Sedimentary rocks of the Late Cretaceous Mesaverde Group

Gray to buff sandstone with interbedded shale and coal. These rocks, which are similar to slightly younger rocks that form Mesa Verde in southwestern Colorado, were deposited on the margin of a shallow sea. Rocks of this map unit host the only large coal deposits in Arizona. (84-88 Ma)
State Arizona
Name Sedimentary rocks of the Late Cretaceous Mesaverde Group
Geologic age Late Cretaceous
Lithologic constituents
Major
Sedimentary > Coal (Bed)
Sedimentary > Clastic > Sandstone (Bed)
Sedimentary > Clastic > Mudstone > Shale (Bed)
Stratigraphic units Mesaverde Group
References

Richard, S.M., Reynolds, S.J., Spencer, J.E., and Pearthree, P.A., 2000, Geologic Map of Arizona: Arizona Geological Survey Map 35, 1 sheet, scale 1:1,000,000.

Nations, J.D., 1989, Cretaceous history of northeastern and east-central Arizona, in Jenney, J.P., and Reynolds, S.J., editors, Geologic evolution of Arizona: Arizona Geological Society Digest 17, p. 435-446.

NGMDB product
Counties Apache - Coconino - Navajo