一、前言西藏东部的上三叠统,四川省地质矿产局第三区域地质测量队(1970)自下而上命名为甲丕拉组、波里拉组和巴贡组。甲丕拉组是紫红色砾岩、含砾砂岩和砂岩及页岩,不整合在古生界不同层位之上,产叶肢介和瓣鳃类化石。巴贡组是黑色页岩、粉砂岩和灰色长石石英砂岩、炭质页岩的互层, I. INTRODUCTION The Upper Triassic in the eastern Tibet and the third regional geological survey team (1970) of the Bureau of Geology and Mineral Resources of Sichuan Province are named Bottom-Up, Methylpiride, Porila and Bagong formations. The Hippophae Formation is a mauve conglomerate, pebbly sandstone and sandstone and shale that are not integrated over different layers of the Paleozoic. They produce foliar limbs and flap gill fossils. The Bagong Formation is an interbedded layer of black shale, siltstone and gray feldspar quartz sandstone and carbonaceous shale,