在前古生代时期,也就是从地球诞生到6亿年前的这段时间,被叫做地球历史上的隐生宙。尽管早在30多亿年前生物就已经出现,但其进化却长期停滞在很低级的阶段,主要是些低等的菌藻类植物,它们留下的化石说明的情况不多,而且保存这些化石的岩层又大多经过不同程度的变质,更使得地球的早期历史不易被了解。这段时间延续了40多亿年,一般分为太古代和元古代。当地球上的古生物从以低等植物为主,演变为以有 In the pre-Paleozoic period, that is, from the birth of the earth to 600 million years ago, it was called the hidden universe in the history of the earth. Despite the emergence of living creatures as early as more than 3 billion years ago, their evolution has long stalled at very low stages, mainly low-grade algae, leaving little description of fossils and preserving these fossils Most of the strata have been altered to varying degrees, making the early history of the earth difficult to understand. This period lasted more than 4 billion years, generally divided into Archean and Proterozoic. When the earth’s paleontology from low plants, evolved to have