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Morrison Fm and Wanakah Fm (Junction Creek Sandstone Member at or near top; Pony Express Limestone Member at base)

Wanakah Fm: Sandstone, shale, limestone, and local gypsum
StateColorado
NameMorrison Fm and Wanakah Fm (Junction Creek Sandstone Member at or near top; Pony Express Limestone Member at base)
Geologic agePhanerozoic | Mesozoic | Jurassic
Original map labelJmw
Primary rock typemudstone
Secondary rock typesandstone
Other rock typeslimestone; evaporite
Lithologic constituents
Major
Sedimentary > Clastic > Mudstone
Sedimentary > Clastic > Mudstone > Claystone
Minor
Sedimentary > Carbonate > Limestone
Sedimentary > Clastic > Mudstone > Shale
Sedimentary > Clastic > Sandstone
Incidental
Sedimentary > Chemical > Evaporite > Gypsum
Map references
Tweto, Ogden 1979, Geologic Map of Colorado: U.S. Geological Survey Special Geologic Map, scale 1:500,000.
Unit references
Tweto, Ogden 1979, Geologic Map of Colorado: U.S. Geological Survey Special Geologic Map, scale 1:500,000.
Geographic coverageArchuleta - Gunnison - Montrose

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