USGS Visual Identifier
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Geologic Unit: Nassau

Nassau Formation (NY*,VT*,MA*)
Nassau Group (VT)

Proterozoic, Late*
Cambrian, Early*
Geologic Province:
New England province*

Areal Extent:

Type Locality:
Nassau, Rensselaer Co., eastern NY (Ruedemann, 1914).

Mettawee Member (NY*,MA*,VT*). Mudd Pond Quartzite Member (NY). Zion Hill Quartzite Member (NY*). Bomoseen Graywacke Member (NY*). Rensselaer Graywacke Member (NY*). Truthville Member (NY).

Unit Name History:
Named Nassau beds (Ruedemann and Cushing, 1914).
Revised to Nassau Quartzite; Age modified (Ruedemann, 1942).
Revised to Nassau Formation; Extended into VT (Fowler, 1950).
Age modified (Arnow, 1951).
Age modified; Extended into MA (Ratcliffe, 1974).
Age modified (Ratcliffe, 1979).
MA State Geol. Map usage (Zen and others, 1983).
Rank raised (Baldwin and Raiford, 1987).
Areal limits (Thompson, 1990; Ratcliffe and others, 1993).

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