Gypsum Spring Formation

{{Short description|Stratigraphical unit in the United States}}

{{Infobox rockunit

| name = Gypsum Spring Formation

| image = Devils Tower aerial.jpg

| imagesize = 350px

| caption = Gypsum Spring Formation (in grey on top of red colored Spearfish Formation), near Devils Tower National Monument (Wyoming)

| type = Geological formation

| age = {{Fossil range|Middle Jurassic|Middle Jurassic|Middle Jurassic}}

| prilithology = Gypsum

| otherlithology = Shale, dolomite, limestone

| namedfor = Gypsum Spring, Wyoming

| namedby = J.D. Love, 1939

| region = Williston Basin

| country = Canada, United States

| coordinates =

| unitof =

| subunits =

| underlies =Sundance Formation

| overlies =

| thickness = up to {{convert|76|m|ft|-1}}

| extent =

| area =

| map =

| map_caption =

|period=Middle Jurassic

}}

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.Love, J.D., 1939. Geology along the southern margin of the Absaroka Range. Wyoming. Geological Society of America, Spec. Paper 20, p. 45.