the sub-tectonic unit, chaiwopu sag, which lies in the south margin of the basin, was a small intermountain superimposed sag developed on the fold basement of upper carboniferous.
其中的次级构造单元柴窝堡凹陷位于盆地南缘,是一个在下石炭统褶皱基底上发育起来的小型山间叠合凹陷。
dating the gaolan group in the central qilian fold basement is important for reconstructing the evolution of the qilian orogenic belt.