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一、前言云南省西北部的中甸地区,属松潘甘孜印支褶皱系义敦优地槽褶皱带的南延部份,其东南与扬子准地台盐源——丽江台缘褶皱带相邻。区内三迭系十分发育,出露也很齐全,是研究三迭系比较理想的区域。早在1898年,洛采(Loezy)在中甸发现了属拉丁尼克期的Myophoria elegansDunker,M.cf.laevigata Goldfuss,M.radiata Loezy等化石。1947年,德人米士(Misch)曾往滇西调查地质,将丽江、鹤庆、剑川一带的三迭系划分为四个组,
I. INTRODUCTION The Zhongdian area in the northwestern part of Yunnan Province belongs to the southern extension of the Yidun Youdegou fold belt in the Indosinian fold belt of the Songpan Panyu, and is adjacent to the Yanyuan-Lijiang Taiwan margin fold belt in the southeast of the Yangtze Platform . The Triassic system in the area is very developed and exposed. It is also an ideal area for studying Triadimension. As early as 1898, Loezy discovered fossils of Myophoria elegans Dunker, M.cf.laevigata Goldfuss and M. radiata Loezy in the Midlands. In 1947, German Misch (Misch) had investigated the geology in Western Yunnan and divided the Triassic series in Lijiang, Heqing and Jianchuan into four groups,