Edmontosaurus ungual toe bone, record size Troodon The egg is somewhat flattened

The egg is somewhat flattened

It was a massive dinosaur measuring up to 50 feet in length and weighing between 10-15 tons

A single fossil (together with some skin impressions) was found in Madygen

in the middle Morrison Formation of Colorado in 1972

Comparisons with other eugenodontids suggest that Helicoprion may have grown up to 10-15 ft long

Edmontosaurus ungual toe bone, record size Troodon The egg is somewhat flattenedThis 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