USGS Visual Identifier
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Geologic Unit: Poplar Mountain

Poplar Mountain Gneiss (MA*)

Proterozoic, Late*
Geologic Province:
New England province*

Areal Extent:

Type Locality:
Exposures on Poplar Mountain, 1 mi northeast of Millers Falls, Millers Falls 7.5-min quadrangle, north-central MA (Balk, 1956).

Unit Name History:
First used (Willard, 1951).
Named; Age modified (Balk, 1956).
Revised; Age modified (Ashenden, 1973).
Age modified (Ashwal and others, 1979).
MA State Geol. Map usage (Zen and others, 1983).
Age and stratigraphic relations discussed (Robinson and Luttrell, 1985).

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