USGS Visual Identifier
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Geologic Unit: Amsterdam

Amsterdam Limestone of Black River Group (NY*,VT*)
Amsterdam Limestone of Trenton Group (NY,VT)
Amsterdam Member of Isle la Motte Formation (VT)

Ordovician, Middle*

Geologic Province:
Appalachian basin*
New England province*
Areal Extent:

Type Locality:
Typical section in quarry 0.5 mi east of Manny Corners, 3 mi east-northeast of Amsterdam, Montgomery Co., east-central NY (Kay, 1937). Named from exposures along the Mohawk in vicinity of Amsterdam (Ruedemann, 1910).

Unit Name History:
Named in Black River Group (Ruedemann, 1910).
Assigned to Trenton Group; Principal reference (Kay, 1937).
Revised (Fisher and Hanson, 1951).
Extended into VT (Twenhofel and others, 1954).
Revised in VT (Chisick and others, 1987).

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