中国四川龙门山地区泥盆系牙形石

龙门山地区泥盆系地层发育，厚度大，一般为２０００－４００００ｍ，最厚达５０００ｍ以上，化石丰富，门类众多。主要有腕足类、珊瑚、双壳类、三叶虫、头足类、竹节石和层孔虫等。碳酸盐岩地层中发现了大量的牙形石。作者对桂溪、雁门坝和硫铁矿三条剖面中的牙形石做了系统工作，在雁门坝和硫铁矿剖面中，发现了丰富的Ｐａｌｍａｔｏｌｅｐｉｓ（蹼刺）。经分析研究，将该区泥盆系划分出１３个牙形石带和组合。在此基础上，对泥盆系的地层单元及下、中、上泥盆统之间的界线进行了划分，对该区泥盆纪的古生物地理进行了分析。

DEVONIAN CONODONTS FROM LONGMEN MOUNTAIN AREA OF SICHUAN, CHINA

Devonian strata in the Longmen Mountain area are welldeveloped with a thickness generally of 2000-4000m,or over 5 000m.A number of conodonts are found in the carbonate rocks,associated with rich macrofossils of brachiopeds,corals,bivalves,trilobites,cephalopeds,tenta culitids, and stomatoporoids.Systematic research has been undertaken in three sections:Guixi,Yanmenba and Liutiekuang.For the first time abundant conodont specimens Palmatolepis have been discovered in Yanmenba and Liutiekuang sections. After an analytical study,the authors divided the strata into 12 Devonian conodont zones and assemblages and one Lower Carboniferous zone.Here are correlations of the sections,with a discussion on the paleobiogeography of the De vonian period in this area.