The Mesoarchean (play /ˌmz.ɑrˈk.ən/, also spelled Mesoarchaean) is a geologic era within the Archean, spanning 3200 Ma to 2800 Ma (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 occcured at 2.9 Ga.[1] The first supercontinent Vaalbara broke up during this time around 2.8 Ga.


  1. ^ Robert E. Kopp, Joseph L. Kirschvink, Isaac A. Hilburn, and Cody Z. Nash (2005). "The Paleoproterozoic snowball Earth: A climate disaster triggered by the evolution of oxygenic photosynthesis". Proc. Natl. Acad. Sci. U.S.A. 102 (32): 11131–6. doi:10.1073/pnas.0504878102. PMC 1183582. PMID 16061801. 
Archean Eon
Eoarchean Paleoarchean Mesoarchean Neoarchean