山东蒙阴盆地中晚侏罗世三台组恐龙足迹化石新材料新认识

对山东蒙阴盆地三台组以前及新发现的三趾型恐龙足迹化石开展了综合研究，认为应归入翘脚龙足迹属Grallator，其造迹者是小型兽脚类恐龙而非此前认为的鸟脚类恐龙，是目前山东省时代最老的恐龙足迹化石，也是中晚侏罗世恐龙活动的唯一证据。

Dinosaur tracks from Middle-Upper Jurassic Santai Formation:New materials and new interpretation

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.