USGS Visual Identifier
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Geologic Unit: Everett

Everett Formation (MA*,NY*,CT*)
Everett Schist (CT*,NY)

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

Areal Extent:

Type Locality:
Mount Everett, southwestern MA (Hobbs, 1893).

Unit Name History:
Named Everett schist (Hobbs, 1893).
NY State Geol. Map usage; Age modified (Fisher, 1961).
Assigned to Cossayuna Group in NY (Fisher, 1962).
Redescribed as Everett Formation in MA; Age modified (Zen, 1966).
Age modified (Zen and Hartshorn, 1966).
NY State Geol. Map usage (Fisher and others, 1970).
Age modified (Zen and Ratcliffe, 1971; Ratcliffe, 1974).
Extended into CT; Age modified (Gates, 1979).
Age modified (Ratcliffe, 1979).
MA State Geol. Map usage (Zen and others, 1983).
CT State Geol. Map usage (Rodgers, 1985).

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