Fort Union Fm

Shale, sandstone, and local coal beds
State Colorado
Name Fort Union Fm
Geologic age Tertiary
Lithologic constituents
Major
Sedimentary > Clastic > Mudstone > Shale
Sedimentary > Clastic > Sandstone
Minor
Sedimentary > Coal (Bed)
References

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

NGMDB product
Counties Moffat - Rio Blanco - Routt