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                  <text>&lt;strong&gt;Start Here&lt;/strong&gt;:&lt;br /&gt;Blakey, R.C., and Middleton, L.T., 2012, Geologic history and paleogeography of paleozoic and early mesozoic sedimentary rocks, eastern Grand Canyon, Arizona: Geologic Society of America Bulletin, v. 489, pp. 81-92, doi: &lt;a href="%20http%3A//dx.doi.org/10.1130/2012.2489(05)"&gt;10.1130/2012.2489(05)&lt;/a&gt;&lt;br /&gt;&lt;a href="http://dx.doi.org/10.1130/2012.2489(05)%20" target="_blank"&gt;&lt;br /&gt;&lt;/a&gt;
&lt;ul&gt;&lt;li&gt;This reference outlines the stratigraphy found in this suite. It specifically highlights the paleozoic era in which the samples represent.Â &lt;/li&gt;
&lt;/ul&gt;&lt;br /&gt;&lt;strong&gt;Additional Resources:Â &lt;br /&gt;&lt;/strong&gt;Brown, E.H., Babcock, R.S., Clark, M.D., and Livingston, D.E., 1979,Â Geology of the older Precambrian rocks of the Grand Canyon Part I. Petrology and structure of the Vishnu Complex: Precambrian Research, v. 8, p. 219-241, doi:Â &lt;a href="http://dx.doi.org/10.1016/0301-9268(79)90030-5%20"&gt;10.1016/0301-9268(79)90030-5Â &lt;/a&gt;&lt;br /&gt;&lt;ul&gt;&lt;li&gt;Brown et al. begins this series of 3 articles outlining the geologic timescale and discusses the Vishnu complex and how it fits into the geologic timescale. It provides an explaination for several of the samples in this collection.Â &lt;/li&gt;
&lt;/ul&gt;
Brown, E.H., Babcock, R.S., Clark, M.D., and Livingston, D.E., 1979,Â Geology of the older Precambrian rocks of the Grand Canyon Part II. The Zoroaster Plutonic Complex and related rocks: Precambrian Research, v. 8, p. 243-275, doi&lt;span&gt;&lt;span&gt;:Â &lt;a href="http://dx.doi.org/10.1016/0301-9268(79)90031-7" target="_blank"&gt;10.1016/0301-9268(79)90031-7&lt;/a&gt;&lt;br /&gt;&lt;/span&gt;&lt;/span&gt;
&lt;ul&gt;&lt;li&gt;In the second part of the article, the authors discuss the importance of the pluton and how it affected the formation of the stratigraphic profile of the grand canyon.Â &lt;/li&gt;
&lt;/ul&gt;
Clark, M.D., 1979,Â Geology of the older Precambrian rocks of the Grand Canyon. Part III. Petrology of mafic schists and amphibolites: Precambrian Research, v. 8, p. 277-302, doi&lt;span&gt;&lt;span&gt;:Â &lt;a href="http://dx.doi.org/10.1016/0301-9268(79)90032-9" target="_blank"&gt;10.1016/0301-9268(79)90032-9&lt;/a&gt;&lt;br /&gt;&lt;/span&gt;&lt;/span&gt;
&lt;ul&gt;&lt;li&gt;The final section of this discussion set provides insight into the mafic layers of the stratigraphic column.Â &lt;/li&gt;
&lt;/ul&gt;
Ilg, B.R., Karlstrom, K.E., Hawkins, D.P., and Williams, M.L., 1996,Â Tectonic evolution of Paleoproterozoic rocks in the Grand Canyon: Insights into middle-crustal processes:Â Bulletin of the Geological Society of America, v. 108, p. 1149-1166, doi&lt;span&gt;&lt;span&gt;:Â &lt;a href="http://dx.doi.org/10.1130/0016-7606(1996)108" target="_blank"&gt;10.1130/0016-7606(1996)108&lt;/a&gt;&lt;br /&gt;&lt;/span&gt;&lt;/span&gt;
&lt;ul&gt;&lt;li&gt;This is a general look into the formation of the stratigraphic layers. This article does a good job combining the above articles into one condensed summary.Â &lt;/li&gt;
&lt;/ul&gt;</text>
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Williams, Coconino Co., Arizona</text>
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                  <text>&lt;strong&gt;Start Here&lt;/strong&gt;:&lt;br /&gt;Blakey, R.C., and Middleton, L.T., 2012, Geologic history and paleogeography of paleozoic and early mesozoic sedimentary rocks, eastern Grand Canyon, Arizona: Geologic Society of America Bulletin, v. 489, pp. 81-92, doi: &lt;a href="%20http%3A//dx.doi.org/10.1130/2012.2489(05)"&gt;10.1130/2012.2489(05)&lt;/a&gt;&lt;br /&gt;&lt;a href="http://dx.doi.org/10.1130/2012.2489(05)%20" target="_blank"&gt;&lt;br /&gt;&lt;/a&gt;
&lt;ul&gt;&lt;li&gt;This reference outlines the stratigraphy found in this suite. It specifically highlights the paleozoic era in which the samples represent.Â &lt;/li&gt;
&lt;/ul&gt;&lt;br /&gt;&lt;strong&gt;Additional Resources:Â &lt;br /&gt;&lt;/strong&gt;Brown, E.H., Babcock, R.S., Clark, M.D., and Livingston, D.E., 1979,Â Geology of the older Precambrian rocks of the Grand Canyon Part I. Petrology and structure of the Vishnu Complex: Precambrian Research, v. 8, p. 219-241, doi:Â &lt;a href="http://dx.doi.org/10.1016/0301-9268(79)90030-5%20"&gt;10.1016/0301-9268(79)90030-5Â &lt;/a&gt;&lt;br /&gt;&lt;ul&gt;&lt;li&gt;Brown et al. begins this series of 3 articles outlining the geologic timescale and discusses the Vishnu complex and how it fits into the geologic timescale. It provides an explaination for several of the samples in this collection.Â &lt;/li&gt;
&lt;/ul&gt;
Brown, E.H., Babcock, R.S., Clark, M.D., and Livingston, D.E., 1979,Â Geology of the older Precambrian rocks of the Grand Canyon Part II. The Zoroaster Plutonic Complex and related rocks: Precambrian Research, v. 8, p. 243-275, doi&lt;span&gt;&lt;span&gt;:Â &lt;a href="http://dx.doi.org/10.1016/0301-9268(79)90031-7" target="_blank"&gt;10.1016/0301-9268(79)90031-7&lt;/a&gt;&lt;br /&gt;&lt;/span&gt;&lt;/span&gt;
&lt;ul&gt;&lt;li&gt;In the second part of the article, the authors discuss the importance of the pluton and how it affected the formation of the stratigraphic profile of the grand canyon.Â &lt;/li&gt;
&lt;/ul&gt;
Clark, M.D., 1979,Â Geology of the older Precambrian rocks of the Grand Canyon. Part III. Petrology of mafic schists and amphibolites: Precambrian Research, v. 8, p. 277-302, doi&lt;span&gt;&lt;span&gt;:Â &lt;a href="http://dx.doi.org/10.1016/0301-9268(79)90032-9" target="_blank"&gt;10.1016/0301-9268(79)90032-9&lt;/a&gt;&lt;br /&gt;&lt;/span&gt;&lt;/span&gt;
&lt;ul&gt;&lt;li&gt;The final section of this discussion set provides insight into the mafic layers of the stratigraphic column.Â &lt;/li&gt;
&lt;/ul&gt;
Ilg, B.R., Karlstrom, K.E., Hawkins, D.P., and Williams, M.L., 1996,Â Tectonic evolution of Paleoproterozoic rocks in the Grand Canyon: Insights into middle-crustal processes:Â Bulletin of the Geological Society of America, v. 108, p. 1149-1166, doi&lt;span&gt;&lt;span&gt;:Â &lt;a href="http://dx.doi.org/10.1130/0016-7606(1996)108" target="_blank"&gt;10.1130/0016-7606(1996)108&lt;/a&gt;&lt;br /&gt;&lt;/span&gt;&lt;/span&gt;
&lt;ul&gt;&lt;li&gt;This is a general look into the formation of the stratigraphic layers. This article does a good job combining the above articles into one condensed summary.Â &lt;/li&gt;
&lt;/ul&gt;</text>
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                  <text>&lt;strong&gt;Start Here&lt;/strong&gt;:&lt;br /&gt;Blakey, R.C., and Middleton, L.T., 2012, Geologic history and paleogeography of paleozoic and early mesozoic sedimentary rocks, eastern Grand Canyon, Arizona: Geologic Society of America Bulletin, v. 489, pp. 81-92, doi: &lt;a href="%20http%3A//dx.doi.org/10.1130/2012.2489(05)"&gt;10.1130/2012.2489(05)&lt;/a&gt;&lt;br /&gt;&lt;a href="http://dx.doi.org/10.1130/2012.2489(05)%20" target="_blank"&gt;&lt;br /&gt;&lt;/a&gt;
&lt;ul&gt;&lt;li&gt;This reference outlines the stratigraphy found in this suite. It specifically highlights the paleozoic era in which the samples represent.Â &lt;/li&gt;
&lt;/ul&gt;&lt;br /&gt;&lt;strong&gt;Additional Resources:Â &lt;br /&gt;&lt;/strong&gt;Brown, E.H., Babcock, R.S., Clark, M.D., and Livingston, D.E., 1979,Â Geology of the older Precambrian rocks of the Grand Canyon Part I. Petrology and structure of the Vishnu Complex: Precambrian Research, v. 8, p. 219-241, doi:Â &lt;a href="http://dx.doi.org/10.1016/0301-9268(79)90030-5%20"&gt;10.1016/0301-9268(79)90030-5Â &lt;/a&gt;&lt;br /&gt;&lt;ul&gt;&lt;li&gt;Brown et al. begins this series of 3 articles outlining the geologic timescale and discusses the Vishnu complex and how it fits into the geologic timescale. It provides an explaination for several of the samples in this collection.Â &lt;/li&gt;
&lt;/ul&gt;
Brown, E.H., Babcock, R.S., Clark, M.D., and Livingston, D.E., 1979,Â Geology of the older Precambrian rocks of the Grand Canyon Part II. The Zoroaster Plutonic Complex and related rocks: Precambrian Research, v. 8, p. 243-275, doi&lt;span&gt;&lt;span&gt;:Â &lt;a href="http://dx.doi.org/10.1016/0301-9268(79)90031-7" target="_blank"&gt;10.1016/0301-9268(79)90031-7&lt;/a&gt;&lt;br /&gt;&lt;/span&gt;&lt;/span&gt;
&lt;ul&gt;&lt;li&gt;In the second part of the article, the authors discuss the importance of the pluton and how it affected the formation of the stratigraphic profile of the grand canyon.Â &lt;/li&gt;
&lt;/ul&gt;
Clark, M.D., 1979,Â Geology of the older Precambrian rocks of the Grand Canyon. Part III. Petrology of mafic schists and amphibolites: Precambrian Research, v. 8, p. 277-302, doi&lt;span&gt;&lt;span&gt;:Â &lt;a href="http://dx.doi.org/10.1016/0301-9268(79)90032-9" target="_blank"&gt;10.1016/0301-9268(79)90032-9&lt;/a&gt;&lt;br /&gt;&lt;/span&gt;&lt;/span&gt;
&lt;ul&gt;&lt;li&gt;The final section of this discussion set provides insight into the mafic layers of the stratigraphic column.Â &lt;/li&gt;
&lt;/ul&gt;
Ilg, B.R., Karlstrom, K.E., Hawkins, D.P., and Williams, M.L., 1996,Â Tectonic evolution of Paleoproterozoic rocks in the Grand Canyon: Insights into middle-crustal processes:Â Bulletin of the Geological Society of America, v. 108, p. 1149-1166, doi&lt;span&gt;&lt;span&gt;:Â &lt;a href="http://dx.doi.org/10.1130/0016-7606(1996)108" target="_blank"&gt;10.1130/0016-7606(1996)108&lt;/a&gt;&lt;br /&gt;&lt;/span&gt;&lt;/span&gt;
