The Mesoarchean (, also spelled Mesoarchaean) is a geologic era within the Archean, spanning 3,200 to 2,800 million years ago. The period is defined chronometrically and is not referenced to a specific level in a rock section on Earth. Fossils from Australia show that stromatolites have lived on Earth since the Mesoarchean. The Pongola glaciation occurred at 2,900 million years ago.[1] The first supercontinent Vaalbara broke up during this time around 2,800 million years ago.
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