天津蓟县洪水庄组微古植物群  

Micropalaeofora of the Hongshuizhuang Formation Jixian System in Jixian Tianjin

作　　者：孙淑芬[1] 

机构地区：[1]天津地质矿产研究所,天津300170

出　　处：《前寒武纪研究进展》2000年第3期165-172,共8页Progress in Precambrian Research

基　　金：国家自然科学基金资助项目! ( 4 9972 0 10 )

摘　　要：在天津蓟县洪水庄组页岩中发现微古植物共计 33属 61种 ,其中新种 2个。利用页岩磨片法获得了新的古生物信息。其微古植物组合特征可分为五大类型 :球形类约占 4 7.7%、线形类约占 19.5%、多面体类约占 16.7%、异形类约占 10 .9%、船形类约占 5.1%。该微古植物群组合面貌反映了前寒武纪微生物的分化程度和进化水平 ,提供了地球早期真核生物发生和发展的重要信息。genera 61 species of micropalaeoflora are discovered in the shale of Hongshuizhuang Formation in Jixian county, Tianjin, in which there are two new species. The new information is obtained by means of method of polished thin section to the shale. The features of the micropalaeofora, assemblage can be divided into five types as follows: the elements of sphaermorphida (47.7%), the linear ones 19.5%, the mutifaceted ones 16.7%, the allotype ones 10.9%, boat shaped ones 5.1%. The features of the micropalaeoflora assemblage show the differentiation degree and evolution level of Precambrian microbe, providing the important information on the occurrence and development of eukaryotic organisms of early Earth. Description of new species Triangumorpha Sin et Liu, 1973 Triangumorpha striata Sin et Liu, 1973 Triangumorpha hongshuizhuangensis sp.nov (Pl.Ⅰ.figs, 3,4) Holotpye pl.Ⅰ,fig,3; No.Jh27 Description Theca triangular or roundly triangular with diameter of 200～600 μm, thick and compact, surface rough, with ribs spreading along the triangular margin.theca yellowish brown.ribs dark brown in color. Comparison This species is characterized by big bodies and ribs spreading along the triangular margin, hence it differs from other species of the genus. Occurrence Hongshuizhuang Formation, Jixian county, Tianjin. Trachysphaeridium Timofeev, 1959 Trachysphaeridium attenuatum Tim.1959 Trachysphaeridim gemmatum sp.nov. (Pl.Ⅰ,figs.9,10,11) Holotype Pl.Ⅰ, fig.11,No.Jh5 Description Theca round or long oval,with one end bluntly rounded while the other end top shrinked with budding protuberance (bud body). Theca thick and compact, rough, slight transparent, diameter of 40 μm×90 μm, bud body 8 μm×30 μm, greyish brown. Comparison This species is characterized by budding bodies.differing from other species of the genus. Occurrence Hongshuizhuang Formation, Jixian,Tianjin. Pseudozonosphaera Sin et Liu, 1973 Pseudozonosphaera verrucosa Sin et Liu, 1973 Pseudozonosphaera verrucosa var.gigantea

关 键 词：微古植物群 页岩磨片 洪水庄组 蓟县 天津 化石 

分 类 号：Q913.84[天文地球—古生物学与地层学] Q911.6[生物学—古生物学]