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Geologic Units: Butte
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  • Usage in publication:
    • Butte quartz monzonite*
    • Butte granite*
  • Modifications:
    • Original reference
  • Dominant lithology:
    • Granite
    • Quartz monzonite
  • AAPG geologic province:
    • Montana folded belt
Publication:

Weed, W.H., 1899, Granite rocks of Butte, Montana and vicinity: Journal of Geology, v. 7, no. 8, p. 737-750.


Summary:

Pg. 740-750. Butte granite or Butte quartz monzonite. Covers area of several sq mi and is prevailing rock of Butte district, [Silver Bow County], central western Montana, and the one that contains the world-famous copper and silver veins of that place. It is rather dark colored, coarsely granular rock. Age is Tertiary(?) (Eocene?).

Source: US geologic names lexicon (USGS Bull. 896, p. 305).


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 ([ ]).