Gypsum Springs Formation

The Gypsum Springs Formation is a stratigraphical unit of Middle Jurassic age in the Williston Basin.

Gypsum Springs Formation
Stratigraphic range: Middle Jurassic
TypeGeological formation
UnderliesSundance Formation
Thicknessup to 76 metres (250 ft)[1]
Lithology
PrimaryGypsum
OtherShale, dolomite, limestone
Location
RegionWilliston Basin
Country United States
Type section
Named forGypsum Springs, Wyoming
Named byJ.D. Love, 1939

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.

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References
  1. Lexicon of Canadian Geologic Units. "Gypsum Springs Formation". Retrieved 2010-02-01.
  2. Love, J.D., 1939. Geology along the southern margin of the Absaroka Range. Wyoming. Geological Society of America, Spec. Paper 20, p. 45.
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