The Neoarchean ( /ˌniː.oʊ.ɑrˈkiː.ən/; also spelled Neoarchaean) is a geologic era within the Archaean. It 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. 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. The supercontinent Kenorland formed during this period, about 2,700 million years ago.
| Archean Eon |
| Eoarchean |
Paleoarchean |
Mesoarchean |
Neoarchean |
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Geologic history of Earth
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Precambrian supereon
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Hadean
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Paleohadean
Mesohadean
Neohadean
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Archean
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Eoarchean
Paleoarchean
Mesoarchean
Neoarchean
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Proterozoic
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Paleoproterozoic : Siderian · Rhyacian · Orosirian · Statherian
Mesoproterozoic : Calymmian · Ectasian · Stenian
Neoproterozoic : Tonian · Cryogenian · Ediacaran
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Phanerozoic eon
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Paleozoic
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Cambrian
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Terreneuvian (de): Fortunian (de) · Age 2*
Epoch 2* : Age 3* · Age 4*
Epoch 3* : Age 5* · Drumian (de) · Guzhangian (de)
Furongian : Paibian · Jiangshanian (de) · Age 10*
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Ordovician
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Early Ordovician : Tremadocian · Floian
Middle Ordovician : Dapingian · Darriwilian
Late Ordovician : Sandbian · Katian · Hirnantian
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Silurian
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Llandovery : Rhuddanian · Aeronian · Telychian
Wenlock : Sheinwoodian · Homerian
Ludlow : Gorstian · Ludfordian
Pridoli
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Devonian
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Early Devonian : Lochkovian · Pragian · Emsian
Middle Devonian : Eifelian · Givetian
Late Devonian : Frasnian · Famennian
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Carboniferous
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Mississippian : Tournaisian / Early Mississippian · Viséan / Middle Mississippian · Serpukhovian / Late Mississippian
Pennsylvanian : Bashkirian / Early Pennsylvanian · Moscovian / Middle Pennsylvanian · Late Pennsylvanian : Kasimovian · Gzhelian
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Permian
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Cisuralian : Asselian · Sakmarian · Artinskian · Kungurian
Guadalupian : Roadian · Wordian · Capitanian
Lopingian : Wuchiapingian · Changhsingian
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Mesozoic
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Triassic
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Early Triassic : Induan · Olenekian
Middle Triassic : Anisian · Ladinian
Late Triassic : Carnian · Norian · Rhaetian
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Jurassic
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Early Jurassic : Hettangian · Sinemurian · Pliensbachian · Toarcian
Middle Jurassic : Aalenian · Bajocian · Bathonian · Callovian
Late Jurassic : Oxfordian · Kimmeridgian · Tithonian
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Cretaceous
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Early Cretaceous : Berriasian · Valanginian · Hauterivian · Barremian · Aptian · Albian
Late Cretaceous : Cenomanian · Turonian · Coniacian · Santonian · Campanian · Maastrichtian
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Cenozoic
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| period. Gelasian and Calabrian comprise Early Pleistocene subepoch.
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Paleogene
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Paleocene : Danian · Selandian · Thanetian
Eocene : Ypresian · Lutetian · Bartonian · Priabonian
Oligocene : Rupelian · Chattian
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Neogene
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Miocene : Aquitanian · Burdigalian · Langhian · Serravallian · Tortonian · Messinian
Pliocene : Piacenzian · Zanclean
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Quaternary
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Pleistocene : Gelasian · Calabrian · Middle Pleistocene / Ionian · Late Pleistocene / Tarantian : Oldest Dryas* · Bølling* · Older Dryas* · Allerød* · Younger Dryas*
Holocene : Preboreal* · Boreal* · Atlantic* · Subboreal* · Subatlantic*
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