Undescribed tyrannosaurid
Late Cretaceous
Aguja Formation
Bruester City, Texas, USA

Beautiful 30mm (1.2 inches) tooth. The tyrannosaurs of the Aguja Formation are only just now being studied so at the moment this species is unnamed. This is probably the best tooth we have ever had from the Aguja.

See: Lehman, T. M., & Wick, S. L. (2012). Tyrannosauroid dinosaurs from the Aguja Formation (Upper Cretaceous) of Big Bend National Park, Texas. Earth and Environmental Science Transactions of the Royal Society of Edinburgh, 103(3-4), 471-485.

Wikipedia on the Aguja (opens in new tab): Wikipedia – The Aguja Formation and its fauna