, or otherwise pointed to by the described resource. Start here: Ernst, W.G., 2015, Franciscan geologic history constrained by tectonic/olistostromal high-grade metamafic blocks in the iconic California Mesozoic-Cenozoic accretionary complex: American Mineralogist, v. 100, p. 6-13.Â <a href="http://dx.doi.org/10.2138/am-2015-4850" target="_blank">doi:Â 10.2138/am-2015-4850</a> <ul><li>This source supplies useful information on the low temperature, high pressure environment in which these rocks formed.Â </li> </ul>Additional resources: Barnes, J., Eldam, R., Lee, C.T., Errico, J., Loewy, S., and Cisneros, M., 2013, Petrogenesis of serpentinites from the Franciscan Complex, western California, USA: Lithos, v. 178, p. 143-157.Â <a class="S_C_ddDoi" href="http://dx.doi.org/10.1016/j.lithos.2012.12.018" target="_blank">doi:10.1016/j.lithos.2012.12.018</a> <ul><li>Describes the petrogenesis of serpentine as seen in one of the items in the collection (Fr-4).</li> </ul>Cooper, F., Platt, J., and Anczkiewicz, R., 2011, Constraints on early Franciscan subduction rates from 2-D thermal modeling: Earth and Planetary Science Letters, v. 312, p. 69-79. doi:<a href="http://dx.doi.org/10.1016/j.epsl.2011.09.051">10.1016/j.epsl.2011.09.051</a> <ul><li>This paper suggests that the rate of subduction in this area may have been five times lower than previous studies have found.</li> </ul>Ghatak, A., Basu, A., and Wakabayashi, J., 2013, Implications of Franciscan Complex graywacke geochemistry for sediment transport, provenance determination, burial-exposure duration, and fluid exchange with cosubducted metabasites: Tectonics, v. 32, p. 1480-1492. doi:Â <a href="http://dx.doi.org/10.1002/tect.20078">10.1002/tect.20078</a> <ul><li>This article states that the europium anomalies of the greywacke samples suggest provenance from the Sierra Nevada batholith.</li> </ul>Langenheim, V., Jachens, R., Wentworth, C., and McLaughlin, R., 2013, Previously unrecognized regional structure of the Coastal Belt of the Franciscan Complex, northern California, revealed by magnetic data: Geosphere, v. 9, p. 1514-1529. doi:Â <a href="http://dx.doi.org/10.1130/GES00942.1">10.1130/GES00942.1</a> <ul><li>Using magnetic data, this article provides an overview of the regional structure of the Franciscan Complex.</li> </ul> Spatial Coverage Spatial characteristics of the resource. These specimens were collected across Marin County and the San Francisco Peninsula. Temporal Coverage Temporal characteristics of the resource. The specimens are Mesozoic in age. Rock A physical material with a mineral composition. Number of Thin Sections Number of thin sections associated with this sample 1 Dublin Core The Dublin Core metadata element set is common to all Omeka records, including items, files, and collections. For more information see, http://dublincore.org/documents/dces/. Title A name given to the resource Serpentine Description An account of the resource Fresh surfaces are dark blue in color, while weathered surfaces range in shades of green. Asbestos veins intersect throughout the rock, making up ~5% of the crystal mass. (FOV: 1.28) Date A point or period of time associated with an event in the lifecycle of the resource Not given Contributor An entity responsible for making contributions to the resource Western Minerals, Inc. 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Contributor An entity responsible for making contributions to the resource Western Minerals, Inc. - Collection was supervised by Dr. Frederick C. Marshall, Assistant Professor of Geology at Principia College. References A related resource that is referenced, cited, or otherwise pointed to by the described resource. Start here: Ernst, W.G., 2015, Franciscan geologic history constrained by tectonic/olistostromal high-grade metamafic blocks in the iconic California Mesozoic-Cenozoic accretionary complex: American Mineralogist, v. 100, p. 6-13.Â <a href="http://dx.doi.org/10.2138/am-2015-4850" target="_blank">doi:Â 10.2138/am-2015-4850</a> <ul><li>This source supplies useful information on the low temperature, high pressure environment in which these rocks formed.Â </li> </ul>Additional resources: Barnes, J., Eldam, R., Lee, C.T., Errico, J., Loewy, S., and Cisneros, M., 2013, Petrogenesis of serpentinites from the Franciscan Complex, western California, USA: Lithos, v. 178, p. 143-157.Â <a class="S_C_ddDoi" href="http://dx.doi.org/10.1016/j.lithos.2012.12.018" target="_blank">doi:10.1016/j.lithos.2012.12.018</a> <ul><li>Describes the petrogenesis of serpentine as seen in one of the items in the collection (Fr-4).</li> </ul>Cooper, F., Platt, J., and Anczkiewicz, R., 2011, Constraints on early Franciscan subduction rates from 2-D thermal modeling: Earth and Planetary Science Letters, v. 312, p. 69-79. doi:<a href="http://dx.doi.org/10.1016/j.epsl.2011.09.051">10.1016/j.epsl.2011.09.051</a> <ul><li>This paper suggests that the rate of subduction in this area may have been five times lower than previous studies have found.</li> </ul>Ghatak, A., Basu, A., and Wakabayashi, J., 2013, Implications of Franciscan Complex graywacke geochemistry for sediment transport, provenance determination, burial-exposure duration, and fluid exchange with cosubducted metabasites: Tectonics, v. 32, p. 1480-1492. doi:Â <a href="http://dx.doi.org/10.1002/tect.20078">10.1002/tect.20078</a> <ul><li>This article states that the europium anomalies of the greywacke samples suggest provenance from the Sierra Nevada batholith.</li> </ul>Langenheim, V., Jachens, R., Wentworth, C., and McLaughlin, R., 2013, Previously unrecognized regional structure of the Coastal Belt of the Franciscan Complex, northern California, revealed by magnetic data: Geosphere, v. 9, p. 1514-1529. doi:Â <a href="http://dx.doi.org/10.1130/GES00942.1">10.1130/GES00942.1</a> <ul><li>Using magnetic data, this article provides an overview of the regional structure of the Franciscan Complex.</li> </ul> Spatial Coverage Spatial characteristics of the resource. These specimens were collected across Marin County and the San Francisco Peninsula. Temporal Coverage Temporal characteristics of the resource. The specimens are Mesozoic in age. Rock A physical material with a mineral composition. Number of Thin Sections Number of thin sections associated with this sample 1 Dublin Core The Dublin Core metadata element set is common to all Omeka records, including items, files, and collections. For more information see, http://dublincore.org/documents/dces/. Title A name given to the resource Graywacke Siltstone Description An account of the resource Angular, silty size gains, composed of equal parts quatz, feldspars and rock fragments. Prominent orange and brown surface oxydation on all samples. Some samples contain evidence of bedding planes. Calicte is found along bedding planes, as well as on some surfaces perpendicular to bedding. Some samples include very fine calcite veins (<0.5mm) intersecting through the bedding planes. (FOV: 1.28) Date A point or period of time associated with an event in the lifecycle of the resource Not given Contributor An entity responsible for making contributions to the resource Western Minerals, Inc. Is Part Of A related resource in which the described resource is physically or logically included. <a href="http://www.geosciencecollections.milne-library.org/collections/show/12">Stratigraphic Suite- Franciscan Rocks, California</a> Identifier An unambiguous reference to the resource within a given context FR-5 Spatial Coverage Spatial characteristics of the resource. Roadcut on south side of Petaluma Pt. Reyes Station road 1/2 mi. upstream (east) from dam which is about 4 miles east of Point Reyes Station. Temporal Coverage Temporal characteristics of the resource. Mesozoic Accrual Method The method by which items are added to a collection. 