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Geologic Unit: Coulson
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  • Usage in publication:
    • Coulson tongue
  • Modifications:
    • Named
  • Dominant lithology:
    • Shale
    • Coal
  • AAPG geologic province:
    • Green River basin
Publication:

Smith, J.H., 1961, A summary of stratigraphy and paleontology upper Colorado and Montanan Groups south-central Wyoming, northeastern Utah, and northwestern Colorado, IN Wiloth, G.J., and others, eds., Symposium on Late Cretaceous rocks, Wyoming and adjacent areas: Wyoming Geological Association Field Conference Guidebook, no. 16, p. 101-112.


Summary:

Named as a tongue of the Rock Springs formation for Coulson Ranch. Type locality selected in sec 13, T14N, R104W, Sweetwater Co., WY in the Greater Green River basin. Consists of gray and brown, sometimes coaly to carbonaceous shales. Has coal beds 3 to 4 ft thick on the west side of the Rock Springs uplift. Has an average thickness of 80-100 ft. Overlies the Brooks tongue (new); underlies the McCourt sandstone (new unranked unit). Is of Late Cretaceous 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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