Usage:
Billerica Schist Member of Nashoba Formation (MA*)
Geologic age:
Neoproterozoic or Ordovician*
Type section, locality, area and/or origin of name:
Southeast side of Fox Hill, and along Concord River from where U.S. Highway 3 crosses river southwest to vicinity of Riverside, in town of Billerica, Billerica quadrangle, Middlesex Co., MA (Bell and Alvord, 1976).
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 ([ ]).