Specimen:  RMDRC "Survey" (cast)

Discovery:  Mike Triebold, 1995

Excavated:  Harding County, SD

Length:  24 ft

Height:  8 ft

Weight:  est. 2 tons

Skull:  2.5 ft

This young adult Edmontosaurus appears to have survived an attack! The fossil, field named “Survey”, was more than 75% complete, while the skull was nearly 100%, including all four sets of teeth batteries. On the right dentary (lower jaw) are deep gouges and shallower ones on the left. Close examination suggests the bite marks may have begun to heal. The original specimen is now at the Fukui Prefectoral Museum in Japan.

Some estimates put the largest adults at nearly 49 ft long, weighing 10 tons. Additionally, hadrosaurs (duck-billed dinosaurs like Edmontosaurus) had more teeth than any other known animal, numbering more than 1,200. Latest studies suggest hadrosaurs had highly efficient chewing, moving their lower jaws up and down with a forward and backward motion; they could not move their jaw side-to-side like a cow. 

While some 60 hadrosaur fossils were found with this Edmontosaurus at the Sandy Site in Harding County, SD, over 13,000 Edmontosaurus fossils have been found 200 miles south in the Hanson Ranch dig site of Niobrara County, WY! Multiple studies have shown the thousands of fossils at both sites were buried by a catastrophic deposition.