The Sonyea Group is a geologic group in the northern part of the Appalachian Basin . It preserves fossils dating back to the Devonian period .
2-606: In the western part, it is divided into the Cashaqua Shale at the top, and the Middlesex Shale at the bottom. In the east, various shale formations are included between the Cashaqua and Middlesex members, including Rye Point Shale, Rock Stream Formation (" Enfield Formation ") Siltstone, Pulteney shale , Sawmill Creek Shale, Johns Creek Shale and Montour Shale. Loyalsburg Formation This article about
4-774: A specific stratigraphic formation in Pennsylvania is a stub . You can help Misplaced Pages by expanding it . Cashaqua Shale The Cashaqua Shale is a geologic formation in New York . It preserves fossils dating back to the Devonian period . The Cashaqua shale underlies the Rhinestreet Shale member of the West Falls Group , and overlies various other members of the Sonyea Group . In
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