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本文讨论了龙门山中段白石-苟家大型飞来峰内早埃姆斯期的甘溪组分布及岩性特征。首次将甘溪组划分为两个生态地层单元,即 Anetoceras-Plectodonta 群落及 Dicoelostrophia-Eosophragmophora 群落;指定了群落的层型剖面,分析了各群落的生物组成、丰富度、生态特征及生态环境。认为区内早埃姆斯期属深水陆棚至深水盆地沉积环境,为龙门山区泥盆纪沉积盆地的性质和演化提供了新资料。
This paper discusses the distribution and lithology of Ganxi Formation in the Early Amesian period from the Baishi-Goujia large-scale fly-peak in the middle Longmen Mountains. For the first time, the Ganxi Formation is divided into two ecologically stratigraphic units, the Anetoceras-Plectodonta community and the Dicoelostrophia-Eosophragmophora community. The community-type layer profile is assigned to analyze the biological composition, richness, ecological characteristics and ecological environment of each community. It is considered that the early Ames period in the area is a sedimentary environment from the deepwater shelf to the deepwater basin and provides new information for the nature and evolution of the Devonian sedimentary basin in the Longmenshan area.