沉积时代为中更新世晚期至晚更新世。
Its sedimentary time is around the late stage of Middle Pleistocene to Upper Pleistocene.
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.
石制品八件，发现于陕西乾县大北沟黄土之下砂砾粘土层中，和更新世晚期的哺乳类化石伴存。
Several stone artifacts and some mammalian fossils were recovered in 1963 in the sandy gravels under the Malan Loess at Dabeigou. Qianxian in Shaanxi.
石制品八件，发现于陕西乾县大北沟黄土之下砂砾粘土层中，和更新世晚期的哺乳类化石伴存。
Several stone artifacts and some mammalian fossils were recovered in 1963 in the sandy gravels under the Malan Loess at Dabeigou. Qianxian in Shaanxi.
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