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Morrison, Curtis, Entrada, and Glen Canyon Fms

Curtis is absent along Grand Hogback
State Colorado
Name Morrison, Curtis, Entrada, and Glen Canyon Fms
Geologic age Phanerozoic | Mesozoic | Triassic Jurassic
Primary rock type mudstone
Secondary rock type sandstone
Other rock types
Lithologic constituents
Major
Sedimentary > Clastic > Sandstone
Sedimentary > Clastic > Mudstone
Sedimentary > Clastic > Mudstone > Claystone
Minor
Sedimentary > Clastic > Siltstone
Sedimentary > Clastic > Mudstone > Shale
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.
Counties Garfield - Moffat - Rio Blanco