Fowkes Formation

Light-colored tuffaceous sandstone and siltstone, locally conglomeratic. Locally designated by some as Norwood Tuff.
State Wyoming
Name Fowkes Formation
Geologic age Eocene
Lithologic constituents
Major
Sedimentary > Clastic > Sandstone (Tuffaceous)
Sedimentary > Clastic > Siltstone (Tuffaceous)
Minor
Igneous > Volcanic (Pyroclastic-tuff)
Sedimentary > Clastic > Conglomerate (Tuffaceous)
Comments Upper part may be as young as Pliocene, according to COMU unit description. COMU box stops with a ? at Eocene/Oligocene boundary.
References
NGMDB product
Counties Lincoln - Uinta