Abundant thrombolites in the Cambrian Miaolingian Series, southern North China Craton, are categorized as Girvanella thrombolites and Epiphyton thrombolites based on the varied calcified cyanobacterial morphotypes. Girvanella thrombolites are columnar and spotted with stratiform or domal shapes macroscopically. The columnar thrombolites comprise the irregular columnar clots with many well-preserved Girvanella in upright form. The spotted thrombolites consist of irregular patchy clots, comprising plenty of tangled and intertwined Girvanella. Epiphyton thrombolites are commonly domal in shape and comprise many spotted clots or dendritic clots. Microscopic observations show that Epiphyton are spherical in the spotted clots but dispersed in dendritic clots. The morphology of the calcified cyanobacteria in different types are closely related to the hydrodynamic conditions. The microscopic features of the Girvanella, imply uniform nucleation sites, while Epiphyton, indicates heterogeneous nucleation sites. These two different distribution patterns of nucleation sites result in clotted fabrics variations of the thrombolites. Further studies on the characteristics and environments of these Cambrian thrombolites in the Henan Province, are expected to offer significant evidence for the analysis of thrombolite genesis.

华北克拉通南部寒武系苗岭系中丰富的凝块石根据钙化蓝藻的形态类型分为Girvanella凝块石和附生菌凝块石。Girvanella凝块石为柱状，肉眼观察呈层状或圆顶状斑点。柱状凝块由不规则柱状凝块和许多保存完好的直立形式的Girvanella组成。斑点血栓凝块由不规则的斑块状凝块组成，包括大量缠结和交织的Girvanella。附生菌凝块石通常呈球形，包括许多斑点凝块或树突凝块。显微观察表明，附生生物在斑点凝块中呈球形，但分散在树枝状凝块中。不同类型钙化蓝藻的形态与水动力条件密切相关。Girvanella的微观特征意味着均匀的成核位点，而Epiphyton表示异质的成核位点。成核位点的这两种不同分布模式导致血栓形成物的凝结织物变化。进一步研究河南寒武系凝块石的特征和环境，有望为凝块石成因分析提供重要依据。