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本文把华南法门阶上部和杜内阶分为４个层序，自下而上依次命名为ＳＱ０、ＳＱ１、ＳＱ２和ＳＱ３。其中ＳＱ０属斯图年阶（Ｓｔｒｕｎｉａｎ）（泥盆系最顶部），其余３个层序归杜内阶。这４个层序可以与欧美等地同期的层序进行对比，表明当时的海平面升降变化及其由此而产生的沉积层序具有全球的一致性。层序地层学、生物地层学和事件地层学综合研究表明，华南浅海相区与Ｓｉｐｈｏｎｏｄｅｌａｐｒａｅｓｕｌｃａｔａ－Ｓ．ｓｕｌｃａｔａ界线一致的泥盆－石炭系界线不仅高于Ｃｙｓｔｏｐｈｒｅｎｔｉｓ带顶界，而且还应高于引起Ｃｙｓｔｏｐｈｒｅｎｔｉｓ绝灭的海退事件层的顶界。因此建议以Ｃｙｓｔｏｐｈｒｅｎｔｉｓ－Ｐｓｅｕｄｏｕｒａｌｉｎａ间隔带中最明显的一个海进面，即ＳＱ１的海进体系域的底界作为华南浅海相区泥盆－石炭系界线。这条界线与泥盆－石炭纪之交海退事件层的顶界正好一致，大致相当于Ｐｓｅｕｄｏｕｒａｌｉｎａ组合带底部
In this paper, the upper part of Famennian and the Dunenian in South China are divided into 4 sequences, named as SQ0, SQ1, SQ2 and SQ3 from the bottom up. Among them, SQ0 belongs to Strunian (the top of Devonian), and the remaining three sequences belong to the order of Dunes. The four sequences can be compared with those of the same period in Europe and the United States, indicating that the sea level changes at that time and the resulting sedimentary sequences are globally consistent. Sequence stratigraphy, bio-stratigraphy and event stratigraphy comprehensive study showed that the South China shallow marine facies and Siphonodelapraesulcata-S. The consistent Devonian-Carboniferous boundary of the sulcata line is not only above the top of the Cystophrentis band, but also above the top of the regressive event layer that caused Cystophrentis to extinguish. Therefore, it is suggested that the boundary between Devonian and Carboniferous in southern China shallow marine facies should be the bottom boundary of the sea system tract of SQ1, which is the most obvious one of the Cystophrentis-Pseudouralina intercepts. This boundary line exactly coincides with the top of the Devonian-Carboniferous regressive event layer, roughly equivalent to the bottom of the Pseudouralina zone