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Width 2560 Height 1920 Bit Depth 8 Channels 3 https://dev.geosciencecollections.milne-library.org/files/original/8691bee8bce4c8dc4bde86181789a81b.JPG 50bb8056fdc8880c1ad5090492ace578 Omeka Image File The metadata element set that was included in the `files_images` table in previous versions of Omeka. These elements are common to all image files. Width 2560 Height 1920 Bit Depth 8 Channels 3 Dublin Core The Dublin Core metadata element set is common to all Omeka records, including items, files, and collections. For more information see, http://dublincore.org/documents/dces/. Title A name given to the resource (FR) Sedimentary and Igneous Franciscan Assemblage Suite -- California Description An account of the resource This 14 sample collection primarily consists of clastic sedimentary rocks with metamorphic and igneous components, representing a Franciscan Assemblage. This assemblage is indicative of a subduction zone along the California coast. Contributor An entity responsible for making contributions to the resource Western Minerals, Inc. - Collection was supervised by Dr. Frederick C. Marshall, Assistant Professor of Geology at Principia College. References A related resource that is referenced, cited, or otherwise pointed to by the described resource. Start here: Ernst, W.G., 2015, Franciscan geologic history constrained by tectonic/olistostromal high-grade metamafic blocks in the iconic California Mesozoic-Cenozoic accretionary complex: American Mineralogist, v. 100, p. 6-13.Â <a href="http://dx.doi.org/10.2138/am-2015-4850" target="_blank">doi:Â 10.2138/am-2015-4850</a> <ul><li>This source supplies useful information on the low temperature, high pressure environment in which these rocks formed.Â </li> </ul>Additional resources: Barnes, J., Eldam, R., Lee, C.T., Errico, J., Loewy, S., and Cisneros, M., 2013, Petrogenesis of serpentinites from the Franciscan Complex, western California, USA: Lithos, v. 178, p. 143-157.Â <a class="S_C_ddDoi" href="http://dx.doi.org/10.1016/j.lithos.2012.12.018" target="_blank">doi:10.1016/j.lithos.2012.12.018</a> <ul><li>Describes the petrogenesis of serpentine as seen in one of the items in the collection (Fr-4).</li> </ul>Cooper, F., Platt, J., and Anczkiewicz, R., 2011, Constraints on early Franciscan subduction rates from 2-D thermal modeling: Earth and Planetary Science Letters, v. 312, p. 69-79. doi:<a href="http://dx.doi.org/10.1016/j.epsl.2011.09.051">10.1016/j.epsl.2011.09.051</a> <ul><li>This paper suggests that the rate of subduction in this area may have been five times lower than previous studies have found.</li> </ul>Ghatak, A., Basu, A., and Wakabayashi, J., 2013, Implications of Franciscan Complex graywacke geochemistry for sediment transport, provenance determination, burial-exposure duration, and fluid exchange with cosubducted metabasites: Tectonics, v. 32, p. 1480-1492. doi:Â <a href="http://dx.doi.org/10.1002/tect.20078">10.1002/tect.20078</a> <ul><li>This article states that the europium anomalies of the greywacke samples suggest provenance from the Sierra Nevada batholith.</li> </ul>Langenheim, V., Jachens, R., Wentworth, C., and McLaughlin, R., 2013, Previously unrecognized regional structure of the Coastal Belt of the Franciscan Complex, northern California, revealed by magnetic data: Geosphere, v. 9, p. 1514-1529. doi:Â <a href="http://dx.doi.org/10.1130/GES00942.1">10.1130/GES00942.1</a> <ul><li>Using magnetic data, this article provides an overview of the regional structure of the Franciscan Complex.</li> </ul> Spatial Coverage Spatial characteristics of the resource. These specimens were collected across Marin County and the San Francisco Peninsula. Temporal Coverage Temporal characteristics of the resource. The specimens are Mesozoic in age. Rock A physical material with a mineral composition. Number of Thin Sections Number of thin sections associated with this sample 1 Dublin Core The Dublin Core metadata element set is common to all Omeka records, including items, files, and collections. For more information see, http://dublincore.org/documents/dces/. Title A name given to the resource Diabase Description An account of the resource Holocrystalline, medium grained, anhedral, ophitic, dibastic crystals. Low silica percentage (46.3%) for a Diabase, bordering on ultramafic compostion. Calcite is present on weathered surfaces, but not on fresh surfaces. (FOV: 3.2mm) Date A point or period of time associated with an event in the lifecycle of the resource Not given Contributor An entity responsible for making contributions to the resource Western Minerals, Inc. Is Part Of A related resource in which the described resource is physically or logically included. <a href="http://www.geosciencecollections.milne-library.org/collections/show/12">Stratigraphic Suite- Franciscan Rocks, California</a> Identifier An unambiguous reference to the resource within a given context FR-6 Spatial Coverage Spatial characteristics of the resource. Same as FR-5. Temporal Coverage Temporal characteristics of the resource. Mesozoic Accrual Method The method by which items are added to a collection. 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Title A name given to the resource (FR) Sedimentary and Igneous Franciscan Assemblage Suite -- California Description An account of the resource This 14 sample collection primarily consists of clastic sedimentary rocks with metamorphic and igneous components, representing a Franciscan Assemblage. This assemblage is indicative of a subduction zone along the California coast. Contributor An entity responsible for making contributions to the resource Western Minerals, Inc. - Collection was supervised by Dr. Frederick C. Marshall, Assistant Professor of Geology at Principia College. References A related resource that is referenced, cited, or otherwise pointed to by the described resource. Start here: Ernst, W.G., 2015, Franciscan geologic history constrained by tectonic/olistostromal high-grade metamafic blocks in the iconic California Mesozoic-Cenozoic accretionary complex: American Mineralogist, v. 100, p. 6-13.Â <a href="http://dx.doi.org/10.2138/am-2015-4850" target="_blank">doi:Â 10.2138/am-2015-4850</a> <ul><li>This source supplies useful information on the low temperature, high pressure environment in which these rocks formed.Â </li> </ul>Additional resources: Barnes, J., Eldam, R., Lee, C.T., Errico, J., Loewy, S., and Cisneros, M., 2013, Petrogenesis of serpentinites from the Franciscan Complex, western California, USA: Lithos, v. 178, p. 143-157.Â <a class="S_C_ddDoi" href="http://dx.doi.org/10.1016/j.lithos.2012.12.018" target="_blank">doi:10.1016/j.lithos.2012.12.018</a> <ul><li>Describes the petrogenesis of serpentine as seen in one of the items in the collection (Fr-4).</li> </ul>Cooper, F., Platt, J., and Anczkiewicz, R., 2011, Constraints on early Franciscan subduction rates from 2-D thermal modeling: Earth and Planetary Science Letters, v. 312, p. 69-79. doi:<a href="http://dx.doi.org/10.1016/j.epsl.2011.09.051">10.1016/j.epsl.2011.09.051</a> <ul><li>This paper suggests that the rate of subduction in this area may have been five times lower than previous studies have found.</li> </ul>Ghatak, A., Basu, A., and Wakabayashi, J., 2013, Implications of Franciscan Complex graywacke geochemistry for sediment transport, provenance determination, burial-exposure duration, and fluid exchange with cosubducted metabasites: Tectonics, v. 32, p. 1480-1492. doi:Â <a href="http://dx.doi.org/10.1002/tect.20078">10.1002/tect.20078</a> <ul><li>This article states that the europium anomalies of the greywacke samples suggest provenance from the Sierra Nevada batholith.</li> </ul>Langenheim, V., Jachens, R., Wentworth, C., and McLaughlin, R., 2013, Previously unrecognized regional structure of the Coastal Belt of the Franciscan Complex, northern California, revealed by magnetic data: Geosphere, v. 9, p. 1514-1529. doi:Â <a href="http://dx.doi.org/10.1130/GES00942.1">10.1130/GES00942.1</a> <ul><li>Using magnetic data, this article provides an overview of the regional structure of the Franciscan Complex.