Stegosaurs are a major clade of ornithischian dinosaurs, yet because their fragmentary fossil record, interrelationships and early evolution poorly understood. Here, we describe new stegosaur, Bashanosaurus primitivus, gen. et sp. nov., some other indeterminate stegosaur materials. We provide U-Pb detrital zircon ages for horizons bounding the holotypic quarry in Lower Member Shaximiao Formatio...
