Conodonts of the Estill Shale and Bisher Formation (Silurian, Southern Ohio): Biostratigraphy and Distribution
Creators:Kleffner, Mark A.
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Citation:The Ohio Journal of Science. v87, n3 (June, 1987), 78-89
Representatives of 20 species of conodonts have been isolated from samples of the Silurian Estill Shale and Bisher Formation at four localities in southern Ohio. The Estill belongs in the amorphognathoides Zone and is late Llandoverian to early Wenlockian. The Estill-Bisher contact is an unconformity. In Adams and southern Highland counties, the Bisher belongs in the middle and upper ranuliformis Zone and is late early to possibly early middle Wenlockian; in northern Highland County the Bisher belongs in the lower ranuliformis Zone and is middle early to late early Wenlockian. The Estill was deposited in a gradually shoaling sea that regressed from Adams and Highland counties in the early Wenlockian. The sea transgressed southward across the two counties later in the early Wenlockian and deposited the Bisher in a shallow, subtidal environment.
Author Institution: Department of Geology and Mineralogy, The Ohio State University
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