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。
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。
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