Neoarchean

Neoarchean
	2800 – 2500 Ma Pha. Proterozoic Archean Had'n
Chronology
	Geologic time scale -4500 — – -4000 — – -3500 — – -3000 — – -2500 — – -2000 — – -1500 — – -1000 — – -500 — – 0 — P ; r ; e ; c ; a ; m ; b ; r ; i ; a ; n Hadean A ; r ; c ; h ; e ; a ; n P ; r ; o ; t ; e ; r ; o ; z ; o ; i ; c P ; h ; a ; n Eo Paleo Meso Neo Paleo Meso Neo Paleozoic Mesozoic Cenozoic Scale: millions of years
Proposed redefinition(s)	2780–2420 Ma; Gradstein et al., 2012;
Proposed subdivisions	Methanian Period, 2780–2630 Ma; Gradstein et al., 2012; Siderian Period, 2630–2420; Gradstein et al., 2012;
Etymology
Name formality	Formal
Alternate spelling(s)	Neoarchaean
Usage information
Celestial body	Earth
Regional usage	Global (ICS)
Time scale(s) used	ICS Time Scale
Definition
Chronological unit	Era
Stratigraphic unit	Erathem
Time span formality	Formal
Lower boundary definition	Defined Chronometrically
Lower boundary GSSP	N/A
GSSP ratified	N/A
Upper boundary definition	Defined Chronometrically
Upper boundary GSSP	N/A
GSSP ratified	N/A

The Neoarchean (/ˌniːoʊɑːrˈkiːən/; also spelled Neoarchaean) is a geologic era within the Archaean Eon.

The Neoarchean spans the period 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

During this era, oxygenic photosynthesis first evolved, releasing an abundance of oxygen, that first reacted with minerals and afterward was free to react with greenhouse gases of the atmosphere, leaving the Earth's surface free to radiate its energy to space. This is known as the oxygen catastrophe which was to happen later in the Paleoproterozoic from a poisonous buildup of oxygen in the atmosphere, released by these oxygen-producing photoautotrophs, which evolved earlier in the Neoarchean.

Continental formation

During this era, the supercontinent Kenorland formed at about 2,720 million years ago.[1]^:316

References

Bozhko, N. A. (2011). "On Two Types of Supercontinental Cyclicity". Moscow University Geology Bulletin. 66: 313–322.

External links

Neoarchean (chronostratigraphy scale)

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[Bozhko2011-1] Bozhko, N. A. (2011). "On Two Types of Supercontinental Cyclicity". Moscow University Geology Bulletin. 66: 313–322.