Geological Time

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Science Section
 

 

Chart of Geological Time

Eons, Eras, Periods & Epochs

 

 

 

 

 



Colors and times adhere to those of the International Union of
Geological Sciences (IUGS) Geological Timescale (ma = millions of years ago
)

 

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
Neogene (23 to 1.8 ya)

Pliocene (5.3 to 2.6 ma)

5.333

Miocene (23 to 5 ma)

23.03
Paleogene (65 to 23 mya)

Oligocene (34 to 23 ma)

33.90

Eocene (56 to 34 ma)

56.00

Paleocene (66 to 56 ma)

66.00

Mesozoic

(245 to 65 ma)

Cretaceous (146 to 65 ma)

Upper

100.5
Lower
145.0
Jurassic (208 to 146 ma)
Upper
163.5
Middle
174.1
Lower
201.3
Triassic (252 to 201 ma)
Upper
235.0
Middle
247.2
Lower

252.2

Paleozoic

(541 to 252 ma)

Permian (299 to 252 ma)
Lopingian
259.9
Guadalupian
272.3
Cisuralian
298.9
Carboniferous
(359 to 299 ma)
Pennsylvanian
323.2
Mississippian
358.9
Devonian (419 to 359 ma)
Upper
382.7
Middle
393.3
Lower
419.2
Silurian (443 to 419 ma)
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
Cambrian (541 to 485 ma)
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

Tonian (1000 to 850 ma)

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.