The Helanshan region underwent several times of extension and showed strong characteristics of "multi-cycle" movement before the Cenozoic era.
贺兰山地区在新生代之前经历了几次区域性的伸展活动，表现出显著的“多旋回”构造特点。
The Helanshan region underwent several times of extension and showed strong characteristics of "multi-cycle" movement before the Cenozoic era.
贺兰山地区在新生代之前经历了几次区域性的伸展活动，表现出显著的“多旋回”构造特点。
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