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 ([ ]).