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下扬子区系指九江以东长江两岸呈北东向展布的喇叭状地区,包括安徽的中南部、江苏的大部分以及浙江北部(图1)。本区中、下三迭统分布广泛,发育良好,化石比较丰富,并赋存多种重要矿产。1965年以来,笔者先后参加测制苏皖地区一些中、下三迭统剖面,还对有些剖面作了实地观察,搜集和积累了一些地层及古生物资料。对本区中、下三迭统的分界有一些粗浅的认识,草成此文,供同志们参考。
The Lower Yangtze region refers to the trumpet flared to the north-east of both banks of the Yangtze River east of Jiujiang, including central and southern Anhui, most of Jiangsu and northern Zhejiang (Figure 1). In the area, the next three Diego widely distributed, well-developed, relatively rich fossils, and the occurrence of a variety of important minerals. Since 1965, the author has taken part in the preparation of some Middle and Lower Triassic sections in the Jiangsu-Anhui area. Some sections have also been observed on the spot, and some stratigraphic and paleontological data have been collected and accumulated. There are some superficial understandings of the boundaries of the Lower Tri-Tseng in this area and we have made this passage into consideration for comrades’ reference.