- Usage in publication:
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- Spruce Creek Formation
- Modifications:
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- Named
- Dominant lithology:
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- Conglomerate
- AAPG geologic province:
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- Alaska West-Central region
Summary:
Named from exposures at head of Spruce Creek, headwaters of Kugruk River, Type locality designated as these exposures at head of Spruce Creek (T1N R19W) Bendeleben quad, Seward Peninsula, AK. Also underlies isolated hills along east front of Darby Mountains in southeastern part of Bendeleben quad. Is thick cobble conglomerate that mostly consists of clasts of limestone and dolomite with subordinate clasts of volcanic rocks, chloritic schists and York Slate. Is at least 200 ft thick. Overlies metavolcanic rocks of Jurassic age and carbonate rocks of Paleozoic age. Underlies thrust of Paleozoic rocks. May be assigned to Paleozoic age because of predominance of limestone but also may be probable Cretaceous age.
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 ([ ]).