- Usage in publication:
-
- Gold Ace Limestone Member*
- Modifications:
-
- Named
- Biostratigraphic dating
- Dominant lithology:
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- Limestone
- Mudstone
- AAPG geologic province:
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- Great Basin province
Summary:
Pg. 13-14. Gold Ace Limestone Member of Carrara Formation. Name proposed for the 4th from lowermost member (of 9). Present in southern Nevada and southeastern California. Is dark-gray microspar limestone deposited as lime mudstone; is thin- to medium-bedded, cliff-forming, burrowed and oncolitic; contains trilobite fragments of OLENELLUS PUERTOBLANCOENSIS (Lochman) and O. HOWELLI? (Meek). Thickness 46 m at type section; ranges from <1 to 103 m. Gradationally overlies Echo Shale Member (new) and underlies with sharp contact Pyramid Shale Member (new), both of Carrara Formation. Age is Early Cambrian. (Gold Ace Limestone Member of Carrara Formation adopted by the USGS.)
Type section: exposures in canyon 0.8 km northwest of Carrara Canyon, near Gold Ace mine, Bare Mountain 15-min quadrangle, Nye Co., southern NV. Named from Gold Ace mine.
Source: GNU records (USGS DDS-6; Menlo GNULEX); US geologic names lexicon (USGS Bull. 1564, p. 67); Changes in stratigraphic nomenclature, 1979 (USGS Bull. 1502-A, p. A31).
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 ([ ]).