</li> </ul> Spatial Coverage Spatial characteristics of the resource. These specimens were collected across Marin County and the San Francisco Peninsula. Temporal Coverage Temporal characteristics of the resource. The specimens are Mesozoic in age. Rock A physical material with a mineral composition. Number of Thin Sections Number of thin sections associated with this sample 1 Dublin Core The Dublin Core metadata element set is common to all Omeka records, including items, files, and collections. For more information see, http://dublincore.org/documents/dces/. Title A name given to the resource Graywacke Alternative Title An alternative name for the resource. The distinction between titles and alternative titles is application-specific. Sandstone Description An account of the resource Angular sand size grains, dominated by quartz, have a brown color with a greenish tint. Calcite found on weathered bedding planes after lithification. Slight folding of the bedding planes in one direction. (FOV: 1.28) Date A point or period of time associated with an event in the lifecycle of the resource Not given Contributor An entity responsible for making contributions to the resource Western Minerals, Inc. Is Part Of A related resource in which the described resource is physically or logically included. <a href="http://www.geosciencecollections.milne-library.org/collections/show/12">Stratigraphic Suite- Franciscan Rocks, California</a> Identifier An unambiguous reference to the resource within a given context FR-7 Spatial Coverage Spatial characteristics of the resource. From summit of pass (White's Hill) just east of Forest Knolls on Sir Francis Drake Highway, Temporal Coverage Temporal characteristics of the resource. Mesozoic Accrual Method The method by which items are added to a collection. 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Width 3271 Height 2190 Bit Depth 8 Channels 3 IPTC String date_created:05.10.2013 IPTC Array a:1:{s:12:"date_created";s:10:"05.10.2013";} Dublin Core The Dublin Core metadata element set is common to all Omeka records, including items, files, and collections. For more information see, http://dublincore.org/documents/dces/. Title A name given to the resource (FR) Sedimentary and Igneous Franciscan Assemblage Suite -- California Description An account of the resource This 14 sample collection primarily consists of clastic sedimentary rocks with metamorphic and igneous components, representing a Franciscan Assemblage. This assemblage is indicative of a subduction zone along the California coast. Contributor An entity responsible for making contributions to the resource Western Minerals, Inc. - Collection was supervised by Dr. Frederick C. Marshall, Assistant Professor of Geology at Principia College. References A related resource that is referenced, cited, or otherwise pointed to by the described resource. Start here: Ernst, W.G., 2015, Franciscan geologic history constrained by tectonic/olistostromal high-grade metamafic blocks in the iconic California Mesozoic-Cenozoic accretionary complex: American Mineralogist, v. 100, p. 6-13.Â <a href="http://dx.doi.org/10.2138/am-2015-4850" target="_blank">doi:Â 10.2138/am-2015-4850</a> <ul><li>This source supplies useful information on the low temperature, high pressure environment in which these rocks formed.Â </li> </ul>Additional resources: Barnes, J., Eldam, R., Lee, C.T., Errico, J., Loewy, S., and Cisneros, M., 2013, Petrogenesis of serpentinites from the Franciscan Complex, western California, USA: Lithos, v. 178, p. 143-157.Â <a class="S_C_ddDoi" href="http://dx.doi.org/10.1016/j.lithos.2012.12.018" target="_blank">doi:10.1016/j.lithos.2012.12.018</a> <ul><li>Describes the petrogenesis of serpentine as seen in one of the items in the collection (Fr-4).</li> </ul>Cooper, F., Platt, J., and Anczkiewicz, R., 2011, Constraints on early Franciscan subduction rates from 2-D thermal modeling: Earth and Planetary Science Letters, v. 312, p. 69-79. doi:<a href="http://dx.doi.org/10.1016/j.epsl.2011.09.051">10.1016/j.epsl.2011.09.051</a> <ul><li>This paper suggests that the rate of subduction in this area may have been five times lower than previous studies have found.</li> </ul>Ghatak, A., Basu, A., and Wakabayashi, J., 2013, Implications of Franciscan Complex graywacke geochemistry for sediment transport, provenance determination, burial-exposure duration, and fluid exchange with cosubducted metabasites: Tectonics, v. 32, p. 1480-1492. doi:Â <a href="http://dx.doi.org/10.1002/tect.20078">10.1002/tect.20078</a> <ul><li>This article states that the europium anomalies of the greywacke samples suggest provenance from the Sierra Nevada batholith.</li> </ul>Langenheim, V., Jachens, R., Wentworth, C., and McLaughlin, R., 2013, Previously unrecognized regional structure of the Coastal Belt of the Franciscan Complex, northern California, revealed by magnetic data: Geosphere, v. 9, p. 1514-1529. doi:Â <a href="http://dx.doi.org/10.1130/GES00942.1">10.1130/GES00942.1</a> <ul><li>Using magnetic data, this article provides an overview of the regional structure of the Franciscan Complex.</li> </ul> Spatial Coverage Spatial characteristics of the resource. These specimens were collected across Marin County and the San Francisco Peninsula. Temporal Coverage Temporal characteristics of the resource. The specimens are Mesozoic in age. Rock A physical material with a mineral composition. Number of Thin Sections Number of thin sections associated with this sample 1 Dublin Core The Dublin Core metadata element set is common to all Omeka records, including items, files, and collections. For more information see, http://dublincore.org/documents/dces/. Title A name given to the resource Calera-type Limestone with Chert Alternative Title An alternative name for the resource. The distinction between titles and alternative titles is application-specific. Limestone with Chert Description An account of the resource Groundmass dominated by grey calcite and dolomite. Calcite and dolomite crystals are subhedral in thin section and hand sample.. (FOV: 1.28) Date A point or period of time associated with an event in the lifecycle of the resource Not given Contributor An entity responsible for making contributions to the resource Western Minerals, Inc. Is Part Of A related resource in which the described resource is physically or logically included. <a href="http://www.geosciencecollections.milne-library.org/collections/show/12">Stratigraphic Suite- Franciscan Rocks, California</a> Identifier An unambiguous reference to the resource within a given context FR-8 Spatial Coverage Spatial characteristics of the resource. Permanent Cement Co. quarry, near Cupertino. Take I 280 south from San Francisco to Foothill Expressway, then west to Stevens Creek Road, then right on Stevens Creek Road to end. Temporal Coverage Temporal characteristics of the resource. Mesozoic Accrual Method The method by which items are added to a collection. 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Title A name given to the resource (FR) Sedimentary and Igneous Franciscan Assemblage Suite -- California Description An account of the resource This 14 sample collection primarily consists of clastic sedimentary rocks with metamorphic and igneous components, representing a Franciscan Assemblage. This assemblage is indicative of a subduction zone along the California coast. Contributor An entity responsible for making contributions to the resource Western Minerals, Inc. - Collection was supervised by Dr. Frederick C. Marshall, Assistant Professor of Geology at Principia College. References A related resource that is referenced, cited, or otherwise pointed to by the described resource. Start here: Ernst, W.G., 2015, Franciscan geologic history constrained by tectonic/olistostromal high-grade metamafic blocks in the iconic California Mesozoic-Cenozoic accretionary complex: American Mineralogist, v. 100, p. 6-13.Â <a href="http://dx.doi.org/10.2138/am-2015-4850" target="_blank">doi:Â 10.2138/am-2015-4850</a> <ul><li>This source supplies useful information on the low temperature, high pressure environment in which these rocks formed.Â </li> </ul>Additional resources: Barnes, J., Eldam, R., Lee, C.T., Errico, J., Loewy, S., and Cisneros, M., 2013, Petrogenesis of serpentinites from the Franciscan Complex, western California, USA: Lithos, v. 178, p. 143-157.Â <a class="S_C_ddDoi" href="http://dx.doi.org/10.1016/j.lithos.2012.12.018" target="_blank">doi:10.1016/j.lithos.2012.12.018</a> <ul><li>Describes the petrogenesis of serpentine as seen in one of the items in the collection (Fr-4).