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本文根据1:20万区域地质调查获得的资料,重点介绍区内下、中三叠统的代表性剖面。区内下、中三叠统与扬子区相似,同系一大海进旋回,生物、岩性均可对比。本文将区内下、中三叠统生物群分为五个组合:安尼西阶上部的菊石组合,下部的古氏脊蛤不规則亚种——奇异弱海扇组合;奥伦尼阶的差棱正海扇——乌苏里翼蛤组合;印度阶上部的多饰正海扇组合,下部的王氏克氏蛤组合。认为中旬的下、中三叠统与丽江为同一地层区。
Based on the data obtained from the 1: 200,000 regional geological survey, this paper focuses on the representative sections of the Lower Triassic and Middle Triassic. The area, the Middle Triassic and the Yangtze area is similar to the same system of a large sea into the cycle, biology, lithology can be compared. In this paper, the Lower and Middle Triassic biota are divided into five assemblages: the ammonite assemblage in the upper part of the Anisei Formation, the irregular subspecies of the genus Rhipothecium-singular weak sea fan in the lower part, the Orenny step The difference is positive sea fan - Wusuli Wings clam combination; India is more than the upper part of the decorative sea fan combination, the lower part of the Clackerii combination. The middle and lower Triassic and Lijiang are considered as the same stratigraphic zone.