Greenhorn Formation and Belle Fourche Shale

Greenhorn Formation - Light-colored limestone, marl, and limy sandstone interbedded with gray concretionary shale. Belle Fourche Shale - Black soft bentonitic concretionary shale. Carlile Shale (Kcl) - Dark-gray sandy shale; Sage Breaks Member at top; Turner Sandy Member in middle.
State Wyoming
Name Greenhorn Formation and Belle Fourche Shale
Geologic age Upper Cretaceous
Lithologic constituents
Major
Unconsolidated > Marl
Sedimentary > Clastic > Sandstone
Sedimentary > Carbonate > Limestone
Minor
Sedimentary > Clastic > Mudstone > Shale
Incidental
Sedimentary > Clastic > Mudstone > Claystone > Bentonite
References
NGMDB product
Counties Niobrara - Weston