Bighorn Dolomite

Light-gray massive siliceous dolomite in northern Yellowstone area. Gray massive cliff-forming siliceous dolomite and locally dolomitic limestone in Thrust belt and northern Wyoming.
State Wyoming
Name Bighorn Dolomite
Geologic age Middle Ordovician-Upper Ordovician
Lithologic constituents
Sedimentary > Carbonate > Dolostone
NGMDB product
Counties Big Horn - Johnson - Park - Sheridan