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Rico and Hermosa Fms

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Arkosic sandstone, conglomerate, shale, and limestone. Includes at base in some areas siltstone and shale of Molas Fm or Larsen Quartzite
State Colorado
Name Rico and Hermosa Fms
Geologic age Pennsylvanian
Lithologic constituents
Major
Sedimentary > Clastic > Conglomerate
Sedimentary > Clastic > Mudstone > Shale
Sedimentary > Clastic > Sandstone > Arkose
Minor
Sedimentary > Clastic > Siltstone
Sedimentary > Carbonate > Limestone
References

Tweto, Ogden, 1979, Geologic Map of Colorado: U.S. Geological Survey Special Geologic Map, scale 1:500,000.
NGMDB product
Counties Archuleta - Dolores - Hinsdale - La Plata - San Juan