pliocene and early pleistocene 上新世至早更新世
There are more than 200 volcanic hills, mainly occurring in the Miocene, Pliocene and Pleistocene in the region.
该地区分布着两百余座大大小小的火山，形成于中新世、上新世和更新世。
Youngest occurrences were found from the Middle Miocene of North America, the Pliocene of Europe, and the Pleistocene of Asia.
最晚的化石记录分别发现于北美的中中新世、欧洲的上新世和亚洲的更新世。
Isotopic dating and regional stratigraphic correlation indicate that the Xigeda Formation is Pliocene-Early Pleistocene sediment.
结合同位素地质年龄，区域对比分析，确认昔格达组属上新世至早更新世沉积。
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