https://ilstratwiki.web.illinois.edu/index.php?title=Historical:Gunn_Member&feed=atom&action=historyHistorical:Gunn Member - Revision history2024-03-28T16:52:24ZRevision history for this page on the wikiMediaWiki 1.38.4https://ilstratwiki.web.illinois.edu/index.php?title=Historical:Gunn_Member&diff=13019&oldid=prevJennifer.Obrad at 16:32, 29 November 20162016-11-29T16:32:19Z<p></p>
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{{Tree<br />
|tree1=Potsdam Sandstone Megagroup <br />
|tree2=Mt. Simon Sandstone <br />
|tree3=Gunn Member <br />
|tree21=Paleozoic Erathem <br />
|tree22=Cambrian System <br />
|tree23=Croixan Series <br />
|tree24=Dresbachian Stage <br />
|tree31=Sauk Sequence <br />
|category1=Paleozoic Erathem<br />
|category2=Cambrian System<br />
|category3=Dresbachian Stage<br />
|category4=Sauk Sequence<br />
|category5=Potsdam Sandstone Megagroup<br />
|category6=Croixan Series<br />
|category7=Mt. Simon Sandstone<br />
}}<br />
==Author==<br />
T. C. Buschbach<br />
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==Name Origin==<br />
The Gunn Member of the Mt. Simon Sandstone (Templeton, 1950, p. 155), which overlies the Lacey Member, is named for Gunn School, De Kalb County.<br />
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==Type Section==<br />
The type section of the Gunn Member of the Mt. Simon Sandstone is located 2.75 miles southeast of Gunn School, De Kalb County. The member is 1648-1880 feet deep (sample set 1466) in the same boring as the Lacey Member.<br />
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==Extent and Thickness==<br />
The Gunn Member is 130-150 feet thick in the Chicago area, but elsewhere it is 71-260 feet thick.<br />
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==Description==<br />
It is a relatively fine-grained member, but the sand ranges from fine to medium grained. A few thin conglomeratic beds are present in some areas.<br />
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==References==<br />
TEMPLETON, J. S., 1950, Mt. Simon Sandstone in northern Illinois: Illinois Academy of Science Transactions, v. 43, p. 151-159.<br />
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{{Codes <br />
| membercode = 8830<br />
| geo_unit = --<br />
| geo_image =<br />
}}</div>Jennifer.Obrad