【摘要】 本文记述了产于四川龙门山地区中、上泥盆统界线附近观雾山组和土桥子组的四射珊瑚。在大量珊瑚标本鉴定的基础上,建立了中泥盆世晚期至晚泥盆世初期的四个四射珊瑚化石组合。根据四射珊瑚的演化规律,确定以Peneckiella珊瑚类的兴起和Pseudozaphrentis hejiazhaiensis,Temnophyllun(Truncicarinulum)beichua-nensis珊瑚类的消失作为龙门山地区识别中、上泥盆统界线的标志。更多还原

【Abstract】 The rugose corals described in the paper were collected from the D3/D2 boundary beds-the Guanwushan Formation and Tugiaozi Formation in the Longmens-han area.The 19 genera and the 45 species, including 5 new species, can be grouped into the following four coral assemblages. Upper Devonian:4. Peneckiella concabotabulata-Peneckiella shawoziensis assemblage; Middle Devonian:3. Pseudozaphrentis hejiazhaiensis-Temnophyllum(Truncicarinulum)beichuanensis assemblage, including 2 subassemblages; ( 2 ) Pseudozaphrentis he jiazhaiensis subassemblage; ( 1 ) Temnophyllum ( Truncicarinulum ) beichuanensis-Temnophyllum ( Truncica-rinulum ) aiensis subassemblage;2. Sinospongophyllum pseudocarinatum-Sinospongophyllum longmenshanense assemblage;1. Temnophyllum waltheri assemblage.The lower limit of Pcnechiella assemblage is roughly coincident with the lower limit of Polygnathus asymmetricus conodont zone.It can be regarded as the mark for recognizing the D3/D2 boundary in the Longmenshan area.更多还原