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Newcastle Sandstone and Skull Creek Shale

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Newcastle Sandstone - Gray sandstone and sandy shale containing some bentonite and coal. Skull Creek Shale - Black soft fissile shale.
State Wyoming
Name Newcastle Sandstone and Skull Creek Shale
Geologic age Lower Cretaceous
Lithologic constituents
Major
Sedimentary > Clastic > Mudstone > Shale
Sedimentary > Clastic > Sandstone
Minor
Sedimentary > Clastic > Mudstone > Claystone > Bentonite
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 Crook - Niobrara - Weston