鄂东南地区的保安组

BAOAN FORMATION WITHIN SOUTHEASTERN HUBEI PROVINCE

本文按现代地层学的理论,分析和对比了鄂东南地区早三叠世大冶群之下的一套硅质岩或以硅质岩为主体的地层,并将这套地层视作同一地层单位,统一称为保安组,其时代为晚二叠世晚期。同时还认为:Anderssonoceras动物群在地史上存在“异时出现”现象,这一动物群在鄂东南等地的层位,时代属晚二叠世晚期。

According to modern stratigraphy theories, this article comprehen-sively analyzes and correlates a suite of siliceous rocks or strata with bulk of siliceous rocks beneath the Daye Group of Early Triassic Epoch within southeastern Hubei Province. The suite of strata is considered the same stratigraphy unit, named Baoan Formation unitarily and dated back to the later age of Late Permian Epoch. The author holds that in geologic-al history there might have been a phenomenon of“Asynchronous occur-rence”of Anderssonoceras fauna whose horizon and age in southeastern Hubei Province belongs to the later age of Late Permian Epoch.