层序多显示相对的海平面以及广泛分布的不整合，沉积作用的过程，沉积物的来源，气候和构造活动等随地质时代变化的旋回性。
Sequences tend to show cyclicity of changes in relative sea level and widespread unconformities, processes of sedimentation and sources of sediments, climate and tectonic activity over time.
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.
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