https://ilstratwiki.web.illinois.edu/index.php?title=Historical:Cooper_Limestone_Member&feed=atom&action=historyHistorical:Cooper Limestone Member - Revision history2024-03-29T11:11:23ZRevision history for this page on the wikiMediaWiki 1.38.4https://ilstratwiki.web.illinois.edu/index.php?title=Historical:Cooper_Limestone_Member&diff=14992&oldid=prevJennifer.Obrad at 17:37, 9 January 20172017-01-09T17:37:32Z<p></p>
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{{Tree<br />
|tree1=Hunton Limestone Megagroup <br />
|tree2=Grand Tower Limestone <br />
|tree3=Cooper Limestone Member<br />
|tree21=Paleozoic Erathem <br />
|tree22=Devonian System <br />
|tree23=Middle Devonian Series <br />
|tree31=Kaskaskia Sequence <br />
|category1=Paleozoic Erathem<br />
|category2=Devonian System<br />
|category3=Kaskaskia Sequence<br />
|category4=Hunton Limestone Megagroup<br />
|category5=Middle Devonian Series<br />
|category6=Grand Tower Limestone<br />
|category7=Limestone<br />
}}<br />
==Authors==<br />
Charles Collinson and Elwood Atherton<br />
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==Name Origin==<br />
The Cooper Limestone Member of the Grand Tower Limestone (Swallow, 1855, p. 108, 196) is named for Cooper County, Missouri, where it is classified as a facies of the Calloway Limestone (Koenig, 1961).<br />
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==Correlation==<br />
The Cooper Limestone Member is similar to the Wapsipinicon Limestone north of the Sangamon Arch and probably is continuous with it west of Illinois.<br />
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==Extent and Thickness==<br />
In Illinois the Cooper Limestone Member is as much as 50 feet thick in a belt 60-90 miles wide that extends eastward across the state south of the Sangamon Arch (fig. D-14). It is exposed only in Calhoun County (Meents and Swann, 1965), where it previously was considered part of the Cedar Valley Limestone.<br />
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Figure_D-14.jpg|{{file:Figure_D-14.jpg}}<br />
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==Stratigraphic Position==<br />
On its northern margin the Cooper is overlapped by the Lingle Limestone, and on the south it grades laterally to the light-colored dolomite that overlies the Geneva Dolomite Member.<br />
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==Description==<br />
The Cooper Limestone Member is sparsely fossiliferous, gray, dense, lithographic, pure limestone, but it contains scattered grains of quartz sand in some localities. <br />
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==References==<br />
KOENIG, J. W., 1961, Devonian System, in Stratigraphic succession in Missouri: Missouri Geological Survey, v. 40, p. 36-49.<br><br />
MEENTS, W. F., and D. H. SWANN, 1965, Grand Tower Limestone (Devonian) of southern Illinois: Illinois State Geological Survey Circular 389, 34 p.<br><br />
SWALLOW, G. C., 1855, Geology of Missouri: Missouri Geological Survey 2nd Annual Report, p. 59-170.<br />
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{{Codes <br />
| membercode = 6110<br />
| geo_unit = --<br />
| geo_image =<br />
}}</div>Jennifer.Obrad