 The expedition was led by John Ostrom, whose team discovered more than 40 new specimens.Following his expedition, Ostrom became the first to describe and name the animal, calling it "Tenontosaurus", a slight variation in spelling of Brown's informal name.Since 1970, many more "Tenontosaurus" specimens have been reported, both from the Cloverly and other geological formations, including the Antlers Formation in Oklahoma, Paluxy Formation of Texas, Wayan Formation of Idaho, Cedar Mountain Formation of Utah, and Arundel Formation of Maryland.