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Conodonts of the estill shale and bisher formation silurian southern ohio usa biostratigraphy and distribution



Conodonts of the estill shale and bisher formation silurian southern ohio usa biostratigraphy and distribution



Ohio Journal of Science 87(3): 78-89



Representatives of 20 species [Carniodus carnulus, Distomodus staurognathoides, Johnognathus huddlel, Oulodus petila, Ozarkodina hardra, Ozarkodina polinclinata, Pterospathodus amorphognathoides, Pterospathodus pennatus procerus, Pterospathodus pennatus ssp. Indet., Panderodus sp. cf. P. recurvatus, Pseudooneotodus tricornis, Kochelella ranuliformis, Ozarkodina excavata, Decoriconus fragilis, Panderodus unicostatus, Pseudooneotodus bicornis, Wallserodus sancticlairl, Oulodus sp., Ozarkodina confluens and Ozarkodina sagitta rhenana] 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 possible 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 countries later in the early Wenlockian and deposited the Bisher in a shallow, subtidal environment.

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