USGS Visual Identifier
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Geologic Unit: Squam

Squam Granite of Cape Ann Complex (MA*)

Ordovician, Late*
Silurian, Early*
Geologic Province:
New England province*

Areal Extent:

Type Locality:
Occurs along Squam River and in Danvers, Essex Co., northeastern MA (Clapp, 1910).

Unit Name History:
First used (Clapp, 1910).
Named, attributed to Clapp (Emerson, 1917).
Assigned to Cape Ann Complex; Age modified (Goldsmith and others, 1982).
MA State Geol. Map usage (Zen, 1983).
Overview (Wones and Goldsmith, 1991).
Not used (Dennen, 1991).
Overview (Hon 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