Tyrannosaurus Rex Tooth #02 - Montana, Hell Creek Fm, T rex, Dinosaur Fossil. A large, worn Tyrannosaurus Rex tooth from the Hell Creek Formation - it likely snapped during feeding, was swallowed and worn down by stomach acid.The price reflects the wear to the tooth's enamel, but this is a still a chunky and impressive rex tooth and ought to be great value! Hell Creek Formation, Carter County, Montana. The item "Tyrannosaurus Rex Tooth #02 Montana, Hell Creek Fm, T rex, Dinosaur Fossil" is in sale since Tuesday, June 4, 2019. This item is in the category "Collectables\Rocks, Fossils & Minerals\Fossils\Dinosaurs & Reptiles". The seller is "dinofossilsuk" and is located in CF46 6AD. This item can be shipped to all countries in Europe, United States, Canada, Australia.