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First discovery of a theropod (Dinosauria) from the Upper Jurassic in Mongolia and its stratigraphy
A theropod dinosaur is described for the first time from the Upper Jurassic of Mongolia. It is represented by a partial skull from the upper Jurassic Dariv Suite in Dariv, Ikhes Nuur Basin, Gobi-Altai Aimag, western Mongolia, situated relatively close to the Xinjiang Uygur Autonomous Province in the western part of China. From the same beds of the locality, sauropod bones were also abundantly found. Those fossil discoveries suggest that both carnivorous and herbivorous dinosaurs existed in the Jurassic of Mongolia, as in China.
Left side of theropod specimen. A. Lateral view. 2–8, Right maxillary teeth (7 and 8, teeth replacing 3 and 4, respectively); 9–15, dentary teeth. B. Oblique anterior view of left side. Scale is 5 cm.