Morrison Fm, Summerville Fm, and Entrada Sandstone

Summerville Fm: Shale and siltstone
State Colorado
Name Morrison Fm, Summerville Fm, and Entrada Sandstone
Geologic age Jurassic
Lithologic constituents
Major
Sedimentary > Clastic > Sandstone
Sedimentary > Clastic > Mudstone
Sedimentary > Clastic > Mudstone > Claystone
Minor
Sedimentary > Clastic > Mudstone > Shale
Sedimentary > Clastic > Siltstone
References

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

NGMDB product
Counties Delta - Dolores - Mesa - Montezuma - Montrose - Ouray - San Miguel