Edmontosaurus annectens was a hadrosaur (duckbilled dinosaur) that ranged from northern Alaska to present day New Mexico more than 65 MYA. Contemporaries of Tyrannosaurus rex and Triceratops horridus, they traveled in herds following the seasons along the coast of the inland sea which connected the Gulf of Mexico to the Arctic Ocean.
Black Hills Institute collected for more than a decade from the Ruth Mason Quarry (RM), a large bonebed containing the remains of literally thousands of Edmontosaurus annectens skeletons. This herd of herbivores suffered a catastrophic event, which killed thousands of individuals. The presence of bones, obviously fed upon by predators after death, and the many broken Nanotyrannus and T. rex teeth found at the site, suggest these carcasses lay unburied for a time. Eventually nearly complete skeletal disarticulation eventually took place. However, bone preservation at the site indicates that burial occurred before the individual bones had a chance to weather (probably within a few weeks of death). Composite fossil bone skeletons have been prepared and mounted for museums in Europe, Japan and the United States from this bonebed. More than 350 bones comprise a complete Edmontosaurus annectens skeleton.
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