- Usage in publication:
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- Moonshine Creek Formation*
- Modifications:
-
- Named
- Biostratigraphic dating
- Dominant lithology:
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- Siltstone
- Sandstone
- AAPG geologic province:
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- Alaska Southern region
Summary:
Named for exposures along Moonshine Creek in McCarthy C-4 quad, southern Wrangell Mountains, southern AK, designated as type area. Widely distributed in southwestern part of McCarthy C-4 quad; also recognized in McCarthy C-5 and B-4 quads. Consists of siltstone and sandstone. Divided into six informal units. Sandstones are mostly medium-grained and greenish gray. Is about 3500 ft thick at type. Unconformably overlies Nikolai Greenstone; locally disconformably overlies Kennicott Formation. Unconformably underlies Tertiary sedimentary rocks, Wrangell Lava, or Chititu Formation (new). Intruded by Tertiary sills and dikes. Age is Early and Late Cretaceous based on abundant ammonites and pelecypods ranging from late Albian to late Cenomanian.
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 ([ ]).