湖北省郧西县武当山群变沉积岩组微古植物群及其地层意义  

MICROPALAEOFLORA OF THE METASEDIMENTARY FORMATION OF WUDANGSHAN GROUP IN YUNXI, HUBEI PROVINCE AND ITS STRATIGRAPHICAL SIGNIFICANCE

作　　者：孙淑芬[1] 刘文兴[1] 

机构地区：[1]中国地质科学院天津地质矿产研究所,天津300170

出　　处：《前寒武纪研究进展》1998年第1期56-64,共9页Progress in Precambrian Research

摘　　要：在湖北省郧西县武当山群变沉积岩组中共发现微古植物15属30种。在微古植物组合中以球状藻类为主并出现膜壳表面纹饰较复杂的分子如：Lophominuscula,Lophosphaeridium和Micrhystridium。以上微古植物组合特征充分显示了我国震旦系的特色。Micropalaeoflora, 15 genera, 30 species are discovered in metasedimentaryFormation of Wudangshan Group, Yunxi Chunty, Hubei Province. In the assemblage ofmicropalaeoflora, spheroidal - algae Groups are major, and complex ornamental elements, such asLophominusula , Lophosphaeridium and Micrhystridium are discoverd. The feature of theassemblage of the above - mentioned micropalaeoflora fully shows the characteristic of the Siniansystem, China.Description of new species is as follows:Genus Micrhystridium (Deflardre, 1937) Staplin, 1961Pattern Micrhystridium inconspicum Defl., 1935Micrhystridium yunxiense sp. nov.(Pl. Ⅰ, fig.23, 24)Holotype Pl. Ⅰ, fig. 24, No. YNP1V335Description Theca circular, irregularly round in outline, with diameter of 8 - 12μm. Thereare two types of thorn on the theca surface, one is short thorn 1 - 2 μm densely covered the thecasurface, another is a clear, protrusine long thron, 8 - 10mp, being wide and thick at thron base,hollow at the middle, blunt at the end. Brown.Comparison The new species is similar to M. tornatum in having densely covered shortthron on the theca surface, but it differs from the later in having a long and protrusive thron,about 8 - 10μm.Occurrence Metasedimentary rocks Formation of Wudangshan Group, Yunxi County,Hubei.

关 键 词：微体古植物群 变沉积岩组 晨旦系 沉积岩 地层 

分 类 号：Q913.631[天文地球—古生物学与地层学] P588.2[生物学—古生物学]