Cashaqua Shale

The Cashaqua Shale is a geologic formation in New York. It preserves fossils dating back to the Devonian period.

Cashaqua Shale
Stratigraphic range: Devonian
Type	Formation
Unit of	Sonyea Group
Underlies	West Falls Group
Overlies	(see description)
Location
Region	New York,  Pennsylvania
Country	United States
The Cashaqua Shale and its various underlying members in western and west-central New York.[1]

The Cashaqua shale underlies the Rhinestreet Shale member of the West Falls Group, and overlies various other members of the Sonyea Group. In the western part of New York State, it overlies the Middlesex Shale, and moving eastward, it overlies the Pulteney shale and then the Rock Stream Formation in west-central New York.^[1]

References

1. Colton, George W.; de Witt, Wallace Jr. (1958). "Stratigraphy of the Sonyea Formation of Late Devonian Age in Western and West-Central New York". United States Geological Survey. United States Department of the Interior. Retrieved 22 September 2015.

• "Cashaqua and Middlesex Shales". USGS. Retrieved 2015-09-17.
• Bergin, M. J. (1964). "Bedrock Geology of the Penn Yan and Keuka Park Quadrangles New York". Geological Survey Bulletin (1161-G). USGS. Retrieved 22 September 2015.
• "Cashaqua Shale Formation - Sonyea Group". Shanan E. Peters & Noel A. Heim. Archived from the original on 2015-09-23. Retrieved 2015-09-17.
• Rickard, L.V.; Isachsen, Y.W.; Fisher, D.W. (1970). "Geologic map of New York: Finger Lakes sheet". New York State Museum. Retrieved 2015-09-17.
• Schieber, J. (1999). "Distribution and deposition of mudstone facies in the Upper Devonian Sonyea Group of New York". Journal of Sedimentary Research. 69. SEPM Society for Sedimentary Geology: 909–925. doi:10.2110/jsr.69.909. Retrieved 22 September 2015.