</li> </ul>Cooper, F., Platt, J., and Anczkiewicz, R., 2011, Constraints on early Franciscan subduction rates from 2-D thermal modeling: Earth and Planetary Science Letters, v. 312, p. 69-79. doi:<a href="http://dx.doi.org/10.1016/j.epsl.2011.09.051">10.1016/j.epsl.2011.09.051</a> <ul><li>This paper suggests that the rate of subduction in this area may have been five times lower than previous studies have found.</li> </ul>Ghatak, A., Basu, A., and Wakabayashi, J., 2013, Implications of Franciscan Complex graywacke geochemistry for sediment transport, provenance determination, burial-exposure duration, and fluid exchange with cosubducted metabasites: Tectonics, v. 32, p. 1480-1492. doi:Â <a href="http://dx.doi.org/10.1002/tect.20078">10.1002/tect.20078</a> <ul><li>This article states that the europium anomalies of the greywacke samples suggest provenance from the Sierra Nevada batholith.</li> </ul>Langenheim, V., Jachens, R., Wentworth, C., and McLaughlin, R., 2013, Previously unrecognized regional structure of the Coastal Belt of the Franciscan Complex, northern California, revealed by magnetic data: Geosphere, v. 9, p. 1514-1529. doi:Â <a href="http://dx.doi.org/10.1130/GES00942.1">10.1130/GES00942.1</a> <ul><li>Using magnetic data, this article provides an overview of the regional structure of the Franciscan Complex.</li> </ul> Spatial Coverage Spatial characteristics of the resource. These specimens were collected across Marin County and the San Francisco Peninsula. Temporal Coverage Temporal characteristics of the resource. The specimens are Mesozoic in age. Rock A physical material with a mineral composition. Number of Thin Sections Number of thin sections associated with this sample 1 Dublin Core The Dublin Core metadata element set is common to all Omeka records, including items, files, and collections. For more information see, http://dublincore.org/documents/dces/. Title A name given to the resource Calera type Limestone Alternative Title An alternative name for the resource. The distinction between titles and alternative titles is application-specific. Limestone Description An account of the resource Fresh surfaces contain grey-white, anhedral calcite and dolomite crystals. Weathered surfaces are dark brown, with a fine powder observable after handling in hand sample. Bubbles from acid reaction turn dark brown on weathered surfaces. These weathered bubbles leave behind a brown residue. Bubbles on fresh faces remain white and leave no residue. (FOV: 1.28) Date A point or period of time associated with an event in the lifecycle of the resource Not given Contributor An entity responsible for making contributions to the resource Western Minerals, Inc. Is Part Of A related resource in which the described resource is physically or logically included. <a href="http://www.geosciencecollections.milne-library.org/collections/show/12">Stratigraphic Suite- Franciscan Rocks, California</a> Identifier An unambiguous reference to the resource within a given context FR-9 Spatial Coverage Spatial characteristics of the resource. Same locality as FR-8 Temporal Coverage Temporal characteristics of the resource. Mesozoic Accrual Method The method by which items are added to a collection. 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For more information see, http://dublincore.org/documents/dces/. Title A name given to the resource (FR) Sedimentary and Igneous Franciscan Assemblage Suite -- California Description An account of the resource This 14 sample collection primarily consists of clastic sedimentary rocks with metamorphic and igneous components, representing a Franciscan Assemblage. This assemblage is indicative of a subduction zone along the California coast. Contributor An entity responsible for making contributions to the resource Western Minerals, Inc. - Collection was supervised by Dr. Frederick C. Marshall, Assistant Professor of Geology at Principia College. References A related resource that is referenced, cited, or otherwise pointed to by the described resource. Start here: Ernst, W.G., 2015, Franciscan geologic history constrained by tectonic/olistostromal high-grade metamafic blocks in the iconic California Mesozoic-Cenozoic accretionary complex: American Mineralogist, v. 100, p. 6-13.Â <a href="http://dx.doi.org/10.2138/am-2015-4850" target="_blank">doi:Â 10.2138/am-2015-4850</a> <ul><li>This source supplies useful information on the low temperature, high pressure environment in which these rocks formed.Â </li> </ul>Additional resources: Barnes, J., Eldam, R., Lee, C.T., Errico, J., Loewy, S., and Cisneros, M., 2013, Petrogenesis of serpentinites from the Franciscan Complex, western California, USA: Lithos, v. 178, p. 143-157.Â <a class="S_C_ddDoi" href="http://dx.doi.org/10.1016/j.lithos.2012.12.018" target="_blank">doi:10.1016/j.lithos.2012.12.018</a> <ul><li>Describes the petrogenesis of serpentine as seen in one of the items in the collection (Fr-4).</li> </ul>Cooper, F., Platt, J., and Anczkiewicz, R., 2011, Constraints on early Franciscan subduction rates from 2-D thermal modeling: Earth and Planetary Science Letters, v. 312, p. 69-79. doi:<a href="http://dx.doi.org/10.1016/j.epsl.2011.09.051">10.1016/j.epsl.2011.09.051</a> <ul><li>This paper suggests that the rate of subduction in this area may have been five times lower than previous studies have found.</li> </ul>Ghatak, A., Basu, A., and Wakabayashi, J., 2013, Implications of Franciscan Complex graywacke geochemistry for sediment transport, provenance determination, burial-exposure duration, and fluid exchange with cosubducted metabasites: Tectonics, v. 32, p. 1480-1492. doi:Â <a href="http://dx.doi.org/10.1002/tect.20078">10.1002/tect.20078</a> <ul><li>This article states that the europium anomalies of the greywacke samples suggest provenance from the Sierra Nevada batholith.</li> </ul>Langenheim, V., Jachens, R., Wentworth, C., and McLaughlin, R., 2013, Previously unrecognized regional structure of the Coastal Belt of the Franciscan Complex, northern California, revealed by magnetic data: Geosphere, v. 9, p. 1514-1529. doi:Â <a href="http://dx.doi.org/10.1130/GES00942.1">10.1130/GES00942.1</a> <ul><li>Using magnetic data, this article provides an overview of the regional structure of the Franciscan Complex.</li> </ul> Spatial Coverage Spatial characteristics of the resource. These specimens were collected across Marin County and the San Francisco Peninsula. Temporal Coverage Temporal characteristics of the resource. The specimens are Mesozoic in age. Rock A physical material with a mineral composition. Number of Thin Sections Number of thin sections associated with this sample 1 Dublin Core The Dublin Core metadata element set is common to all Omeka records, including items, files, and collections. For more information see, http://dublincore.org/documents/dces/. Title A name given to the resource Arkosic Graywacke Alternative Title An alternative name for the resource. The distinction between titles and alternative titles is application-specific. Sandstone Description An account of the resource Coarse sand grains made of quartz, surrounded by smaller feldspar grains. Greenish blue surface color, minimal surface weathering. (Thin section FOV: 1.28) Date A point or period of time associated with an event in the lifecycle of the resource Not given Contributor An entity responsible for making contributions to the resource Western Minerals, Inc. Is Part Of A related resource in which the described resource is physically or logically included. <a href="http://www.geosciencecollections.milne-library.org/collections/show/12">Stratigraphic Suite- Franciscan Rocks, California</a> Identifier An unambiguous reference to the resource within a given context FR-10 Spatial Coverage Spatial characteristics of the resource. Quarry face at back of parking lot of Castle Lanes Bowling Center on Geneva Ave. (near the Cow palace) on the north side of San Bruno Mountain. Temporal Coverage Temporal characteristics of the resource. Mesozoic Accrual Method The method by which items are added to a collection. 