试论地层单位的划分

前言地层单位的划分是地层学研究的主要内容之一,也是地质工作经常遇到和需要解决的一个基本问题。因此,如何正确与合理地划分地层单位并在此基础上进行地层对比使之符合客观实际,则不仅关系到地层学的发展,而且也影响到地质填图的质量和普查找矿以及成矿预测等项工作的效果。 1960年,我国出版的《地层规范草案及地层规范草案说明书》（以下简称《规范》）曾就地层的分类,地层单位的划分以及命名等作过一系列的规定,为后来的地层工作起过积极

ON STRATIGRAPHIC CLASSIFICATION

Stratigraphic classification is an important component part in stratigra- phy as well as the foundation of geological work. It not only concerns some basic principles and theories and methodology in the study of stratigraphy but also directly influences the quality of geological mapping and other geolog- ical work. Although the concept of multiple stratigraphic classification has been quite prevalent abroad recently,it has not received due attention,nor been used universally yet at home because traditional stratigraphy has had profound- influences in China. In regard to this situation,some deficiencies in aspects of stratigraphic classification,nomenclature and correlation are discussed in this paper. It should be pointed out that the "Stratigraphic Code of China" promul- gated in the 1960s only reflects the knowledge at the time of its drafting or embodies the concepts and principles 20 years ago,and even the most recent- ly promulgated" Stratigraphic Guide of China" will requite revision in the future with the development of stratigraphy. The development of new concepts and techniques during the past two decades has brought about great changes in earth sciences including stratigra- phy. This situation urges us to be bold in rejecting some traditional ideas negated already by scientific research,use new basic principles and concepts to consider,check and verify the early stratigraphic work again,make full use of new techniques and methods in an indepth study of various character- istics inherent in stratigraphy and gain a complete knowledge of the laws of their temporal and spatial distribution so that the stratigraphic study in China will get rid off the limitations of traditional geology and stride into the rank of up-to-date sciences as soon as possible.