一、前言近几年的调查研究表明,甘肃东部的早侏罗世地层颇为发育,并含有较为丰富的古植物化石.地层出露于靖远刀楞山、兰州阿干镇和天祝炭山岭等地侏罗纪沉积盆地中,系纯陆相沉积.本区侏罗系皆沉积于较小的山间盆地之中.这些孤立的盆地因为受相似的古地理、 I. Preface In recent years, investigations and studies have shown that the Early Jurassic strata in eastern Gansu developed quite well and contain rich ancient fossils, and the strata were exposed in the Jinglun Mountains, the Agan Township in Lanzhou and the Tianzhu Charcoal Mountains and other Jurassic sedimentary basins, the Department of pure continental deposition.The Jurassic in this area are deposited in the smaller mountain basin.These isolated basins because of similar paleogeography,