中国四川盆地南缘白垩纪中期的非鸟兽脚类行迹(英文)

MID-CRETACEOUS NON-AVIAN THEROPOD TRACKWAYS FROM THE SOUTHERN MARGIN OF THE SICHUAN BASIN,CHINA

描述中国贵州赤水地区白垩纪中期窝头山组(夹关组)宝源足迹点的七道非鸟兽脚类行迹。尽管统计的样本不甚充足,但足迹所在岩层的孢粉初步分析结果表明其时代可新至晚白垩世(最晚可晚于Cenomanian阶)。这批足迹被归入似和平河足迹未定种(cf.Irenesauripusisp.),大多数足迹的跖趾垫区域保存了不同大小的跖骨垫。一些延长的趾痕则可能暗示着其造迹者的第二趾拥有一个超过其它趾的长爪。足迹化石显示窝头山组(夹关组)所含动物群缺乏蜥脚类,而以兽脚类和鸟脚类为主。

Here we describe seven non-avian theropod trackways from the Baoyuan track site in the mid-Creta-ceous Wotoushan Formation（Jiaguan Formation） in the Chishui area,Guizhou Province,China.Preliminary palyno-logical analysis indicates Late Cretaceous age not earlier than Cenomanian at the oldest.Footprints at the site pertain to cf.Irenesauripusisp.Most tracks preserve partial metatarsal pads that are not distinct from their respective meta-tarsophalangeal regions.Several elongate digit impressions may indicate that digit II of the track maker possessed a long claw,longer than on any of the other digits.Most notably,the Wotoushan（Jiaguan） fauna lacks sauropods andis dominated instead by theropods and ornithopods.