龙门山中段埃姆斯期群落分析及生态环境模式

ANALYSIS AND HABIT MODEL OF PALAEOCOMMUNITES OF EMSIAN IN THE MIDDLE SECTION OF LONGMEN MOUNTAINS

龙门山中段白石 -长河坝大型飞来峰泥盆纪地层发育 ,埃姆斯期划分为四个古生物群落。本文详细分析了养马坝组 Zdmir群落和 Xenospirifer fongi群落的生物组成、丰度、生活方式及生态环境。首次发现龙门山区以 Zdmir一属为主的生物群落受生态环境控制明显 ,可以出现在 Xenospirifer fongi群落之下 ,其时代属晚埃姆斯期 ,并建立了早泥盆世埃姆斯期群落的生态环境模式。

Devonian is widely distributed in Baishi Changheba klippe in the middle area of Longmen Mountain.Four communities in Emsian are recognized. The composition of organisms,the abundance of each taxon,the living style and habits of Zdmir community and Xenospirifer fongi community of late Emsian are analysed. It is discovered in the first time in Longmen Mountains that Zdmir community lies below the Xenospirifer fongi community and is controlled by living habit.Both of them belong to Late Emsian. The habit model of communities of Emsian in Early Devonian is established in this paper.