Niobrara Fm

Calcareous shale and limestone
State Colorado
Name Niobrara Fm
Geologic age Cretaceous
Lithologic constituents
Major
Sedimentary > Clastic > Mudstone > Shale (Calcareous)
Minor
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 Baca - Bent - Cheyenne - Crowley - Custer - El Paso - Fremont - Huerfano - Kiowa - Las Animas - Otero - Prowers - Pueblo