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中国的海相三迭系,在四川盆地发育完整,分布广泛,历年来作了不少的研究工作。特别在近几年来,四川石油局、四川钾盐队、西南地质研究所等单位,作了很多的野外实测剖面工作,并提出了极有价值的资料。但对中下三迭统的分界划分,还存在着不同的看法。成都地质学院三迭纪专题科研队,于1963年5月,在四川盆地南缘宜宾专区珙县境内,测制了三迭系剖面。剖面的具体位置,沿珙县至底硐公路水电厂及洛旺坝附近。剖面的构造位置处于娄山褶皱中段前缘部分,长宁背斜西端之南翼。通过剖面的野外测制,结合室内初步化石群的鑑定,对川南中下三迭统分界,提出了笔者的初步意见。部
Triassic sea-three of China, Sichuan Basin in the development of a complete, widely distributed over the years made a lot of research work. Especially in recent years, Sichuan Petroleum Bureau, Sichuan Potash team, Institute of Southwest Geology and other units, made a lot of the field profile of the survey, and put forward valuable information. However, there are still different opinions on the demarcation of the three central regions. Triassic discipline research team of Chengdu Institute of Geology, in May 1963, in the southern margin of Sichuan Basin Yibin Yibin area, the measured Triassic profile. The specific location of the section, along the Shexian Road to the end of the underground hydropower plant and near Lo Wang dam. The structural position of the profile lies in the front part of middle Loushan fold, the south wing of the west end of Changning anticline. Through the field test of the profile and the identification of the initial fossil assemblages in the interior, the preliminary opinions of the author are put forward for the boundary of the Middle and Lower Triassic in southern Sichuan. unit