This is the ungual phalanx (toe) of an Edmontosaurus found in the Hell Creek Formation of Harding County, South Dakota. Cretaceous Age. The ungula is the last digit of the hand or foot and is the bone under the nail. This specimen is the largest we have been able to measure and thus may be a record size.
Edmontosaurus was a large bipedal plant-eater very common in North America during the late Cretaceous. It is one of the best-known “duckbilled dinosaurs” (hadrosaurs) characterized by a particular denture formed by batteries of hundreds of small lozenge-teeth like this you which it used for pulverizing its tough plant foods. Edmontosaurus was up to 39 feet long and 16 feet tall.
Looking at the last photo can you tell which is the original, authentic, ungual? It is the one on the right.
5 x 4 inches
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