3200–2800 million years ago
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The Mesoarchean (//, also spelled Mesoarchaean) is a geologic era within the Archean Eon, spanning . The era is defined chronometrically and is not referenced to a specific level in a rock section on Earth. Fossils from Australia show that stromatolites have grown on Earth since the Mesoarchean. The Pongola glaciation occurred around . The first supercontinent Vaalbara broke up during this era about .
The earliest reefs date from this era, and were probably formed by stromatolites. The surface temperature during the Mesoarchean was likely not much higher than modern-day temperatures. Atmospheric carbon dioxide concentration was only a few times higher than its pre-industrial value, and the Sun's luminosity was only 70% of its current value, cancelling out the influence of a greater degree of greenhouse effect that may be operating.
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