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Geologic Unit: Granby
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Map showing publication footprint
  • Usage in publication:
    • Granby tufa*
  • Modifications:
    • Named
  • Dominant lithology:
    • Diabase
  • AAPG geologic province:
    • Hartford basin
    • New England province
Publication:

Emerson, B.K., 1891, On the Triassic of Massachusetts: Geological Society of America Bulletin, v. 2, p. 451-456.


Summary:

Granby tufa is named for diabase tufa in the Triassic basin in MA.

Source: GNU records (USGS DDS-6; Reston GNULEX).


Map showing publication footprint
  • Usage in publication:
    • Granby tuff*
  • Modifications:
    • Revised
    • Redescribed
  • Dominant lithology:
    • Tuff
    • Sandstone
  • AAPG geologic province:
    • Hartford basin
    • New England province
Publication:

Emerson, B.K., 1898, Holyoke folio, Massachusetts-Connecticut: U.S. Geological Survey Geologic Atlas of the United States Folio, GF-50, 8 p., scale 1:125,000


Summary:

Granby tuff is bedded black tuff and tuffaceous sandstone varying from fine-grained volcanic sandstone to coarse diabase breccia derived from volcanic debris and granitic gneiss.

Source: GNU records (USGS DDS-6; Reston GNULEX).


Map showing publication footprint
  • Usage in publication:
    • Granby tuff
  • Modifications:
    • Revised
    • Redescribed
  • Dominant lithology:
    • Tuff
    • Diabase
  • AAPG geologic province:
    • Hartford basin
    • New England province
Publication:

Balk, Robert, 1957, Geology of [the] Mount Holyoke quadrangle, Massachusetts: Geological Society of America Bulletin, v. 68, no. 4, p. 481-504.


Summary:

A series of tuffs with interbedded tuffaceous sandstone and conglomerate, diabase, and intrusive pipes, dikes, and sills is referred to as the Granby tuff. It consists of four units: Granby tuff of Emerson (1898), a brown, purple, or maroon diabase tuff or tuffaceous sandstone; the Hampden diabase of Emerson (1898); numerous intrusive diabase pipes, dikes, and sills; and Black Rock diabase breccia dike of Emerson (1898).

Source: GNU records (USGS DDS-6; Reston GNULEX).


Map showing publication footprint
  • Usage in publication:
    • Granby Basaltic Tuff*
  • Modifications:
    • Overview
  • AAPG geologic province:
    • Hartford basin
    • New England province

Map showing publication footprint
  • Usage in publication:
    • Granby Basaltic Tuff*
  • Modifications:
    • Revised
    • Redescribed
  • AAPG geologic province:
    • Hartford basin
    • New England province
Publication:

Robinson, Peter, and Luttrell, G.W., 1985, Revision of some stratigraphic names in central Massachusetts, IN Stratigraphic notes, 1984: U.S. Geological Survey Bulletin, 1605-A, p. A71-A78.


Summary:

Granby Tuff is renamed Granby Basaltic Tuff to reflect the composition of this friable, well-bedded tuff containing sediment fragments. Assigned to Newark Supergroup.

Source: GNU records (USGS DDS-6; Reston GNULEX).


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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 ([ ]).