什么是地质年代?古生物学家借助标准化石将地球发展史分为了四大阶段。不存在硬体化石的远古时代被称为寒武纪,即寒武纪之前的时代。紧跟其后的是古生代、中生代和新生代。古生代始于5亿4200万年前,中生代始于2亿5100万年前,新生代离我们最近,始于6500万年前,并且一直持续到现在,也就是说,我们生活在新生代。 What is geologic age? Paleontologists use standard fossils to divide the history of the Earth into four major phases. The ancient era in which no fossil fossils existed was called the Cambrian, the pre-Cambrian era. Followed by the Paleozoic, Mesozoic and Cenozoic. The Paleozoic began 542 million years ago. The Mesozoic began at 251 million years ago. The Cenozoic is closest to us, starting 65 million years ago, and continues to the present day. That is to say, we live in the Cenozoic.