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苏皖北部新元古代海相泥页岩、粉砂岩及燧石中富含微生物化石。其中 ,通过化学浸解法 ,从碎屑岩中获得14个形态属种的微生物化石 ;6个形态属种的蓝细菌化石呈三维立体状态保存在燧石切片中。浸解获得的泥页岩、粉砂岩相微生物化石 ,在刘老碑组中—上部的主要是片形和球形 :L aminarites antiquis-simus,L eiosphaeridia pelucida,Spumiosa alara及 Asperatopsophosphaera bavlinensis;在九里桥组、贾园组和赵圩组主要为多面形和球形 :Monilinema quadratucella及 Synsphaeridium sp.;而史家组、金山寨组和沟后组则有丰富的球形、片形、梭形和带形个体 :L eiosphaeridia hyperboreica,Trachysphaeridium simplex,Annulum difuminatum,N ucellosphaeridium asperatum,Tophoporata sp.,Symplassosphaeridium sp.,Macroptycha uniplicata及 Taenia-tum simplex。该微生物组合可与河北及天津蓟县的新元古界景儿峪组和下马岭组的相对比。虽然上述微生物化石的系统古生物学仍在研究中 ,但却为我们了解新元古代大冰期前夕近岸海相环境生物圈提供了有关浮游植物的信息。苏皖北部新元古代倪园组及九顶山组的燧石中 ,保存良好的微生物三维立体化石为丝形和球形蓝细菌遗留物 ,包括 Siphonophycus sp.,Eoentophysalis
Neoproterozoic marine shale, siltstone and chert in northern Jiangsu and northern Anhui are rich in microbial fossils. Among them, fourteen morphological microbial fossils were obtained from clastic rocks by chemical immersion method. Six species of cyanobacteria were preserved in chert slices in three-dimensional state. The shale and siltstone microbial fossils obtained by dipping are mainly in the shape of flakes and spheres in the Liu Laoti Formation: L aminarites antiquis-simus, Leiosphaeridia pelucida, Spumiosa alara and Asperatopsophosphaera bavlinensis; , Jiayuan Formation and Zhaowei Formation are mainly polyhedral and spherical: Monilinema quadratucella and Synsphaeridium sp .; while the Shijiazhuang, Jinshandai and Gouxian groups are rich in spherical, flaky, fusiform and banded individuals: L eiosphaeridia hyperboreica, Trachysphaeridium simplex, Annulum difuminatum, N ucellosphaeridium asperatum, Tophoporata sp., Symplassosphaeridium sp., Macroptycha uniplicata and Taenia-tum simplex. The microbial combination can be compared with the Neoproterozoic Jingdeyu Formation and Xiamaling Formation in Hebei and Tianjin. Although the systematic paleontology of the above microbial fossils is still under study, it provides information on phytoplankton for our understanding of the coastal marine biosphere near the Neoproterozoic Ice Age. Well-preserved microbial three-dimensional fossils from the Neoproterozoic Niyuan Formation and the Jiudingshan Formation in Northern Jiangsu, northern Anhui, are filamentous and globular cyanobacterial remnants, including Siphonophycus sp., Eoentophysalis