Eon
|
ERA
|
Periods
|
Epoch
|
Start
|
P
h
e
n
e
r
o
z
o
i
c |
Cenozoic
(65
ma to today)
|
Quaternary (1.8
ma to today)
|
Holocene (11
ka to today)
|
.0117
|
Pleistocene (2.6
ma to 11K)
|
2.58
|
|
|
5.333
|
|
23.03
|
|
|
33.90
|
|
56.00
|
|
66.00
|
|
Cretaceous (146
to 65 ma)
|
Upper
| 100.5
|
Lower
| 145.0
|
| Upper
| 163.5
|
Middle
|
174.1
|
Lower
|
201.3
|
| Upper
| 235.0
|
Middle
| 247.2
|
Lower
|
252.2
|
Paleozoic
(541
to 252 ma)
|
|
Lopingian
| 259.9
|
Guadalupian
| 272.3
|
Cisuralian
| 298.9
|
Carboniferous
(359
to 299 ma)
|
| 323.2
|
| 358.9
|
|
Upper
| 382.7
|
Middle
| 393.3
|
Lower
| 419.2
|
|
Pridoli
| 423.0
|
Ludlow
| 427.4
|
Wenlock
| 433.4
|
Llandovery
| 443.4
|
Ordovician (485
to 443 ma)
|
Upper
| 458.4
|
Middle
| 470.0
|
Lower
| 485.4
|
|
Furongian
| 497.0
|
Series
3
| 509.0
|
Series
2
| 521.0
|
Terreneuvian
| 541.0
|
P
r
o
t
e
r
o
t
z
o
i
c
|
Neoproterozoic
(1000
to 541 mya)
|
Ediacaran or
Vendian (635
to 541 ma)
|
635.0
|
Cryogenian (850
to 635 ma)
|
850.0
|
|
1000.
|
Mesoproterozoic
(1600
to 1000 mya)
|
Stenian (1200
to 1000 ma)
|
1200.
|
Ectasian (1400
to 1200 ma)
|
1400.
|
Calymmian (1600
to 1400 ma)
|
1600.
|
Paleoproterozoic
(2500
to 1600 mya)
|
Statherian (1800
to 1600 ma)
|
1800.
|
Orosirian (2050
to 1800 ma)
|
2050.
|
Rhyacian (2300
to 2050 ma)
|
2300.
|
Siderian (2500
to 2300 ma)
|
2500.
|
A
r
c
h
e
a
n
|
Neoarchean (2800
to 2500 ma)
|
2800.
|
Mesoarchean (3200
to 2800 ma)
|
3200.
|
Paleoarchean (3600
to 3200 ma)
|
3600.
|
Eoarchaean (4000
to 3600 ma)
|
4000.
|
H
a
d
e
a
n |
Lower
Imbrian (4100
to 4000 ma)
|
4100.
|
Nectarian (4300
to 4100 ma)
|
4300.
|
Basin
Groups (4500
to 4300 ma)
|
4500.
|
Cryptic (4567
to 4500 ma)
|
4567.
|