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Green River Formation: Wilkins Peak Member

GREEN RIVER FORMATION Wilkins Peak Member (age about 49 Ma)--Green, brown, and gray tuffaceous sandstone, shale, and marlstone; contains evaporites in subsurface sections.
State Wyoming
Name Green River Formation: Wilkins Peak Member
Geologic age Phanerozoic | Cenozoic | Tertiary | Eocene
Primary rock type fine-grained mixed clastic
Secondary rock type mixed clastic/carbonate
Other rock types mixed clastic/volcanic; evaporite
Lithologic constituents
Major
Sedimentary > Clastic > Sandstone
Sedimentary > Clastic > Mudstone > Shale
Sedimentary > Carbonate > Marlstone
Incidental
Sedimentary > Chemical > Evaporite
Igneous > Volcanic (Pyroclastic, tuff)
Map references
Love, J.D. and Christiansen, Ann Coe, 1985, Geologic Map of Wyoming: U.S. Geological Survey.
Unit references
Love, J.D. and Christiansen, Ann Coe, 1985, Geologic Map of Wyoming: U.S. Geological Survey.
Counties Lincoln - Sublette - Sweetwater - Uinta