ආකියානු

Archean යනු භූගෝලීය කාල පරාසයේ දෙවන යුගය වේ.

Archean

4000 – 2500 Ma

ෆැ.

ප්‍රොටෙරො.

ආකියානු

හේඩි.

Artist's impression of an Archean landscape.

Chronology

−4500 —

–

—

–

−4000 —

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–

−3500 —

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–

−3000 —

–

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–

−2500 —

–

—

–

−2000 —

–

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–

−1500 —

–

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–

−1000 —

–

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–

−500 —

–

—

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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

ආශ්‍රිත

Abiogenesis
Cosmic Calendar
Earliest known life forms
Geologic time scale
History of Earth
Precambrian – informal supereon on the geological timescale, spanning from Earth's formation to the Cambrian Period
Timeline of natural history
Archean felsic volcanic rocks

ආකියානු

ආශ්‍රිත

පාදසටහන්

මූලාශ්‍ර