Collinsville Formation (CT*,MA*)
Bristol (CT*,MA*) and Sweetheart Mountain (CT*,MA*). Members; unnamed hornblende gneiss member (CT), unnamed metaquartzite member (CT)
Between highest and lowest water level of Nepaug Reservoir, on southern face of Sweetheart Mountain, near village of Collinsville, Canton Twp., Hartford Co., northern central CT (Gregory, 1906).
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 ([ ]).