Neoarchean

Neoarchean Eon 2800–2500 million years ago

The geological eras view • discuss •  -4500 — – -4000 — – -3500 — – -3000 — – -2500 — – -2000 — – -1500 — – -1000 — – -500 — – 0 — Hadean Archean Protero -zoic Phanero -zoic Eo Paleo Meso Neo Paleo Meso Neo Paleo Meso Ceno     Scale: Millions of years

The Neoarchean (/ˌniː.oʊ.ɑːrˈkiː.ən/; also spelled Neoarchaean) is a geologic era within the Archaean.

The Neoarchean spans the period of time from 2,800 to 2,500 million years ago—the period being defined chronometrically and not referenced to a specific level in a rock section on Earth.

Complex life

Oxygenic photosynthesis first evolved in this era and was accountable for the oxygen catastrophe which was to happen later in the Paleoproterozoic from a poisonous buildup of oxygen in the atmosphere, produced by these oxygen producing photoautotrophs, which evolved earlier in the Neoarchean.

Continental formation

The supercontinent Kenorland formed during this period, about 2,700 million years ago.