通过扫描电镜分析 ,在陕西宁强早志留世深缓坡微晶灰泥丘中发现 3种微生物化石 ,分别为 :( 1 )表面光滑卵球体 ,其大小为 5μm× 3μm ,壳体表面光滑 ,长轴端具有圆形凹坑或凸起 ,可能为芽体及芽痕 ;此类化石能与真菌类菌孢对比 ;( 2 )表面粗糙的椭球体 ,其大小为 60 μm× 50 μm ,壳体表面粗糙 ,具蠕虫状断续条纹 ,并有方解石胶结物生长 ;( 3)网格状结构 ,由钙化的胶质席状物及枝状物组成 ,网呈枝状分叉 ,盖覆于灰泥之上并参加造岩。经能谱分析 ,所有微生物化石均由碳酸钙组成 ,他们在灰泥丘的形成过程中起了重要的造岩作用 By scanning electron microscopy, three kinds of microbial fossils were found in the micrite glacier of the Early Silurian in Ningqiang, Shaanxi Province. They are: (1) smooth-surface ovoid, the size of which is 5μm × 3μm, the surface of the shell is smooth and long Circular pits or protrusions at the shaft end, which may be buds and shoots; these fossils can be compared with fungal spores; (2) Rough surface ellipsoids with a size of 60 μm × 50 μm, with shell Surface roughness, with worm-like intermittent stripes, and calcite cement growth; (3) grid-like structure, composed of calcified sizing and dendrites, mesh dendritic branch, covered in gray Above the mud and participate in rock making. By energy spectrum analysis, all microbial fossils are composed of calcium carbonate, and they play an important role in granite mound formation