Fossilised bacteria. Coloured Scanning Electron Micrograph (SEM) of fossilised bacteria which may be amongst the oldest evidence of life on earth. These rod-shaped cells (red) are about 0.6 to 2 micrometers in length. They were discovered in one of the oldest rock samples in the world, which are claimed to be about 3.5 billion years old. It is part of a collection of bacterial fossils discovered by sedimentologist Frances Westall. She has found such fossils in rock samples from areas such as South Africa, the Antarctic and Europe. Discovered in the High Veld rock system, Barberton, South Africa. Magnification: x1000 at 35mm size.
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