This is a 1 1/2" Nanotyrannus Tooth from the Hell Creek Formation in Garfield County, Montana. The Nanotyrannus is a smaller species of one of the largest carnivores. Some believe they are actually juvenile T Rex. Others claim they are there very own species. Either way, this is a very nice tooth!
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Length - 1 1/2"
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Width - 5/8"