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Tenontosaurus BW c5e3.jpg

Tenontosaurus (te-NON-to-SAWR-əs; meaning "sinew lizard") is a genus of medium- to large-sized ornithopoddinosaur. The genus is known from the late Aptian to Albian ages of the middle Cretaceous period sediments of western North America, dating between 115 and 108 million years ago.

The genus contains two species, Tenontosaurus tilletti (described by John Ostrom in 1970[1]) and Tenontosaurus dossi (described by Winkler, Murray, and Jacobs in 1997). Many specimens of T. tilletti have been collected from several geological formations throughout western North America. T. dossi is known from only a handful of specimens collected from the Twin Mountains Formation of Parker County, Texas.

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