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Carcharodontosaur (Siamraptor?) Tooth, Early Cretaceous

0.5" (1.3 cm) Carcharodontosaur (Siamraptor?) tooth from the Grès supérieurs Formation of Laos.  This Carnosaur lived between 125-113 million years ago. This is an exceptionally rare dinosaur tooth. The presevation from this formation is poor, and partial teeth are the most that one can expect.