贵州独山泥盆纪生物地层以及珊瑚的四次灭绝事件的研究

DEVONIAN BIOSTRATIGRAPHY OF DUSHAN,SOUTHERN GUIZHOU AND ITS CORAL EXTINCTION EVENTS

贵州省独山县县城附近的泥盆纪浅海相地层发育良好 ,底栖生物化石丰富 ,研究历史悠久 ,是我国南方浅海相泥盆系的标准剖面之一。文章从珊瑚化石的角度进行生物地层和群落生态的分析 ,并建立独山中、晚泥盆世 7个珊瑚组合。文章最后还着重阐述独山泥盆纪珊瑚的 4次灭绝事件 :1)mid Eifelianevent (发生在龙洞水段之顶 ) ;2 )late Givetianevent (发生在鸡窝寨段之顶 ) ;3)F Fevent (发生在靠近尧梭组之底 ) ;4 )D Cevent (发生在革老河组之顶 )。其中 ,F F大灭绝事件对珊瑚群的影响最大。

The shallow marine Devonian is well developed in Dushan, southern Guizhou and rich in fossil corals. The Devonian corals in Dushan flourished in a nearshore shallow water environment and all coral communities fall in the range of BA3 and BA4 (equivalent to the upper part of subtidal) in the Pedder and McLean's benthic assemblage scale.