USGS Visual Identifier
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Geologic Unit: Worcester

Usage:
Worcester Formation (MA*)
Worcester Phyllite (MA)

Age:
Devonian, Early*
Silurian*
Geologic Province:
New England province*

Areal Extent:
MA*


Type Locality:
Exposures at Worcester, eastern MA, and over broad area in north part of Worcester Co. (Emerson, 1889).

Unit Name History:
Named Worcester phyllite (Emerson, 1889).
Age discussed (White, 1912).
Redescribed (Emerson, 1917).
Revised to Worcester Formation, informally subdivided (Hansen, 1956).
Age discussed (Zartman and others, 1965).
Age modified; Name variation (Castle and others, 1976).
Age modified; Biostratigraphic dating (Grew, 1970).
Age modified (Robinson, 1978).
Revised; Redescribed; Age modified; Stratigraphic relations discussed (Goldsmith and others, 1982).
MA State Geol. Map usage (Zen and others, 1983).

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