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Width 2560 Height 1920 Bit Depth 8 Channels 3 https://dev.geosciencecollections.milne-library.org/files/original/38ca5fc86e195e1d94919cc890d227fd.JPG f910400a9744d0027fb4e0478699e983 Omeka Image File The metadata element set that was included in the `files_images` table in previous versions of Omeka. These elements are common to all image files. Width 2560 Height 1920 Bit Depth 8 Channels 3 Dublin Core The Dublin Core metadata element set is common to all Omeka records, including items, files, and collections. For more information see, http://dublincore.org/documents/dces/. Title A name given to the resource (FR) Sedimentary and Igneous Franciscan Assemblage Suite -- California Description An account of the resource This 14 sample collection primarily consists of clastic sedimentary rocks with metamorphic and igneous components, representing a Franciscan Assemblage. This assemblage is indicative of a subduction zone along the California coast. Contributor An entity responsible for making contributions to the resource Western Minerals, Inc. - Collection was supervised by Dr. Frederick C. Marshall, Assistant Professor of Geology at Principia College. References A related resource that is referenced, cited, or otherwise pointed to by the described resource. Start here: Ernst, W.G., 2015, Franciscan geologic history constrained by tectonic/olistostromal high-grade metamafic blocks in the iconic California Mesozoic-Cenozoic accretionary complex: American Mineralogist, v. 100, p. 6-13.Â <a href="http://dx.doi.org/10.2138/am-2015-4850" target="_blank">doi:Â 10.2138/am-2015-4850</a> <ul><li>This source supplies useful information on the low temperature, high pressure environment in which these rocks formed.Â </li> </ul>Additional resources: Barnes, J., Eldam, R., Lee, C.T., Errico, J., Loewy, S., and Cisneros, M., 2013, Petrogenesis of serpentinites from the Franciscan Complex, western California, USA: Lithos, v. 178, p. 143-157.Â <a class="S_C_ddDoi" href="http://dx.doi.org/10.1016/j.lithos.2012.12.018" target="_blank">doi:10.1016/j.lithos.2012.12.018</a> <ul><li>Describes the petrogenesis of serpentine as seen in one of the items in the collection (Fr-4).</li> </ul>Cooper, F., Platt, J., and Anczkiewicz, R., 2011, Constraints on early Franciscan subduction rates from 2-D thermal modeling: Earth and Planetary Science Letters, v. 312, p. 69-79. doi:<a href="http://dx.doi.org/10.1016/j.epsl.2011.09.051">10.1016/j.epsl.2011.09.051</a> <ul><li>This paper suggests that the rate of subduction in this area may have been five times lower than previous studies have found.</li> </ul>Ghatak, A., Basu, A., and Wakabayashi, J., 2013, Implications of Franciscan Complex graywacke geochemistry for sediment transport, provenance determination, burial-exposure duration, and fluid exchange with cosubducted metabasites: Tectonics, v. 32, p. 1480-1492. doi:Â <a href="http://dx.doi.org/10.1002/tect.20078">10.1002/tect.20078</a> <ul><li>This article states that the europium anomalies of the greywacke samples suggest provenance from the Sierra Nevada batholith.</li> </ul>Langenheim, V., Jachens, R., Wentworth, C., and McLaughlin, R., 2013, Previously unrecognized regional structure of the Coastal Belt of the Franciscan Complex, northern California, revealed by magnetic data: Geosphere, v. 9, p. 1514-1529. doi:Â <a href="http://dx.doi.org/10.1130/GES00942.1">10.1130/GES00942.1</a> <ul><li>Using magnetic data, this article provides an overview of the regional structure of the Franciscan Complex.</li> </ul> Spatial Coverage Spatial characteristics of the resource. These specimens were collected across Marin County and the San Francisco Peninsula. Temporal Coverage Temporal characteristics of the resource. The specimens are Mesozoic in age. Rock A physical material with a mineral composition. Number of Thin Sections Number of thin sections associated with this sample 1 Dublin Core The Dublin Core metadata element set is common to all Omeka records, including items, files, and collections. For more information see, http://dublincore.org/documents/dces/. Title A name given to the resource Radiolarian Chert and Shale Description An account of the resource More orange in color that FR-3 (Red Chert). Radiolaria fossils are visible in thin section amongst red-orange martix. (Thin Section FOV: 1.28) Date A point or period of time associated with an event in the lifecycle of the resource Not given Contributor An entity responsible for making contributions to the resource Western Minerals, Inc. 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Width 2560 Height 1920 Bit Depth 8 Channels 3 https://dev.geosciencecollections.milne-library.org/files/original/91c04b6ac419ce936bcb089007667614.JPG 8d5da4777c2317f9a37cd135bfa28d8e Omeka Image File The metadata element set that was included in the `files_images` table in previous versions of Omeka. These elements are common to all image files. Width 2560 Height 1920 Bit Depth 8 Channels 3 Dublin Core The Dublin Core metadata element set is common to all Omeka records, including items, files, and collections. For more information see, http://dublincore.org/documents/dces/. Title A name given to the resource (FR) Sedimentary and Igneous Franciscan Assemblage Suite -- California Description An account of the resource This 14 sample collection primarily consists of clastic sedimentary rocks with metamorphic and igneous components, representing a Franciscan Assemblage. This assemblage is indicative of a subduction zone along the California coast. Contributor An entity responsible for making contributions to the resource Western Minerals, Inc. - Collection was supervised by Dr. Frederick C. Marshall, Assistant Professor of Geology at Principia College. References A related resource that is referenced, cited, or otherwise pointed to by the described resource. Start here: Ernst, W.G., 2015, Franciscan geologic history constrained by tectonic/olistostromal high-grade metamafic blocks in the iconic California Mesozoic-Cenozoic accretionary complex: American Mineralogist, v. 100, p. 6-13.Â <a href="http://dx.doi.org/10.2138/am-2015-4850" target="_blank">doi:Â 10.2138/am-2015-4850</a> <ul><li>This source supplies useful information on the low temperature, high pressure environment in which these rocks formed.Â </li> </ul>Additional resources: Barnes, J., Eldam, R., Lee, C.T., Errico, J., Loewy, S., and Cisneros, M., 2013, Petrogenesis of serpentinites from the Franciscan Complex, western California, USA: Lithos, v. 178, p. 143-157.Â <a class="S_C_ddDoi" href="http://dx.doi.org/10.1016/j.lithos.2012.12.018" target="_blank">doi:10.1016/j.lithos.2012.12.018</a> <ul><li>Describes the petrogenesis of serpentine as seen in one of the items in the collection (Fr-4).</li> </ul>Cooper, F., Platt, J., and Anczkiewicz, R., 2011, Constraints on early Franciscan subduction rates from 2-D thermal modeling: Earth and Planetary Science Letters, v. 312, p. 69-79. doi:<a href="http://dx.doi.org/10.1016/j.epsl.2011.09.051">10.1016/j.epsl.2011.09.051</a> <ul><li>This paper suggests that the rate of subduction in this area may have been five times lower than previous studies have found.</li> </ul>Ghatak, A., Basu, A., and Wakabayashi, J., 2013, Implications of Franciscan Complex graywacke geochemistry for sediment transport, provenance determination, burial-exposure duration, and fluid exchange with cosubducted metabasites: Tectonics, v. 32, p. 1480-1492. doi:Â <a href="http://dx.doi.org/10.1002/tect.20078">10.1002/tect.20078</a> <ul><li>This article states that the europium anomalies of the greywacke samples suggest provenance from the Sierra Nevada batholith.</li> </ul>Langenheim, V., Jachens, R., Wentworth, C., and McLaughlin, R., 2013, Previously unrecognized regional structure of the Coastal Belt of the Franciscan Complex, northern California, revealed by magnetic data: Geosphere, v. 9, p. 1514-1529. doi:Â <a href="http://dx.doi.org/10.1130/GES00942.1">10.1130/GES00942.1</a> <ul><li>Using magnetic data, this article provides an overview of the regional structure of the Franciscan Complex.