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Map showing publication footprint
  • Usage in publication:
    • Highwood syenite*
  • Modifications:
    • Areal extent
  • Dominant lithology:
    • Syenite
  • AAPG geologic province:
    • Sweetgrass arch
Publication:

Weed, W.H., 1899, Fort Benton folio, Montana: U.S. Geological Survey Geologic Atlas of the United States Folio, GF-55, 7 p.


Summary:

Highwood syenite. Light-colored coarsely granular feldspathic rocks of Highwood Peak and neighboring laccoliths. Southern part of Highwood Peak is composed of a very typical syenite. Age is Eocene(?).

Source: US geologic names lexicon (USGS Bull. 896, p. 957).


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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