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Geologic Unit: Belmont
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Map showing publication footprint
  • Usage in publication:
    • Belmont diorite porphyry dikes and sheets
    • Belmont porphyry*
  • Modifications:
    • Original reference
  • Dominant lithology:
    • Porphyry
  • AAPG geologic province:
    • Montana folded belt
Publication:

Barrell, Joseph, 1907, Geology of the Marysville mining district, Montana; a study of igneous intrusion and contact metamorphism: U.S. Geological Survey Professional Paper, 57, 178 p., (incl. geologic map, scale 1:31,250) [http://ngmdb.usgs.gov/Prodesc/proddesc_4618.htm]


Summary:

Belmont diorite porphyry dikes and sheets. Later than Marysville batholith. [Mapped on and around Mount Belmont, 1 mile west of Marysville, Marysville district, central western Montana. The Marysville batholith is probably late Cretaceous or Tertiary, and may be as young as Miocene. Personal communication of J.T. Pardee.]
[Belmont porphyry adopted by the USGS.]

Source: US geologic names lexicon (USGS Bull. 896, p. 156).


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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