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广州加禾一带二叠系十分发育,且为主要含煤地层之一,其中含大羽羊齿植物群的一套碎屑岩沉积,历年来被称为“龙潭煤系”,以往均归于晚二叠世早期。该地层根据其岩性特征,又常被划分为四个岩性组合段(表1),就岩性而言,这四个岩性组合段的层序十分清楚,层位稳定,不仅分布于广州、花县及高要一带,而且广布于阳春、台山、恩平及开平等地。这套地层的时代划分和对比,不仅直接关系到该区上、下二叠统的界线,而且牵涉到煤田地质的普查与勘探,因此有必要加以讨论。
The Permian in Jiahe area of Guangzhou is well developed and is one of the major coal-bearing strata. Among them, a set of clastic sediments containing a large feather fern flora has been known as the “Longtan Coal Series” over the years, Early Epoch. According to its lithological characteristics, the strata are often divided into four lithologic assemblages (Table 1). In terms of lithology, the sequences of these four lithologic assemblages are well-defined and the layers are stable. They are not only distributed in the Guangzhou, Huaxian and Gaoyao areas, and widely distributed in the spring, Taishan, Enping and Kaiping and other places. The stratigraphic division and contrast of the strata not only have a direct bearing on the boundary between the upper and lower Permian of the area, but also involve the census and exploration of coalfield geology. Therefore, it is necessary to discuss it.