河南汝阳地区一巨型蜥脚类恐龙股骨化石的发现及其地层学意义

报道了首次在河南省汝阳县发现的大型蜥脚类恐龙股骨化石。从股骨近端的大小来判断,该股骨的实际长度可能超过2m,应属于巨型蜥脚类恐龙的股骨无疑。虽然化石破碎,种属的归属存在一定的困难,但是它的发现无论从晰脚类恐龙的分布、演化还是从地层学上都具有重要意义。该恐龙股骨化石的发现,将该地区原认为属于古近系蟒川组的时代向前推至早白垩世晚期或晚白垩世早期,同时其下伏地层陈宅沟组也应划归白垩纪时期的沉积。

A New Gigantic Sauropod Dinosaur with the Deepest Known Body Cavity from the Cretaceous of Asia

A new species of sauropod dinosaur Huanghetitan ruyangensis is erected based on the following characters： deepest body cavity with a dorsal rib reaching at least 2.93 m long, anterior caudal vertebrae with mushroom-shaped neural spines. Based on this new specimen of Huanghetitan found in the early Late Cretaceous Mangchuan Formation of Ruyang, Henan Province, the family Huanghetitanidae faro. nov. is proposed as a new rank to include only the genus Huanghetitan You et al. 2006. At present, Huanghetitan includes two species： H. liujiaxiaensis You et al., 2006 and H. ruyangensis sp. nov. The systematic relationships of Huanghetitan among sauropod dinosaurs are briefly discussed.

河南汝阳含巨型蜥脚类恐龙动物群地层时代的孢粉学证据

河南汝阳等地区大量微体古生物样品分析,首次在原“蟒川组”发现大量保存完好的孢粉化石。通过对化石组合特征进行记述和对重要化石地质时代进行讨论,结果表明,该孢粉类群及其含量变化的组合特征与松辽盆地登楼库组、河南周口商水组孢粉化石特征相似,确定其时代为早白垩世Aptain期。孢粉学研究丰富了汝阳地区的地层古生物内容,为厘定赋存巨型蜥脚类恐龙动物群的地层时代提供了孢粉学证据。