</li> </ul> Spatial Coverage Spatial characteristics of the resource. These specimens were collected across Marin County and the San Francisco Peninsula. Temporal Coverage Temporal characteristics of the resource. The specimens are Mesozoic in age. Rock A physical material with a mineral composition. Number of Thin Sections Number of thin sections associated with this sample 1 Dublin Core The Dublin Core metadata element set is common to all Omeka records, including items, files, and collections. For more information see, http://dublincore.org/documents/dces/. Title A name given to the resource Graywacke Alternative Title An alternative name for the resource. The distinction between titles and alternative titles is application-specific. Sandstone Description An account of the resource Sand sized quartz grains and smaller feldspars make up the matrix. Grey-brown sand weathers to a rusty golden color. (Thin Section FOV: 1.28mm) Date A point or period of time associated with an event in the lifecycle of the resource Not given Contributor An entity responsible for making contributions to the resource Western Minerals, Inc. Is Part Of A related resource in which the described resource is physically or logically included. <a href="http://www.geosciencecollections.milne-library.org/collections/show/12">Stratigraphic Suite- Franciscan Rocks, California</a> Identifier An unambiguous reference to the resource within a given context FR-12 Spatial Coverage Spatial characteristics of the resource. Old quarry face in north side of Telegraph Hill, on Kearny St, just south of Francisco Street. Temporal Coverage Temporal characteristics of the resource. Mesozoic Accrual Method The method by which items are added to a collection. 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Width 2560 Height 1920 Bit Depth 8 Channels 3 https://dev.geosciencecollections.milne-library.org/files/original/5428fc44c30caa11dc3ba2db6abb94cd.JPG 0f59faf2303af8c4de0c1b0e94aa5d85 Omeka Image File The metadata element set that was included in the `files_images` table in previous versions of Omeka. These elements are common to all image files. Width 2560 Height 1920 Bit Depth 8 Channels 3 Dublin Core The Dublin Core metadata element set is common to all Omeka records, including items, files, and collections. For more information see, http://dublincore.org/documents/dces/. Title A name given to the resource (FR) Sedimentary and Igneous Franciscan Assemblage Suite -- California Description An account of the resource This 14 sample collection primarily consists of clastic sedimentary rocks with metamorphic and igneous components, representing a Franciscan Assemblage. This assemblage is indicative of a subduction zone along the California coast. Contributor An entity responsible for making contributions to the resource Western Minerals, Inc. - Collection was supervised by Dr. Frederick C. Marshall, Assistant Professor of Geology at Principia College. References A related resource that is referenced, cited, or otherwise pointed to by the described resource. Start here: Ernst, W.G., 2015, Franciscan geologic history constrained by tectonic/olistostromal high-grade metamafic blocks in the iconic California Mesozoic-Cenozoic accretionary complex: American Mineralogist, v. 100, p. 6-13.Â <a href="http://dx.doi.org/10.2138/am-2015-4850" target="_blank">doi:Â 10.2138/am-2015-4850</a> <ul><li>This source supplies useful information on the low temperature, high pressure environment in which these rocks formed.Â </li> </ul>Additional resources: Barnes, J., Eldam, R., Lee, C.T., Errico, J., Loewy, S., and Cisneros, M., 2013, Petrogenesis of serpentinites from the Franciscan Complex, western California, USA: Lithos, v. 178, p. 143-157.Â <a class="S_C_ddDoi" href="http://dx.doi.org/10.1016/j.lithos.2012.12.018" target="_blank">doi:10.1016/j.lithos.2012.12.018</a> <ul><li>Describes the petrogenesis of serpentine as seen in one of the items in the collection (Fr-4).</li> </ul>Cooper, F., Platt, J., and Anczkiewicz, R., 2011, Constraints on early Franciscan subduction rates from 2-D thermal modeling: Earth and Planetary Science Letters, v. 312, p. 69-79. doi:<a href="http://dx.doi.org/10.1016/j.epsl.2011.09.051">10.1016/j.epsl.2011.09.051</a> <ul><li>This paper suggests that the rate of subduction in this area may have been five times lower than previous studies have found.</li> </ul>Ghatak, A., Basu, A., and Wakabayashi, J., 2013, Implications of Franciscan Complex graywacke geochemistry for sediment transport, provenance determination, burial-exposure duration, and fluid exchange with cosubducted metabasites: Tectonics, v. 32, p. 1480-1492. doi:Â <a href="http://dx.doi.org/10.1002/tect.20078">10.1002/tect.20078</a> <ul><li>This article states that the europium anomalies of the greywacke samples suggest provenance from the Sierra Nevada batholith.</li> </ul>Langenheim, V., Jachens, R., Wentworth, C., and McLaughlin, R., 2013, Previously unrecognized regional structure of the Coastal Belt of the Franciscan Complex, northern California, revealed by magnetic data: Geosphere, v. 9, p. 1514-1529. doi:Â <a href="http://dx.doi.org/10.1130/GES00942.1">10.1130/GES00942.1</a> <ul><li>Using magnetic data, this article provides an overview of the regional structure of the Franciscan Complex.</li> </ul> Spatial Coverage Spatial characteristics of the resource. These specimens were collected across Marin County and the San Francisco Peninsula. Temporal Coverage Temporal characteristics of the resource. The specimens are Mesozoic in age. Rock A physical material with a mineral composition. Number of Thin Sections Number of thin sections associated with this sample 1 Dublin Core The Dublin Core metadata element set is common to all Omeka records, including items, files, and collections. For more information see, http://dublincore.org/documents/dces/. Title A name given to the resource Graywacke Alternative Title An alternative name for the resource. The distinction between titles and alternative titles is application-specific. Siltstone Description An account of the resource Equal mix of angular and rounded sand-sized grains of quartz, with clay sized feldspars. Surface contains significant coverage of calcite that formed after lithification. Fresh surfaces do not effervesce with acid meaning that reaction is based on secondary calcite formation. (Thin Section FOV: 1.28mm) Date A point or period of time associated with an event in the lifecycle of the resource Not given Contributor An entity responsible for making contributions to the resource Western Minerals, Inc. Is Part Of A related resource in which the described resource is physically or logically included. <a href="http://www.geosciencecollections.milne-library.org/collections/show/12">Stratigraphic Suite- Franciscan Rocks, California</a> Identifier An unambiguous reference to the resource within a given context FR-13 Spatial Coverage Spatial characteristics of the resource. In an old quarry just east of state Highway 1 just south of the town of Tomales in the northern part of Marin County. Temporal Coverage Temporal characteristics of the resource. Mesozoic Accrual Method The method by which items are added to a collection. Purchased from Western Minerals, Inc. https://dev.geosciencecollections.milne-library.org/files/original/72bdaff93908a0055075afb6729047e2.jpg d8e8da222e6e0cc70fb617953f2a5dc0 Omeka Image File The metadata element set that was included in the `files_images` table in previous versions of Omeka. These elements are common to all image files. Width 2658 Height 1780 Bit Depth 8 Channels 3 IPTC String date_created:05.10.2013 IPTC Array a:1:{s:12:"date_created";s:10:"05.10.2013";} https://dev.geosciencecollections.milne-library.org/files/original/ef55845854a78dbd0a43342929af7466.jpg 9b079895fa15d0dc3831593aa417b8b5 Omeka Image File The metadata element set that was included in the `files_images` table in previous versions of Omeka. These elements are common to all image files. 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For more information see, http://dublincore.org/documents/dces/. Title A name given to the resource (FR) Sedimentary and Igneous Franciscan Assemblage Suite -- California Description An account of the resource This 14 sample collection primarily consists of clastic sedimentary rocks with metamorphic and igneous components, representing a Franciscan Assemblage. This assemblage is indicative of a subduction zone along the California coast. Contributor An entity responsible for making contributions to the resource Western Minerals, Inc. - Collection was supervised by Dr. Frederick C. Marshall, Assistant Professor of Geology at Principia College. References A related resource that is referenced, cited, or otherwise pointed to by the described resource. Start here: Ernst, W.G., 2015, Franciscan geologic history constrained by tectonic/olistostromal high-grade metamafic blocks in the iconic California Mesozoic-Cenozoic accretionary complex: American Mineralogist, v. 100, p. 6-13.