Theropod dinosaur (vertebra cast)
Tyrannosaurus rex
Lived 68-66 million years ago
Hell Creek Formation, McCone Co., Montana
USNM 555000
Courtesy U.S. Army Corps of Engineers, Omaha District and The Museum of the Rockies, Montana State University

and

Ceratopsian dinosaur (composite cast)
Triceratops horridus
Lived 68-66 million years ago
Lance Formation, Niobrara Co., Wyoming
USNM 2100, USNM 4842, and others

Anterior view of Tyrannosaurus rex biting the skull of Triceratops horridus.

In 1988, rancher Kathy Wankel discovered this Tyrannosaurus specimen while hiking on land managed by the U.S. Army Corps of Engineers. After a little digging with a garden shovel and a jackknife, she unearthed the first complete T. rex arm ever found. Dr. Jack Horner of the Museum of the Rockies led the mission to excavate the rest. This specimen was loaned to the Smithsonian in 2014 for 50 years, where it is to be displayed with the composite cast of a Triceratops horridus, assembled from the remains of several individual specimens.

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