This Specimen has been sold.
Bargain, 3.9" Theropod Caudal Vertebra - Hell Creek Formation
This is a 3.9", theropod, caudal vertebra centrum from the Hell Creek Formation. It is from one of the the larger genera (plural of genus), Tyrannosaur, Nanotyrannosaur or Struthiomimus are the most likely candidates. It is just the body (centrum) of the vertebra and has a number of repaired cracks.
Because of its age and sedimentary composition, the Hell Creek Formation has become one of the most paleontologically studied areas in the world. 158 genera of animals and 64 genera of plants are known from the formation and new discoveries are made frequently. In addition to Tyrannosaurs, Ceratopsids, and Hadrosaurs, the formation has yielded remains of amphibians, reptiles, lizards, snakes and turtles, fish and sharks, avian and non-avian dinosaurs, and mammals. The Hell Creek Formation gives the most complete understanding of the environment just before the Cretaceous-Paleogene extinction.