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。
One extinct hamster of Cricetus, for example, lived in North Africa during the Middle Miocene, but the only extant member of that genus is the common hamster of Eurasia.
一个灭绝仓鼠的Cricetus，例如，生活在北非，中东中新世期间，但现存的唯一成员，这是共同的属仓鼠欧亚大陆。
The Central Anticline Zone composed of fault-band folds and a few fault-propagation folds, which started to form during Miocene to the middle stage of Pliocene.
中部背斜带中发育的构造主要为断层转折褶皱和少量断层传播褶皱，开始形成于中新世上新世中期；
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