- Usage in publication:
-
- Mullinix formation
- Modifications:
-
- Original reference
- Dominant lithology:
-
- Phyllite
- AAPG geologic province:
-
- Great Basin province
Summary:
Pg. 1388-1389, pl. 1 (geol. map). Mullinix formation. Thick sequence of laminated to massive siliceous (silty and sandy) phyllites. Thickness about 5,000 feet. Major faulting has removed top of unit. Shown on geologic map of Santa Rosa Range in contact with porphyroblastic fine-grained rocks. Overlies Andorno formation (new) with contact gradational. No fossils. Age is considered Late Triassic(?).
Named for exposures in hilly ground west of Tertiary volcanic rocks between Mullinix and Solid Silver Canyons, Santa Rosa Range, Winnemucca area, north central NV.
Source: U.S. Geologic Names Lexicon (USGS Bull. 1200, p. 2655); GNU records (USGS DDS-6; Menlo GNULEX).
- Usage in publication:
-
- Mullinix Formation*
- Modifications:
-
- Age modified
- Revised
- AAPG geologic province:
-
- Great Basin province
Summary:
Included as youngest formation in Auld Lang Syne Group (new). Type area of Compton (1960) here redesignated as type locality: secs.17 and 20, T43N R39E, Hinkey Summit 15' quad, Humboldt Co, NV. Occurs in south Santa Rosa Range. Overlies Andorno Formation. Overlain unconformably by Tertiary volcanic rocks. Age is Late Triassic and/or Jurassic on basis of lack of fossils in 5000 ft or more in Mullinix Formation and apparently short duration of Rhaetian age (Silberling and Tozer, 1968).
Source: GNU records (USGS DDS-6; Menlo 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 ([ ]).