&lt;ul&gt;&lt;li&gt;This is a general look into the formation of the stratigraphic layers. This article does a good job combining the above articles into one condensed summary.Â &lt;/li&gt;
&lt;/ul&gt;</text>
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Seligman, Ysvupai Co., Arizona &#13;
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                  <text>&lt;strong&gt;Start Here&lt;/strong&gt;:&lt;br /&gt;Blakey, R.C., and Middleton, L.T., 2012, Geologic history and paleogeography of paleozoic and early mesozoic sedimentary rocks, eastern Grand Canyon, Arizona: Geologic Society of America Bulletin, v. 489, pp. 81-92, doi: &lt;a href="%20http%3A//dx.doi.org/10.1130/2012.2489(05)"&gt;10.1130/2012.2489(05)&lt;/a&gt;&lt;br /&gt;&lt;a href="http://dx.doi.org/10.1130/2012.2489(05)%20" target="_blank"&gt;&lt;br /&gt;&lt;/a&gt;
&lt;ul&gt;&lt;li&gt;This reference outlines the stratigraphy found in this suite. It specifically highlights the paleozoic era in which the samples represent.Â &lt;/li&gt;
&lt;/ul&gt;&lt;br /&gt;&lt;strong&gt;Additional Resources:Â &lt;br /&gt;&lt;/strong&gt;Brown, E.H., Babcock, R.S., Clark, M.D., and Livingston, D.E., 1979,Â Geology of the older Precambrian rocks of the Grand Canyon Part I. Petrology and structure of the Vishnu Complex: Precambrian Research, v. 8, p. 219-241, doi:Â &lt;a href="http://dx.doi.org/10.1016/0301-9268(79)90030-5%20"&gt;10.1016/0301-9268(79)90030-5Â &lt;/a&gt;&lt;br /&gt;&lt;ul&gt;&lt;li&gt;Brown et al. begins this series of 3 articles outlining the geologic timescale and discusses the Vishnu complex and how it fits into the geologic timescale. It provides an explaination for several of the samples in this collection.Â &lt;/li&gt;
&lt;/ul&gt;
Brown, E.H., Babcock, R.S., Clark, M.D., and Livingston, D.E., 1979,Â Geology of the older Precambrian rocks of the Grand Canyon Part II. The Zoroaster Plutonic Complex and related rocks: Precambrian Research, v. 8, p. 243-275, doi&lt;span&gt;&lt;span&gt;:Â &lt;a href="http://dx.doi.org/10.1016/0301-9268(79)90031-7" target="_blank"&gt;10.1016/0301-9268(79)90031-7&lt;/a&gt;&lt;br /&gt;&lt;/span&gt;&lt;/span&gt;
&lt;ul&gt;&lt;li&gt;In the second part of the article, the authors discuss the importance of the pluton and how it affected the formation of the stratigraphic profile of the grand canyon.Â &lt;/li&gt;
&lt;/ul&gt;
Clark, M.D., 1979,Â Geology of the older Precambrian rocks of the Grand Canyon. Part III. Petrology of mafic schists and amphibolites: Precambrian Research, v. 8, p. 277-302, doi&lt;span&gt;&lt;span&gt;:Â &lt;a href="http://dx.doi.org/10.1016/0301-9268(79)90032-9" target="_blank"&gt;10.1016/0301-9268(79)90032-9&lt;/a&gt;&lt;br /&gt;&lt;/span&gt;&lt;/span&gt;
&lt;ul&gt;&lt;li&gt;The final section of this discussion set provides insight into the mafic layers of the stratigraphic column.Â &lt;/li&gt;
&lt;/ul&gt;
Ilg, B.R., Karlstrom, K.E., Hawkins, D.P., and Williams, M.L., 1996,Â Tectonic evolution of Paleoproterozoic rocks in the Grand Canyon: Insights into middle-crustal processes:Â Bulletin of the Geological Society of America, v. 108, p. 1149-1166, doi&lt;span&gt;&lt;span&gt;:Â &lt;a href="http://dx.doi.org/10.1130/0016-7606(1996)108" target="_blank"&gt;10.1130/0016-7606(1996)108&lt;/a&gt;&lt;br /&gt;&lt;/span&gt;&lt;/span&gt;
&lt;ul&gt;&lt;li&gt;This is a general look into the formation of the stratigraphic layers. This article does a good job combining the above articles into one condensed summary.Â &lt;/li&gt;
&lt;/ul&gt;</text>
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                  <text>&lt;strong&gt;Start Here&lt;/strong&gt;:&lt;br /&gt;Blakey, R.C., and Middleton, L.T., 2012, Geologic history and paleogeography of paleozoic and early mesozoic sedimentary rocks, eastern Grand Canyon, Arizona: Geologic Society of America Bulletin, v. 489, pp. 81-92, doi: &lt;a href="%20http%3A//dx.doi.org/10.1130/2012.2489(05)"&gt;10.1130/2012.2489(05)&lt;/a&gt;&lt;br /&gt;&lt;a href="http://dx.doi.org/10.1130/2012.2489(05)%20" target="_blank"&gt;&lt;br /&gt;&lt;/a&gt;
&lt;ul&gt;&lt;li&gt;This reference outlines the stratigraphy found in this suite. It specifically highlights the paleozoic era in which the samples represent.Â &lt;/li&gt;
&lt;/ul&gt;&lt;br /&gt;&lt;strong&gt;Additional Resources:Â &lt;br /&gt;&lt;/strong&gt;Brown, E.H., Babcock, R.S., Clark, M.D., and Livingston, D.E., 1979,Â Geology of the older Precambrian rocks of the Grand Canyon Part I. Petrology and structure of the Vishnu Complex: Precambrian Research, v. 8, p. 219-241, doi:Â &lt;a href="http://dx.doi.org/10.1016/0301-9268(79)90030-5%20"&gt;10.1016/0301-9268(79)90030-5Â &lt;/a&gt;&lt;br /&gt;&lt;ul&gt;&lt;li&gt;Brown et al. begins this series of 3 articles outlining the geologic timescale and discusses the Vishnu complex and how it fits into the geologic timescale. It provides an explaination for several of the samples in this collection.Â &lt;/li&gt;
&lt;/ul&gt;
Brown, E.H., Babcock, R.S., Clark, M.D., and Livingston, D.E., 1979,Â Geology of the older Precambrian rocks of the Grand Canyon Part II. The Zoroaster Plutonic Complex and related rocks: Precambrian Research, v. 8, p. 243-275, doi&lt;span&gt;&lt;span&gt;:Â &lt;a href="http://dx.doi.org/10.1016/0301-9268(79)90031-7" target="_blank"&gt;10.1016/0301-9268(79)90031-7&lt;/a&gt;&lt;br /&gt;&lt;/span&gt;&lt;/span&gt;
&lt;ul&gt;&lt;li&gt;In the second part of the article, the authors discuss the importance of the pluton and how it affected the formation of the stratigraphic profile of the grand canyon.Â &lt;/li&gt;
&lt;/ul&gt;
Clark, M.D., 1979,Â Geology of the older Precambrian rocks of the Grand Canyon. Part III. Petrology of mafic schists and amphibolites: Precambrian Research, v. 8, p. 277-302, doi&lt;span&gt;&lt;span&gt;:Â &lt;a href="http://dx.doi.org/10.1016/0301-9268(79)90032-9" target="_blank"&gt;10.1016/0301-9268(79)90032-9&lt;/a&gt;&lt;br /&gt;&lt;/span&gt;&lt;/span&gt;
&lt;ul&gt;&lt;li&gt;The final section of this discussion set provides insight into the mafic layers of the stratigraphic column.Â &lt;/li&gt;
&lt;/ul&gt;
Ilg, B.R., Karlstrom, K.E., Hawkins, D.P., and Williams, M.L., 1996,Â Tectonic evolution of Paleoproterozoic rocks in the Grand Canyon: Insights into middle-crustal processes:Â Bulletin of the Geological Society of America, v. 108, p. 1149-1166, doi&lt;span&gt;&lt;span&gt;:Â &lt;a href="http://dx.doi.org/10.1130/0016-7606(1996)108" target="_blank"&gt;10.1130/0016-7606(1996)108&lt;/a&gt;&lt;br /&gt;&lt;/span&gt;&lt;/span&gt;
&lt;ul&gt;&lt;li&gt;This is a general look into the formation of the stratigraphic layers. This article does a good job combining the above articles into one condensed summary.Â &lt;/li&gt;
&lt;/ul&gt;</text>
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                  <text>Peach Springs, Mohave Co., Arizona&#13;
Peach Springs, Coconino Co., Arizona&#13;
Seligman, Ysvupai Co., Arizona &#13;
Williams, Coconino Co., Arizona</text>
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                <text>&lt;a href="http://www.geosciencecollections.milne-library.org/items/show/1"&gt;Grand Canyon Western Minerals Supplementary Information&lt;/a&gt;</text>
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                <text>This sample is mis-labeled as a pegmatite.  It is really a porphyritic dike material that cuts through the Zoroaster Granite.   The phenocrysts are hornblende.</text>
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                  <text>This collection contains 21 samples. They are a representation of samples of lithology from the early precambrian to the late permian. The stratigraphic sequence contains a variety of rocks including, but not limited to schist, limestone, and sandstone. These specimens are representative of the geologic section in the Grand Canyon, but no specimens were collected within the boundaries of the National Park. </text>
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                  <text>&lt;strong&gt;Start Here&lt;/strong&gt;:&lt;br /&gt;Blakey, R.C., and Middleton, L.T., 2012, Geologic history and paleogeography of paleozoic and early mesozoic sedimentary rocks, eastern Grand Canyon, Arizona: Geologic Society of America Bulletin, v. 489, pp. 81-92, doi: &lt;a href="%20http%3A//dx.doi.org/10.1130/2012.2489(05)"&gt;10.1130/2012.2489(05)&lt;/a&gt;&lt;br /&gt;&lt;a href="http://dx.doi.org/10.1130/2012.2489(05)%20" target="_blank"&gt;&lt;br /&gt;&lt;/a&gt;
&lt;ul&gt;&lt;li&gt;This reference outlines the stratigraphy found in this suite. It specifically highlights the paleozoic era in which the samples represent.Â &lt;/li&gt;
&lt;/ul&gt;&lt;br /&gt;&lt;strong&gt;Additional Resources:Â &lt;br /&gt;&lt;/strong&gt;Brown, E.H., Babcock, R.S., Clark, M.D., and Livingston, D.E., 1979,Â Geology of the older Precambrian rocks of the Grand Canyon Part I. Petrology and structure of the Vishnu Complex: Precambrian Research, v. 8, p. 219-241, doi:Â &lt;a href="http://dx.doi.org/10.1016/0301-9268(79)90030-5%20"&gt;10.1016/0301-9268(79)90030-5Â &lt;/a&gt;&lt;br /&gt;&lt;ul&gt;&lt;li&gt;Brown et al. begins this series of 3 articles outlining the geologic timescale and discusses the Vishnu complex and how it fits into the geologic timescale. It provides an explaination for several of the samples in this collection.Â &lt;/li&gt;
