- Usage in publication:
-
- Stillwater formation
- Modifications:
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- Revised
- AAPG geologic province:
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- Chautauqua platform
Summary:
Revised as basal formation (of 6) of Enid group (raised in rank). Consists of a series of red and gray sandstones and red shales exposed in a zone extending north and south across east-central OK on the Chautauqua platform. Thickness in this area is about 800 ft. Equivalents of the Stillwater in southern KS and in Osage and Kay Cos, OK consist of a series of limestones and shales belonging to the "Flint Hills." Base placed at top of Cottonwood limestone. Underlies Wellington formation of Enid group. Geologic map of north-central OK. Stratigraphic table. Of Permian age.
Source: GNU records (USGS DDS-6; Denver 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 ([ ]).