Comprehensive researches have concluded that the Heishan ophiolite was formed in Nanhua Ordovician period and its structural location in Silurian period early Middle Devonian epoch.
综合研究得出黑山蛇绿岩形成于南华—奥陶纪，构造就位于志留纪—早中泥盆世。
In early Ordovician North Qilian region again stretched and suffered second oceanization, up to middle Ordovician a mature ocean basin with a trough-arc-basin system already formed.
早奥陶世北祁连地区再次拉张，遭受第二次大洋化，到中奥陶世形成具沟弧盆体系的成熟大洋。
The synthetical studies show the reservoir of the area beneath Salt of middle-lower Ordovician is bad than the north area of the early Hercynian rock-solution development.
综合分析结果表明，盐下地区中下奥陶统储层稍劣于北部海西期岩溶发育地区。
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