滇东路南地区晚泥盆世晚期地层对比

STRATIGRAPHIC CORRELATION OF LATE UPPER DEVONIAN IN LUNAN AREA,EASTERN YUNNAN

滇东地区上泥盆统上部地层,虽有不少单位和个人先后做过工作,但属法门阶还是弗拉斯阶的问题,由于缺乏特征性化石依据,致使认识得不到统一。近两年来,笔者参加我校1:5万路南幅的地质填图,在上泥盆统上部的“寨黑组”内,找到许多可与华南地区锡矿山阶对比的腕足类化石,发现了在国内尚属首次发现的法门期世界性特征分子——Plectorhynchella腕足动物群,以及大量的牙形石,肯定了滇东地层分区存在法门阶地层。

Although many units and persons have surveyed early or late, the owner-ship of the upper strata of Upper Devonian (Famennian or Frasnian) hasnot reached agreement yet because of lack of evidence of the characteristic fossils. In recent two years, the authors have participated in the geological mapping of the Lunan sheet on a scale of 1: 50000 organized by our school and found many brachiopodous fossils which can compare with the Xikuang-shan stage in south China, particularly the Plectorhyncklla fauna—a world-wide Famennian characteristic member which is found for the first time in China, and a large amount of conodonts in the Zhaihei Formation of the up-per part of Upper Devonian, thus proving the existence of the Famennian stratigraphy in the eastern Yunnan subregion.