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分布于博格达山西南缘的桃西沟群,是一套典型的山间磨拉石相构造—沉积组合,时代为早二叠世,它是博格达火山弧演化为褶皱带的造山作用晚期阶段,由边缘岛海环境突发性地快速转化为陆相构造—沉积环境的产物。
The Tao Xigou Group distributed in the southern margin of the Bogda Mountains is a typical mountain milla-facies tectono-sedimentary assemblage dating from Early Permian, which is a orogenic belt with the Bogda volcano arc evolving into a fold belt In the late stage of action, the environment of the marginal island sea suddenly and rapidly transformed into the product of continental facies-sedimentary environment.