Stump Formation, Preuss Sandstone or Redbeds, and Twin Creek Limestone

Stump Formation - Glauconitic siltstone, sandstone, and limestone. Preuss Sandstone or Redbeds - Purple, maroon, and reddish-gray sandy siltstone and claystone; contains salt and gypsum in thick beds in some subsurface sections. Twin Creek Limestone - Greenish-gray shaly limestone and limy siltstone. Includes Gypsum Spring Member.
State Wyoming
Name Stump Formation, Preuss Sandstone or Redbeds, and Twin Creek Limestone
Geologic age Middle Jurassic-Upper Jurassic
Lithologic constituents
Major
Sedimentary > Carbonate > Limestone
Sedimentary > Clastic > Sandstone
Sedimentary > Clastic > Siltstone (Glauconitic)
Minor
Sedimentary > Clastic > Mudstone > Claystone
Incidental
Sedimentary > Chemical > Evaporite > Salt
Sedimentary > Chemical > Evaporite > Gypsum
References
NGMDB product
Counties Lincoln - Sublette - Teton - Uinta