West Falls Group

West Falls Group
Stratigraphic range: Frasnian
Fractured concretions in Rhinestreet Shale Formation of West Falls Group
TypeGeologic Group
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)
UnderliesJava Formation
OverliesSonyea Group
Lithology
PrimaryShale
OtherBlack shale
Location
RegionAppalachian Basin
CountryUnited States
ExtentKentucky, New York, Ohio, Pennsylvania, Tennessee, Virginia, West Virginia
Type section
Named forWest Falls, New York
Named byJ. Pepper, W. De Witt, and G.W. Colton in 1956

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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