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Geologic Unit: Newbury

Newbury Volcanic Complex (MA*)
Newbury Formation (MA*)

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

Areal Extent:

Type Locality:
Occurrences in towns of Rowley and Newbury, Essex Co., northeastern MA (McDaniel, 1884).

Unit Name History:
Named Newbury felsite (McDaniel, 1884).
Revised to Newbury Volcanic Complex (Emerson, 1917).
Not used (Clapp, 1921).
Overview; Age modified (LaForge, 1932).
Used as Newbury Formation; Age modified (Toulmin, 1964).
Age modified; Biostratigraphic dating (Cuppels, 1966).
Age modified (Castle and others, 1976).
Age modified; Overview (Shride, 1976).
Overview (Billings, 1976).
MA State Geol. Map usage (Zen and others, 1983).
Overview (Goldsmith, 1991).

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