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Geologic Unit: Brooks
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  • Usage in publication:
    • Brooks tongue
  • Modifications:
    • Named
  • Dominant lithology:
    • Sandstone
  • 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 and as an unranked sandstone in the Rock Springs formation in the Greater Green River basin. Type locality designated in secs 30 and 31, T18N, R101W and sec 1, T17N, R102W, 3 to 5 mi south of Brooks Ranch, Sweetwater Co., WY. Is a brown to buff, fine- to medium-grained, massive resistant sandstone. Is 120 ft thick at type. Is known in the Rock Springs uplift, in the Clay basin. Grades into shale eastward and is not recognizable in the Vermilion basin. Overlies Black Butte tongue; underlies Coulson tongue (new). Is one of five named sandstones in the Rock Springs formation. Assigned to the Late Cretaceous.

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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