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  • Usage in publication:
    • Black Sulphur Tongue*
  • Modifications:
    • Named
  • Dominant lithology:
    • Marlstone
  • AAPG geologic province:
    • Piceance basin
Publication:

Duncan, D.C., Hail, W.J., Jr., O'Sullivan, R.B., and Pipiringos, G.N., 1974, Four newly named tongues of Eocene Green River Formation, northern Piceance Creek basin, Colorado, IN Contributions to stratigraphy: U.S. Geological Survey Bulletin, 1394-F, p. F1-F13.


Summary:

Named for Black Sulphur Creek, Rock School quad, Rio Blanco Co., CO as a tongue of Green River Formation. Type section in NW1/4 SW1/4 SW1/4 sec 23, T2S, R98W in the Piceance basin. Is a light-gray marlstone, 20-60 ft thick that crops out in the central part of the oil-shale basin. Is 30 ft thick at type. Overlies and underlies Uinta Formation. Changes gradationally to siltstone in northern Greasewood quad where it is indistinguishable from Uinta Formation. Merges with main body of Green River in No Name Ridge quad. Assigned an Eocene 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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