In the early pleistocene Epoch, due to long-term weathering and denudation, the area where West Lake was located developed into a broad valley.

早更新世，由于长期风华剥蚀，西湖所在地区形成一宽古。

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By the early part of the twentieth century, scientists believed that four distinct glaciations had affected North America and Europe during the Pleistocene epoch.

到二十世纪初，科学家们认为，在更新世期间，有四次不同的冰川作用对北美和欧洲产生了影响。

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The Yumen fault has been active since the Early Pleistocene to the present day, so it is an active fault during the Holocene Epoch and a causative fault of the Yumen earthquake.

玉门断裂自早更新世以来一直活动，是现代地震断裂，也是玉门地震的发震断裂。

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