Fort Union Formation
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The Fort Union Formation is a geologic unit containing sandstones, shales, and coal beds in Wyoming, Montana, and parts of adjacent states. In the Powder River Basin, it contains important economic de
Browniea serrata from the Fort Union Formation
Carpodaptes aulacodon
Plesiadapis sp. MUSE
Plesiadapis NT
Wasatch Formation
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The Wasatch Formation is an extensive highly fossiliferous geologic formation stretching across several basins in Idaho, Montana, Wyoming, Utah and western Colorado. It preserves fossils dating back t
Clinker-bed breccia from the Wasatch Formation (Wyoming)
View of Fossil Butte with the Wasatch Formation outcropping in the lower areas