Since the Late Permian, studied region was in a stable sedimentary setting, forming molasses with large thickness that overlie the olistostrome, and then evolved gradually into a Triassic pene-planed environment that is characterized by uplifting-erosion of ranges and accumulation of basins. 从晚二迭叠世开始,全区处于相对稳定的剥蚀-堆积环境中,形成了厚度较大的磨拉石,并逐渐演化为三叠纪的准平原化环境。