Sauropsida
Diapsida
Archosauria
Dinosauria
Ornithischia
Neornithischia
Marginocephalia
Ceratopsia (Horned Dinosaurs)
Ceratopsidae
Chasmosaurinae
Upper Maastrichtian, Late Cretaceous
Hell Creek Formation
United States (Montana, North Dakota, South Dakota, and Wyoming)
Length: 7.9 – 9.0 m
Everyone’s favorite walking billboard was a lot spikier and hornier (in every sense of the word) than you might remember him to be.
Thursday, August 13th, 2015
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