湖北郧西奥陶纪微古植物群  

The Ordovician Microflora in Yunxi,Hubei

作　　者：孙淑芬[1] 

机构地区：[1]中国地质科学院天津地质矿产研究所

出　　处：《地球学报（中国地质科学院院报）》1999年第1期105-110,T002,共7页Acta Geoscientia Sinica

摘　　要：本文研究的微古植物均发现于湖北省郧西县三官洞乡卡子陈家庄奥陶纪地层剖面，共５００余粒，计１８属３４种，其中Ｐｉｒｅａａｐｅｒｔｕｒａ为新种。其微古植物的组合特征与沉积环境有密切关系，在水田河组，由于光线充足、盐度正常、水能较高、营养物质丰富，单细胞浮游藻类大量繁衍，以个体较大，表面纹饰较复杂的分子为主，并伴有腹足类及海百合茎的出现。吊床沟组，由于气温干燥，盐度高，微古植物仅适应那些结构简单，个体小，膜壳厚而坚密的种类才能繁衍。本区微古植物特征表明与波罗的海区关系密切。A microflora with about 500 individuals including 18 genera and 34 species was collected from the Ordovician section of Kazi to Chenjiazhuang,Sanguandong,Yunxi County,Hubei. Pirea opertura is a new species,and its character is as follows: Pirea Vavrdova,1972 Pirea colliformis (Burmann)Vavrdova,1977 Pirea apertura Sun sp.nov. (PI.II,fig.7) Holotype: PI.II,fig.7,No.YNP 3V 133 Description: Vesicle pear_shaped in outline.55μm in length and 30～35μm in width.There is a process in tip,process 8μm in width at basal part,4μm in length.Surface of vesicle and process ornamented with little spines with 0.5～1μm in length,slight expansion in close tip.Excystment with a pylome in basal part of vesicle. Comparison: The species differs from other species known of the genera in that there is excystment with a pylome in basal part of vesicle. Occurrence: Ordovician Shuitianhe Formation of Yunxi County,Hubei.

关 键 词：微古植物群 奥陶纪 湖北郧西 地层 古植物 

分 类 号：Q913.642[天文地球—古生物学与地层学]