Â <a href="http://dx.doi.org/10.2138/am-2015-4850" target="_blank">doi:Â 10.2138/am-2015-4850</a> <ul><li>This source supplies useful information on the low temperature, high pressure environment in which these rocks formed.Â </li> </ul>Additional resources: Barnes, J., Eldam, R., Lee, C.T., Errico, J., Loewy, S., and Cisneros, M., 2013, Petrogenesis of serpentinites from the Franciscan Complex, western California, USA: Lithos, v. 178, p. 143-157.Â <a class="S_C_ddDoi" href="http://dx.doi.org/10.1016/j.lithos.2012.12.018" target="_blank">doi:10.1016/j.lithos.2012.12.018</a> <ul><li>Describes the petrogenesis of serpentine as seen in one of the items in the collection (Fr-4).</li> </ul>Cooper, F., Platt, J., and Anczkiewicz, R., 2011, Constraints on early Franciscan subduction rates from 2-D thermal modeling: Earth and Planetary Science Letters, v. 312, p. 69-79. doi:<a href="http://dx.doi.org/10.1016/j.epsl.2011.09.051">10.1016/j.epsl.2011.09.051</a> <ul><li>This paper suggests that the rate of subduction in this area may have been five times lower than previous studies have found.</li> </ul>Ghatak, A., Basu, A., and Wakabayashi, J., 2013, Implications of Franciscan Complex graywacke geochemistry for sediment transport, provenance determination, burial-exposure duration, and fluid exchange with cosubducted metabasites: Tectonics, v. 32, p. 1480-1492. doi:Â <a href="http://dx.doi.org/10.1002/tect.20078">10.1002/tect.20078</a> <ul><li>This article states that the europium anomalies of the greywacke samples suggest provenance from the Sierra Nevada batholith.</li> </ul>Langenheim, V., Jachens, R., Wentworth, C., and McLaughlin, R., 2013, Previously unrecognized regional structure of the Coastal Belt of the Franciscan Complex, northern California, revealed by magnetic data: Geosphere, v. 9, p. 1514-1529. doi:Â <a href="http://dx.doi.org/10.1130/GES00942.1">10.1130/GES00942.1</a> <ul><li>Using magnetic data, this article provides an overview of the regional structure of the Franciscan Complex.</li> </ul> Spatial Coverage Spatial characteristics of the resource. These specimens were collected across Marin County and the San Francisco Peninsula. Temporal Coverage Temporal characteristics of the resource. The specimens are Mesozoic in age. Rock A physical material with a mineral composition. Number of Thin Sections Number of thin sections associated with this sample 1 Dublin Core The Dublin Core metadata element set is common to all Omeka records, including items, files, and collections. For more information see, http://dublincore.org/documents/dces/. Title A name given to the resource Black Silty Shale Alternative Title An alternative name for the resource. The distinction between titles and alternative titles is application-specific. Shale Description An account of the resource Clay sized feldspars and quartz present, but majority of crystal grains too small to identify in thin section. Surface contains some calcite that formed after lithification. Fresh surfaces do not effervesce with acid meaning reaction is caused by secondary calcite growth. (Thin Section FOV: 0.64mm) Date A point or period of time associated with an event in the lifecycle of the resource Not given Contributor An entity responsible for making contributions to the resource Western Minerals, Inc. Is Part Of A related resource in which the described resource is physically or logically included. <a href="http://www.geosciencecollections.milne-library.org/collections/show/12">Stratigraphic Suite- Franciscan Rocks, California</a> Identifier An unambiguous reference to the resource within a given context FR-14 Spatial Coverage Spatial characteristics of the resource. Same locality as FR-13 Temporal Coverage Temporal characteristics of the resource. Mesozoic Accrual Method The method by which items are added to a collection. Purchased from Western Minerals, Inc. https://dev.geosciencecollections.milne-library.org/files/original/6acbc266e2f344ea2732c2cce34e97af.jpeg 9d4c1b1c84f8c9e592dab78f67324f5c Dublin Core The Dublin Core metadata element set is common to all Omeka records, including items, files, and collections. For more information see, http://dublincore.org/documents/dces/. Title A name given to the resource Hand Sample https://dev.geosciencecollections.milne-library.org/files/original/3ef1ea784094e723d3ff29469f9f5a2a.jpg 4af7afe9347625f72b5dcc8bdbc11cea Dublin Core The Dublin Core metadata element set is common to all Omeka records, including items, files, and collections. For more information see, http://dublincore.org/documents/dces/. Title A name given to the resource 40x Magnification https://dev.geosciencecollections.milne-library.org/files/original/9cc71e5c5cfb954d3257148b1a730bd1.jpg 9960af1005c7be003af61415f886a351 Dublin Core The Dublin Core metadata element set is common to all Omeka records, including items, files, and collections. For more information see, http://dublincore.org/documents/dces/. Title A name given to the resource 100x Magnification Dublin Core The Dublin Core metadata element set is common to all Omeka records, including items, files, and collections. For more information see, http://dublincore.org/documents/dces/. Title A name given to the resource (HA) Volcanic Phenomena Suite -- The Hawaiian Islands of Hawaii and Oahu Description An account of the resource These 31 samples comprise a collection of volcanic rocks associated with the hot-spot volcanism of the Hawaiian Islands. Samples were collected from various locations across the islands of Hawaii and Oahu. The collection contains samples of primarily tholeiitic & alkalic basalts, pumice, scoria, oceanite, and hawaiite. Contributor An entity responsible for making contributions to the resource Western Minerals, Inc. Date A point or period of time associated with an event in the lifecycle of the resource 1969 Identifier An unambiguous reference to the resource within a given context HA-1 - HA-31 Spatial Coverage Spatial characteristics of the resource. Samples were collected from various locations on the islands of Hawaii and Oahu. Temporal Coverage Temporal characteristics of the resource. Samples formed from Holocene eruptions of the past 300 years. Dated samples formed between 1750 and 1960. Accrual Method The method by which items are added to a collection. Purchased from Western Minerals, Inc. References A related resource that is referenced, cited, or otherwise pointed to by the described resource. Start here: Macdonald, G.A., 1949, Petrography of the Island of Hawaii, U.S.G.S. Prof. Paper 214 D <ul><li>This article is a part of the general investigation of the island of Hawaii by the United States Geologic Survey. The paper describes the dominant volcanoes of the island of Hawaii (from which most of the suite's samples were collected) and describes the petrographic phenomena observed and geochemical analyses of volcanic rocks.Â </li> </ul>Additional Resources: Ho, R.A., Garcia, M.O., 1988, Origin of differentiated lavas at Kilauea Volcano, Hawaii; implications from the 1955 eruption: Bulletin of Volcanology, v. 50, p. 35-46. <ul><li>This article describes a study of lava flows from the 1955 eruption of the Kilauea Volcano on the island of Hawaii to evaluate models of crystal fractionation or magma mixing as the processes forming differentiated magmas. Through geochemical analyses, the study concluded that crystal fractionation resulted in the observed differentiation of lavas.</li> </ul> Hofman, A.W., Farnetani, C.G., 2013, Two Views of Hawaiian Plume Structure: Geochemistry, Geophysics, Geosystems, v.14, p. 5308-5322, doi:10.1002/2013GC004942 <ul><li>This article presents two opposing views of the source of magmas for the Hawaiian volcanoes. Both views favor a deep mantle source, but try to explain differences in isotopic compositions.