Gypsum Springs Formation
Gypsum Springs Formation Stratigraphic range: | |
---|---|
Type | Geological formation |
Underlies | Sundance Formation |
Thickness | up to 76 metres (250 ft)[1] |
Lithology | |
Primary | Gypsum |
Other | Shale, dolomite, limestone |
Location | |
Region | Williston Basin |
Country | United States |
Type section | |
Named for | Gypsum Springs, Wyoming |
Named by | J.D. Love, 1939 |
The Gypsum Springs Formation is a stratigraphical unit of Middle Jurassic age in the Williston Basin.
It takes the name from Gypsum Springs in Wyoming, and was first described in outcrop in Freemont County by J.D. Love in 1939.[2]
Lithology[]
The Gypsum Springs Formation is composed of massive white gypsum in the lower part, and alternating gypsum, red shale, dolomite and limestone. [1]
Distribution[]
The Gypsum Springs Formation reaches a maximum thickness of 76 metres (250 ft) in central Wyoming.[1] It occurs from the Black Hills in South Dakota through Wyoming and into southern Saskatchewan.
Relationship to other units[]
It is equivalent to the upper part of the Watrous Formation and the lower part of the Gravelbourg Formation in Saskatchewan.
References[]
- ^ a b c Lexicon of Canadian Geologic Units. "Gypsum Springs Formation". Retrieved 2010-02-01.
- ^ Love, J.D., 1939. Geology along the southern margin of the Absaroka Range. Wyoming. Geological Society of America, Spec. Paper 20, p. 45.
Categories:
- Stratigraphy of Saskatchewan
- Geologic formations of Montana
- Geologic formations of Wyoming
- Bajocian Stage
- Middle Jurassic Series