Rock Stream Formation

Rock Stream Formation Stratigraphic range: Frasnian
Type	Formation
Unit of	Sonyea Group
Underlies	Cashaqua Shale
Overlies	Pulteney shale
Lithology
Primary	Siltstone
Other	Shale
Location
Region	New York
Country	United States

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