华北地台石炭系—二叠系界线的腕足动物标志

依据现代地层学理论,年代地层界线应具有全球一致性或近一致性。根据华北地台石炭纪、二叠纪地层特点,笔者主张在华北地台以Pseudoschwagerina(s.s)带(确切地说是最早出现该带特征化石层位)底作为二叠纪的开始。本文通过对华北地台若干典型地点界线附近的腕足动物化石进行系统研究,认为腕足动物面貌在界线附近有清晰的变化,与界线标志(竹蜓)属有一定的对应关系,以此作为界线的辅助标志具有区域性的普遍意义。

The Brachiopod Indicator on the Permo-Carboniferous Boundary in the North China Platform

In light of the modern stratigraphic theory, the choronostratigraphic boundaries should be consistent or nearly consistent globally. According to this view coupled with the features of the Carboniferous and Permian in the North China platform, the author holds that the boundary between the Carboniferous and Permian be drawn at the base of the Fusulinida Pseudoschwagerina (s.s) Zone (i. e. the horizon of the first appearance of the diagnostic fossil in the zone) in the North China Platform. Furthermore, the author has systematically studied brachiopods collected from near the boundary of eight typical localities and considers that brachiopod features near the boundary show distinct change and have certain corresponding relationship with the boundary in-dication-fusulinids. The author thinks that taking brachiopods as a supplementary indication of the boundary is feasible and of regional significance.