The Rock Stream Formation (or Rock Stream siltstone[1]) is a geologic formation in New York. It preserves fossils dating back to the Devonian period.

Rock Stream Formation
Stratigraphic range: Frasnian
TypeFormation
Unit ofSonyea Group
UnderliesCashaqua Shale
OverliesPulteney shale
Lithology
PrimarySiltstone
OtherShale
Location
Region New York
Country United States

See also

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References

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  1. ^ "Sonyea Group". USGS. Retrieved 17 September 2015.