滇中川街叶肢介Chuanjieestheria化石在冀北后城组的发现及其地质意义

摘要

滇中含中体罗世海相化石地层之上连续沉积的麻地山组、安宁组和妥店组,时代应为晚侏罗世,产川街叶肢介、似东方叶肢介、云南雕饰叶肢介等化石,具有美丽的“滨生长线瘤”构造,形成特提斯区特有的叶肢介动物群.在冀北宣化堰家沟后城组首次发现特提斯区极为发育的川街叶肢介化石,进一步证明后城组完全可以与滇中地区上侏罗统麻地山组-安宁组-妥店组对比,后城组的时代应为晚侏罗世,可能更近于晚侏罗世早—中期.川街叶肢介化石在后城组的发现,为环太平洋带的纯陆相后城组与特提斯区由海相化石推定的上侏罗统对比提供了古生物化石的有力佐证,具有重要的地层对比意义.%The conchostracan fossils,such as Chuanjieestheria Niu,Eosestheriopsis Shen et Chen,and Yunnanograpta Niu were oringinally collected from Upper Jurassic Madishan Formation,Anning Formation and Tuodian Formation in central Yunnan Province.After that,these fossils were found from Upper Jurassic Shuining Formation and Penglaizhen Formation in Sichuan Basin.In 1980,genus Chuanjieestheria Niu was found in Yanjiagou Village,Xuanhua City,Hebei Province by the authors.The discovery of this genus is of important significance in the stratigraphic division and correlation.