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地层单位的划分是地质工作中最基本的问题之一,它是一项具体的地质业务工作,也涉及一些值得研究的理论问题.地层单位划分原则的合理运用及其合理划分,关系到地层的合理乃至正确对比、以及能否获得符合客观情况的古地理环境的推断或结论.划定地层界线的最早依据是明显的自然界线,如不整合、假整合、岩性突变等.由于化石广泛分布在一定时代的地层中,化石在地层垂向的变化,也可用来划分地层,因而出现了生物地层学,它被地质学家普遍地
The division of strata unit is one of the most basic problems in geological work, it is a specific geological work, and also involves some theoretical issues worthy of study.The rational use of stratigraphic unit division and its reasonable division, related to the stratigraphic Reasonable and even correct comparisons, and whether it can be inferred or concluded that palaeogeographic environments conform to the objective conditions can be obtained.Early basis for delineating stratigraphic boundaries is obvious natural boundaries, such as unconformity, false integration, lithological mutation, etc. Due to the widespread distribution of fossils In a certain period of strata, fossil vertical changes in the strata can also be used to divide the strata, which led to the emergence of bio-stratigraphy, which is geologically popular