Black River Group (NY*,PA*,WV*,VA*,IN,VT*)
Black River Limestone (IL*,IN*,MI*,NY*,OH*,PA*,WV*)
Chaumont (NY), Lowville (NY*,PA*,VT), Pamelia (NY*); Watertown (NY*), Gull River (PA,NY); Isle La Motte (NY,VT), Amsterdam (NY*,VT*); Bony Falls (MI,NY); Plattin (IN), Pecatonica (IN), Lincolnshire (VA*), Peery (VA*), Ward Cove (VA*), Benbolt (VA*), Witten (VA*), Wardell (VA*)
Middle Ordovician (late Chazyan to Rocklandian)*
Named from exposures in cliffs of Black River, north-central NY (Vanuxem, 1842).
For more information, please contact Nancy Stamm, Geologic Names Committee Secretary.
Asterisk (*) indicates usage by the U.S. Geological Survey. Other usages by state geological surveys.
"No current usage" (†) implies that a name has been abandoned or has fallen into disuse. Former usage and, if known, replacement name given in parentheses ( ).
Slash (/) indicates name does not conform with nomenclatural guidelines (CSN, 1933; ACSN, 1961, 1970; NACSN, 1983, 2005). This may be explained within brackets ([ ]).