https://ilstratwiki.web.illinois.edu/index.php?title=Dement_Member&feed=atom&action=historyDement Member - Revision history2024-03-29T08:29:30ZRevision history for this page on the wikiMediaWiki 1.38.4https://ilstratwiki.web.illinois.edu/index.php?title=Dement_Member&diff=15468&oldid=prevJennifer.Obrad: /* Name */2017-01-12T18:04:13Z<p><span dir="auto"><span class="autocomment">Name</span></span></p>
<p><b>New page</b></p><div>{{Editwithform}}<br />
{{Tree<br />
|category1=Paleozoic Erathem<br />
|category2=Ordovician System<br />
|category3=Blackriveran Stage<br />
|category4=Tippecanoe Sequence<br />
|category5=Ottawa Limestone Megagroup<br />
|category6=Platteville Group<br />
|category7=Plattin Subgroup<br />
|category8=Champlainian Series<br />
|category9=Grand Detour Formation<br />
|tree1=Ottawa Limestone Megagroup<br />
|tree2=Platteville Group<br />
|tree3=Plattin Subgroup<br />
|tree4=Grand Detour Formation<br />
|tree5=Dement Member<br />
|tree21=Paleozoic Erathem<br />
|tree22=Ordovician System<br />
|tree23=Champlainian Series<br />
|tree24=Blackriveran Stage<br />
|tree31=Tippecanoe Sequence<br />
}}<br />
==Primary source==<br />
Willman, H. B., Elwood Atherton, T. C. Buschbach, Charles Collinson, John C. Frye, M. E. Hopkins, Jerry A. Lineback, and Jack A. Simon, 1975, Handbook of Illinois Stratigraphy: Illinois State Geological Survey Bulletin 95, 261 p.<br />
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==Contributing author&#40;s&#41;==<br />
H. B. Willman and T. C. Buschbach<br />
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==Name==<br />
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===Original description===<br />
The Dement Member of the Grand Detour Formation (Templeton and Willman, 1963, p. 84).<br />
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===Derivation===<br />
Named for Dement Avenue in Dixon, Lee County, 2 miles south of the type section.<br />
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===Other names===<br />
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===History&#47;background===<br />
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==Type section==<br />
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===Type location===<br />
The type section of the Dement Member is part of the type section for the Grand Detour which is located in a quarry in the west bluff of the Rock River, on the Walgreen estate 2 miles north of Dixon (NE 20, 22N-9E), where it is 8 feet thick.<br />
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===Type author&#40;s&#41;===<br />
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===Type status===<br />
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==Reference section==<br />
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===Reference location===<br />
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===Reference author&#40;s&#41;===<br />
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===Reference status===<br />
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==Stratigraphic relationships==<br />
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==Extent and thickness==<br />
The Dement Member is generally 3-8 feet thick in the northern outcrop area and in the Calhoun County exposures, but it thickens southward to 20 feet in the Cape Girardeau area.<br />
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==Lithology==<br />
In northern Illinois the Dement Member is relatively pure, dolomite-mottled, gray, lithographic, thick-bedded limestone, but locally it is fine-grained dolomite. It contains a few thin calcarenitic layers and a few scattered chert nodules. In the southern area it is brown, fucoidal, and only locally cherty, but near St. Louis it is a conglomeratic, vuggy, very fine-grained calcarenite.<br />
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==Core&#40;s&#41;==<br />
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==Photograph&#40;s&#41;==<br />
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==Contacts==<br />
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==Well log characteristics==<br />
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==Fossils==<br />
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==Age and correlation==<br />
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==Environments of deposition==<br />
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==Economic importance==<br />
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==Remarks==<br />
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==References==<br />
TEMPLETON, J. S., and H. B. WILLMAN, 1963, Champlainian Series (Middle Ordovician) in Illinois: Illinois State Geological Survey Bulletin 89, 260 p.<br />
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{{Codes<br />
|membercode=8020<br />
|geo_unit=--<br />
}}</div>Jennifer.Obrad