USGS Visual Identifier
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Geologic Unit: Black River

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

Age:
Ordovician, Middle*
Chazyan, late*
Blackriveran*
Rocklandian*





Geologic Province:
Appalachian basin*








Areal Extent:
IL*
IN*
MI*
NY*
OH*
PA*
VT*
VA*
WV*

Type Locality:
Exposures in cliffs of Black River, north-central NY (Vanuxem, 1842).

Subunits:
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*)

Unit Name History:
Named (Vanuxem, 1842).
Extended into WV (Overby, 1961).
Areal limits (Thompson, 1990).
Overview (Conkin, 1991).
Revised; Areal limits (Ryder, 1992a, 1992b).
Overview (Ryder and others, 1992).
OH Geol. Survey usage (Wickstrom and others, 1992).

Note: If you need more information, please contact Nancy Stamm (nstamm@usgs.gov).
Asterisks (*) indicate usage by the U.S. Geological Survey. Other usages by state geological surveys.

"No current usage" implies that a name has been abandoned or that it has fallen into disuse. Former usage and, if known, replacement name given in parentheses ().

Slashes (/) indicate unit name usage violates the 1983 North American Stratigraphic Code. This violation may be explained within brackets ([ ]).






U.S. Department of the Interior, U.S. Geological Survey, Reston, VA, USA
URL http://ngmdb.usgs.gov/ngmdb/ngm_catalog.ora.html
Database project personnel
Last modified: 15-Jan-2013