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INTERNATIONAL CHRONOSTRATIGRAPHIC CHART
www.stratigraphy.org
/ Eon System / Era / Period / Eon System / Era / Period / Eon System / Era / Period

International Commission on Stratigraphy August 2012
Eonothem Erathem

Eonothem

Eonothem

Erathem

Erathem

GSSP

GSSP

Series / Epoch

Stage / Age

numerical age (Ma)
present

GSSP

Series / Epoch

Stage / Age

numerical age (Ma)
145.0 ± 0.8

Series / Epoch

Stage / Age

numerical age (Ma)
358.9 ± 0.4

Eonothem / Eon Erathem / Era System / Period

GSSP GSSA

numerical age (Ma)
~ 541

Quaternary

Holocene Pleistocene Upper Middle Calabrian Gelasian Piacenzian Zanclean Messinian Tortonian Miocene Serravallian Langhian Burdigalian Aquitanian Chattian Oligocene Rupelian

0.0117 0.126 0.781 1.806

Tithonian Upper Kimmeridgian Oxfordian Callovian Bathonian Bajocian Aalenian Toarcian

Ediacaran Neoproterozoic Cryogenian Tonian

152.1 ±0.9 157.3 ±1.0

Famennian Upper
372.2 ±1.6

~ 635 850 1000

Devonian

Jurassic

Pliocene

Middle

5.333 7.246

Middle

Givetian Eifelian Emsian

Proterozoic

2.588 3.600

163.5 166.1 168.3 170.3

±1.0 ±1.2 ±1.3 ±1.4

Frasnian
382.7 ±1.6 387.7 ±0.8 393.3 ±1.2

Stenian Mesoproterozoic
1200

Cenozoic Neogene

174.1 ±1.0 182.7 ±0.7

Ectasian
1400

Calymmian
1600

Mesozoic

11.62 13.82 15.97 20.44 23.03

Lower

Pliensbachian
190.8 ±1.0

Lower

Precambrian

Sinemurian Hettangian Rhaetian
199.3 ±0.3 201.3 ±0.2

Pragian Lochkovian

407.6 ±2.6 410.8 ±2.8 419.2 ±3.2

Statherian
1800

Pridoli
~ 208.5

Paleoproterozoic

Orosirian
2050

Rhyacian
2300

Triassic

28.1 33.9

Upper

Norian
~ 228

Silurian

Ludlow Wenlock Llandovery

Paleogene

Priabonian Bartonian Eocene Lutetian

Phanerozoic

Phanerozoic

Phanerozoic Paleozoic Ordovician

Middle Lower Lopingian

Ladinian Anisian Olenekian Induan Changhsingian Wuchiapingian Capitanian Wordian Roadian Kungurian

~ 242 247.2 251.2 252.2 ±0.5 254.2 ±0.1 259.9 ±0.4 265.1 ±0.4 268.8 ±0.5 272.3 ±0.5 279.3 ±0.6 290.1 ±0.1

Archean

38.0 41.3 47.8

Carnian

~ 235

Ludfordian Gorstian Homerian Sheinwoodian Telychian Aeronian Rhuddanian Hirnantian Katian

423.0 425.6 427.4 430.5 433.4 438.5 440.8 443.4 445.2

±2.3 ±0.9 ±0.5 ±0.7 ±0.8 ±1.1 ±1.2 ±1.5 ±1.4

Siderian Neoarchean Mesoarchean
3200 2500 2800

Ypresian Paleocene Thanetian Selandian Danian Maastrichtian
72.1 ±0.2 56.0 59.2 61.6 66.0

Upper

Paleoarchean
3600

453.0 ±0.7

Sandbian Middle Darriwilian Dapingian Lower Floian

458.4 ±0.9 467.3 ±1.1 470.0 ±1.4 477.7 ±1.4

Eoarchean
4000

Permian

Guadalupian

Hadean
~ 4600 Units of all ranks are in the process of being defined by Global Boundary Stratotype Section and Points (GSSP) for their lower boundaries, including those of the Archean and Proterozoic, long defined by Global Standard Stratigraphic Ages (GSSA). Charts and detailed information on ratified GSSPs are available at the website http://www.stratigraphy.org Numerical ages are subject to revision and do not define units in the Phanerozoic and the Ediacaran; only GSSPs do. For boundaries in the Phanerozoic without ratified GSSPs or without constrained numerical ages, an approximate numerical age (~) is provided. Numerical ages for all systems except Triassic, Cretaceous and Precambrian are taken from `A Geologic Time Scale 2012' by Gradstein et al. (2012); those for the Triassic and Cretaceous were provided by the relevant ICS subcommissions.
Coloring follows the Commission for the Geological Map of the World. http://www.ccgm.org Chart drafted by K.M. Cohen, S. Finney, P.L. Gibbard (c) International Commission on Stratigraphy, August 2012

Campanian Upper Santonian Coniacian Turonian Cenomanian Albian
~ 113.0 83.6 ±0.2 86.3 ±0.5

Tremadocian
485.4 ±1.9

Cisuralian

Artinskian Sakmarian
295.5 ±0.4 298.9 ±0.2

Stage 10

Paleozoic

89.8 ±0.3 93.9 100.5

Furongian

Mesozoic Cretaceous

Mississippian Pennsylvanian

Upper Middle Lower Upper Middle Lower

Carboniferous

Cambrian

Asselian Gzhelian Kasimovian Moscovian Bashkirian Serpukhovian Visean

303.7 ±0.1 307.0 ±0.1 315.2 ±0.2 323.2 ±0.4 330.9 ±0.2

Jiangshanian Paibian Guzhangian Drumian
Stage 5 Stage 4

~ 489.5 ~ 494 ~ 497 ~ 500.5 ~ 504.5 ~ 509 ~ 514

Series 3

Aptian
~ 125.0

Series 2

Lower

Barremian Hauterivian Valanginian Berriasian

Stage 3
~ 521

~ 129.4 ~ 132.9 ~ 139.8 ~ 145.0

Stage 2
346.7 ±0.4

Terreneuvian Fortunian

~ 529

Tournaisian
358.9 ±0.4

541.0 ±1.0