&lt;/ul&gt;
Brown, E.H., Babcock, R.S., Clark, M.D., and Livingston, D.E., 1979,Â Geology of the older Precambrian rocks of the Grand Canyon Part II. The Zoroaster Plutonic Complex and related rocks: Precambrian Research, v. 8, p. 243-275, doi&lt;span&gt;&lt;span&gt;:Â &lt;a href="http://dx.doi.org/10.1016/0301-9268(79)90031-7" target="_blank"&gt;10.1016/0301-9268(79)90031-7&lt;/a&gt;&lt;br /&gt;&lt;/span&gt;&lt;/span&gt;
&lt;ul&gt;&lt;li&gt;In the second part of the article, the authors discuss the importance of the pluton and how it affected the formation of the stratigraphic profile of the grand canyon.Â &lt;/li&gt;
&lt;/ul&gt;
Clark, M.D., 1979,Â Geology of the older Precambrian rocks of the Grand Canyon. Part III. Petrology of mafic schists and amphibolites: Precambrian Research, v. 8, p. 277-302, doi&lt;span&gt;&lt;span&gt;:Â &lt;a href="http://dx.doi.org/10.1016/0301-9268(79)90032-9" target="_blank"&gt;10.1016/0301-9268(79)90032-9&lt;/a&gt;&lt;br /&gt;&lt;/span&gt;&lt;/span&gt;
&lt;ul&gt;&lt;li&gt;The final section of this discussion set provides insight into the mafic layers of the stratigraphic column.Â &lt;/li&gt;
&lt;/ul&gt;
Ilg, B.R., Karlstrom, K.E., Hawkins, D.P., and Williams, M.L., 1996,Â Tectonic evolution of Paleoproterozoic rocks in the Grand Canyon: Insights into middle-crustal processes:Â Bulletin of the Geological Society of America, v. 108, p. 1149-1166, doi&lt;span&gt;&lt;span&gt;:Â &lt;a href="http://dx.doi.org/10.1130/0016-7606(1996)108" target="_blank"&gt;10.1130/0016-7606(1996)108&lt;/a&gt;&lt;br /&gt;&lt;/span&gt;&lt;/span&gt;
&lt;ul&gt;&lt;li&gt;This is a general look into the formation of the stratigraphic layers. This article does a good job combining the above articles into one condensed summary.Â &lt;/li&gt;
&lt;/ul&gt;</text>
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Peach Springs, Coconino Co., Arizona&#13;
Seligman, Ysvupai Co., Arizona &#13;
Williams, Coconino Co., Arizona</text>
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                <text>&lt;a href="http://www.geosciencecollections.milne-library.org/items/show/1"&gt;Grand Canyon Western Minerals Supplementary Information&lt;/a&gt;</text>
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                  <text>&lt;strong&gt;Start Here&lt;/strong&gt;:&lt;br /&gt;Blakey, R.C., and Middleton, L.T., 2012, Geologic history and paleogeography of paleozoic and early mesozoic sedimentary rocks, eastern Grand Canyon, Arizona: Geologic Society of America Bulletin, v. 489, pp. 81-92, doi: &lt;a href="%20http%3A//dx.doi.org/10.1130/2012.2489(05)"&gt;10.1130/2012.2489(05)&lt;/a&gt;&lt;br /&gt;&lt;a href="http://dx.doi.org/10.1130/2012.2489(05)%20" target="_blank"&gt;&lt;br /&gt;&lt;/a&gt;
&lt;ul&gt;&lt;li&gt;This reference outlines the stratigraphy found in this suite. It specifically highlights the paleozoic era in which the samples represent.Â &lt;/li&gt;
&lt;/ul&gt;&lt;br /&gt;&lt;strong&gt;Additional Resources:Â &lt;br /&gt;&lt;/strong&gt;Brown, E.H., Babcock, R.S., Clark, M.D., and Livingston, D.E., 1979,Â Geology of the older Precambrian rocks of the Grand Canyon Part I. Petrology and structure of the Vishnu Complex: Precambrian Research, v. 8, p. 219-241, doi:Â &lt;a href="http://dx.doi.org/10.1016/0301-9268(79)90030-5%20"&gt;10.1016/0301-9268(79)90030-5Â &lt;/a&gt;&lt;br /&gt;&lt;ul&gt;&lt;li&gt;Brown et al. begins this series of 3 articles outlining the geologic timescale and discusses the Vishnu complex and how it fits into the geologic timescale. It provides an explaination for several of the samples in this collection.Â &lt;/li&gt;
&lt;/ul&gt;
Brown, E.H., Babcock, R.S., Clark, M.D., and Livingston, D.E., 1979,Â Geology of the older Precambrian rocks of the Grand Canyon Part II. The Zoroaster Plutonic Complex and related rocks: Precambrian Research, v. 8, p. 243-275, doi&lt;span&gt;&lt;span&gt;:Â &lt;a href="http://dx.doi.org/10.1016/0301-9268(79)90031-7" target="_blank"&gt;10.1016/0301-9268(79)90031-7&lt;/a&gt;&lt;br /&gt;&lt;/span&gt;&lt;/span&gt;
&lt;ul&gt;&lt;li&gt;In the second part of the article, the authors discuss the importance of the pluton and how it affected the formation of the stratigraphic profile of the grand canyon.Â &lt;/li&gt;
&lt;/ul&gt;
Clark, M.D., 1979,Â Geology of the older Precambrian rocks of the Grand Canyon. Part III. Petrology of mafic schists and amphibolites: Precambrian Research, v. 8, p. 277-302, doi&lt;span&gt;&lt;span&gt;:Â &lt;a href="http://dx.doi.org/10.1016/0301-9268(79)90032-9" target="_blank"&gt;10.1016/0301-9268(79)90032-9&lt;/a&gt;&lt;br /&gt;&lt;/span&gt;&lt;/span&gt;
&lt;ul&gt;&lt;li&gt;The final section of this discussion set provides insight into the mafic layers of the stratigraphic column.Â &lt;/li&gt;
&lt;/ul&gt;
Ilg, B.R., Karlstrom, K.E., Hawkins, D.P., and Williams, M.L., 1996,Â Tectonic evolution of Paleoproterozoic rocks in the Grand Canyon: Insights into middle-crustal processes:Â Bulletin of the Geological Society of America, v. 108, p. 1149-1166, doi&lt;span&gt;&lt;span&gt;:Â &lt;a href="http://dx.doi.org/10.1130/0016-7606(1996)108" target="_blank"&gt;10.1130/0016-7606(1996)108&lt;/a&gt;&lt;br /&gt;&lt;/span&gt;&lt;/span&gt;
&lt;ul&gt;&lt;li&gt;This is a general look into the formation of the stratigraphic layers. This article does a good job combining the above articles into one condensed summary.Â &lt;/li&gt;
&lt;/ul&gt;</text>
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Seligman, Ysvupai Co., Arizona &#13;
Williams, Coconino Co., Arizona</text>
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                  <text>&lt;strong&gt;Start Here&lt;/strong&gt;:&lt;br /&gt;Blakey, R.C., and Middleton, L.T., 2012, Geologic history and paleogeography of paleozoic and early mesozoic sedimentary rocks, eastern Grand Canyon, Arizona: Geologic Society of America Bulletin, v. 489, pp. 81-92, doi: &lt;a href="%20http%3A//dx.doi.org/10.1130/2012.2489(05)"&gt;10.1130/2012.2489(05)&lt;/a&gt;&lt;br /&gt;&lt;a href="http://dx.doi.org/10.1130/2012.2489(05)%20" target="_blank"&gt;&lt;br /&gt;&lt;/a&gt;
&lt;ul&gt;&lt;li&gt;This reference outlines the stratigraphy found in this suite. It specifically highlights the paleozoic era in which the samples represent.Â &lt;/li&gt;
&lt;/ul&gt;&lt;br /&gt;&lt;strong&gt;Additional Resources:Â &lt;br /&gt;&lt;/strong&gt;Brown, E.H., Babcock, R.S., Clark, M.D., and Livingston, D.E., 1979,Â Geology of the older Precambrian rocks of the Grand Canyon Part I. Petrology and structure of the Vishnu Complex: Precambrian Research, v. 8, p. 219-241, doi:Â &lt;a href="http://dx.doi.org/10.1016/0301-9268(79)90030-5%20"&gt;10.1016/0301-9268(79)90030-5Â &lt;/a&gt;&lt;br /&gt;&lt;ul&gt;&lt;li&gt;Brown et al. begins this series of 3 articles outlining the geologic timescale and discusses the Vishnu complex and how it fits into the geologic timescale. It provides an explaination for several of the samples in this collection.Â &lt;/li&gt;
&lt;/ul&gt;
Brown, E.H., Babcock, R.S., Clark, M.D., and Livingston, D.E., 1979,Â Geology of the older Precambrian rocks of the Grand Canyon Part II. The Zoroaster Plutonic Complex and related rocks: Precambrian Research, v. 8, p. 243-275, doi&lt;span&gt;&lt;span&gt;:Â &lt;a href="http://dx.doi.org/10.1016/0301-9268(79)90031-7" target="_blank"&gt;10.1016/0301-9268(79)90031-7&lt;/a&gt;&lt;br /&gt;&lt;/span&gt;&lt;/span&gt;
&lt;ul&gt;&lt;li&gt;In the second part of the article, the authors discuss the importance of the pluton and how it affected the formation of the stratigraphic profile of the grand canyon.Â &lt;/li&gt;
&lt;/ul&gt;
Clark, M.D., 1979,Â Geology of the older Precambrian rocks of the Grand Canyon. Part III. Petrology of mafic schists and amphibolites: Precambrian Research, v. 8, p. 277-302, doi&lt;span&gt;&lt;span&gt;:Â &lt;a href="http://dx.doi.org/10.1016/0301-9268(79)90032-9" target="_blank"&gt;10.1016/0301-9268(79)90032-9&lt;/a&gt;&lt;br /&gt;&lt;/span&gt;&lt;/span&gt;
&lt;ul&gt;&lt;li&gt;The final section of this discussion set provides insight into the mafic layers of the stratigraphic column.Â &lt;/li&gt;
&lt;/ul&gt;
Ilg, B.R., Karlstrom, K.E., Hawkins, D.P., and Williams, M.L., 1996,Â Tectonic evolution of Paleoproterozoic rocks in the Grand Canyon: Insights into middle-crustal processes:Â Bulletin of the Geological Society of America, v. 108, p. 1149-1166, doi&lt;span&gt;&lt;span&gt;:Â &lt;a href="http://dx.doi.org/10.1130/0016-7606(1996)108" target="_blank"&gt;10.1130/0016-7606(1996)108&lt;/a&gt;&lt;br /&gt;&lt;/span&gt;&lt;/span&gt;
&lt;ul&gt;&lt;li&gt;This is a general look into the formation of the stratigraphic layers. This article does a good job combining the above articles into one condensed summary.Â &lt;/li&gt;
&lt;/ul&gt;</text>
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                  <text>&lt;strong&gt;Start Here&lt;/strong&gt;:&lt;br /&gt;Blakey, R.C., and Middleton, L.T., 2012, Geologic history and paleogeography of paleozoic and early mesozoic sedimentary rocks, eastern Grand Canyon, Arizona: Geologic Society of America Bulletin, v. 489, pp. 81-92, doi: &lt;a href="%20http%3A//dx.doi.org/10.1130/2012.2489(05)"&gt;10.1130/2012.2489(05)&lt;/a&gt;&lt;br /&gt;&lt;a href="http://dx.doi.org/10.1130/2012.2489(05)%20" target="_blank"&gt;&lt;br /&gt;&lt;/a&gt;
