Gypsum Spring Formation
The Gypsum Spring Formation is a stratigraphical unit of Middle Jurassic age in the Williston Basin.
| Gypsum Spring Formation | |
|---|---|
| Stratigraphic range: | |
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) |
| Lithology | |
| Primary | Gypsum |
| Other | Shale, dolomite, limestone |
| Location | |
| Region | Williston Basin |
| Country | United States |
| Type section | |
| Named for | Gypsum Spring, Wyoming |
| Named by | J.D. Love, 1939 |
It takes the name from Gypsum Spring in Wyoming, and was first described in outcrop in Freemont County by J.D. Love in 1939.
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