STYGIMÖLÖCH
Stygimoloch (meaning “horned devil from the Styx (river of death)”) is a putative genus of pachycephalosaurid dinosaur from the end of the Cretaceous period, roughly 65 million years ago. It is currently known from the Hell Creek Formation, Ferris Formation, and Lance Formation of the Western Interior (United States), where it lived alongside Tyrannosaurus and Triceratops. It may represent a sub-adult form of Pachycephalosaurus.
Via XKCD.
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