不整合界限地层单位确立及划分的重要意义──兼论华北地层区不整合界限地层单位的划分和命名

在进行岩石地层划分时，有必要进行不整合界限地层单位的划分。不整合界限地层单位是顶底以不整合界面为限，而由有关联的若干个基本岩石地层单位──组（群）组成的组合。和岩石地层单位一样，是自然界存在的客观实体。初步建议华北地区划分为８个不整合界限地层单位：桑干河序列、五台山序列、滹沱河序列、秦幽序列、冀鲁序列、三晋序列、燕辽序列、河海序列。不整合界限地层单位的划分、确立，是进行地层格架分析、进行层序地层学研究的前提，有利于以岩石地层单位（即以不整合界限地层单位）编制小比例尺地质图。

The Significance of Establishment and Division of Unconformity Bounded Stratigraphic Units: with Note to the Preliminary Division and Naming of the Unconformity-Bounded Stratigraphic Units of North China Stratigraphic Area

It is necessary to classify the division of the unconformity-bounded stratigraphic unitswhen making lithostratigraphic divisions.An unconformity-bounded stratigraphic unit consists of interealated basic lithographic units-Formation/Group and is confined to the top andbottom unconformity interfaces. In North China stratigraphic area is prelimarily divided into8 unconformity-bounded stratigraphic units, they are Sangganhe, Wutaishan, Hutuohe, Qin-You, Ji-Lu, Sanjin Yan-Liao and He-Hai synthem. The division and estaolishment of the unconformity-bounded stratigraphic units are the premise of the stratigraphic framework analysis and sequence stratigraphic study, and also advantageous to the compilation of smallscaled geological map by using of lithographic units (i. e.unconformity-bounded stratigraphicunits ).