摘要: 国际地层委员会"侏罗-白垩系界线工作组"自从新任主席 J. Remane 教授1979年7月在巴黎召开的第26届国际地质大会上被提名接替已退休的前主席 R. Casey 博士的工作以来,首先完成了工作组的改组和扩建工作,接着在慕尼黑、莫斯科和匈牙利召开了3次工作组和国际学术会议,取得了一定成绩,但是关于北方区(冷水区)与特提斯区(暖水区)的化石分带对比工作至今尚未完成和统一,因为它们属于不同的生物地理区系,北方区侏罗-白垩系界线
Southeast Jilin includes Tonghua, Hunjiang, Liuhe, Jiaohe, etc, with the Sankeyushu section in the Sanyuanpu Basin taken as the type locality and the sequence described as follows: K2 Sankeyushu Formation: neutral volcanic rock
摘要: In Precambrian, stromatolites, especially columnar stromatolites, underwent a marked evolutionary process from beginning of development through extensive flourish to rapid decline. The present paper makes a discussion on the exact data and cause of the stromatolitic decline in an attempt to reveal the evolution of biosphere and change of ecological environments in the terminal Precambrian according to a study of the stromatolitic decline event.
摘要: The cephalopods described in the present paper were mainly collected from the Badou Formation in the Zhangqiu district of central Shandong and the Fengfeng Formation in the Fengfeng city of southern Hebei by the writer and his colleagues in 1982-1983. They consist of 3 genera and 11 species, including 1 new genus and 9 new species. This paper also discusses previous reports on the Gonioceras from China and the contrast of the Badou Formation with the Fengfeng Formation as well as ecology, migration, origin and evolution of gonioceratids.
