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- Usage in publication:
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- Black Hill rhyolite
- Modifications:
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- Original reference
- Dominant lithology:
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- Rhyolite
- AAPG geologic province:
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- Eagle basin
Summary:
Pg. 349. Black Hill rhyolite. Almost wholly quartz and feldspar. Recognized in Black Hill region, Colorado. Age is Tertiary.
Forms Black Hill, about 18 mi southeast of Leadville, Lake Co., CO
Source: US geologic names lexicon (USGS Bull. 896, p. 202).
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 ([ ]).