Sonyea Formation

The Sonyea Group is a geologic group in the northern part of the Appalachian Basin. It preserves fossils dating back to the Devonian period.

Sonyea Group Stratigraphic range: Frasnian
Type	Group
Unit of	Frasnian
Sub-units	See text
Underlies	West Falls Group
Overlies	Genesee Group and Harrell Shale
Lithology
Primary	Shale
Other	Siltstone
Location
Region	Appalachian Basin of eastern North America[1]
Country	United States
Stratigraphic cross-section of the Sonyea Formation in New York State[2]

In the western part,[1][3] 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.

See also

• List of fossiliferous stratigraphic units in Pennsylvania
• Paleontology in Pennsylvania

References

1. "Sonyea Group". USGS. Retrieved 2015-09-17.
2. 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.
3. 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.

• Various Contributors to the Paleobiology Database. "Fossilworks: Gateway to the Paleobiology Database". Archived from the original on 31 July 2014. Retrieved 22 June 2014.
• Schieber, J. (1999). "Distribution and deposition of mudstone facies in the Upper Devonian Sonyea Group of New York". Journal of Sedimentary Research. SEPM Society for Sedimentary Geology. 69: 909–925. doi:10.2110/jsr.69.909. Retrieved 22 September 2015.