Fossil Record of Oscillatoriaceae from Cambrian Series 2 Xiaoerblaq Formation in Northwestern Tarim Basin,China
Thin section observations have revealed a large amount of filamentous cyanobacteria from the dolomite of Cambrian Series 2 Xiaoerblaq Formation in the northwestern Tarim Basin.Specifically,four species belonging to three genera of Oscillatoriaceae fossils have been identified,including Obruchevella meishucunensis,Oscillato-riopsis longa,Oscillatoriopsis sp.,and Siphonophycus typicum.These findings represent the first report of such filamentous cyanobacteria in the Xiaoerblaq Formation,and provide an exquisite preservation of their clear three-layer structure,that is,calcified mucilaginous sheath,organic tube wall,and internal black filament,augmenting the knowledge of their internal structure and identification characteristics.The discovery of Oscillatoriaceae fossils greatly increases the diversity of the Xiaoerblaq Biota and provides new materials for further study of fossils and the evolution of life in the early Cambrian.
OscillatoriaceaeXiaoerblaq FormationTarim BasinCambrian Series 2
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