National Register of Historic Places

Como Bluff

Near Rock River

Date Added to Register

Thursday, January 18, 1973

Smithsonian Number


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Como Bluff is a long ridge extending on an east-west axis approximately six miles between the small towns of Rock River and Medicine Bow, Wyoming. The ridge is an anticline, the result of folding geologic pressures. Two geological formations, the Sundance and the Morrison, relating to the Mesozoic Era are exposed. Here paleontologists of the nineteenth century discovered and unearthed, from Morrison formation strata, many perfect fossil specimens of large land dwelling creatures. It is thought that Como Bluff was the site of the first major discovery of dinosaur remains in the world. Significant discoveries were made in fourteen different quarries scattered along the entire length of the ridge.

Department of State Parks & Cultural Resources