&lt;ul&gt;&lt;li&gt;This reference outlines the stratigraphy found in this suite. It specifically highlights the paleozoic era in which the samples represent.Â &lt;/li&gt;
&lt;/ul&gt;&lt;br /&gt;&lt;strong&gt;Additional Resources:Â &lt;br /&gt;&lt;/strong&gt;Brown, E.H., Babcock, R.S., Clark, M.D., and Livingston, D.E., 1979,Â Geology of the older Precambrian rocks of the Grand Canyon Part I. Petrology and structure of the Vishnu Complex: Precambrian Research, v. 8, p. 219-241, doi:Â &lt;a href="http://dx.doi.org/10.1016/0301-9268(79)90030-5%20"&gt;10.1016/0301-9268(79)90030-5Â &lt;/a&gt;&lt;br /&gt;&lt;ul&gt;&lt;li&gt;Brown et al. begins this series of 3 articles outlining the geologic timescale and discusses the Vishnu complex and how it fits into the geologic timescale. It provides an explaination for several of the samples in this collection.Â &lt;/li&gt;
&lt;/ul&gt;
Brown, E.H., Babcock, R.S., Clark, M.D., and Livingston, D.E., 1979,Â Geology of the older Precambrian rocks of the Grand Canyon Part II. The Zoroaster Plutonic Complex and related rocks: Precambrian Research, v. 8, p. 243-275, doi&lt;span&gt;&lt;span&gt;:Â &lt;a href="http://dx.doi.org/10.1016/0301-9268(79)90031-7" target="_blank"&gt;10.1016/0301-9268(79)90031-7&lt;/a&gt;&lt;br /&gt;&lt;/span&gt;&lt;/span&gt;
&lt;ul&gt;&lt;li&gt;In the second part of the article, the authors discuss the importance of the pluton and how it affected the formation of the stratigraphic profile of the grand canyon.Â &lt;/li&gt;
&lt;/ul&gt;
Clark, M.D., 1979,Â Geology of the older Precambrian rocks of the Grand Canyon. Part III. Petrology of mafic schists and amphibolites: Precambrian Research, v. 8, p. 277-302, doi&lt;span&gt;&lt;span&gt;:Â &lt;a href="http://dx.doi.org/10.1016/0301-9268(79)90032-9" target="_blank"&gt;10.1016/0301-9268(79)90032-9&lt;/a&gt;&lt;br /&gt;&lt;/span&gt;&lt;/span&gt;
&lt;ul&gt;&lt;li&gt;The final section of this discussion set provides insight into the mafic layers of the stratigraphic column.Â &lt;/li&gt;
&lt;/ul&gt;
Ilg, B.R., Karlstrom, K.E., Hawkins, D.P., and Williams, M.L., 1996,Â Tectonic evolution of Paleoproterozoic rocks in the Grand Canyon: Insights into middle-crustal processes:Â Bulletin of the Geological Society of America, v. 108, p. 1149-1166, doi&lt;span&gt;&lt;span&gt;:Â &lt;a href="http://dx.doi.org/10.1130/0016-7606(1996)108" target="_blank"&gt;10.1130/0016-7606(1996)108&lt;/a&gt;&lt;br /&gt;&lt;/span&gt;&lt;/span&gt;
&lt;ul&gt;&lt;li&gt;This is a general look into the formation of the stratigraphic layers. This article does a good job combining the above articles into one condensed summary.Â &lt;/li&gt;
&lt;/ul&gt;</text>
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                  <text>&lt;strong&gt;Start Here&lt;/strong&gt;:&lt;br /&gt;Blakey, R.C., and Middleton, L.T., 2012, Geologic history and paleogeography of paleozoic and early mesozoic sedimentary rocks, eastern Grand Canyon, Arizona: Geologic Society of America Bulletin, v. 489, pp. 81-92, doi: &lt;a href="%20http%3A//dx.doi.org/10.1130/2012.2489(05)"&gt;10.1130/2012.2489(05)&lt;/a&gt;&lt;br /&gt;&lt;a href="http://dx.doi.org/10.1130/2012.2489(05)%20" target="_blank"&gt;&lt;br /&gt;&lt;/a&gt;
&lt;ul&gt;&lt;li&gt;This reference outlines the stratigraphy found in this suite. It specifically highlights the paleozoic era in which the samples represent.Â &lt;/li&gt;
&lt;/ul&gt;&lt;br /&gt;&lt;strong&gt;Additional Resources:Â &lt;br /&gt;&lt;/strong&gt;Brown, E.H., Babcock, R.S., Clark, M.D., and Livingston, D.E., 1979,Â Geology of the older Precambrian rocks of the Grand Canyon Part I. Petrology and structure of the Vishnu Complex: Precambrian Research, v. 8, p. 219-241, doi:Â &lt;a href="http://dx.doi.org/10.1016/0301-9268(79)90030-5%20"&gt;10.1016/0301-9268(79)90030-5Â &lt;/a&gt;&lt;br /&gt;&lt;ul&gt;&lt;li&gt;Brown et al. begins this series of 3 articles outlining the geologic timescale and discusses the Vishnu complex and how it fits into the geologic timescale. It provides an explaination for several of the samples in this collection.Â &lt;/li&gt;
&lt;/ul&gt;
Brown, E.H., Babcock, R.S., Clark, M.D., and Livingston, D.E., 1979,Â Geology of the older Precambrian rocks of the Grand Canyon Part II. The Zoroaster Plutonic Complex and related rocks: Precambrian Research, v. 8, p. 243-275, doi&lt;span&gt;&lt;span&gt;:Â &lt;a href="http://dx.doi.org/10.1016/0301-9268(79)90031-7" target="_blank"&gt;10.1016/0301-9268(79)90031-7&lt;/a&gt;&lt;br /&gt;&lt;/span&gt;&lt;/span&gt;
&lt;ul&gt;&lt;li&gt;In the second part of the article, the authors discuss the importance of the pluton and how it affected the formation of the stratigraphic profile of the grand canyon.Â &lt;/li&gt;
&lt;/ul&gt;
Clark, M.D., 1979,Â Geology of the older Precambrian rocks of the Grand Canyon. Part III. Petrology of mafic schists and amphibolites: Precambrian Research, v. 8, p. 277-302, doi&lt;span&gt;&lt;span&gt;:Â &lt;a href="http://dx.doi.org/10.1016/0301-9268(79)90032-9" target="_blank"&gt;10.1016/0301-9268(79)90032-9&lt;/a&gt;&lt;br /&gt;&lt;/span&gt;&lt;/span&gt;
&lt;ul&gt;&lt;li&gt;The final section of this discussion set provides insight into the mafic layers of the stratigraphic column.Â &lt;/li&gt;
&lt;/ul&gt;
Ilg, B.R., Karlstrom, K.E., Hawkins, D.P., and Williams, M.L., 1996,Â Tectonic evolution of Paleoproterozoic rocks in the Grand Canyon: Insights into middle-crustal processes:Â Bulletin of the Geological Society of America, v. 108, p. 1149-1166, doi&lt;span&gt;&lt;span&gt;:Â &lt;a href="http://dx.doi.org/10.1130/0016-7606(1996)108" target="_blank"&gt;10.1130/0016-7606(1996)108&lt;/a&gt;&lt;br /&gt;&lt;/span&gt;&lt;/span&gt;
&lt;ul&gt;&lt;li&gt;This is a general look into the formation of the stratigraphic layers. This article does a good job combining the above articles into one condensed summary.Â &lt;/li&gt;
&lt;/ul&gt;</text>
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                  <text>&lt;strong&gt;Start Here&lt;/strong&gt;:&lt;br /&gt;Blakey, R.C., and Middleton, L.T., 2012, Geologic history and paleogeography of paleozoic and early mesozoic sedimentary rocks, eastern Grand Canyon, Arizona: Geologic Society of America Bulletin, v. 489, pp. 81-92, doi: &lt;a href="%20http%3A//dx.doi.org/10.1130/2012.2489(05)"&gt;10.1130/2012.2489(05)&lt;/a&gt;&lt;br /&gt;&lt;a href="http://dx.doi.org/10.1130/2012.2489(05)%20" target="_blank"&gt;&lt;br /&gt;&lt;/a&gt;
&lt;ul&gt;&lt;li&gt;This reference outlines the stratigraphy found in this suite. It specifically highlights the paleozoic era in which the samples represent.Â &lt;/li&gt;
&lt;/ul&gt;&lt;br /&gt;&lt;strong&gt;Additional Resources:Â &lt;br /&gt;&lt;/strong&gt;Brown, E.H., Babcock, R.S., Clark, M.D., and Livingston, D.E., 1979,Â Geology of the older Precambrian rocks of the Grand Canyon Part I. Petrology and structure of the Vishnu Complex: Precambrian Research, v. 8, p. 219-241, doi:Â &lt;a href="http://dx.doi.org/10.1016/0301-9268(79)90030-5%20"&gt;10.1016/0301-9268(79)90030-5Â &lt;/a&gt;&lt;br /&gt;&lt;ul&gt;&lt;li&gt;Brown et al. begins this series of 3 articles outlining the geologic timescale and discusses the Vishnu complex and how it fits into the geologic timescale. It provides an explaination for several of the samples in this collection.Â &lt;/li&gt;
&lt;/ul&gt;
Brown, E.H., Babcock, R.S., Clark, M.D., and Livingston, D.E., 1979,Â Geology of the older Precambrian rocks of the Grand Canyon Part II. The Zoroaster Plutonic Complex and related rocks: Precambrian Research, v. 8, p. 243-275, doi&lt;span&gt;&lt;span&gt;:Â &lt;a href="http://dx.doi.org/10.1016/0301-9268(79)90031-7" target="_blank"&gt;10.1016/0301-9268(79)90031-7&lt;/a&gt;&lt;br /&gt;&lt;/span&gt;&lt;/span&gt;
&lt;ul&gt;&lt;li&gt;In the second part of the article, the authors discuss the importance of the pluton and how it affected the formation of the stratigraphic profile of the grand canyon.Â &lt;/li&gt;
&lt;/ul&gt;
Clark, M.D., 1979,Â Geology of the older Precambrian rocks of the Grand Canyon. Part III. Petrology of mafic schists and amphibolites: Precambrian Research, v. 8, p. 277-302, doi&lt;span&gt;&lt;span&gt;:Â &lt;a href="http://dx.doi.org/10.1016/0301-9268(79)90032-9" target="_blank"&gt;10.1016/0301-9268(79)90032-9&lt;/a&gt;&lt;br /&gt;&lt;/span&gt;&lt;/span&gt;
&lt;ul&gt;&lt;li&gt;The final section of this discussion set provides insight into the mafic layers of the stratigraphic column.Â &lt;/li&gt;
&lt;/ul&gt;
Ilg, B.R., Karlstrom, K.E., Hawkins, D.P., and Williams, M.L., 1996,Â Tectonic evolution of Paleoproterozoic rocks in the Grand Canyon: Insights into middle-crustal processes:Â Bulletin of the Geological Society of America, v. 108, p. 1149-1166, doi&lt;span&gt;&lt;span&gt;:Â &lt;a href="http://dx.doi.org/10.1130/0016-7606(1996)108" target="_blank"&gt;10.1130/0016-7606(1996)108&lt;/a&gt;&lt;br /&gt;&lt;/span&gt;&lt;/span&gt;
&lt;ul&gt;&lt;li&gt;This is a general look into the formation of the stratigraphic layers. This article does a good job combining the above articles into one condensed summary.Â &lt;/li&gt;
&lt;/ul&gt;</text>
