Denver and Arapahoe Fms

Sandstone, mudstone, claystone, and conglomerate; Denver is characterized by andesitic materials
State Colorado
Name Denver and Arapahoe Fms
Geologic age Tertiary-Cretaceous
Lithologic constituents
Major
Sedimentary > Clastic > Mudstone
Sedimentary > Clastic > Sandstone
Sedimentary > Clastic > Conglomerate
Minor
Igneous > Volcanic > Mafic-volcanic > Andesite
Sedimentary > Clastic > Mudstone > Claystone
References

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

NGMDB product
Counties Adams - Arapahoe - Boulder - Broomfield - Denver - Jefferson - Weld