闽西老虎洞组下部类生物地层的再研究

Re-analysis of Fusulinids Biostrata from the Lower Part of Late Carboniferous Laohudong Formation in Western Fujian

基于闽西上杭和宁化两地石炭系老虎洞组下部带的系统研究 ,通过类生物地层划分和对比及岩相古地理的分析 ,认为上杭—宁化一线类生物地层存在着横向变化 ,上杭Profusulinella带与宁化 Pseudoendothyra ninghuaensis带应为同期异相的化石带。与之相关的老虎洞组底部的白云岩层年代地层应分别归属于滑石板阶上部及达拉阶下部。

Based on systematic study of the Fusulinids belt in the lower part of Late Carboniferous Laohudong Formation in Shanghang County and Ninghua County, the Fusulinids biostrata and lithofacies paleogeography in the surveyed area make under a division and correlation in the paper.It is inferred that there exists in horizontal variation of Fusulinids biostrata in Shanghang County and Ninghua County and that the Profusulinella zone in Shanghang County and Pseudoendothyra ninghuaensis zone in Ninghua County belong to the fossil zone of contemporaneous and different facies.However, the stratigraphic time of the dolomite layer in the bottom of Laohudong Formation should class under the upper part of the Huashiban Stage(early age of Middle Carboniferous) and the lower part of Dala Stage (late age of Middle Carboniferous) in Guizhou Province.