ආකියානු
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Archean යනු භූගෝලීය කාල පරාසයේ දෙවන යුගය වේ.
Quick Facts Archean, Chronology ...
Archean | ||||||
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4000 – 2500 Ma | ||||||
Chronology | ||||||
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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 |
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