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Map showing publication footprint
  • Usage in publication:
    • Brimfield schist*
  • Modifications:
    • First used
  • Dominant lithology:
    • Schist
  • AAPG geologic province:
    • New England province
Publication:

Emerson, B.K., 1898, Geology of old Hampshire County, Massachusetts, comprising Franklin, Hampshire, and Hampden Counties: U.S. Geological Survey Monograph, 29, 790 p.


Summary:

Pg. 17, map, pl. 34. Brimfield schist. Rusty graphitic fibrolite schist. Overlies Paxton whetstone schist.

Source: US geologic names lexicon (USGS Bull. 896, p. 267).


Map showing publication footprint
  • Usage in publication:
    • Brimfield schist*
  • Modifications:
    • Principal reference
  • Dominant lithology:
    • Schist
  • AAPG geologic province:
    • New England province
Publication:

Emerson, B.K., 1917, Geology of Massachusetts and Rhode Island: U.S. Geological Survey Bulletin, 597, 289 p.


Summary:

Pg. 59, 60, 68-72, 86-87, 234-235, and map. Brimfield schist. Coarse, rusty muscovite-biotite schist, full of pyrite, graphite, fibrolite, and pink garnet. Includes coccolite limestone. Overlies Paxton quartz schist. To east becomes Worcester phyllite. Age is Carboniferous.
Named for occurrence at Brimfield, MA.

Source: US geologic names lexicon (USGS Bull. 896, p. 267).


Map showing publication footprint
  • Usage in publication:
    • Brimfield schist
  • Modifications:
    • Revised
  • AAPG geologic province:
    • New England province
Publication:

Callaghan, Eugene, 1931, A contribution to the structural geology of central Massachusetts: New York Academy of Sciences Annals, v. 33, p. 27-65.


Summary:

Pg. 29, 63-74. Brimfield schist restricted and redefined. Given significance as a formation rather than a rock type. Retained for thin layer of biotite schist that overlies Paxton feldspathic schist; the biotite schist that underlies Paxton feldspathic schist and was formerly included in Brimfield schist being here named Ware schist. The schist at Brimfield, the type locality, is this upper biotite schist. Occurs between shaft 4 and the granite and in west end of Wachusett-Coldbrook tunnel. Thickness 900 feet to east, 1,100+ feet to west. May be Carboniferous.

Source: US geologic names lexicon (USGS Bull. 896, p. 267).


Map showing publication footprint
  • Usage in publication:
    • Brimfield schist
  • Modifications:
    • Age modified
  • AAPG geologic province:
    • New England province
Publication:

Foye, W.G., and Lane, A.C., 1934, Correlations by radioactive minerals in the metamorphic rocks of southern New England: American Journal of Science, 5th series, v. 28, no. 164, p. 127-138.


Summary:

Pg. 138. Brimfield schist. Consider this formation to be pre-Carboniferous.

Source: US geologic names lexicon (USGS Bull. 896, p. 267).


Map showing publication footprint
  • Usage in publication:
    • Brimfield Schist*
  • Modifications:
    • Overview
  • AAPG geologic province:
    • New England province
Publication:

Zen, E-an (editor), Goldsmith, Richard (compiler), Ratcliffe, N.M. (compiler), Robinson, Peter (compiler), Stanley, R.S. (compiler), Hatch, N.L., Jr., Shride, A.F., Weed, E.G.A., and Wones, D.R., 1983, Bedrock geologic map of Massachusetts: U.S. Geological Survey [State Geologic Map], 3 sheets, scale 1:250,000


Summary:

Brimfield Schist of Emerson (1917) is included with rocks mapped as Partridge Formation. Partridge Formation is assigned a Middle Ordovician age.

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


Map showing publication footprint
  • Usage in publication:
    • Brimfield Group*
  • Modifications:
    • Age modified
    • Geochronologic dating
  • AAPG geologic province:
    • New England province
Publication:

Pease, M.H., Jr., 1989, Correlation of the Oakdale Formation and Paxton Group of central Massachusetts with strata in northeastern Connecticut: U.S. Geological Survey Bulletin, 1796, 26 p.


Summary:

The age of the Brimfield Group in this area is Cambrian(?) based on the intrusion of 440 my Hedgehog Hill gneiss in the top of the Hamilton Reservoir Formation in the upper part of the Brimfield, although the top of the Brimfield may be Ordovician or older Paleozoic.

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 ([ ]).

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