Uncompahgre Fm

Quartzite, slate, and phyllite
State Colorado
Name Uncompahgre Fm
Geologic age Early-Middle Proterozoic
Lithologic constituents
Major
Metamorphic > Metasedimentary > Metaclastic > Slate
Metamorphic > Metasedimentary > Metaclastic > Phyllite
Metamorphic > Metasedimentary > Metaclastic > Quartzite
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 - Ouray - San Juan