Morrison, Entrada, and Chinle Fms

Along southern Grand Hogback, Chinle is represented only by basal Gartra Sandstone Member
State Colorado
Name Morrison, Entrada, and Chinle Fms
Geologic age Jurassic-Triassic
Lithologic constituents
Sedimentary > Clastic > Mudstone > Claystone
Sedimentary > Clastic > Sandstone
Sedimentary > Clastic > Mudstone
Sedimentary > Clastic > Mudstone > Shale
Sedimentary > Clastic > Siltstone

Tweto, Ogden, 1979, Geologic Map of Colorado: U.S. Geological Survey Special Geologic Map, scale 1:500,000.

NGMDB product
Counties Garfield - Pitkin