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Map showing publication footprint
  • Usage in publication:
    • Soap Creek bentonite bed*
  • Modifications:
    • First used
  • Dominant lithology:
    • Bentonite
  • AAPG geologic province:
    • Central Montana uplift
Publication:

Richards, P.W., and Rogers, C.P., Jr., 1951, Geology of the Hardin area, Big Horn and Yellowstone Counties, Montana: U.S. Geological Survey Oil and Gas Investigations Map, OM-111, 2 sheets, scale 1:63,360, Reprinted 1975


Summary:

First published use as a name for an 8 ft thick olive-green bentonite at the top of Frontier formation of Colorado group. Intent to name, source of name, and designation of a type locality not stated. Overlies unnamed gray sandy shale of Frontier. Underlies dark gray shale of lower member of Cody shale. Identified on a columnar section. Late Cretaceous age.

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


Map showing publication footprint
  • Usage in publication:
    • Soap Creek Bentonite Bed*
  • Modifications:
    • Areal extent
  • AAPG geologic province:
    • Powder River basin
Publication:

Merewether, E.A., 1980, Stratigraphy of mid-Cretaceous formations at drilling sites in Weston and Johnson Counties, northeastern Wyoming, IN Paleontology and stratigraphy of mid-Cretaceous rocks-northeastern Wyoming: U.S. Geological Survey Professional Paper, 1186-A, p. A1-A25. [Available online from the USGS PubsWarehouse: http://pubs.er.usgs.gov/pubs/pp/pp1186A]


Summary:

Geographically extended from northwest WY to Kaycee in Johnson Co, WY on the west side of the Powder River basin where it is in the upper part of the Belle Fourche Member of the Frontier Formation. Overlies and underlies unnamed parts of the Belle Fourche. Of Late Cretaceous age.

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


Map showing publication footprint
  • Usage in publication:
    • Soap Creek Bentonite Bed*
  • Modifications:
    • Biostratigraphic dating
  • AAPG geologic province:
    • Wind River basin
Publication:

Cobban, W.A., 1990, Ammonites and some characteristic bivalves from the Upper Cretaceous Frontier Formation, Natrona County, Wyoming, IN Evolution of sedimentary basins; Powder River basin: U.S. Geological Survey Bulletin, 1917-B, p. B1-B13.


Summary:

Is recognized as a bed in the Belle Fourche Member of the Frontier Formation in northwestern Natrona Co, WY [Wind River basin]. Ammonite zonal index species ACANTHOCERAS AMPHIBOLUM Morrow is identified from a sandstone bed overlying the bentonite bed at two localities: 1) USGS Mesozoic locality D12959, NE1/4 sec 34, T39N, R83W; and 2) D13042, NE1/4 NE1/4 NE1/4 sec 34, T39N, R83W. A. AMPHIBOLUM zone is fifth of six (ascending) middle Cenomanian ammonite zones in the U.S. Western Interior. Age is middle Cenomanian (Late Cretaceous).

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


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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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