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新生代的第四纪是地球发展史的最近一页,它又分为更新世和全新世两个时期。全新世就是地质学上的“现代”。据研究,第四纪历时大约100万年,与地球发展的整个历史来比较,是非常短暂的。地球经过了几十亿年的长期发展,到了最近的阶段——新生代,生物界出现了一个飞跃:先是在第三纪出现了种类繁多的哺乳动物,其后是在第四纪出现了动物中最高级的人类。事物是不断发展的,而且不是固定地沿着一个方向发展而不变
The Quaternary of the new generation was the last page of the history of the earth’s development. It was divided into two periods, the Pleistocene and the Holocene. The Holocene is the “modern” in geology. According to studies, the Quaternary period lasted about 1 million years. Compared with the entire history of the earth’s development, it is very short-lived. The earth has undergone long-term development of several billion years. At the recent stage, the new generation, there has been a leap forward in the biosphere: firstly there appeared a wide variety of mammals in the Tertiary Period, and then there were animals in the Quaternary Period. The most advanced humans. Things are constantly evolving, and not fixedly moving in one direction without changing