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  • Usage in publication:
    • Slough Creek Member*
  • Modifications:
    • Named
  • Dominant lithology:
    • Tuff
  • AAPG geologic province:
    • Yellowstone province
    • Montana folded belt
Publication:

Smedes, H.W., and Prostka, H.J., 1972, Stratigraphic framework of the Absaroka Volcanic Supergroup in the Yellowstone National Park region, IN Geology of Yellowstone National Park: U.S. Geological Survey Professional Paper, 729-C, p. C1-C33. [Available online from the USGS PubsWarehouse: http://pubs.er.usgs.gov/pubs/pp/pp729C]


Summary:

Named as a member in middle of Mount Wallace Formation (new) of Sunlight Group (new) of Absaroka Volcanic Supergroup (new) for Slough Creek (p. C12-C13), Yellowstone National Park, Yellowstone province, WY. Type area is west of Slough Creek 2 mi south of Yellowstone Park boundary. Also occurs along Buffalo Creek (p. C12-C13), Yellowstone province and Montana folded belt province, MT. Is a composite sheet of welded rhyodacite ash-flow tuff. Is a distinctive, well-exposed continuous unit as much as 1,000 ft thick near middle of formation. Is a compound cooling unit in which ash flows contain variable proportions of quartz, sanidine, and biotite phenocrysts. Is of early Bridgerian, middle 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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