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Geologic Unit: Braintree

Braintree Argillite (MA*)

Cambrian, Middle*
Geologic Province:
New England province*
Areal Extent:

Type Locality:
Braintree, Norfolk Co., MA (Shaler, 1871).

Unit Name History:
Named Braintree series (Shaler, 1871).
Revised to Braintree slates (Mansfield, 1906).
Revised to Braintree argillite (Chute, 1950).
Overview (Naylor, 1981).
MA State Geol. Map usage (Zen and others, 1983).
Overview (Goldsmith, 1991).
[When referring to the Braintree series of Shaler (1871), please use informally. The practice of employing "series" for lithostratigraphic or lithodemic nomenclature is now regarded as improper (see ACSN, 1961, 1970; NACSN, 1983). The term "Series" is applied formally only to chronostratigraphic units.]

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