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National Geologic Map Database
Geologic Unit: West Halifax
Map showing publication footprint
  • Usage in publication:
    • West Halifax Trondhjemite*
  • Modifications:
    • Named
  • Dominant lithology:
    • Trondhjemite
  • AAPG geologic province:
    • New England province
Publication:

Ratcliffe, N.M., and Armstrong, T.R., 1999, Bedrock geologic map of the West Dover and Jacksonville quadrangles, Windham County, Vermont: U.S. Geological Survey Miscellaneous Investigations Series Map, I-2552, 2 sheets, 30 p., scale 1:24,000 [Available online from the USGS PubsWarehouse: http://pubs.er.usgs.gov/pubs/i/i2552]


Summary:

Named the West Halifax Trondhjemite of the North River Igneous Suite for village of West Halifax, Windham Co., southeastern VT. Consists of cream-weathered, light- to dark-gray, coarse-grained, equigranular, massive, ilmenite-chlorite-epidote-muscovite-quartz-plagioclase trondhjemite with hypidiomorphic texture. Unit is intrusive into all other North River Igneous Suite rocks and the Cram Hill Formation. The West Halifax is of Ordovician and Silurian(?) age, and is younger than the Cram Hill Formation and older than the Northfield Formation.

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


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 ([ ]).