Sinnipee Group
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The Sinnipee Group is geological group in Southern and Eastern Wisconsin. It consists primarily of sedimentary carbonate rocks. Primarily made of dolomite, it also has limestone as a secondary compone
The Illaenid trilobite Thaleops found in the Sinnipee Group in Dane County
The strophomenid brachiopod Strophomena from the Sinnipee Group in Dane County
The imprint of the nautiloid Trocholites from the Sinnipee Group in Dane County
An unidentified orthid brachiopod from the Sinnipee Group in Dane County
Decorah Shale
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The Decorah Shale is a fossiliferous shale that makes up the lowermost formation in the Galena Group. The Decorah lies above the Platteville Limestone and below the Cummingsville Formation in the sedi
Decorah Shale exposed in Decorah, Iowa. The Decorah is gray; above it is the brown Cummingsville Formation.