Usage:
Bristol Member of Collinsville Formation (CT*,MA*)
Bristol Gneiss (CT*)
Geologic age:
Middle Ordovician*
Type section, locality, area and/or origin of name:
Type area: town of Bristol, Hartford Co., central CT (Gregory, 1906).
Type locality: Pennsylvania Central RR (formerly New York, New Haven, and Hartford RR) cut on south side of St. Thomas Cemetery near center of Bristol quadrangle (Simpson, 1990).
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 ([ ]).