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National Geologic Map Database

Geologic Unit: Granby

Usage:

Granby Basaltic Tuff of Newark Supergroup (MA*)


Geologic age:

Jurassic, Early*


Type section, locality, area and/or origin of name:

Exposed 1.25 mi north of cemetery in Granby and 1 mi east of The Notch, Holyoke quadrangle, Hampshire Co., MA (Emerson, 1898).


AAPG geologic province:

New England province*
Hartford basin*


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 ([ ]).