Wayan and Smiths Formations

Wayan Formation - Variegated mudstone, siltstone, and sandstone. Smiths Formation - Ferruginous black shale and tan to brown sandstone.
State Wyoming
Name Wayan and Smiths Formations
Geologic age Lower Cretaceous
Lithologic constituents
Major
Sedimentary > Clastic > Mudstone > Shale > Black-shale
Sedimentary > Clastic > Sandstone
Sedimentary > Clastic > Siltstone
Minor
Sedimentary > Clastic > Mudstone
References
NGMDB product
Counties Lincoln