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Geologic Unit: Felchville
Map showing publication footprint
  • Usage in publication:
    • Felchville Gneiss*
  • Modifications:
    • Original reference
  • Dominant lithology:
    • Gneiss
  • AAPG geologic province:
    • New England province
Publication:

Ratcliffe, N.M., 2000, Bedrock geologic map of the Cavendish quadrangle, Windsor County, Vermont: U.S. Geological Survey Geologic Quadrangle Map, GQ-1773, 1 sheet, 19 p., scale 1:24,000


Summary:

Pg. 4, 6, 8, 10, 16, map. Felchville Gneiss of Mount Holly Complex. Massive, light-gray to whitish-gray-weathering, medium- to medium coarse-grained magnetite-biotite-microcline-quartz-plagioclase gneiss. Large conspicuous augen of well-twinned plagioclase as much as 1 cm in diameter are common. Overall unit is granodiorite to trondhjemite. Unit intrudes all units of the Mount Holly Complex, including the Cavendish Formation. U-Pb zircon data suggest an age of 1,379 +/-23 Ma (J.N. Aleinikoff, USGS, written commun., 1995; Ratcliffe and others, 1997, 89th New England Intercoll. Geol. Conf.).

Source: Publication.


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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