USGS Visual Identifier
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Geologic Unit: Selby

Selby Formation (VT)
Selby Limestone (NY*)
Selby Limestone of Black River Group (NY)
Selby Member of Chaumont Formation (NY)

Ordovician, Middle*
Geologic Province:
Appalachian basin*
Areal Extent:

Type Locality: (See Canadian Lexicon)
Type section: 1 mi north of Napanee Station, along Selby Creek in Lot 22, Conc. III, Richmond Twp., Lennox and Addington Cos., southern Ontario, Canada (Kay, 1937).

Unit Name History:
Name proposed for member of Rockland formation (Kay, 1937).
Rank raised to Selby Limestone (Fisher, 1962).
Assigned to Trenton Group (Cameron, 1969).
Assigned to Black River Group (Cameron and Mangion, 1977).
Overview (Fisher, 1977; Frey, 1995).

Note: If you need more information, please contact Nancy Stamm (
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
Database project personnel
Last modified: 15-Jan-2013