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                  <text>&lt;strong&gt;Start Here&lt;/strong&gt;:&lt;br /&gt;Blakey, R.C., and Middleton, L.T., 2012, Geologic history and paleogeography of paleozoic and early mesozoic sedimentary rocks, eastern Grand Canyon, Arizona: Geologic Society of America Bulletin, v. 489, pp. 81-92, doi: &lt;a href="%20http%3A//dx.doi.org/10.1130/2012.2489(05)"&gt;10.1130/2012.2489(05)&lt;/a&gt;&lt;br /&gt;&lt;a href="http://dx.doi.org/10.1130/2012.2489(05)%20" target="_blank"&gt;&lt;br /&gt;&lt;/a&gt;
&lt;ul&gt;&lt;li&gt;This reference outlines the stratigraphy found in this suite. It specifically highlights the paleozoic era in which the samples represent.Â &lt;/li&gt;
&lt;/ul&gt;&lt;br /&gt;&lt;strong&gt;Additional Resources:Â &lt;br /&gt;&lt;/strong&gt;Brown, E.H., Babcock, R.S., Clark, M.D., and Livingston, D.E., 1979,Â Geology of the older Precambrian rocks of the Grand Canyon Part I. Petrology and structure of the Vishnu Complex: Precambrian Research, v. 8, p. 219-241, doi:Â &lt;a href="http://dx.doi.org/10.1016/0301-9268(79)90030-5%20"&gt;10.1016/0301-9268(79)90030-5Â &lt;/a&gt;&lt;br /&gt;&lt;ul&gt;&lt;li&gt;Brown et al. begins this series of 3 articles outlining the geologic timescale and discusses the Vishnu complex and how it fits into the geologic timescale. It provides an explaination for several of the samples in this collection.Â &lt;/li&gt;
&lt;/ul&gt;
Brown, E.H., Babcock, R.S., Clark, M.D., and Livingston, D.E., 1979,Â Geology of the older Precambrian rocks of the Grand Canyon Part II. The Zoroaster Plutonic Complex and related rocks: Precambrian Research, v. 8, p. 243-275, doi&lt;span&gt;&lt;span&gt;:Â &lt;a href="http://dx.doi.org/10.1016/0301-9268(79)90031-7" target="_blank"&gt;10.1016/0301-9268(79)90031-7&lt;/a&gt;&lt;br /&gt;&lt;/span&gt;&lt;/span&gt;
&lt;ul&gt;&lt;li&gt;In the second part of the article, the authors discuss the importance of the pluton and how it affected the formation of the stratigraphic profile of the grand canyon.Â &lt;/li&gt;
&lt;/ul&gt;
Clark, M.D., 1979,Â Geology of the older Precambrian rocks of the Grand Canyon. Part III. Petrology of mafic schists and amphibolites: Precambrian Research, v. 8, p. 277-302, doi&lt;span&gt;&lt;span&gt;:Â &lt;a href="http://dx.doi.org/10.1016/0301-9268(79)90032-9" target="_blank"&gt;10.1016/0301-9268(79)90032-9&lt;/a&gt;&lt;br /&gt;&lt;/span&gt;&lt;/span&gt;
&lt;ul&gt;&lt;li&gt;The final section of this discussion set provides insight into the mafic layers of the stratigraphic column.Â &lt;/li&gt;
&lt;/ul&gt;
Ilg, B.R., Karlstrom, K.E., Hawkins, D.P., and Williams, M.L., 1996,Â Tectonic evolution of Paleoproterozoic rocks in the Grand Canyon: Insights into middle-crustal processes:Â Bulletin of the Geological Society of America, v. 108, p. 1149-1166, doi&lt;span&gt;&lt;span&gt;:Â &lt;a href="http://dx.doi.org/10.1130/0016-7606(1996)108" target="_blank"&gt;10.1130/0016-7606(1996)108&lt;/a&gt;&lt;br /&gt;&lt;/span&gt;&lt;/span&gt;
&lt;ul&gt;&lt;li&gt;This is a general look into the formation of the stratigraphic layers. This article does a good job combining the above articles into one condensed summary.Â &lt;/li&gt;
&lt;/ul&gt;</text>
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Peach Springs, Coconino Co., Arizona&#13;
Seligman, Ysvupai Co., Arizona &#13;
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                  <text>&lt;strong&gt;Start Here&lt;/strong&gt;:&lt;br /&gt;Blakey, R.C., and Middleton, L.T., 2012, Geologic history and paleogeography of paleozoic and early mesozoic sedimentary rocks, eastern Grand Canyon, Arizona: Geologic Society of America Bulletin, v. 489, pp. 81-92, doi: &lt;a href="%20http%3A//dx.doi.org/10.1130/2012.2489(05)"&gt;10.1130/2012.2489(05)&lt;/a&gt;&lt;br /&gt;&lt;a href="http://dx.doi.org/10.1130/2012.2489(05)%20" target="_blank"&gt;&lt;br /&gt;&lt;/a&gt;
&lt;ul&gt;&lt;li&gt;This reference outlines the stratigraphy found in this suite. It specifically highlights the paleozoic era in which the samples represent.Â &lt;/li&gt;
&lt;/ul&gt;&lt;br /&gt;&lt;strong&gt;Additional Resources:Â &lt;br /&gt;&lt;/strong&gt;Brown, E.H., Babcock, R.S., Clark, M.D., and Livingston, D.E., 1979,Â Geology of the older Precambrian rocks of the Grand Canyon Part I. Petrology and structure of the Vishnu Complex: Precambrian Research, v. 8, p. 219-241, doi:Â &lt;a href="http://dx.doi.org/10.1016/0301-9268(79)90030-5%20"&gt;10.1016/0301-9268(79)90030-5Â &lt;/a&gt;&lt;br /&gt;&lt;ul&gt;&lt;li&gt;Brown et al. begins this series of 3 articles outlining the geologic timescale and discusses the Vishnu complex and how it fits into the geologic timescale. It provides an explaination for several of the samples in this collection.Â &lt;/li&gt;
&lt;/ul&gt;
Brown, E.H., Babcock, R.S., Clark, M.D., and Livingston, D.E., 1979,Â Geology of the older Precambrian rocks of the Grand Canyon Part II. The Zoroaster Plutonic Complex and related rocks: Precambrian Research, v. 8, p. 243-275, doi&lt;span&gt;&lt;span&gt;:Â &lt;a href="http://dx.doi.org/10.1016/0301-9268(79)90031-7" target="_blank"&gt;10.1016/0301-9268(79)90031-7&lt;/a&gt;&lt;br /&gt;&lt;/span&gt;&lt;/span&gt;
&lt;ul&gt;&lt;li&gt;In the second part of the article, the authors discuss the importance of the pluton and how it affected the formation of the stratigraphic profile of the grand canyon.Â &lt;/li&gt;
&lt;/ul&gt;
Clark, M.D., 1979,Â Geology of the older Precambrian rocks of the Grand Canyon. Part III. Petrology of mafic schists and amphibolites: Precambrian Research, v. 8, p. 277-302, doi&lt;span&gt;&lt;span&gt;:Â &lt;a href="http://dx.doi.org/10.1016/0301-9268(79)90032-9" target="_blank"&gt;10.1016/0301-9268(79)90032-9&lt;/a&gt;&lt;br /&gt;&lt;/span&gt;&lt;/span&gt;
&lt;ul&gt;&lt;li&gt;The final section of this discussion set provides insight into the mafic layers of the stratigraphic column.Â &lt;/li&gt;
&lt;/ul&gt;
Ilg, B.R., Karlstrom, K.E., Hawkins, D.P., and Williams, M.L., 1996,Â Tectonic evolution of Paleoproterozoic rocks in the Grand Canyon: Insights into middle-crustal processes:Â Bulletin of the Geological Society of America, v. 108, p. 1149-1166, doi&lt;span&gt;&lt;span&gt;:Â &lt;a href="http://dx.doi.org/10.1130/0016-7606(1996)108" target="_blank"&gt;10.1130/0016-7606(1996)108&lt;/a&gt;&lt;br /&gt;&lt;/span&gt;&lt;/span&gt;
&lt;ul&gt;&lt;li&gt;This is a general look into the formation of the stratigraphic layers. This article does a good job combining the above articles into one condensed summary.Â &lt;/li&gt;
&lt;/ul&gt;</text>
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                  <text>&lt;strong&gt;Start Here&lt;/strong&gt;:&lt;br /&gt;Blakey, R.C., and Middleton, L.T., 2012, Geologic history and paleogeography of paleozoic and early mesozoic sedimentary rocks, eastern Grand Canyon, Arizona: Geologic Society of America Bulletin, v. 489, pp. 81-92, doi: &lt;a href="%20http%3A//dx.doi.org/10.1130/2012.2489(05)"&gt;10.1130/2012.2489(05)&lt;/a&gt;&lt;br /&gt;&lt;a href="http://dx.doi.org/10.1130/2012.2489(05)%20" target="_blank"&gt;&lt;br /&gt;&lt;/a&gt;
&lt;ul&gt;&lt;li&gt;This reference outlines the stratigraphy found in this suite. It specifically highlights the paleozoic era in which the samples represent.Â &lt;/li&gt;
&lt;/ul&gt;&lt;br /&gt;&lt;strong&gt;Additional Resources:Â &lt;br /&gt;&lt;/strong&gt;Brown, E.H., Babcock, R.S., Clark, M.D., and Livingston, D.E., 1979,Â Geology of the older Precambrian rocks of the Grand Canyon Part I. Petrology and structure of the Vishnu Complex: Precambrian Research, v. 8, p. 219-241, doi:Â &lt;a href="http://dx.doi.org/10.1016/0301-9268(79)90030-5%20"&gt;10.1016/0301-9268(79)90030-5Â &lt;/a&gt;&lt;br /&gt;&lt;ul&gt;&lt;li&gt;Brown et al. begins this series of 3 articles outlining the geologic timescale and discusses the Vishnu complex and how it fits into the geologic timescale. It provides an explaination for several of the samples in this collection.Â &lt;/li&gt;
&lt;/ul&gt;
Brown, E.H., Babcock, R.S., Clark, M.D., and Livingston, D.E., 1979,Â Geology of the older Precambrian rocks of the Grand Canyon Part II. The Zoroaster Plutonic Complex and related rocks: Precambrian Research, v. 8, p. 243-275, doi&lt;span&gt;&lt;span&gt;:Â &lt;a href="http://dx.doi.org/10.1016/0301-9268(79)90031-7" target="_blank"&gt;10.1016/0301-9268(79)90031-7&lt;/a&gt;&lt;br /&gt;&lt;/span&gt;&lt;/span&gt;
&lt;ul&gt;&lt;li&gt;In the second part of the article, the authors discuss the importance of the pluton and how it affected the formation of the stratigraphic profile of the grand canyon.Â &lt;/li&gt;
&lt;/ul&gt;
Clark, M.D., 1979,Â Geology of the older Precambrian rocks of the Grand Canyon. Part III. Petrology of mafic schists and amphibolites: Precambrian Research, v. 8, p. 277-302, doi&lt;span&gt;&lt;span&gt;:Â &lt;a href="http://dx.doi.org/10.1016/0301-9268(79)90032-9" target="_blank"&gt;10.1016/0301-9268(79)90032-9&lt;/a&gt;&lt;br /&gt;&lt;/span&gt;&lt;/span&gt;
&lt;ul&gt;&lt;li&gt;The final section of this discussion set provides insight into the mafic layers of the stratigraphic column.Â &lt;/li&gt;
&lt;/ul&gt;
Ilg, B.R., Karlstrom, K.E., Hawkins, D.P., and Williams, M.L., 1996,Â Tectonic evolution of Paleoproterozoic rocks in the Grand Canyon: Insights into middle-crustal processes:Â Bulletin of the Geological Society of America, v. 108, p. 1149-1166, doi&lt;span&gt;&lt;span&gt;:Â &lt;a href="http://dx.doi.org/10.1130/0016-7606(1996)108" target="_blank"&gt;10.1130/0016-7606(1996)108&lt;/a&gt;&lt;br /&gt;&lt;/span&gt;&lt;/span&gt;
