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Madison Limestone and Bighorn Dolomite

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Madison Limestone or Group - Group includes Mission Canyon Limestone (blue-gray massive limestone and dolomite), underlain by Lodgepole Limestone (gray cherty limestone and dolomite). Bighorn Dolomite - Light-gray massive siliceous dolomite.
State Wyoming
Name Madison Limestone and Bighorn Dolomite
Geologic age Middle Ordovician-Upper Mississippian
Lithologic constituents
Major
Sedimentary > Carbonate > Limestone
Minor
Sedimentary > Carbonate > Dolostone
Comments COMU box only shows Upper and Middle Silurian to Lower Devonian. Arrows extend age down through, up into Upper Mississippian
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 Johnson - Washakie