早更新世晚期，中更新世初期，第三排褶皱开始形成。
The third fold developed between late early Pleistocene and early Middle Pleistocene.
上新世晚期，早更新世初期，第二排褶皱开始形成。
The second fold developed between late the Miocene and the initial stage of Early Pleistocene.
研究同时表明，太行山中段上新世晚期以来的隆升主要发生于上新世末到早更新世时期。
It is shown that the uplift of the middle Taihang Mountains occurred mainly between the end of Pliocene and Early Pleistocene.
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