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安徽长江流域二叠系分布广泛,发育完整,地表出露良好,含有多门类古生物化石,历来是研究我国华南二叠系的重要地区之一。前人曾对其做过大量的工作,取得了不少地质成果。但是,对于早二叠世孤峰组硅质岩之上、晚二叠世龙潭组下部长石石英砂岩段之下,一套以页岩为主的地层——即所谓“不含煤段”或“A煤组”(以下简称砂页岩段),由于缺少生物地层资料,造成划分上的不统一、时代归属问题上的意见分岐。另外,在与繁昌、宿松等地孤峰组之上所谓“茅口灰岩”(胡海涛1951)或“新林段”(何炎等1964)
The Permian in the Yangtze River Basin of Anhui Province is widely distributed and well-developed. Its surface shows well and contains many types of paleontological fossils. It has always been one of the most important areas for studying the Permian in South China. The predecessors have done a great deal of work on it and have achieved many geological achievements. However, for the Early Permian Jufeng Formation chert, above the Late Permian Longtan Formation feldspar quartz sandstone, a set of shale-dominated strata - the so-called “non-coal-bearing segment” Or “coal group A” (hereinafter referred to as sand shale), due to the lack of biostratigraphic data, resulting in the division of the non-uniform, attribution of the views of the times divergence. In addition, the so-called “Maokou Limestone” (Hu Haitao 1951) or “Xinlin Section” (He Yan et al. 1964)