Hartville Formation

Red and white sandstone underlain by gray dolomite and limestone, red shale, and red and gray sandstone. Lowermost unit may be Late Mississippian in age.
State Wyoming
Name Hartville Formation
Geologic age Lower Pennsylvanian-Permian
Lithologic constituents
Major
Sedimentary > Clastic > Sandstone
Minor
Sedimentary > Clastic > Mudstone > Shale
Sedimentary > Carbonate > Dolostone
Sedimentary > Carbonate > Limestone
References
NGMDB product
Counties Converse - Goshen - Niobrara - Platte