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Geologic Unit: Sharpners Pond

Sharpners Pond Diorite (MA*)
Sharpners Pond Plutonic Suite (MA)

Geologic Province:
New England province*
Areal Extent:

Type Locality:
Sharpners Pond, about 4.5 mi west of Topsfield, MA (Castle, 1965).

Unit Name History:
Named Sharpners Pond tonalite (Castle, 1965).
Age modified (Castle and Theodore, 1972).
Redescribed as Sharpners Pond Diorite; Age modified; Isotopic dating (Goldsmith and others, 1982).
MA State Geol. Map usage (Zen and others, 1983).
Overview; Isotopic dating (Wones and Goldsmith, 1991).
Revised; Areal limits (Hon and others, 1993).

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