三迭纪早、中期, 内陆盆地迅速下沉, 气候更趋干燥炎热, 继续沉积巨厚的陆相红色泥岩、碎屑岩。大量出现脊椎动物生物群。中三迭世末期, 受印支期构造运动影响, 盆地一度上升, 受短期风化侵蚀, 造成地层间(二马营组和延长组)的假整合和角度不整合接触。晚期地壳缓慢下降, 气候转向湿润温暖, 红色地层减少, 开始沉积灰绿色碎屑岩及煤层透镜体等有机物质。植物开始繁盛, 为河湖相沉积特征北京翻译公司。末期受印支晚期构造运动影响, 盆地全面上升, 地层广泛遭受侵蚀剥蚀。

In early and middle Triassic period, interior basin rapidly sinks; the climate tends to be drier and more burning hot, continuously deposits extremely thick continental red mudstone and clastic rocks. Vertebrate biota is appeared in mass. At the end of Middle Triassic, affected by tectonic movement in Indo-Chinese epoch, the basin rises up for a time, is eroded by short-term weathering, and then causes the disconformity between stratums (Ermaying Formation and Yanchang Formation) and angular unconformable contact. In late Triassic period, the crust slowly declines, the climate turns to humid and warm, red stratum is reduced, begins to deposit grey green clastic rocks and coal seam lens and other organic matters. The plant begins to bloom and becomes fluvio-lacustrine facies sedimentary characteristics. At the end of Triassic period, it is affected by tectonic movement in late Indo-China epoch, the basin entirely rises up and the stratum is widely eroded.    

侏罗纪早期, 地壳开始逐渐下沉, 气候由干燥炎热的氧化环境渐变为温暖湿润的还原环境, 植物开始大量繁盛, 沉积了灰绿色、灰色含煤细砂页岩地层。到早侏罗世晚期, 地壳震荡式下降, 沉积盆地由东向西不断扩大, 在丘陵地形上发育了沼泽湖泊, 气候变得更为温暖湿润, 植物生长茂盛, 成为良好的造煤期上海翻译公司。