- Usage in publication:
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- Davidson evaporite
- Modifications:
-
- Named
- Dominant lithology:
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- Salt
- Anhydrite
- Dolomite
- AAPG geologic province:
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- Williston basin
Summary:
Named as a formation in the upper part of the Manitoba group (new) for occurrence in the Imperial Davidson No. 1 well (the type section) in sec 8, T27N, R1W, SA, CN, Williston basin. Occurs about 100 ft above the Dawson Bay formation, basal formation of the Manitoba. Consists of 200 ft of salt overlain by 30 to 50 ft of anhydrite. The anhydrite grades upward into anhydritic dolostone. Lies between 3,830 and 4,100 ft in the type well where the upper 110 ft consists of anhydrite and grayish-yellow finely crystalline dolomite, and the lower 160 ft is salt. Over lies and underlies unnamed parts of the Manitoba group. Correlation chart. Devonian age. May be Middle Devonian or may be Late Devonian, or may be both. Cross sections. Well-log descriptions.
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 ([ ]).