IUGS
Geologic Time Scale
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Eon |
Era |
Period |
Ended: |
Began: |
P
h
e
n
e
r
o
z
o
i
c |
Cenozoic |
Neogene |
0
Ma |
23.03
Ma |
Paleogene |
23.03
Ma |
65.5
± 0.3 Ma |
Mesozoic |
Cretaceous |
65.5
± 0.3 Ma |
145.5
± 4.0 Ma |
Jurassic |
145.5
± 4.0 Ma |
199.6
± 0.6 Ma |
Triassic |
199.6
± 0.6 Ma |
251.0
± 0.4 Ma |
Paleozoic |
Permian |
251.0
± 0.4 Ma |
299.0
± 0.8 Ma |
Carboniferous |
299.0
± 0.8 Ma |
359.2
± 2.5 Ma |
Devonian |
359.2
± 2.5 Ma |
416.0
± 2.8 Ma |
Silurian
|
416.0
± 2.8 Ma |
443.7
± 1.5 Ma |
Ordovician |
443.7
± 1.5 Ma |
488.3
± 1.7 Ma |
Cambrian |
488.3
± 1.7 Ma |
542.0
± 1.0 Ma |
P
r
o
t
e
r
o
t
z
o
i
c |
Neoproterozoic |
Ediacaran
[Vendian] |
542.0
± 1.0 Ma |
650
Ma |
Cryogenian |
650
Ma |
850
Ma |
Tonian |
850
Ma |
1000
Ma |
Mesoproterozoic |
Stenian |
1000
Ma |
1200
Ma |
Ectasian |
1200
Ma |
1400
Ma |
Calymmian
|
1400
Ma |
1600
Ma |
Paleoproterozoic |
Statherian |
1600
Ma |
1800
Ma |
Orosirian
|
1800
Ma |
2050
Ma |
Rhyacian
|
2050
Ma |
2300
Ma |
Siderian
|
2300
Ma |
2500
Ma |
A
r
c
h
e
a
n |
Neoarchean |
|
2500
Ma |
2800
Ma |
Mesoarchean |
|
2800
Ma |
3200
Ma |
Paleoarchean
|
|
3200
Ma |
3600
Ma |
Eoarchean |
|
3600
Ma |
not
defined |
H
a
d
e
a
n |
|
|
|
|
The
geological time scale is used by geologists and other scientists
to describe the timing and relationships between events that
have occurred during 4.570 billion year history of the Earth.
The table of geologic periods above complies with the dates
and nomenclature proposed by the International Commission
on Stratigraphy, and uses the standard color codes of the
United States Geological Survey. |
References:
- Remane,
J., Cita, M. B., Dercourt, J., Bouysse, P., Repetto, F. &
Faure-Muret, A., (eds.) 2002: International Stratigraphic Chart.
International Union of Geological Sciences: International Commission
on Stratigraphy, Paris, 2002
- Remane,
J., Cita, M. B., Dercourt, J., Bouysse, P., Repetto, F. &
Faure-Muret, A., (eds.) 2003: International Stratigraphic Chart.
International Union of Geological Sciences: International Commission
on Stratigraphy, Paris, 2003
- International
Commission on Stratigraphy: 2004: International Stratigraphic
Chart. International Union of Geological Sciences: International
Commission on Stratigraphy, Paris, 2004
- Andrew H. Knoll, Malcolm R. Walter, Guy M.
Narbonne, Nicholas Christie-Blick, (2004) A New Period for the
Geologic Time Scale, Science 305 (5684) 621 - 622.
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