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Wiscoy Falls - The Frasnian / Famennian Boundary

Wiscoy Falls - Dunkirk-Wiscoy contact as-well-as the Frasnian/Famennian boundary

Wiscoy Falls - The Frasnian / Famennian boundary
Located in Allegany County
Image courtesy of Gerald Smith

Type: Creek side.

Features: Numerous sedimentary structures including: grooves, striations, load casts,
climbing ripples, calcareous concretions and Cruziana and Skolithos ichnofacies.

Feature Type: Type Section.

Reference: NYS Geological Association Field Trip Guidebook, 71st Annual Meeting 1999;
Structure and Upper Devonian Stratigraphy in the Appalachian Plateau of Allegany County,
New York State, Including the Clarendon-Linden Fault System.
For online reference please visit -

Quadrangle: Portageville.

Reason for Designation: The Wiscoy Formation marks the top of the West Falls
Group & this locality contains the contact between the Wiscoy/Dunkirk formations
West Falls / Canadaway groups that coincides with the Frasnian/Famennian boundary & the mass extinction
event that occurs at that boundary. The large, well exposed surfaces are excellent for studying many
different aspects of the depositional environment of the Late Devonian up to the
5th largest mass-extinction in Earth's history.