USGS Visual Identifier
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Geologic Unit: Nashoba

Usage:
Nashoba Formation (MA*)

Age:
Precambrian*
Proterozoic, Late*
Ordovician*
Geologic Province:
New England province*


Areal Extent:
MA*



Type Locality:
Nashoba Brook, Maynard and Westford quadrangles, northeastern MA (Hansen, 1956).

Subunits:
Boxford Member, Bellows Hill Member, Billerica Schist Member, Spencer Brook Member, Tophet Swamp Gneiss Member, Nashoba Brook Member, Nagog Pond Gneiss Member, Fort Pond Member, Long Pond Gneiss Member, Beaver Brook Member.

Unit Name History:
First used (Currier and Jahns, 1952).
Named (Hansen, 1956).
Age generalized (Zartman and Marvin, 1971).
Age modified (Castle and others, 1976).
Members named; Age modified (Bell and Alvord, 1976).
Age modified; Isotopic dating (Goldsmith, 1980).
MA State Geol. Map usage (Zen and others, 1983).
Overview, age discussed (Goldsmith, 1991).
Age modified (Hepburn and others, 1993).

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