ආකියානු

Archean
Archean
4000 – 2500 Ma ෆැ. ප්‍රොටෙරො. ආකියානු හේඩි.
	Artist's impression of an Archean landscape.
Chronology
−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
Etymology
Name formality	Formal
Alternate spelling(s)	Archaean, Archæan
Synonym(s)	Eozoic; J.W. Dawson, 1865;
Usage information
Celestial body	Earth
Regional usage	Global (ICS)
Time scale(s) used	ICS Time Scale
Definition
Chronological unit	Eon
Stratigraphic unit	Eonothem
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

Archean යනු භූගෝලීය කාල පරාසයේ දෙවන යුගය වේ.

ආශ්‍රිතසංස්කරණය

Wikisource has the text of the 1911 Encyclopædia Britannica article Archean System.

"Archean". GeoWhen Database. stratigraphy.org. 22 August 2010 දින මුල් පිටපත වෙතින් සංරක්ෂණය කරන ලදී. සම්ප්‍රවේශය 17 September 2010.
"When did plate tectonics begin?". utdallas.edu. University of Texas – Dallas.
"Archean (chronostratigraphy scale)". ghkclass.com.