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。
Youngest occurrences were found from the Middle Miocene of North America, the Pliocene of Europe, and the Pleistocene of Asia.
它们现在的构造格局基本上是在晚上新世或早更新世奠定的。
Their tectonic framework was basically underlain in early Pleistocene or late Pliocene.
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。
Isotopic dating and regional stratigraphic correlation indicate that the Xigeda Formation is Pliocene-Early Pleistocene sediment.
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