Bigelow Brook Formation of Brimfield Group (CT*)
Bigelow Brook Member of Paxton Formation (MA*)
Type section (composite): lower and middle members in lower section northeast of Black Pond fault, along line from point on Crystal Brook Pond trending N. 29 deg. W. to where unpaved road crosses quadrangle border in Eastford quadrangle, Windham Co., CT. Middle and upper members in upper section, along line from intersection of North Ashford Road and unnamed road trending N. 54 deg. W. to point northwest of Lead Mine Brook and south of Susstek Road in Westford quadrangle, Windham Co., CT (Pease, 1972).
New England province*
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Asterisk (*) indicates usage by the U.S. Geological Survey. Other usages by state geological surveys.
"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 does not conform with nomenclatural guidelines (CSN, 1933; ACSN, 1961, 1970; NACSN, 1983, 2005). This may be explained within brackets ([ ]).