Middle Ordovician Conodont Biostratigraphy of the Coburn Formation in Central Pennsylvania and its Correlation with the New York Standard Succession
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Date
1999-08
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Publisher
The Ohio State University
Abstract
Middle Ordovician conodonts have been little studied previously in central
Pennsylvania. The present study of samples from a well-exposed section through
the Coburn Formation near Reedsville produced a moderately abundant and not
very diverse conodont fauna dominated by Phragmodus undatus, Panderodus sp.,
Drepanoistodus suberectus, and Plectodina aculeata. Important for the
correlation of the uppermost Coburn is the occurrence of Polyplacognathus
ramosus, which suggests an age no younger than the A. tvaerensis Zone. Based on
conodont, graptolite, and K-bentonite evidence, the Coburn is correlated with a
portion of the Flat Creek Member of the Utica Shale, and with the Shermanian
part of the Trenton Group, of New York.