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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.
<p><strong>Start here:<br /></strong>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. <a href="http://dx.doi.org/10.2138/am-2015-4850" target="_blank"><span>doi: </span><span class="slug-doi">10.2138/am-2015-4850</span></a></p>
<ul><li>This source supplies useful information on the low temperature, high pressure environment in which these rocks formed. </li>
</ul><strong>Additional resources:<br /></strong>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. <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><br /><ul><li>Describes the petrogenesis of serpentine as seen in one of the items in the collection (Fr-4).</li>
</ul><p>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></p>
<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><p>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></p>
<ul><li>This article states that the europium anomalies of the greywacke samples suggest provenance from the Sierra Nevada batholith.</li>
</ul><p>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></p>
<ul><li><span>Using magnetic data, this article provides an overview of the regional structure of the Franciscan Complex.</span></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.
Document
A resource containing textual data. Note that facsimiles or images of texts are still of the genre text.
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
Sedimentary and Igneous Franciscan Assemblage - California: Western Mineral's Inc. Supplementary Information
Description
An account of the resource
OCR PDF of supplemental information of the "Sedimentary and Igneous Franciscan Assemblage - California" collection.
Format
The file format, physical medium, or dimensions of the resource
PDF
Identifier
An unambiguous reference to the resource within a given context
FR-suite
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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.
<p><strong>Start here:<br /></strong>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. <a href="http://dx.doi.org/10.2138/am-2015-4850" target="_blank"><span>doi: </span><span class="slug-doi">10.2138/am-2015-4850</span></a></p>
<ul><li>This source supplies useful information on the low temperature, high pressure environment in which these rocks formed. </li>
</ul><strong>Additional resources:<br /></strong>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. <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><br /><ul><li>Describes the petrogenesis of serpentine as seen in one of the items in the collection (Fr-4).</li>
</ul><p>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></p>
<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><p>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></p>
<ul><li>This article states that the europium anomalies of the greywacke samples suggest provenance from the Sierra Nevada batholith.</li>
</ul><p>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></p>
<ul><li><span>Using magnetic data, this article provides an overview of the regional structure of the Franciscan Complex.</span></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.
Purchased from Western Minerals, Inc.
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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.
<p><strong>Start here:<br /></strong>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. <a href="http://dx.doi.org/10.2138/am-2015-4850" target="_blank"><span>doi: </span><span class="slug-doi">10.2138/am-2015-4850</span></a></p>
<ul><li>This source supplies useful information on the low temperature, high pressure environment in which these rocks formed. </li>
</ul><strong>Additional resources:<br /></strong>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. <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><br /><ul><li>Describes the petrogenesis of serpentine as seen in one of the items in the collection (Fr-4).</li>
</ul><p>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></p>
<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><p>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></p>
<ul><li>This article states that the europium anomalies of the greywacke samples suggest provenance from the Sierra Nevada batholith.</li>
</ul><p>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></p>
<ul><li><span>Using magnetic data, this article provides an overview of the regional structure of the Franciscan Complex.</span></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.
Purchased from Western Minerals, Inc.
-
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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.
<p><strong>Start here:<br /></strong>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. <a href="http://dx.doi.org/10.2138/am-2015-4850" target="_blank"><span>doi: </span><span class="slug-doi">10.2138/am-2015-4850</span></a></p>
<ul><li>This source supplies useful information on the low temperature, high pressure environment in which these rocks formed. </li>
</ul><strong>Additional resources:<br /></strong>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. <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><br /><ul><li>Describes the petrogenesis of serpentine as seen in one of the items in the collection (Fr-4).</li>
</ul><p>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></p>
<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><p>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></p>
<ul><li>This article states that the europium anomalies of the greywacke samples suggest provenance from the Sierra Nevada batholith.</li>
</ul><p>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></p>
<ul><li><span>Using magnetic data, this article provides an overview of the regional structure of the Franciscan Complex.</span></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.
Purchased from Western Minerals, Inc.
-
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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.
<p><strong>Start here:<br /></strong>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. <a href="http://dx.doi.org/10.2138/am-2015-4850" target="_blank"><span>doi: </span><span class="slug-doi">10.2138/am-2015-4850</span></a></p>
<ul><li>This source supplies useful information on the low temperature, high pressure environment in which these rocks formed. </li>
</ul><strong>Additional resources:<br /></strong>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. <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><br /><ul><li>Describes the petrogenesis of serpentine as seen in one of the items in the collection (Fr-4).</li>
</ul><p>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></p>
<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><p>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></p>
<ul><li>This article states that the europium anomalies of the greywacke samples suggest provenance from the Sierra Nevada batholith.</li>
</ul><p>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></p>
<ul><li><span>Using magnetic data, this article provides an overview of the regional structure of the Franciscan Complex.</span></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.
