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- Usage in publication:
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- Cascade Creek Andesite
- Modifications:
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- Named
- Dominant lithology:
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- Andesite
- AAPG geologic province:
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- Bighorn basin
Summary:
Pg. 69, 70-71. Cascade Creek andesite. Crops out on east side of Mount Sniffel, southern Absaroka Mountains, northwestern Wyoming. Intrudes Wiggins formation. Is an east-west-striking plug that dips 55 degrees to the south. Exposed along strike for more than three-fourths mile over a difference of elevation of about 1,000 feet and tapers from about 250 feet wide near east end to about 150 feet on west contact where it has been cross cut by a southwest-striking biotite-hornblende andesite porphyry dike near top of Mount Sniffel Ridge. Mineral composition and texture vary across width of outcrop. In southern and northern parts of plug are hornblende-biotite andesite and hornblende-pyroxene andesite, repectively, while core is dacitic andesite.
Named derived from nearby Cascade Creek.
Source: US geologic names lexicon (USGS Bull. 1350, p. 126).
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 ([ ]).