&lt;ul&gt;&lt;li&gt;This is a general look into the formation of the stratigraphic layers. This article does a good job combining the above articles into one condensed summary.Â &lt;/li&gt;
&lt;/ul&gt;</text>
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&#13;
Modal Abundances:&#13;
Quartz (95%)&#13;
Matrix (5%)&#13;
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                  <text>This collection contains 21 samples. They are a representation of samples of lithology from the early precambrian to the late permian. The stratigraphic sequence contains a variety of rocks including, but not limited to schist, limestone, and sandstone. These specimens are representative of the geologic section in the Grand Canyon, but no specimens were collected within the boundaries of the National Park. </text>
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                  <text>&lt;strong&gt;Start Here&lt;/strong&gt;:&lt;br /&gt;Blakey, R.C., and Middleton, L.T., 2012, Geologic history and paleogeography of paleozoic and early mesozoic sedimentary rocks, eastern Grand Canyon, Arizona: Geologic Society of America Bulletin, v. 489, pp. 81-92, doi: &lt;a href="%20http%3A//dx.doi.org/10.1130/2012.2489(05)"&gt;10.1130/2012.2489(05)&lt;/a&gt;&lt;br /&gt;&lt;a href="http://dx.doi.org/10.1130/2012.2489(05)%20" target="_blank"&gt;&lt;br /&gt;&lt;/a&gt;
&lt;ul&gt;&lt;li&gt;This reference outlines the stratigraphy found in this suite. It specifically highlights the paleozoic era in which the samples represent.Â &lt;/li&gt;
&lt;/ul&gt;&lt;br /&gt;&lt;strong&gt;Additional Resources:Â &lt;br /&gt;&lt;/strong&gt;Brown, E.H., Babcock, R.S., Clark, M.D., and Livingston, D.E., 1979,Â Geology of the older Precambrian rocks of the Grand Canyon Part I. Petrology and structure of the Vishnu Complex: Precambrian Research, v. 8, p. 219-241, doi:Â &lt;a href="http://dx.doi.org/10.1016/0301-9268(79)90030-5%20"&gt;10.1016/0301-9268(79)90030-5Â &lt;/a&gt;&lt;br /&gt;&lt;ul&gt;&lt;li&gt;Brown et al. begins this series of 3 articles outlining the geologic timescale and discusses the Vishnu complex and how it fits into the geologic timescale. It provides an explaination for several of the samples in this collection.Â &lt;/li&gt;
&lt;/ul&gt;
Brown, E.H., Babcock, R.S., Clark, M.D., and Livingston, D.E., 1979,Â Geology of the older Precambrian rocks of the Grand Canyon Part II. The Zoroaster Plutonic Complex and related rocks: Precambrian Research, v. 8, p. 243-275, doi&lt;span&gt;&lt;span&gt;:Â &lt;a href="http://dx.doi.org/10.1016/0301-9268(79)90031-7" target="_blank"&gt;10.1016/0301-9268(79)90031-7&lt;/a&gt;&lt;br /&gt;&lt;/span&gt;&lt;/span&gt;
&lt;ul&gt;&lt;li&gt;In the second part of the article, the authors discuss the importance of the pluton and how it affected the formation of the stratigraphic profile of the grand canyon.Â &lt;/li&gt;
&lt;/ul&gt;
Clark, M.D., 1979,Â Geology of the older Precambrian rocks of the Grand Canyon. Part III. Petrology of mafic schists and amphibolites: Precambrian Research, v. 8, p. 277-302, doi&lt;span&gt;&lt;span&gt;:Â &lt;a href="http://dx.doi.org/10.1016/0301-9268(79)90032-9" target="_blank"&gt;10.1016/0301-9268(79)90032-9&lt;/a&gt;&lt;br /&gt;&lt;/span&gt;&lt;/span&gt;
&lt;ul&gt;&lt;li&gt;The final section of this discussion set provides insight into the mafic layers of the stratigraphic column.Â &lt;/li&gt;
&lt;/ul&gt;
Ilg, B.R., Karlstrom, K.E., Hawkins, D.P., and Williams, M.L., 1996,Â Tectonic evolution of Paleoproterozoic rocks in the Grand Canyon: Insights into middle-crustal processes:Â Bulletin of the Geological Society of America, v. 108, p. 1149-1166, doi&lt;span&gt;&lt;span&gt;:Â &lt;a href="http://dx.doi.org/10.1130/0016-7606(1996)108" target="_blank"&gt;10.1130/0016-7606(1996)108&lt;/a&gt;&lt;br /&gt;&lt;/span&gt;&lt;/span&gt;
&lt;ul&gt;&lt;li&gt;This is a general look into the formation of the stratigraphic layers. This article does a good job combining the above articles into one condensed summary.Â &lt;/li&gt;
&lt;/ul&gt;</text>
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Seligman, Ysvupai Co., Arizona &#13;
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&#13;
Both thin section images were taken at a 400x magnification.</text>
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                  <text>&lt;strong&gt;Start Here&lt;/strong&gt;:&lt;br /&gt;Blakey, R.C., and Middleton, L.T., 2012, Geologic history and paleogeography of paleozoic and early mesozoic sedimentary rocks, eastern Grand Canyon, Arizona: Geologic Society of America Bulletin, v. 489, pp. 81-92, doi: &lt;a href="%20http%3A//dx.doi.org/10.1130/2012.2489(05)"&gt;10.1130/2012.2489(05)&lt;/a&gt;&lt;br /&gt;&lt;a href="http://dx.doi.org/10.1130/2012.2489(05)%20" target="_blank"&gt;&lt;br /&gt;&lt;/a&gt;
&lt;ul&gt;&lt;li&gt;This reference outlines the stratigraphy found in this suite. It specifically highlights the paleozoic era in which the samples represent.Â &lt;/li&gt;
&lt;/ul&gt;&lt;br /&gt;&lt;strong&gt;Additional Resources:Â &lt;br /&gt;&lt;/strong&gt;Brown, E.H., Babcock, R.S., Clark, M.D., and Livingston, D.E., 1979,Â Geology of the older Precambrian rocks of the Grand Canyon Part I. Petrology and structure of the Vishnu Complex: Precambrian Research, v. 8, p. 219-241, doi:Â &lt;a href="http://dx.doi.org/10.1016/0301-9268(79)90030-5%20"&gt;10.1016/0301-9268(79)90030-5Â &lt;/a&gt;&lt;br /&gt;&lt;ul&gt;&lt;li&gt;Brown et al. begins this series of 3 articles outlining the geologic timescale and discusses the Vishnu complex and how it fits into the geologic timescale. It provides an explaination for several of the samples in this collection.Â &lt;/li&gt;
&lt;/ul&gt;
Brown, E.H., Babcock, R.S., Clark, M.D., and Livingston, D.E., 1979,Â Geology of the older Precambrian rocks of the Grand Canyon Part II. The Zoroaster Plutonic Complex and related rocks: Precambrian Research, v. 8, p. 243-275, doi&lt;span&gt;&lt;span&gt;:Â &lt;a href="http://dx.doi.org/10.1016/0301-9268(79)90031-7" target="_blank"&gt;10.1016/0301-9268(79)90031-7&lt;/a&gt;&lt;br /&gt;&lt;/span&gt;&lt;/span&gt;
&lt;ul&gt;&lt;li&gt;In the second part of the article, the authors discuss the importance of the pluton and how it affected the formation of the stratigraphic profile of the grand canyon.Â &lt;/li&gt;
&lt;/ul&gt;
Clark, M.D., 1979,Â Geology of the older Precambrian rocks of the Grand Canyon. Part III. Petrology of mafic schists and amphibolites: Precambrian Research, v. 8, p. 277-302, doi&lt;span&gt;&lt;span&gt;:Â &lt;a href="http://dx.doi.org/10.1016/0301-9268(79)90032-9" target="_blank"&gt;10.1016/0301-9268(79)90032-9&lt;/a&gt;&lt;br /&gt;&lt;/span&gt;&lt;/span&gt;
&lt;ul&gt;&lt;li&gt;The final section of this discussion set provides insight into the mafic layers of the stratigraphic column.Â &lt;/li&gt;
&lt;/ul&gt;
Ilg, B.R., Karlstrom, K.E., Hawkins, D.P., and Williams, M.L., 1996,Â Tectonic evolution of Paleoproterozoic rocks in the Grand Canyon: Insights into middle-crustal processes:Â Bulletin of the Geological Society of America, v. 108, p. 1149-1166, doi&lt;span&gt;&lt;span&gt;:Â &lt;a href="http://dx.doi.org/10.1130/0016-7606(1996)108" target="_blank"&gt;10.1130/0016-7606(1996)108&lt;/a&gt;&lt;br /&gt;&lt;/span&gt;&lt;/span&gt;
&lt;ul&gt;&lt;li&gt;This is a general look into the formation of the stratigraphic layers. This article does a good job combining the above articles into one condensed summary.Â &lt;/li&gt;
&lt;/ul&gt;</text>
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                  <text>&lt;strong&gt;Start Here&lt;/strong&gt;:&lt;br /&gt;Blakey, R.C., and Middleton, L.T., 2012, Geologic history and paleogeography of paleozoic and early mesozoic sedimentary rocks, eastern Grand Canyon, Arizona: Geologic Society of America Bulletin, v. 489, pp. 81-92, doi: &lt;a href="%20http%3A//dx.doi.org/10.1130/2012.2489(05)"&gt;10.1130/2012.2489(05)&lt;/a&gt;&lt;br /&gt;&lt;a href="http://dx.doi.org/10.1130/2012.2489(05)%20" target="_blank"&gt;&lt;br /&gt;&lt;/a&gt;
&lt;ul&gt;&lt;li&gt;This reference outlines the stratigraphy found in this suite. It specifically highlights the paleozoic era in which the samples represent.Â &lt;/li&gt;
&lt;/ul&gt;&lt;br /&gt;&lt;strong&gt;Additional Resources:Â &lt;br /&gt;&lt;/strong&gt;Brown, E.H., Babcock, R.S., Clark, M.D., and Livingston, D.E., 1979,Â Geology of the older Precambrian rocks of the Grand Canyon Part I. Petrology and structure of the Vishnu Complex: Precambrian Research, v. 8, p. 219-241, doi:Â &lt;a href="http://dx.doi.org/10.1016/0301-9268(79)90030-5%20"&gt;10.1016/0301-9268(79)90030-5Â &lt;/a&gt;&lt;br /&gt;&lt;ul&gt;&lt;li&gt;Brown et al. begins this series of 3 articles outlining the geologic timescale and discusses the Vishnu complex and how it fits into the geologic timescale. It provides an explaination for several of the samples in this collection.Â &lt;/li&gt;
&lt;/ul&gt;
Brown, E.H., Babcock, R.S., Clark, M.D., and Livingston, D.E., 1979,Â Geology of the older Precambrian rocks of the Grand Canyon Part II. The Zoroaster Plutonic Complex and related rocks: Precambrian Research, v. 8, p. 243-275, doi&lt;span&gt;&lt;span&gt;:Â &lt;a href="http://dx.doi.org/10.1016/0301-9268(79)90031-7" target="_blank"&gt;10.1016/0301-9268(79)90031-7&lt;/a&gt;&lt;br /&gt;&lt;/span&gt;&lt;/span&gt;
&lt;ul&gt;&lt;li&gt;In the second part of the article, the authors discuss the importance of the pluton and how it affected the formation of the stratigraphic profile of the grand canyon.Â &lt;/li&gt;
