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FIGURE 4. Filamentous microfossils of the Neoproterozoic (≈850-million-year-old) Bitter Springs chert of central Australia. Because the petrified microbes are three-dimensional and sinuous, composite photos have been used to show the specimens A–G, I, K, and L. (A, F, I, and L) Cephalophytarion. (B) Helioconema. (C and G) Oscillatoriopsis. (D) Unnamed cyanobacterium. (E) Obconicophycus. (H) Filiconstrictosus. (J) Siphonophycus. (K) Halythrix.



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