- Usage in publication:
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- Park Run quartz monzonite
- Modifications:
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- Named
- Dominant lithology:
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- Quartz monzonite
- AAPG geologic province:
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- Northern Rocky Mountain region
Summary:
Named as an informal descriptive term for one of several small to medium-sized bodies of granite and quartz monzonite in the area of the Mullen Creek mafic complex (first used). Occurs as sills in secs 26 and 27, T13N, R79W near junction of Park Run and Illinois Creeks, Albany Co, WY in the Northern Rocky Mountain region. Intent to name and designation of a type locality not stated. The quartz monzonite sills have the general form of phacoliths that are surrounded by hornblende gneiss. In sharp contact with hornblende gneiss. Is porphyritic. Has porphyroblasts of microcline. Foliated. Geologic map. Of Precambrian 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 ([ ]).