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  • Usage in publication:
    • Red River formation*
  • Modifications:
    • Revised
  • AAPG geologic province:
    • Williston basin
Publication:

Ross, R.J., Jr., 1957, Ordovician fossils from wells in the Williston basin, eastern Montana, IN Contributions to general geology, 1955: U.S. Geological Survey Bulletin, 1021-M, p. M439-M510.


Summary:

Assigned to Bighorn group as lower of two formations in subsurface of Williston basin. Cores studied are from wells in Roosevelt, Dawson, Wibaux and Fallon Cos, MT. Overlies Winnipeg formation; underlies Stony Mountain formation (revised) of Bighorn. Cross section of wells; fossil description and distribution. Late Ordovician (Cincinnatian) age.

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


For more information, please contact Nancy Stamm, Geologic Names Committee Secretary.

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