&lt;/ul&gt;
Clark, M.D., 1979,Â Geology of the older Precambrian rocks of the Grand Canyon. Part III. Petrology of mafic schists and amphibolites: Precambrian Research, v. 8, p. 277-302, doi&lt;span&gt;&lt;span&gt;:Â &lt;a href="http://dx.doi.org/10.1016/0301-9268(79)90032-9" target="_blank"&gt;10.1016/0301-9268(79)90032-9&lt;/a&gt;&lt;br /&gt;&lt;/span&gt;&lt;/span&gt;
&lt;ul&gt;&lt;li&gt;The final section of this discussion set provides insight into the mafic layers of the stratigraphic column.Â &lt;/li&gt;
&lt;/ul&gt;
Ilg, B.R., Karlstrom, K.E., Hawkins, D.P., and Williams, M.L., 1996,Â Tectonic evolution of Paleoproterozoic rocks in the Grand Canyon: Insights into middle-crustal processes:Â Bulletin of the Geological Society of America, v. 108, p. 1149-1166, doi&lt;span&gt;&lt;span&gt;:Â &lt;a href="http://dx.doi.org/10.1130/0016-7606(1996)108" target="_blank"&gt;10.1130/0016-7606(1996)108&lt;/a&gt;&lt;br /&gt;&lt;/span&gt;&lt;/span&gt;
&lt;ul&gt;&lt;li&gt;This is a general look into the formation of the stratigraphic layers. This article does a good job combining the above articles into one condensed summary.Â &lt;/li&gt;
&lt;/ul&gt;</text>
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                  <text>&lt;strong&gt;Start Here&lt;/strong&gt;:&lt;br /&gt;Blakey, R.C., and Middleton, L.T., 2012, Geologic history and paleogeography of paleozoic and early mesozoic sedimentary rocks, eastern Grand Canyon, Arizona: Geologic Society of America Bulletin, v. 489, pp. 81-92, doi: &lt;a href="%20http%3A//dx.doi.org/10.1130/2012.2489(05)"&gt;10.1130/2012.2489(05)&lt;/a&gt;&lt;br /&gt;&lt;a href="http://dx.doi.org/10.1130/2012.2489(05)%20" target="_blank"&gt;&lt;br /&gt;&lt;/a&gt;
&lt;ul&gt;&lt;li&gt;This reference outlines the stratigraphy found in this suite. It specifically highlights the paleozoic era in which the samples represent.Â &lt;/li&gt;
&lt;/ul&gt;&lt;br /&gt;&lt;strong&gt;Additional Resources:Â &lt;br /&gt;&lt;/strong&gt;Brown, E.H., Babcock, R.S., Clark, M.D., and Livingston, D.E., 1979,Â Geology of the older Precambrian rocks of the Grand Canyon Part I. Petrology and structure of the Vishnu Complex: Precambrian Research, v. 8, p. 219-241, doi:Â &lt;a href="http://dx.doi.org/10.1016/0301-9268(79)90030-5%20"&gt;10.1016/0301-9268(79)90030-5Â &lt;/a&gt;&lt;br /&gt;&lt;ul&gt;&lt;li&gt;Brown et al. begins this series of 3 articles outlining the geologic timescale and discusses the Vishnu complex and how it fits into the geologic timescale. It provides an explaination for several of the samples in this collection.Â &lt;/li&gt;
&lt;/ul&gt;
Brown, E.H., Babcock, R.S., Clark, M.D., and Livingston, D.E., 1979,Â Geology of the older Precambrian rocks of the Grand Canyon Part II. The Zoroaster Plutonic Complex and related rocks: Precambrian Research, v. 8, p. 243-275, doi&lt;span&gt;&lt;span&gt;:Â &lt;a href="http://dx.doi.org/10.1016/0301-9268(79)90031-7" target="_blank"&gt;10.1016/0301-9268(79)90031-7&lt;/a&gt;&lt;br /&gt;&lt;/span&gt;&lt;/span&gt;
&lt;ul&gt;&lt;li&gt;In the second part of the article, the authors discuss the importance of the pluton and how it affected the formation of the stratigraphic profile of the grand canyon.Â &lt;/li&gt;
&lt;/ul&gt;
Clark, M.D., 1979,Â Geology of the older Precambrian rocks of the Grand Canyon. Part III. Petrology of mafic schists and amphibolites: Precambrian Research, v. 8, p. 277-302, doi&lt;span&gt;&lt;span&gt;:Â &lt;a href="http://dx.doi.org/10.1016/0301-9268(79)90032-9" target="_blank"&gt;10.1016/0301-9268(79)90032-9&lt;/a&gt;&lt;br /&gt;&lt;/span&gt;&lt;/span&gt;
&lt;ul&gt;&lt;li&gt;The final section of this discussion set provides insight into the mafic layers of the stratigraphic column.Â &lt;/li&gt;
&lt;/ul&gt;
Ilg, B.R., Karlstrom, K.E., Hawkins, D.P., and Williams, M.L., 1996,Â Tectonic evolution of Paleoproterozoic rocks in the Grand Canyon: Insights into middle-crustal processes:Â Bulletin of the Geological Society of America, v. 108, p. 1149-1166, doi&lt;span&gt;&lt;span&gt;:Â &lt;a href="http://dx.doi.org/10.1130/0016-7606(1996)108" target="_blank"&gt;10.1130/0016-7606(1996)108&lt;/a&gt;&lt;br /&gt;&lt;/span&gt;&lt;/span&gt;
&lt;ul&gt;&lt;li&gt;This is a general look into the formation of the stratigraphic layers. This article does a good job combining the above articles into one condensed summary.Â &lt;/li&gt;
&lt;/ul&gt;</text>
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                  <text>&lt;strong&gt;Start Here&lt;/strong&gt;:&lt;br /&gt;Blakey, R.C., and Middleton, L.T., 2012, Geologic history and paleogeography of paleozoic and early mesozoic sedimentary rocks, eastern Grand Canyon, Arizona: Geologic Society of America Bulletin, v. 489, pp. 81-92, doi: &lt;a href="%20http%3A//dx.doi.org/10.1130/2012.2489(05)"&gt;10.1130/2012.2489(05)&lt;/a&gt;&lt;br /&gt;&lt;a href="http://dx.doi.org/10.1130/2012.2489(05)%20" target="_blank"&gt;&lt;br /&gt;&lt;/a&gt;
&lt;ul&gt;&lt;li&gt;This reference outlines the stratigraphy found in this suite. It specifically highlights the paleozoic era in which the samples represent.Â &lt;/li&gt;
&lt;/ul&gt;&lt;br /&gt;&lt;strong&gt;Additional Resources:Â &lt;br /&gt;&lt;/strong&gt;Brown, E.H., Babcock, R.S., Clark, M.D., and Livingston, D.E., 1979,Â Geology of the older Precambrian rocks of the Grand Canyon Part I. Petrology and structure of the Vishnu Complex: Precambrian Research, v. 8, p. 219-241, doi:Â &lt;a href="http://dx.doi.org/10.1016/0301-9268(79)90030-5%20"&gt;10.1016/0301-9268(79)90030-5Â &lt;/a&gt;&lt;br /&gt;&lt;ul&gt;&lt;li&gt;Brown et al. begins this series of 3 articles outlining the geologic timescale and discusses the Vishnu complex and how it fits into the geologic timescale. It provides an explaination for several of the samples in this collection.Â &lt;/li&gt;
&lt;/ul&gt;
Brown, E.H., Babcock, R.S., Clark, M.D., and Livingston, D.E., 1979,Â Geology of the older Precambrian rocks of the Grand Canyon Part II. The Zoroaster Plutonic Complex and related rocks: Precambrian Research, v. 8, p. 243-275, doi&lt;span&gt;&lt;span&gt;:Â &lt;a href="http://dx.doi.org/10.1016/0301-9268(79)90031-7" target="_blank"&gt;10.1016/0301-9268(79)90031-7&lt;/a&gt;&lt;br /&gt;&lt;/span&gt;&lt;/span&gt;
&lt;ul&gt;&lt;li&gt;In the second part of the article, the authors discuss the importance of the pluton and how it affected the formation of the stratigraphic profile of the grand canyon.Â &lt;/li&gt;
&lt;/ul&gt;
Clark, M.D., 1979,Â Geology of the older Precambrian rocks of the Grand Canyon. Part III. Petrology of mafic schists and amphibolites: Precambrian Research, v. 8, p. 277-302, doi&lt;span&gt;&lt;span&gt;:Â &lt;a href="http://dx.doi.org/10.1016/0301-9268(79)90032-9" target="_blank"&gt;10.1016/0301-9268(79)90032-9&lt;/a&gt;&lt;br /&gt;&lt;/span&gt;&lt;/span&gt;
&lt;ul&gt;&lt;li&gt;The final section of this discussion set provides insight into the mafic layers of the stratigraphic column.Â &lt;/li&gt;
&lt;/ul&gt;
Ilg, B.R., Karlstrom, K.E., Hawkins, D.P., and Williams, M.L., 1996,Â Tectonic evolution of Paleoproterozoic rocks in the Grand Canyon: Insights into middle-crustal processes:Â Bulletin of the Geological Society of America, v. 108, p. 1149-1166, doi&lt;span&gt;&lt;span&gt;:Â &lt;a href="http://dx.doi.org/10.1130/0016-7606(1996)108" target="_blank"&gt;10.1130/0016-7606(1996)108&lt;/a&gt;&lt;br /&gt;&lt;/span&gt;&lt;/span&gt;
&lt;ul&gt;&lt;li&gt;This is a general look into the formation of the stratigraphic layers. This article does a good job combining the above articles into one condensed summary.Â &lt;/li&gt;
&lt;/ul&gt;</text>
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          <name>Dublin Core</name>
          <description>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/.</description>
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            <element elementId="50">
              <name>Title</name>
              <description>A name given to the resource</description>
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                  <text>(GC) Grand Canyon Stratigraphic Suite -- Grand Canyon, Arizona</text>
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              <name>Description</name>
              <description>An account of the resource</description>
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                  <text>This collection contains 21 samples. They are a representation of samples of lithology from the early precambrian to the late permian. The stratigraphic sequence contains a variety of rocks including, but not limited to schist, limestone, and sandstone. These specimens are representative of the geologic section in the Grand Canyon, but no specimens were collected within the boundaries of the National Park. </text>
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            <element elementId="37">
              <name>Contributor</name>
              <description>An entity responsible for making contributions to the resource</description>
              <elementTextContainer>
                <elementText elementTextId="17761">
                  <text>Western Minerals Inc.</text>
                </elementText>
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            <element elementId="109">
              <name>References</name>
