- Usage in publication:
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- Baker Lake porphyry
- Modifications:
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- Original reference
- Dominant lithology:
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- Porphyry
- AAPG geologic province:
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- South Park basin
Summary:
Pg. 83, pl. 1. Baker Lake porphyry. Quartz monzonite porphyry, coarser and darker gray than typical Eshe porphyry. Block jointing has broken rock units into slabs from a few inches to a few feet in diameter. Talus obscures contacts with surrounding sediments. Age is Tertiary. Report includes geologic map.
Exposed in northwestern part of South Park, in secs. 17, 19, 20, 28, 29, and 30, T. 7 S., R. 75 W., and in secs. 24 and 25, T. 7 S., R. 76 W., Park Co., central CO. Outcrop is 4 mi long and averages 0.5 mi wide. Central part of outcrop has been eroded to a depression which now holds Baker Lake.
Source: US geologic names lexicon (USGS Bull. 1200, p. 196).
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 ([ ]).