USGS Visual Identifier
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Geologic Unit: Tadmuck Brook

Usage:
Tadmuck Brook Schist (MA*)

Age:
Precambrian*
Proterozoic, Late*
Ordovician*
Silurian(?)*
Geologic Province:
New England province*



Areal Extent:
MA*




Type Locality:
Area on both sides of Tadmuck Brook in town of Westford, delineated on southeast side by upper forks of brook and on northwest side by Lowell Road, Westford quadrangle, Middlesex Co., central MA (Bell and Alvord, 1976).

Unit Name History:
Named (Bell and Alvord, 1976).
Age modified (Goldsmith and others, 1982).
MA State Geol. Map usage (Zen and others, 1983).
Overview (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