Usage:
Assabet Quartz Diorite (MA*)
Geologic age:
Silurian*
Type section, locality, area and/or origin of name:
Type locality: on Hill 272 in northeast corner of Maynard. The main tongue-shaped mass of rock extends from Maynard northeastward into Concord quadrangle, north-central MA. Named from exposures near Assabet River in town of Maynard (Hansen, 1956).
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 ([ ]).