They also do not belong to the south meta-volcanic rock series of Northern Qilian Caledonides tectonic belts. 也不属于北祁连加里东构造带南带变质火山岩系的一部分。
The evolution between North China Sea and Qilian Sea of the Ordovician in Ordos Basin has been remained one of the problems for many years. 摘要鄂尔多斯盆地奥陶纪华北海与祁连海演变关系是多年来研究中的一大难题。
