地层与化石周静所谓地层，指的是地壳在发展过程中形成的各种成层岩石的总称。本文所说的地层主要指的是具有层理和化石的沉积岩。而化石则是保存在地层中的古生物遗体或遗迹，如动物的骨骼、硬壳、足迹等等。在研究地球演变历史的过程中．地层和化石所起的作用是不同的。... Stratum and fossil Zhou Jing The so-called strata, refers to the crust in the development process of the formation of a variety of stratified rock. The strata mentioned in this paper mainly refer to sedimentary rocks with strata and fossils. Fossils, on the other hand, are the remains or relics of paleontology preserved in formations, such as animal bones, crusts, footprints, and more. In studying the history of the Earth’s evolution. Strata and fossils play a different role. ...