修订《中国地层指南及中国地层指南说明书》（以下简称《指南及说明书》），是第二届全国地层委员会筹备召开第三次全国地层会议的又一项重要准备工作。其目的在于，为适应和迎接新世纪中国地层工作的更大发展的需要，向全国地层工作者建议和推荐一套适合中国特点的地层学术语 The revision of the “Guideline on Stratigraphy of China and Guidelines for Stratigraphy of China” (the “Guidelines and Instructions”) is another important preparatory work for the second National Stratigraphy Commission in preparing for the third national stratum meeting. Its purpose is to recommend and recommend a set of stratigraphic terminology suitable for Chinese characteristics to national stratigraphic workers in order to meet and meet the need of greater development of stratigraphic work in China in the new century