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-4
Spatial Coverage
Spatial characteristics of the resource.
Roadcut on east side of Highway 1 (Panoramic highway) 17 miles El of south side of Golden Gate Bridge go along US 101 then turn on state highway 1 to 17 miles,
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.
-
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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.
<p><strong>Start here:<br /></strong>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. <a href="http://dx.doi.org/10.2138/am-2015-4850" target="_blank"><span>doi: </span><span class="slug-doi">10.2138/am-2015-4850</span></a></p>
<ul><li>This source supplies useful information on the low temperature, high pressure environment in which these rocks formed. </li>
</ul><strong>Additional resources:<br /></strong>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. <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><br /><ul><li>Describes the petrogenesis of serpentine as seen in one of the items in the collection (Fr-4).</li>
</ul><p>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></p>
<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><p>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></p>
<ul><li>This article states that the europium anomalies of the greywacke samples suggest provenance from the Sierra Nevada batholith.</li>
</ul><p>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></p>
<ul><li><span>Using magnetic data, this article provides an overview of the regional structure of the Franciscan Complex.</span></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.
Purchased from Western Minerals, Inc.
-
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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.
<p><strong>Start here:<br /></strong>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. <a href="http://dx.doi.org/10.2138/am-2015-4850" target="_blank"><span>doi: </span><span class="slug-doi">10.2138/am-2015-4850</span></a></p>
<ul><li>This source supplies useful information on the low temperature, high pressure environment in which these rocks formed. </li>
</ul><strong>Additional resources:<br /></strong>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. <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><br /><ul><li>Describes the petrogenesis of serpentine as seen in one of the items in the collection (Fr-4).</li>
</ul><p>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></p>
<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><p>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></p>
<ul><li>This article states that the europium anomalies of the greywacke samples suggest provenance from the Sierra Nevada batholith.</li>
</ul><p>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></p>
<ul><li><span>Using magnetic data, this article provides an overview of the regional structure of the Franciscan Complex.</span></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.
Purchased from Western Minerals, Inc.
-
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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.
<p><strong>Start here:<br /></strong>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. <a href="http://dx.doi.org/10.2138/am-2015-4850" target="_blank"><span>doi: </span><span class="slug-doi">10.2138/am-2015-4850</span></a></p>
<ul><li>This source supplies useful information on the low temperature, high pressure environment in which these rocks formed. </li>
</ul><strong>Additional resources:<br /></strong>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. <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><br /><ul><li>Describes the petrogenesis of serpentine as seen in one of the items in the collection (Fr-4).</li>
</ul><p>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></p>
<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><p>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></p>
<ul><li>This article states that the europium anomalies of the greywacke samples suggest provenance from the Sierra Nevada batholith.</li>
</ul><p>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></p>
<ul><li><span>Using magnetic data, this article provides an overview of the regional structure of the Franciscan Complex.</span></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.
Purchased from Western Minerals, Inc.
-
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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.
<p><strong>Start here:<br /></strong>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. <a href="http://dx.doi.org/10.2138/am-2015-4850" target="_blank"><span>doi: </span><span class="slug-doi">10.2138/am-2015-4850</span></a></p>
<ul><li>This source supplies useful information on the low temperature, high pressure environment in which these rocks formed. </li>
</ul><strong>Additional resources:<br /></strong>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. <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><br /><ul><li>Describes the petrogenesis of serpentine as seen in one of the items in the collection (Fr-4).</li>
</ul><p>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></p>
<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><p>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></p>
<ul><li>This article states that the europium anomalies of the greywacke samples suggest provenance from the Sierra Nevada batholith.</li>
</ul><p>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></p>
<ul><li><span>Using magnetic data, this article provides an overview of the regional structure of the Franciscan Complex.</span></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.
Purchased from Western Minerals, Inc.
-
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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.
<p><strong>Start here:<br /></strong>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. <a href="http://dx.doi.org/10.2138/am-2015-4850" target="_blank"><span>doi: </span><span class="slug-doi">10.2138/am-2015-4850</span></a></p>
<ul><li>This source supplies useful information on the low temperature, high pressure environment in which these rocks formed. </li>
</ul><strong>Additional resources:<br /></strong>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. <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><br /><ul><li>Describes the petrogenesis of serpentine as seen in one of the items in the collection (Fr-4).</li>
</ul><p>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></p>
<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><p>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></p>
<ul><li>This article states that the europium anomalies of the greywacke samples suggest provenance from the Sierra Nevada batholith.</li>
</ul><p>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></p>
<ul><li><span>Using magnetic data, this article provides an overview of the regional structure of the Franciscan Complex.</span></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.
