塔中隆起上奥陶统凯迪阶良里塔格组生物群及其古生态特征

BIOTA AND PALAEOECOLOGY OF THE LIANGLITAG FORMATION(KATIAN,UPPER ORDOVICIAN),CENTRAL TARIM,NW CHINA

塔中隆起区的良里塔格组含菌藻类微生物岩、植物类的钙藻、原生动物中的有孔虫、后生动物中的海绵、珊瑚、苔藓虫、介形类、三叶虫、腹足类、腕足动物、棘皮动物等化石门类。根据其生物成分的埋葬学特征,分为原地或近源成分占优势的群落和远源异地成分占优势的组合,群落和组合的类型展布受水深、水动力、坡折带地貌等因素控制。

Biota of the Lianglitag Formation(Lower Katian,Upper Ordovician)from the Central Tarim Uplift(Xinjiang,western China)include mainly microbialites,calcareous algae,foraminifera,sponges,corals,bryozoans,ostracodes,trilobites,gastropods,brachiopods,crinoids etc.According to taphonomic characters,particularly with their breakage and stacking density as the indices of proximal and distal transportation,the ecological units are recognized as communities and associations.The temporal and spatial distributions of these units are apparently controlled by the depth,energy and the distance from the formation's Slopebreak I.