龙门山中段观雾山组生态地层特征及意义  

Characteristics and Significance of Ecostratigraphy of Guanwushan Formation in the Middle Part of Longmen Mountains

作　　者：赵兵[1] 王建坡[1] 

机构地区：[1]成都理工大学地球科学学院,成都610059

出　　处：《沉积学报》2004年第1期47-53,共7页Acta Sedimentologica Sinica

摘　　要：根据生态地层的基本原理及工作方法 ,将区内观雾山组划分为五个古生物群落 ,即Amboglossa Emanuella群落 ,Septascolipora Frachastraea群落 ,Variatrypa Ypsilorhynchus群落 ,Stringocephalus群落及Zhonghuacoelia Leiorhynchus群落 ,并讨论了各群落的生物组成、相对丰富度、生态环境及群落时限 ,在此基础上 ,建立了观雾山期生态地层格架。重新认识了龙门山区Ypsilorhynchus的时限。研究表明 ,生态地层能提高地层划分对比的精度及古生物化石的地层价值 ,为认识古环境及沉积盆地演化提供新资料。The lithological associations, basic sequences and sedimentary environments are discussed in this paper. Five palaeocommunities in Guanwushan Formation are recognized according to fundamentals and working methods of ecostratigraphy.They are Amboglossa Emanuella community (A-E), Septascolipora Frachastrata community (S-F), Variatrypa Ypsilorhynchus community (V-Y), Stringocephalus community(S) and Zhonghuacoelia Leiorhynchus community (Z-L). The organisms, relative abundance, ecotype and time interval of each community are analysed, on the basis of which the ecostratigraphic framework of Guanwushan period has been establised. New viewpoint on the time interval of Ypsilorhynchus in Longmen Mountains has also been proposed for the first time. It can be seen that ecostratigraphy could improve the precision of stratigraphic classification and correlation and the stratigraphic value of fossils. And many new evidences on palaeoenvironments and evolution of sedimentary base could be acquried from ecostratigraphic study.

关 键 词：生态地层 古生物群落 环境 古生态 观雾山组 

分 类 号：Q911.6[天文地球—古生物学与地层学]