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National Geologic Map Database

Geologic Unit: Black River

Usage:

Black River Group (NY*,PA*,WV*,VA*,IN,VT*)
Black River Limestone (IL*,IN*,MI*,NY*,OH*,PA*,WV*)
Black River Formation (MI*)


Subunits:

GROUP STATUS (alphabetical): Amsterdam Limestone (NY*).


Chaumont (NY), Lowville (NY*,PA*,VT), Pamelia (NY*); Watertown (NY*), Gull River (PA,NY); Isle La Motte (NY,VT), Plattin (IN), Pecatonica (IN), Lincolnshire (VA*), Peery (VA*), Ward Cove (VA*), Benbolt (VA*), Witten (VA*), Wardell (VA*)


Geologic age:

Late Ordovician (Mohawkian)*


Type section, locality, area and/or origin of name:

Named from exposures in cliffs of Black River, north-central NY (Vanuxem, 1842).


AAPG geologic province:

Appalachian basin*
Michigan basin*
New England province*


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 ([ ]).