Willwood Formation

Variegated claystone, shale, and sandstone; some lenticular gold-bearing quartzite conglomerate.
State Wyoming
Name Willwood Formation
Geologic age Eocene
Lithologic constituents
Major
Sedimentary > Clastic > Mudstone > Shale
Sedimentary > Clastic > Sandstone
Sedimentary > Clastic > Mudstone > Claystone
Minor
Sedimentary > Clastic > Conglomerate
References
NGMDB product
Counties Big Horn - Hot Springs - Park - Washakie