Pleistocene
/ˈplaɪstəʊsiːn/adjective
1- Geology of, relating to, or denoting the first epoch of the Quaternary period, between the Pliocene and Holocene epochs【地质】（与）更新世（有关）的。
1.1
- as noun
the Pleistocene
the Pleistocene epoch or the system of deposits laid down during it更新世; 更新世沉积物。
The Pleistocene epoch lasted from 1, 640, 000 to about 10, 000 years ago. It was marked by great fluctuations in temperature that caused the ice ages, with glacial periods followed by warmer interglacial periods. Several forms of fossil human, leading up to modern humans, appeared during this epoch.
词源
mid 19th cent.: from Greek pleistos 'most' + kainos'new'.