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前言 地层分区的作用在于正确反映各区地层发育的总体特征,便于概括各地质时期地层沉积类型的空间分布及其在时间上的发展变化,以服务于地层区测工作和成层矿产找矿的布署和规划,也有利在区域地层、区域地质以及地层古生物的总结或专著中,合理地进行分区论述,并可用以印证构造单元的划分,为区域构造史的研究提供恰当的依据。
Preface The role of stratigraphic subdivision is to correctly reflect the overall characteristics of the stratigraphic development in each area and to facilitate the generalization of the spatial distribution of stratigraphic sedimentary types and their development and changes over time in various geologic periods in order to serve the geological prospecting work and the stratigraphic mineral prospecting cloth Department and planning, but also conducive in the regional stratigraphy, regional geology and stratigraphic paleontology summary or monograph reasonable division of the discussion, and can be used to confirm the division of tectonic units, to provide an appropriate basis for the study of regional structural history.