Gypsum Springs Formation

Gypsum Springs Formation
Stratigraphic range: Middle Jurassic
Type Geological 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

  1. 1 2 3 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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