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一、前言四川龙门山北段泥盆系发育良好,化石丰富,层序清楚,剖面连续,是研究我国泥盆系较好的地区之一。它在国民经济及生物地层研究上都具有重要的意义。 1953年包茨、彭开启等,对这一地区泥盆系进行了系统的研究;1956年乐森(王寻)又在他们的基础上做了进一步的分层和化石分带工作;至此,本区泥盆系生物地层系统基本建立。随着研究工作的深入,对甘溪组的时代归宿问题出现明显的分歧和争论。例如:1959
I. Preface The northern Devonian of Longmen in Sichuan Province is well developed with rich fossils, clear sequence and continuous profile. It is one of the better studied Devonian in China. It is of great significance in the study of national economy and biological strata. In 1953, Bauc et al., Peng Kai et al. Conducted a systematic study of the Devonian in this area. In 1956, Le Sen (Wang Xun) made further stratification and fossil zonation on their basis. At this point, The Devonian biological stratum system in this area is basically established. With the deepening of research work, obvious divergence and controversy have emerged on the issue of the end of the Ganxi Formation. For example: 1959