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地质学上.依据所对应地层的生命特征将地球46亿年的历史分成了前后两个部分:前面是没有明显生命迹象的隐生宙,后面是有了明显生命痕迹的显生宙。显生宙中又根据动植物形态的重大变化划分出三个代,分别是古生代、中生代和新生代;中生代是裸子植物兴盛和恐龙等爬行动物横行的时代,分为三叠纪、侏罗纪和白垩纪三个纪。新生代则是被子植物和哺乳动物兴盛的时代,包括
Geologically, according to the characteristics of the corresponding strata, 4.6 billion years of earth’s history is divided into two parts: the front is a hidden life without obvious signs of life, followed by a visible life mark. The Phanerozoic is divided into three generations according to the major changes in the flora and fauna: the Paleozoic, Mesozoic and Cenozoic. The Mesozoic era is a reptile era where the gymnosperms prospered and the dinosaurs were rampant. They were divided into Triassic and Jurassic And Cretaceous three discipline. Cenozoic era is the era of angiosperms and mammals, including