摘要
根据年代地层界线应该是反映地球历史发展阶段性的自然界线这一原理,本文在古特提斯区完整的海相地史记录的基础上,以其时的首要标准生物类群——(虫筵)类的发展阶段为统一标志,提出了一个建议的二叠系国际统一年代地层系统。它自下而上包括:下二叠统卡西莫夫阶、格热尔阶、阿舍里阶,萨克马尔阶和湘中阶;中二叠统栖霞阶和另外三个待命名的阶;上二叠统三阳阶和长兴阶。
According to the principle that the chronostratigraphic boundary oughtto be a natural boundary reflecting a development stage of the earth,an in-ternational chronostratigraphic system of the Permian has been advanced inthis paper with the complete marine strata of the Permian in PaleotethysRealm as basis and with the development stage of fusulinid,which is thefirst leading fossil group in the Permian,as united indication.In this sys-tem,the Permian is composed of 11 stages of three series,namely(inascending order):the Kasimovian stage(newly defined),the Gzhelianstage(newly defined),the Asselian stage,the Sakmarian stage and theXiangzhongian stage of Lower Permian series;the Qixian stage and otherthree stages which remain to be named in future of Middle Permianseries;the Sanyangian stage and the Changxingian stage of Upper Per-mian series.
出处
《石油与天然气地质》
EI
CAS
CSCD
北大核心
1989年第1期1-8,共8页
Oil & Gas Geology
