| 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)[1] |
| 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 |
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]
- ^ Cite error: The named reference
lexiconwas invoked but never defined (see the help page). - ^ Love, J.D., 1939. Geology along the southern margin of the Absaroka Range. Wyoming. Geological Society of America, Spec. Paper 20, p. 45.