Purchased from Western Minerals, Inc.
-
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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.
<p><strong>Start here:<br /></strong>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. <a href="http://dx.doi.org/10.2138/am-2015-4850" target="_blank"><span>doi: </span><span class="slug-doi">10.2138/am-2015-4850</span></a></p>
<ul><li>This source supplies useful information on the low temperature, high pressure environment in which these rocks formed. </li>
</ul><strong>Additional resources:<br /></strong>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. <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><br /><ul><li>Describes the petrogenesis of serpentine as seen in one of the items in the collection (Fr-4).</li>
</ul><p>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></p>
<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><p>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></p>
<ul><li>This article states that the europium anomalies of the greywacke samples suggest provenance from the Sierra Nevada batholith.</li>
</ul><p>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></p>
<ul><li><span>Using magnetic data, this article provides an overview of the regional structure of the Franciscan Complex.</span></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.
Purchased from Western Minerals, Inc.
-
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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.
<p><strong>Start here:<br /></strong>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. <a href="http://dx.doi.org/10.2138/am-2015-4850" target="_blank"><span>doi: </span><span class="slug-doi">10.2138/am-2015-4850</span></a></p>
<ul><li>This source supplies useful information on the low temperature, high pressure environment in which these rocks formed. </li>
</ul><strong>Additional resources:<br /></strong>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. <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><br /><ul><li>Describes the petrogenesis of serpentine as seen in one of the items in the collection (Fr-4).</li>
</ul><p>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></p>
<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><p>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></p>
<ul><li>This article states that the europium anomalies of the greywacke samples suggest provenance from the Sierra Nevada batholith.</li>
</ul><p>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></p>
<ul><li><span>Using magnetic data, this article provides an overview of the regional structure of the Franciscan Complex.</span></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.
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-11
Spatial Coverage
Spatial characteristics of the resource.
Roadcut on west side of north Twin
Peaks.
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.
-
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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.
<p><strong>Start here:<br /></strong>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. <a href="http://dx.doi.org/10.2138/am-2015-4850" target="_blank"><span>doi: </span><span class="slug-doi">10.2138/am-2015-4850</span></a></p>
<ul><li>This source supplies useful information on the low temperature, high pressure environment in which these rocks formed. </li>
</ul><strong>Additional resources:<br /></strong>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. <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><br /><ul><li>Describes the petrogenesis of serpentine as seen in one of the items in the collection (Fr-4).</li>
</ul><p>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></p>
<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><p>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></p>
<ul><li>This article states that the europium anomalies of the greywacke samples suggest provenance from the Sierra Nevada batholith.</li>
</ul><p>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></p>
<ul><li><span>Using magnetic data, this article provides an overview of the regional structure of the Franciscan Complex.</span></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.
Purchased from Western Minerals, Inc.
-
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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.
<p><strong>Start here:<br /></strong>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. <a href="http://dx.doi.org/10.2138/am-2015-4850" target="_blank"><span>doi: </span><span class="slug-doi">10.2138/am-2015-4850</span></a></p>
<ul><li>This source supplies useful information on the low temperature, high pressure environment in which these rocks formed. </li>
</ul><strong>Additional resources:<br /></strong>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. <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><br /><ul><li>Describes the petrogenesis of serpentine as seen in one of the items in the collection (Fr-4).</li>
</ul><p>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></p>
<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><p>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></p>
<ul><li>This article states that the europium anomalies of the greywacke samples suggest provenance from the Sierra Nevada batholith.</li>
</ul><p>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></p>
<ul><li><span>Using magnetic data, this article provides an overview of the regional structure of the Franciscan Complex.</span></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.
-
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IPTC Array
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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
2468
Height
1652
Bit Depth
8
Channels
3
IPTC String
date_created:05.10.2013
IPTC Array
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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
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https://geosciencecollections.milne-library.org/files/original/6beb4148650461ac4075af8d079ab1f9.JPG
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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.
<p><strong>Start here:<br /></strong>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. <a href="http://dx.doi.org/10.2138/am-2015-4850" target="_blank"><span>doi: </span><span class="slug-doi">10.2138/am-2015-4850</span></a></p>
<ul><li>This source supplies useful information on the low temperature, high pressure environment in which these rocks formed. </li>
</ul><strong>Additional resources:<br /></strong>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. <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><br /><ul><li>Describes the petrogenesis of serpentine as seen in one of the items in the collection (Fr-4).</li>
</ul><p>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></p>
<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><p>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></p>
<ul><li>This article states that the europium anomalies of the greywacke samples suggest provenance from the Sierra Nevada batholith.</li>
</ul><p>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></p>
<ul><li><span>Using magnetic data, this article provides an overview of the regional structure of the Franciscan Complex.</span></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.