Mesoarchean

This era saw the rise of oxygen in the atmosphere after oxygenic photosynthesis evolved in cyanobacteria as early as the Mesoarchean era.

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Neoarchean

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Because the bridge feeds directly into downtown Stillwater on the Minnesota side, gridlock often occurred and traffic could back up on Minnesota State Highway 36 for many miles, especially on weekends and during the summer.

subdivision of

Archean

tags

geologic era

Wikipedia

Mesoarchean (Wikipedia) The Mesoarchean (/ˌmiːzoʊ.ɑːrˈkiːən, ˌmɛzoʊ-/ MEE-zoh-ar-KEE-ən, MEZ-oh-, also spelled Mesoarchaean) is a geologic era in the Archean Eon, spanning 3,200 to 2,800 million years ago, which contains the first evidence of modern-style plate subduction and expansion of microbial life. The era is defined chronometrically and is not referenced to a specific level in a rock section on Earth.

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Paleoarchean