Abstract:

According to the stratigraphic paleontological characteristics,the Tugulu,Kizilsu,Ka-pushaliang,Miaogou,Hekou,Xingmingbao,Donghe Groups and Chijingqiao,Wuerta,Dashuigou Formations,the lower part of the Quanyagou Group and their correspounding stratums are classified to Lower Cretaceous;the Ailikehu,Donggou,Bashijiqik,Kumutag,Subashi,Wulanshaohu,Minghe Formations and the Jinggangquan,Maliangou,the upper Quanyagou Groups and their equivelent stratums are classified to the Upper Creta-ceous.The boundary between the Jurassic and the Cretaceous is suggested to be set be-tween Kalazha Formation and Tugulu Group,Hongshan Formation and Tugulu Group,Shazaohe Group and Miaogou Group,Kushuixia Formation and Hekou Group,Hong-shuigou Group and Quanyagou Group,Wanxiu Group and Donghe Group.