Gypsum Spring Formation

Gypsum Spring Formation
Stratigraphic range: Middle Jurassic PreꞒ Ꞓ O S D C P T J K Pg N
Gypsum Spring Formation (in grey on top of red colored Spearfish Formation), near Devils Tower National Monument (Wyoming)
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	Canada, United States
Type section
Named for	Gypsum Spring, Wyoming
Named by	J.D. Love, 1939

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

It takes the name from Gypsum Spring in Wyoming, and was first described in outcrop in Freemont County by J.D. Love in 1939.^[2]

Lithology

The Gypsum Spring Formation is composed of massive white gypsum in the lower part, and alternating gypsum, red shale, dolomite and limestone. ^[1]

Distribution

The Gypsum Spring 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.

v t e Western Canada Sedimentary Basin
Hydrocarbon history	Oil sands and heavy oil Frontier exploration and development Natural gas liquids Natural gas
Depositional regions	Southern Alberta Central Alberta Northwestern Alberta Plains South-central Canadian Rockies foothills North-east Plains North-central foothills Liard River Fort Nelson Northern Rocky Mountains Fort St. John Saskatchewan Western Manitoba
Saskatchewan	Cypress Hills FM Ravenscrag FM Frenchman FM Whitemud FM Eastend FM Bearpaw FM Judith River GRP Belly River FM Oldman FM Foremost FM Lea Park FM Pakowki FM Milk River FM Colorado GRP Viking FM Mannville GRP Pense FM Cantuar FM Success FM Vanguard FM Ellis GRP Swift FM Rierdon FM Sawtooth FM Shaunavon FM Piper FM Gravelbourg FM Gypsum Springs FM Watrous FM Big Snowy GRP Madison GRP Charles FM Poplar Ratcliffe Midale Mission Canyon FM Kisbey SS Alida Tilston Lodgepole FM Souris Valley Three Forks GRP Bakken FM Big Valley FM Torquay FM Saskatchewan GRP Birdbear FM Duperow FM Manitoba GRP Souris River FM Elk Point GRP Davson Bay FM Prairie FM Winnipegosis FM Ashern FM Interlake FM Stonewall FM Stony Mountain FM Herald FM Yeoman FM Winnipeg FM Deadwood FM Canadian Shield

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