猛犸象在第四纪晚期灭绝了。

Woolly mammoths died out during the late quaternary period.

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晚期(第四纪)为塌陷阶段，造成了贝加尔凹陷的现代构造。

The later stage (Anthropogene) was marked by collapses, which were responsible for the present structure of the Baikal depression.

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第四纪早期湖深水淡，晚期湖浅水咸。

In late Quaternary the lake shallowed and its water became salt-water.

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