U.S. Geological Survey Home AASG Logo USGS HOME CONTACT USGS SEARCH USGS
National Geologic Map Database

Geologic Unit: Brimfield

Usage:

Brimfield Schist (CT*,MA*)
Brimfield Group (CT*,MA*-recognized locally in type area)


Subunits:

GROUP STATUS (alphabetical): Bigelow Brook Formation (CT*), Hamilton Reservoir Formation (CT*,MA*), Mount Pisgah Formation (CT*,MA*).
FORMATION STATUS: Daly Swamp Member (CT*).


Geologic age:

Cambrian(?)*
Ordovician(?)*


Type section, locality, area and/or origin of name:

Named from occurrence at Brimfield, Hampden Co., south-central MA (Emerson, 1898).


AAPG geologic province:

New England province*


For more information, please contact Nancy Stamm, Geologic Names Committee Secretary.

Asterisk (*) indicates published by U.S. Geological Survey authors.

"No current usage" (†) implies that a name has been abandoned or has fallen into disuse. Former usage and, if known, replacement name given in parentheses ( ).

Slash (/) indicates name conflicts with nomenclatural guidelines (CSN, 1933; ACSN, 1961, 1970; NACSN, 1983, 2005, 2021). May be explained within brackets ([ ]).