A fault subsidence event was happened in southeast China during the middle period in early Cretaceous,while an event stratiqraphic unit-fault subsidence suite was formed.The genetic mechanism,features and types of the fault subsidence suite are depicted in the text,and the principles of the isochroneity of the event stratiqraphic unit were used to prove the horizon of Tangshang Formation in its type section located at Shuinan of Tiantai basin should be the same with that of Gantou Formation of the lower part of Yongkang Group,but not a new tectonic subbed which was overburdened upon Yongkang Group,and the so called.The second member of Dashuang Formation located near Sanjie of Shengzhou should also be Guantou Formation.The information obtained from the above mentioned fault subsidence suites suggested and concluded that the horizon and age of the fault subsidence suite based on the principle of even stratigraphy were correct.

Some problems of Cretaceous strata in southeastern China especialy the key horizones which are still in controversy were studied based on comprehensive stratigraphy including basin analysis, tectono-sedimentology, event stratigraphy and sequence stratigraphy, and some new understandings were put forward through synthetic analysis and judge on their genetic mechanism. It is recognized that the formation and evolution of basins, tectono-sedimentary cycles, sedimentary facies sequences and stratigraphic sequences, geological events are mainly controlled by the same episodic tectonic movement, so all of them are the geological records resulting from the same cause and expressed in different styles. There are close genetic connections and corresponding relationships among them and can be examed and complemented by each other, thus deepening relevant studies. New ideas about the following problems were proposed: the age of Tangshang the existence of Lishui Movement,the horizonal relationship between Yongkang Group and Tiantai Group, as well as a-mong the molassoid formations such as Fangyan Formation, Zhongdai Formation and Chichengshan Formation. Eventually, a regional correlation scheme of Cretaceous strata in southeasthern China was suggested.

甘肃北山泛指河西走廊以北、弱水以西的广大地区,近年其东部额济纳旗已划归内蒙古管辖。70年代中叶,甘肃地质力学测量队在该区进行区调过程中,采集了大量志留一泥盆纪的床板珊瑚,数量甚多。该区为一片戈壁残山,地层零星出露,其地质时代只能靠化石组合特征来判断。经鉴定,床板珊瑚有几个组合,面貌截然不同,组合的地质时代又比较肯定,因而这些化石材料的研究结果,对于进一步认识该区区域地层和在生物地理区系,均有所帮助。本文重点介绍各时代生物组合的特征,并在此基础上,结合与邻区同期生物群特征的对