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~3,000 Ma, Cleaverville Formation, Cleaverville Greenstone Belt, West Pilbara, Western Australia~3,000 Ma, Farrel Quartzite, East Pilbara, Western Australia; THE IMPOSTERS: Younger Biological Contaminants and Non-Biological Artefacts. When did life first appear on Earth and what form did it take? This practical guide brings together materials that have been claimed to comprise the earliest fossil record. It is suitable for an astrobiologist and astronaut.