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Lance Formation

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(North Wyoming) - Thick-bedded buff sandstone and drab to green shale; thin conglomerate lenses. (South and Northeast Wyoming) - Brown and gray sandstone and shale; thin coal and carbonaceous shale beds.
State Wyoming
Name Lance Formation
Geologic age Upper Cretaceous
Lithologic constituents
Major
Sedimentary > Clastic > Mudstone > Shale (Carbonaceous)
Sedimentary > Clastic > Sandstone
Minor
Sedimentary > Clastic > Conglomerate
Sedimentary > Coal
References

Love, J.D. and Christiansen, A.C., 1985, Geologic Map of Wyoming: U.S. Geological Survey, scale 1:500,000.

https://pubs.er.usgs.gov/publication/70046739
NGMDB product
Counties Big Horn - Campbell - Carbon - Converse - Crook - Fremont - Goshen - Hot Springs - Johnson - Natrona - Niobrara - Park - Sheridan - Sweetwater - Washakie - Weston