THE FOSSIL RECORD OF OSCILLATORIACEAE FROM THE EDIACARAN-LOWER CAMBRIAN LIUCHAPO FORMATION IN CENTRAL GUIZHOU，CHINA
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Abstract:
Abundant filamentous cyanobacteria have been discovered from the Ediacaran-Cambrian Liuchapo chert at the Yangtiao section，Majiang County，Guizhou Province． Six Oscillatoriaceae species comprising of different genera are identified，including Calyptothrix perfecta， Calyptothrix major， Megathrix longus， Obruchevella sp．，Palaeolyngbya barghoorniana， and Palaeolyn-gbya sp．．In addition，an unnamed filamentous microfossil that is morphologically similar to the modern Lyngbyais also described．Based on its unique finely annulated sheath and coarsely annulated filaments，the unnamed fossil may represent a new species belonging to the genus Lyngbya．The systematic study of the Oscilla-toriaceae adds new palaeontological data to refine the biostratigraphic framework，and improves our understanding of the diversification of the primary producers during this time period transitioning from Proterozoic to Phanerozoic．
