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The Geological Timescale |
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Era |
Sub-Era |
Period |
Epoch |
Start |
"Year" |
|
|
Quaternary or |
Holocene |
0.01 |
31 Dec |
|
|
Pleistocene |
1.64 |
31 Dec |
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|
Tertiary |
Neogene |
Pliocene |
5.2 |
31 Dec |
|
|
Miocene |
23.3 |
30 Dec |
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|
Paleogene |
Oligocene |
35.4 |
29 Dec |
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|
Eocene |
56.5 |
27 Dec |
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|
Paleocene |
65.0 |
26 Dec |
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|
Cretaceous |
Gulf |
Senonian |
88.5 |
25 Dec |
|
Gallic |
131.8 |
21 Dec |
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|
K1 |
Neocomian |
145.6 |
20 Dec |
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|
Jurassic |
Malm |
157.1 |
19 Dec |
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|
Dogger |
178.0 |
17 Dec |
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|
Lias |
208.0 |
15 Dec |
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Triassic |
Tr3 |
235.0 |
13 Dec |
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|
Tr2 |
241.1 |
12 Dec |
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|
Scythian |
245.0 |
12 Dec |
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|
Permian |
Zechstein |
256.1 |
11 Dec |
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|
Rotliegendes |
290.0 |
08 Dec |
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|
Carboniferous |
Pennsylvanian |
Gzelian |
295.1 |
08 Dec |
|
|
Kasimovian |
303.0 |
07 Dec |
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|
Moscovian |
311.3 |
07 Dec |
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Bashkirian |
322.8 |
06 Dec |
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|
Mississippian |
Serpukhovian |
332.9 |
05 Dec |
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|
Visean |
349.5 |
04 Dec |
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|
Tournaisian |
362.5 |
02 Dec |
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Devonian |
Upper |
377.4 |
01 Dec |
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|
Middle |
386.0 |
01 Dec |
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|
Lower |
408.5 |
30 Nov |
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|
Silurian |
Pridoli |
410.7 |
29 Nov |
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|
Ludlow |
424.0 |
28 Nov |
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|
Wenlock |
430.4 |
27 Nov |
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|
Llandovery |
439.0 |
27 Nov |
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|
Ordovician |
Bala |
Ashgill |
443.1 |
26 Nov |
|
|
Caradoc |
463.9 |
24 Nov |
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|
Dyfed |
Llandeilo |
468.6 |
24 Nov |
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|
Llanvirn |
476.1 |
23 Nov |
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|
Canadian |
Arenig |
493.0 |
22 Nov |
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|
Tremadoc |
510.0 |
21 Nov |
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|
Cambrian |
Merioneth |
517.2 |
20 Nov |
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|
St David's |
536.0 |
19 Nov |
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|
Caerfai |
570.0 |
18 Nov |
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|
Proterozoic |
Sinian |
Vendian |
Ediacara |
590 |
14 Nov |
|
Varanger |
610 |
13 Nov |
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|
Sturtian |
825 |
27 Oct |
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|
Riphean |
Karatau |
1100 |
04 Oct |
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|
Yurmatian |
1375 |
12 Sep |
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|
Burzyan |
1675 |
19 Aug |
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|
Animikean |
2225 |
06 Jul |
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|
Huronian |
2475 |
16 Jun |
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Archaean |
Randian |
2825 |
19 May |
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|
Swazian |
3525 |
24 Mar |
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Isuan |
3875 |
24 Feb |
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Priscoan |
Hadean |
Early Imbrian |
3900 |
22 Feb |
|
|
Nectarian |
3975 |
16 Feb |
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|
Basin Groups |
4150 |
02 Feb |
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|
Cryptic |
4560 |
01 Jan |
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Sources: Harland W.B., et al., "A Geologic Time Scale 1989," Cambridge University Press: Cambridge UK, Revised Edition, 1990. Allaby A. & Allaby M., eds, "A Dictionary of Earth Sciences," [1990], Oxford University Press: Oxford UK, Second Edition, 1999. |
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