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Geologic Unit: Hell Gate
Map showing publication footprint
  • Usage in publication:
    • Hell Gate Porphyry
  • Modifications:
    • Not used
Publication:

Tweto, Ogden, and Pearson, R.C., 1964, St. Kevin Granite, Sawatch Range, Colorado; Article 127, IN Geological Survey Research 1963; short papers in geology and hydrology; Articles 122-170: U.S. Geological Survey Professional Paper, 475-D, p. D28-D32. [Available online from the USGS PubsWarehouse: http://pubs.er.usgs.gov/pubs/pp/pp475D]


Summary:

Term Hellgate Porphyry replaced. Hell Gate is just a textural or coarse porphyritic facies of Precambrian St. Kevin Granite (new). Term "coarse porphyritic facies" used in place of Hell Gate Porphyry of Southern Rocky Mountain region.

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


Map showing publication footprint
  • Usage in publication:
    • Hell Gate Porphyry
  • Modifications:
    • Overview
  • AAPG geologic province:
    • Southern Rocky Mountain region
Publication:

Tweto, Ogden, 1977, Nomenclature of Precambrian rocks in Colorado, IN Contributions to stratigraphy: U.S. Geological Survey Bulletin, 1422-D, p. D1-D22.


Summary:

Obsolete. Is one of several facies of St. Kevin Granite. Occurs in Sawatch Range, Southern Rocky Mountain region. Listed with granitic rocks and gabbro of circa 1,400 m.y. (Precambrian Y) age group.

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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