West Falls Group (geologic group)

West Falls Formation
West Falls Formation
Stratigraphic range: Frasnian
	Fractured concretions in Rhinestreet Shale Member of West Falls Formation
Type	Geologic formation
Sub-units	Angola Shale (NY); Nunda Sandstone (NY,PA); West Hill Formation (NY); Gardeau Formation (NY,PA); Grimes Siltstone (NY); Rhinestreet Formation (NY,PA); Walton Formation (NY); Moreland Shale (NY); Millport Shale (NY); Beers Hill Formation (NY); Slide Mountain Formation (NY); Honesdale Formation (NY);
Underlies	Java Formation
Overlies	Sonyea Group
Lithology
Primary	Shale
Other	Black shale
Location
Region	Appalachian Basin
Country	United States
Extent	Kentucky; New York; Ohio; Pennsylvania; Tennessee; Virginia; West Virginia;
Type section
Named for	West Falls, New York

The West Falls Group is a geologic group in the Appalachian Basin. It dates back to the Devonian period. Also stratigraphically equivalent to the Portage Group.

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