USGS Visual Identifier
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Geologic Unit: Assabet

Usage:
Assabet Quartz Diorite (MA*)

Age:
Silurian*
Geologic Province:
New England province*
Areal Extent:
MA*

Type Locality:
Exposures on Hill 272 in northeast corner of Maynard. The main tongue-shaped mass of rock extends from Maynard northeastward into Concord quadrangle, north-central MA Named from exposures near Assabet River in town of Maynard (Hansen, 1956).

Unit Name History:
Named (Hansen, 1956).
Age changed (Castle and others, 1976; Goldsmith and others, 1982).
MA State Geol. Map usage (Zen and others, 1983).
Overview (Wones and Goldsmith, 1991).

Note: If you need more information, please contact Nancy Stamm (nstamm@usgs.gov).
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
URL http://ngmdb.usgs.gov/ngmdb/ngm_catalog.ora.html
Database project personnel
Last modified: 15-Jan-2013