- Usage in publication:
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- Joker Peak Member
- Modifications:
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- Named
- Biostratigraphic dating
- AAPG geologic province:
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- Great Basin province
Summary:
Unit is named the Joker Peak Member of the Sunrise Formation (revised) of the Volcano Peak Group (new). Includes the lower argillaceous part of the uppermost unit of Muller and Ferguson (1939, GSA Bull., v. 50, no. 10, p. 1573-1624) of the Sunrise Formation in the Gabbs Valley Range in west-central Nevada. Consists of medium-gray to brown mudstone and siltstone containing thin calcareous beds. Sharply and conformably overlies the New York Canyon Member (new); conformably underlies the Mina Peak Member (new), both of the Sunrise Formation; contact is drawn at the lowest limestone beds. Thickness is 30 m. Age is Early Jurassic (Pliensbachian), based on fossils.
Type locality: exposures on the southern flank of Joker Peak, Gabbs Valley Range, Mineral Co., NV.
Source: US geologic names lexicon (USGS Bull. 1565, p. 147); 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 ([ ]).