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Mesoarchean Eon 3200–2800 million years ago
Mesoarchean ( , also spelled Mesoarchaean) is a geologic era within the Archean Eon, spanning . The era is defined 3,200 to 2,800 million years ago 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 . 2,900 million years ago The first  supercontinent Vaalbara broke up during this era about .
2,800 million years ago
The earliest reefs date from this era, and were probably formed by stromatolites
 . Analysis of oxygen isotopes in cherts led to an oceanic temperature estimate around 55-85º C  , while other studies of weathering rates postulate average temperatures below 50º C  . Dinitrogen content in the atmosphere is thought to have been fundamentally similar to today's, and the partial pressure of carbon dioxide was probably lower than 0.7  bar .
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