Iles Fm

Sandstone and shale. Trout Creek Sandstone Member at top; coal beds in upper half
State Colorado
Name Iles Fm
Geologic age Cretaceous
Lithologic constituents
Sedimentary > Clastic > Mudstone > Shale
Sedimentary > Clastic > Sandstone
Sedimentary > Coal (Bed)

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

NGMDB product
Counties Garfield - Moffat - Rio Blanco - Routt