- Usage in publication:
-
- McNulty Gulch rhyolite
- Modifications:
-
- Original reference
- Dominant lithology:
-
- Rhyolite
- AAPG geologic province:
-
- Eagle basin
Summary:
Pg. 350. McNulty Gulch rhyolite. Light-colored; numerous pinkish quartz crystals, white glassy feldspars, and brown biotite leaves, with subordinate gray groundmass between them. Recognized in Tenmile district, western central Colorado. Age is Eocene.
Named from occurrence in one large and several small bodies at head of McNulty Gulch, which runs north and enters Tenmile River at Carbonateville, Tenmile district, Summit Co., western central CO.
[Called McNulty rhyolite by S.F. Emmons, 1898.]
Source: US geologic names lexicon (USGS Bull. 896, p. 1260).
- Usage in publication:
-
- McNulty rhyolite
- Modifications:
-
- Original reference
- Dominant lithology:
-
- Rhyolite
- AAPG geologic province:
-
- Eagle basin
Summary:
McNulty rhyolite. Cuts both Lincoln and Quail porphyry. Occurs in small irregular masses in McNulty Gulch and extends to south; in Tenmile district, western central Colorado. Age is Eocene.
[Called McNulty Gulch rhyolite by Whitman Cross, 1886.]
Source: US geologic names lexicon (USGS Bull. 896, p. 1260).
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 ([ ]).