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Ammonite Madagascar groot
The Precambrian is the geological period that lasted from the forming of the Earth to 541 million years ago. In sediments from the Archaeïcum stromatolite fossils have been found of cyanobacteria in marine sediments. From the Early and Middle Proterozoic (2500 to 900) colony forming bacteria (without core) are known, followed by the first known Eukaryotes (with core). From the Late Proterozoic (900 to 570) the first animals occur, like colony-forming sponges.
Position of the Precambrian in the geological timescale (not to scale)
See also the article about the Geological Timescale.
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