USGS Visual Identifier
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Geologic Unit: Sandy Pond

Usage:
Sandy Pond Amphibolite Member of Marlboro Formation (MA*)

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



Areal Extent:
MA*




Type Locality:
Northeast-trending rocky ridges at south and east sides of Sandy Pond, Concord quadrangle, Middlesex Co., MA (Bell and Alvord, 1976).

Unit Name History:
Named (Bell and Alvord, 1976).
Age modified (Goldsmith, 1980).
Not used on MA State Geol. Map (Zen and others, 1983).
Correlation 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