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  • Usage in publication:
    • Squirrel Gulch latite*
  • Modifications:
    • Named
  • Dominant lithology:
    • Latite
  • AAPG geologic province:
    • San Luis basin
Publication:

Burbank, W.S., 1932, Geology and ore deposits of the Bonanza mining district, Colorado, with a section on history and production by C.W. Henderson: U.S. Geological Survey Professional Paper, 169, 166 p.


Summary:

Named for development in upper part of Squirrel Gulch, Saguache Co, CO in the San Luis basin. Is characterized by massive flows of hornblende-biotite latite. Confined to a narrow zone in west part of area. Ranges from 300-500 ft thick. Overlies Bonanza latite; intertongues and grades into Porphyry Peak rhyolite; is contemporaneous with Hayden Peak latite. Mapped (geologic map) in south-central and west part of district. Is of Tertiary age.

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


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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