Abstract:New revealed and previously reported dinosaur tracks, which are all from Middle-Upper Jurassic Santai Formation of the Mengyin basin in Yangzhuang, Xintai City, Shandong Province, are synthetically studied herein. These tracks are all tridactyl, longer than wide (ranges 12.0~17.5 cm in length and 9.5~12.4 cm in width) , and the track length/width ratios range between 1.3 and 1.4. One of the track(LR-XT10.1) even shows clear sharp claw traces. All these features demonstrate that these traces are of theropod, instead of ornithopod as previously interpreted, dinosaur affinity, and they are herein tentatively labeled as Grallator isp.The tracks from the Santai Formation are the earliest dinosaur record ever reported in Shandong Province, it also indicate that small-scale theropod dinosaurs once existed in the Megnyin basin during Middle-Late Jurassic time.
