pleistocene epoch造句

1、The Pleistocene Epoch was an ice age.
更新世是一段冰河时代。

2、The Pleistocene Epoch or system of deposits.
更新世时期或更新世沉积物系统

3、Xijiang riverbed has obviously superimposed since Middle Pleistocene Epoch at latest.
最晚自中更新世以来西江河床叠置很明显。