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The Hadean aeon (from about 4.56 to 4.0Ga ago: 1Ga = 1 x 109 years) and the succeeding Archaean aeon (from about 4.0 to 2.5Ga ago) saw the start of life, and its early occupation of planet.
The Hadean aeon (from about 4.56 to 4.0Ga ago: 1Ga = 1 x 109 years) and the succeeding Archaean aeon (from about 4.0 to 2.5Ga ago) saw the start of life, and its early occupation of planet.