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Geologic Unit: Washington
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Map showing publication footprint
  • Usage in publication:
    • Washington Gneiss*
  • Modifications:
    • Overview
  • AAPG geologic province:
    • New England province
NGMDB
Map showing publication footprint
  • Usage in publication:
    • Washington Gneiss*
  • Modifications:
    • Overview
  • AAPG geologic province:
    • New England province
Publication: Summary:

Dacitic metavolcanics are found within Washington Gneiss of Berkshire massif of MA (Ratcliffe and Zartman, 1968). They are interbedded with thick succession of rusty-weathering, quartz-pebble gneisses, calc-silicate rocks and garnet-sillimanite schist similar to, but much thicker than, the rusty-weathering gneiss and schist unit of Mount Holly Complex exposed in Green Mountains of VT. It is possible that the metadacitic and metatrondhjemitic suite of VT constitutes a lateral, south-to-north facies of the Washington Gneiss of MA.

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 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 ([ ]).

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