Aspen Shale

Light- to dark-gray siliceous tuffaceous shale and siltstone, thin bentonite beds, and quartzitic sandstone.
State Wyoming
Name Aspen Shale
Geologic age Lower Cretaceous
Lithologic constituents
Major
Sedimentary > Clastic > Siltstone
Sedimentary > Clastic > Mudstone > Shale
Minor
Sedimentary > Clastic > Sandstone
Sedimentary > Clastic > Mudstone > Claystone > Bentonite
Incidental
Igneous > Volcanic (Pyroclastic-tuff)
References
NGMDB product
Counties Lincoln - Sublette - Teton - Uinta