              <description>A related resource that is referenced, cited, or otherwise pointed to by the described resource.</description>
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                <elementText elementTextId="17805">
                  <text>&lt;strong&gt;Start Here&lt;/strong&gt;:&lt;br /&gt;Blakey, R.C., and Middleton, L.T., 2012, Geologic history and paleogeography of paleozoic and early mesozoic sedimentary rocks, eastern Grand Canyon, Arizona: Geologic Society of America Bulletin, v. 489, pp. 81-92, doi: &lt;a href="%20http%3A//dx.doi.org/10.1130/2012.2489(05)"&gt;10.1130/2012.2489(05)&lt;/a&gt;&lt;br /&gt;&lt;a href="http://dx.doi.org/10.1130/2012.2489(05)%20" target="_blank"&gt;&lt;br /&gt;&lt;/a&gt;
&lt;ul&gt;&lt;li&gt;This reference outlines the stratigraphy found in this suite. It specifically highlights the paleozoic era in which the samples represent.Â &lt;/li&gt;
&lt;/ul&gt;&lt;br /&gt;&lt;strong&gt;Additional Resources:Â &lt;br /&gt;&lt;/strong&gt;Brown, E.H., Babcock, R.S., Clark, M.D., and Livingston, D.E., 1979,Â Geology of the older Precambrian rocks of the Grand Canyon Part I. Petrology and structure of the Vishnu Complex: Precambrian Research, v. 8, p. 219-241, doi:Â &lt;a href="http://dx.doi.org/10.1016/0301-9268(79)90030-5%20"&gt;10.1016/0301-9268(79)90030-5Â &lt;/a&gt;&lt;br /&gt;&lt;ul&gt;&lt;li&gt;Brown et al. begins this series of 3 articles outlining the geologic timescale and discusses the Vishnu complex and how it fits into the geologic timescale. It provides an explaination for several of the samples in this collection.Â &lt;/li&gt;
&lt;/ul&gt;
Brown, E.H., Babcock, R.S., Clark, M.D., and Livingston, D.E., 1979,Â Geology of the older Precambrian rocks of the Grand Canyon Part II. The Zoroaster Plutonic Complex and related rocks: Precambrian Research, v. 8, p. 243-275, doi&lt;span&gt;&lt;span&gt;:Â &lt;a href="http://dx.doi.org/10.1016/0301-9268(79)90031-7" target="_blank"&gt;10.1016/0301-9268(79)90031-7&lt;/a&gt;&lt;br /&gt;&lt;/span&gt;&lt;/span&gt;
&lt;ul&gt;&lt;li&gt;In the second part of the article, the authors discuss the importance of the pluton and how it affected the formation of the stratigraphic profile of the grand canyon.Â &lt;/li&gt;
&lt;/ul&gt;
Clark, M.D., 1979,Â Geology of the older Precambrian rocks of the Grand Canyon. Part III. Petrology of mafic schists and amphibolites: Precambrian Research, v. 8, p. 277-302, doi&lt;span&gt;&lt;span&gt;:Â &lt;a href="http://dx.doi.org/10.1016/0301-9268(79)90032-9" target="_blank"&gt;10.1016/0301-9268(79)90032-9&lt;/a&gt;&lt;br /&gt;&lt;/span&gt;&lt;/span&gt;
&lt;ul&gt;&lt;li&gt;The final section of this discussion set provides insight into the mafic layers of the stratigraphic column.Â &lt;/li&gt;
&lt;/ul&gt;
Ilg, B.R., Karlstrom, K.E., Hawkins, D.P., and Williams, M.L., 1996,Â Tectonic evolution of Paleoproterozoic rocks in the Grand Canyon: Insights into middle-crustal processes:Â Bulletin of the Geological Society of America, v. 108, p. 1149-1166, doi&lt;span&gt;&lt;span&gt;:Â &lt;a href="http://dx.doi.org/10.1130/0016-7606(1996)108" target="_blank"&gt;10.1130/0016-7606(1996)108&lt;/a&gt;&lt;br /&gt;&lt;/span&gt;&lt;/span&gt;
&lt;ul&gt;&lt;li&gt;This is a general look into the formation of the stratigraphic layers. This article does a good job combining the above articles into one condensed summary.Â &lt;/li&gt;
&lt;/ul&gt;</text>
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              <name>Spatial Coverage</name>
              <description>Spatial characteristics of the resource.</description>
              <elementTextContainer>
                <elementText elementTextId="17993">
                  <text>Peach Springs, Mohave Co., Arizona&#13;
Peach Springs, Coconino Co., Arizona&#13;
Seligman, Ysvupai Co., Arizona &#13;
Williams, Coconino Co., Arizona</text>
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            <element elementId="117">
              <name>Accrual Method</name>
              <description>The method by which items are added to a collection.</description>
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                <elementText elementTextId="17994">
                  <text>Purchased from Western Minerals Inc. </text>
                </elementText>
              </elementTextContainer>
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            <element elementId="116">
              <name>Temporal Coverage</name>
              <description>Temporal characteristics of the resource.</description>
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                <elementText elementTextId="18021">
                  <text>Samples range from Precambrian - Permian</text>
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      <name>Rock</name>
      <description>A physical material with a mineral composition.</description>
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        <element elementId="128">
          <name>Unit</name>
          <description>Formation or other descriptive rock category</description>
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              <text>Toroweap Formation</text>
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          <name>Number of Thin Sections</name>
          <description>Number of thin sections associated with this sample</description>
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            <elementText elementTextId="2912">
              <text>1</text>
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          <element elementId="50">
            <name>Title</name>
            <description>A name given to the resource</description>
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                <text>Toroweap Limestone</text>
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            <name>Description</name>
            <description>An account of the resource</description>
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                <text>A sample from the gamma member of the Toroweap Formation.  It is an orangish-brown sample.&#13;
Both thin section images were taken at a 400x magnification.</text>
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            <name>Date</name>
            <description>A point or period of time associated with an event in the lifecycle of the resource</description>
            <elementTextContainer>
              <elementText elementTextId="2904">
                <text>no date</text>
              </elementText>
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            <name>Contributor</name>
            <description>An entity responsible for making contributions to the resource</description>
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                <text>Western Minerals Inc.</text>
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            <name>Is Part Of</name>
            <description>A related resource in which the described resource is physically or logically included.</description>
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              <elementText elementTextId="2906">
                <text>&lt;a href="http://www.geosciencecollections.milne-library.org/items/show/1"&gt;Grand Canyon Western Minerals Supplementary Information&lt;/a&gt;</text>
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          <element elementId="43">
            <name>Identifier</name>
            <description>An unambiguous reference to the resource within a given context</description>
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              <elementText elementTextId="2907">
                <text>GC-18 </text>
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          <element elementId="115">
            <name>Spatial Coverage</name>
            <description>Spatial characteristics of the resource.</description>
            <elementTextContainer>
              <elementText elementTextId="2908">
                <text>Prominent bluff near US 66 at S. end of Aubrey Cliffs, see specimen 14 locality.</text>
              </elementText>
            </elementTextContainer>
          </element>
          <element elementId="116">
            <name>Temporal Coverage</name>
            <description>Temporal characteristics of the resource.</description>
            <elementTextContainer>
              <elementText elementTextId="2909">
                <text>Permian</text>
              </elementText>
            </elementTextContainer>
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          <element elementId="117">
            <name>Accrual Method</name>
            <description>The method by which items are added to a collection.</description>
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              <elementText elementTextId="2910">
                <text>Purchased from Western Minerals Inc.</text>
              </elementText>
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          <element elementId="86">
            <name>Alternative Title</name>
            <description>An alternative name for the resource. The distinction between titles and alternative titles is application-specific.</description>
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              <elementText elementTextId="20086">
                <text>Shaley Limestone</text>
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