</li> </ul> Macdonald, G.A., 1968, Composition and origin of Hawaiian LavasÂ in GSA Memoirs 1968, p. 477-522 <ul><li>This article provides geochemical analysis of major elements as well as determinations of minor elements of volcanic rocks from the island of Hawaii. The article describes the three major rock types - tholeitic, alkalic, and nephelinic - and concludes these rock suites are chemically intergradational and are likely derived from crystal differentiation of a single parent magma.</li> </ul> Moore, J.G., Clague, D.A., 1992, Volcano growth and evolution of the Island of Hawaii: Geologic Society of America Bulletin, v. 104, p. 1471-1484 <ul><li>This article proposes a chronologic evolution of the island of Hawaii, from where many of the suite's samples were collected.</li> </ul> Rock A physical material with a mineral composition. Dublin Core The Dublin Core metadata element set is common to all Omeka records, including items, files, and collections. For more information see, http://dublincore.org/documents/dces/. Title A name given to the resource Tholeiitic Basalt Description An account of the resource Hand Sample: Aphanitic vesicular dark gray-black basalt. Sample contains numerous vesicles ranging in size from 0.01cm to 1.5 cm. Thin Section: Groundmass of aphanitic plagioclase. Plagioclase grains vary in size with some larger grains throughout sample. Numerous vesicles are present throughout thin section. Contributor An entity responsible for making contributions to the resource Western Minerals Is Part Of A related resource in which the described resource is physically or logically included. <a href="http://geosciencecollections.milne-library.org/admin/collections/show/16">Volcanic Phenomena Suite - The Hawaiian Islands of Hawaii and Oahu</a> Identifier An unambiguous reference to the resource within a given context HA-1 Spatial Coverage Spatial characteristics of the resource. Kiluea Volcano - Island of Hawaii Temporal Coverage Temporal characteristics of the resource. 1750 Date A point or period of time associated with an event in the lifecycle of the resource Sample collected January, 1969 https://dev.geosciencecollections.milne-library.org/files/original/ed1c3555ed945e377e9dd29598ad4177.jpeg a9979075d64c31f0c3708d45f389c772 Dublin Core The Dublin Core metadata element set is common to all Omeka records, including items, files, and collections. For more information see, http://dublincore.org/documents/dces/. Title A name given to the resource Hand Sample https://dev.geosciencecollections.milne-library.org/files/original/3d2f227db113886ee73a36e5f1efeda9.jpg 1bf18f27f4c946becc3481188949a390 Dublin Core The Dublin Core metadata element set is common to all Omeka records, including items, files, and collections. For more information see, http://dublincore.org/documents/dces/. Title A name given to the resource 100x Magnification https://dev.geosciencecollections.milne-library.org/files/original/552e99312842808540443890e78f87f8.jpg 21cd9d29f107f18529e905e3232488f7 Dublin Core The Dublin Core metadata element set is common to all Omeka records, including items, files, and collections. For more information see, http://dublincore.org/documents/dces/. Title A name given to the resource 40x Magnification Dublin Core The Dublin Core metadata element set is common to all Omeka records, including items, files, and collections. For more information see, http://dublincore.org/documents/dces/. Title A name given to the resource (HA) Volcanic Phenomena Suite -- The Hawaiian Islands of Hawaii and Oahu Description An account of the resource These 31 samples comprise a collection of volcanic rocks associated with the hot-spot volcanism of the Hawaiian Islands. Samples were collected from various locations across the islands of Hawaii and Oahu. The collection contains samples of primarily tholeiitic & alkalic basalts, pumice, scoria, oceanite, and hawaiite. Contributor An entity responsible for making contributions to the resource Western Minerals, Inc. Date A point or period of time associated with an event in the lifecycle of the resource 1969 Identifier An unambiguous reference to the resource within a given context HA-1 - HA-31 Spatial Coverage Spatial characteristics of the resource. Samples were collected from various locations on the islands of Hawaii and Oahu. Temporal Coverage Temporal characteristics of the resource. Samples formed from Holocene eruptions of the past 300 years. Dated samples formed between 1750 and 1960. Accrual Method The method by which items are added to a collection. Purchased from Western Minerals, Inc. References A related resource that is referenced, cited, or otherwise pointed to by the described resource. Start here: Macdonald, G.A., 1949, Petrography of the Island of Hawaii, U.S.G.S. Prof. Paper 214 D <ul><li>This article is a part of the general investigation of the island of Hawaii by the United States Geologic Survey. The paper describes the dominant volcanoes of the island of Hawaii (from which most of the suite's samples were collected) and describes the petrographic phenomena observed and geochemical analyses of volcanic rocks.Â </li> </ul>Additional Resources: Ho, R.A., Garcia, M.O., 1988, Origin of differentiated lavas at Kilauea Volcano, Hawaii; implications from the 1955 eruption: Bulletin of Volcanology, v. 50, p. 35-46. <ul><li>This article describes a study of lava flows from the 1955 eruption of the Kilauea Volcano on the island of Hawaii to evaluate models of crystal fractionation or magma mixing as the processes forming differentiated magmas. Through geochemical analyses, the study concluded that crystal fractionation resulted in the observed differentiation of lavas.</li> </ul> Hofman, A.W., Farnetani, C.G., 2013, Two Views of Hawaiian Plume Structure: Geochemistry, Geophysics, Geosystems, v.14, p. 5308-5322, doi:10.1002/2013GC004942 <ul><li>This article presents two opposing views of the source of magmas for the Hawaiian volcanoes. Both views favor a deep mantle source, but try to explain differences in isotopic compositions.</li> </ul> Macdonald, G.A., 1968, Composition and origin of Hawaiian LavasÂ in GSA Memoirs 1968, p. 477-522 <ul><li>This article provides geochemical analysis of major elements as well as determinations of minor elements of volcanic rocks from the island of Hawaii. The article describes the three major rock types - tholeitic, alkalic, and nephelinic - and concludes these rock suites are chemically intergradational and are likely derived from crystal differentiation of a single parent magma.</li> </ul> Moore, J.G., Clague, D.A., 1992, Volcano growth and evolution of the Island of Hawaii: Geologic Society of America Bulletin, v. 104, p. 1471-1484 <ul><li>This article proposes a chronologic evolution of the island of Hawaii, from where many of the suite's samples were collected.</li> </ul> Rock A physical material with a mineral composition. Number of Thin Sections Number of thin sections associated with this sample 1 Dublin Core The Dublin Core metadata element set is common to all Omeka records, including items, files, and collections. For more information see, http://dublincore.org/documents/dces/. Title A name given to the resource Tholeiitic Basalt Description An account of the resource Hand Sample: Apahanitic vesicular dark gray-black basalt. Larger (<0.05cm), light-colored crystals are visible throughout the sample. Shape of crystals ranges from elongated to square shape. Vesicles size range from 0.01cm to 0.05 cm, and have an elongated, thin shape. Thin Section: Groundmass of aphanitic plagioclase with interstitial glass. Phenocrysts of olivine and plagioclase crystals. Numerous vesicles are present throughout thin section. Contributor An entity responsible for making contributions to the resource Western Minerals Identifier An unambiguous reference to the resource within a given context HA-2 Spatial Coverage Spatial characteristics of the resource. Kiluea Volcano - Island of Hawaii Sample collected on Coast Road, 3.7 miles southwest of Opihikao. Temporal Coverage Temporal characteristics of the resource. Formed from flows associated with the March 28, 1995 eruption. Is Part Of A related resource in which the described resource is physically or logically included. Volcanic Phenomena Suite - The Hawaiian Islands of Hawaii and Oahu Date A point or period of time associated with an event in the lifecycle of the resource Sample collected January, 1969