Sedimentary rocks (Paleocene and Cretaceous).

Fluvial conglomerate and sandstone of the Beaverhead Formation northwest of Dubois. (Paleocene to Neoproterozoic Sedimentary and Igneous Rocks of the Cordilleran System).
State Idaho
Name Sedimentary rocks (Paleocene and Cretaceous).
Geologic age Paleocene and Cretaceous
Lithologic constituents
Major
Sedimentary > Clastic > Sandstone (Bed)Fluvial conglomerate and sandstone.
Sedimentary > Clastic > Conglomerate (Bed)Fluvial conglomerate and sandstone.
References

Lewis, Reed S., Link, Paul K., Stanford, Loudon R., and Long, Sean P., Geologic Map of Idaho, 2012, Idaho Geological Survey, Geologic Map 9 (M-9); Scale 1:500,000.

NGMDB product
Counties Clark