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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 55-85 ºC, while other studies of  weathering rates postulate average temperatures below 50 ºC.  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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Marty, Bernard; Zimmermann, Laurent; Pujol, Magali; Burgess, Ray; Philippot, Pascal (4 October 2013). "Nitrogen Isotopic Composition and Density of the Archean Atmosphere". Science. 342 (6154): 101-104. arXiv: . 1405.6337 Bibcode: 2013Sci...342..101M. doi: 10.1126/science.1240971. ISSN 0036-8075. PMID 24051244.