3200–2800 million years ago
The Mesoarchean (//, also spelled Mesoarchaean) is a geologic era within the Archean, spanning . 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 . The first supercontinent Vaalbara broke up during this time around .
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