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Geologic Unit: Nahant

Usage:
Nahant Gabbro (MA*)

Age:
Ordovician*
Geologic Province:
New England province*
Areal Extent:
MA*

Type Locality:
Nahant, Essex Co., northeastern MA (Clapp, 1910).

Unit Name History:
Named (Clapp, 1910) [Not synopsized].
Abandoned (LaForge, 1932) [Not synopsized].
Reinstated in abstract [???] (Bell and Dennen, 1972) [Not synopsized].
Age modified; Isotopic dating (Zartman, 1977) [Not synopsized].
MA State Geol. Map usage (Zen and others, 1983).
Overview; Isotopic dating (Wones and 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