The third fold developed between late early Pleistocene and early Middle Pleistocene.
早更新世晚期，中更新世初期，第三排褶皱开始形成。
There was lake development during late Pleistocene in the Yanhuai basin.
延怀盆地晚更新世发育湖相沉积。
Its sedimentary time is around the late stage of Middle Pleistocene to Upper Pleistocene.
沉积时代为中更新世晚期至晚更新世。
The second fold developed between late the Miocene and the initial stage of Early Pleistocene.
上新世晚期，早更新世初期，第二排褶皱开始形成。
During the Late Pleistocene, these caves were dry.
到了更新世后期，这些洞穴是干燥无水的。
During the Late Pleistocene, these caves were dry.
到了更新世后期，这些洞穴是干燥无水的。
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