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- Usage in publication:
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- Slough Creek Member*
- Modifications:
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- Named
- Dominant lithology:
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- Tuff
- AAPG geologic province:
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- Yellowstone province
- Montana folded belt
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 ([ ]).