tab geochrono.pdf

ICS

INTERNATIONAL STRATIGRAPHIC CHART

International Commission on Stratigraphy

Holocene

Tithonian

145.5 ±4.0

Famennian

359.2 ±2.5

Ediacaran

542

150.8 ±4.0

0.0118

Upper

374.5 ±2.6

Neo-

proterozoic

~630

Upper

Kimmeridgian

Frasnian

Cryogenian

155.7 ±4.0

0.126

385.3 ±2.6

850

Pleistocene

Middle

Lower

Oxfordian

Givetian

Tonian

161.2 ±4.0

0.781

Middle

391.8 ±2.7

1000

Callovian

Eifelian

Stenian

164.7 ±4.0

1.806

397.5 ±2.7

Meso-

proterozoic

1200

Gelasian

Bathonian

Emsian

Ectasian

2.588

Middle

167.7 ±3.5

407.0 ±2.8

1400

Pliocene

Piacenzian

Bajocian

Lower

Pragian

Calymmian

3.600

171.6 ±3.0

411.2 ±2.8

1600

Zanclean

Aalenian

Lochkovian

Statherian

5.332

175.6 ±2.0

416.0 ±2.8

1800

Messinian

Toarcian

Orosirian

Pridoli

Paleo-

proterozoic

183.0 ±1.5

7.246

418.7 ±2.7

2050

Tortonian

Pliensbachian

Ludfordian

Rhyacian

Lower

189.6 ±1.5

Ludlow

11.608

421.3 ±2.6

2300

Serravallian

Sinemurian

Gorstian

Siderian

Miocene

13.65

196.5 ±1.0

422.9 ±2.5

2500

Langhian

Hettangian

Homerian

426.2 ±2.4

15.97

199.6 ±0.6

Wenlock

Neoarchean

Burdigalian

Rhaetian

Sheinwoodian

20.43

203.6 ±1.5

2800

428.2 ±2.3

Norian

Aquitanian

Upper

Telychian

23.03

216.5 ±2.0

436.0 ±1.9

Mesoarchean

Chattian

Carnian

Llandovery

Aeronian

28.4 ±0.1

Oligocene

228.0 ±2.0

439.0 ±1.8

3200

Rupelian

Ladinian

Rhuddanian

33.9 ±0.1

Paleoarchean

Middle

237.0 ±2.0

443.7 ±1.5

Priabonian

Anisian

Hirnantian

37.2 ±0.1

245.0 ±1.5

445.6 ±1.5

3600

Bartonian

Olenekian

Upper

Stage 6

Eoarchean

Lower limit is

not defined

Eocene

40.4 ±0.2

Lower

249.7 ±0.7

455.8 ±1.6

Lutetian

Induan

Stage 5

48.6 ±0.2

55.8 ±0.2

251.0 ±0.4

460.9 ±1.6

Ypresian

Changhsingian

Darriwilian

Lopingian

253.8 ±0.7

Middle

468.1 ±1.6

Subdivisions of the global geologic record are

formally defined by their lower boundary. Each unit

of the Phanerozoic (~542 Ma to Present) and the

base of Ediacaran are defined by a basal Global

Standard Section and Point (GSSP ), whereas

Precambrian units are formally subdivided by

absolute age (Global Standard Stratigraphic Age,

GSSA). Details of each GSSP are posted on the

ICS website ( www.stratigraphy.org ).

International chronostratigraphic units, rank,

names and formal status are approved by the

International Commission on Stratigraphy (ICS)

and ratified by the International Union of Geological

Sciences (IUGS).

Numerical ages of the unit boundaries in the

Phanerozoic are subject to revision. Some stages

within the Ordovician and Cambrian will be formally

named upon international agreement on their GSSP

limits. Most sub-Series boundaries (e.g., Middle

and Upper Aptian) are not formally defined.

Colors are according to the United States

Geological Survey (USGS).

The listed numerical ages are from 'A Geologic

Time Scale 2004', by F.M. Gradstein, J.G. Ogg,

A.G. Smith, et al. (2004; Cambridge University Press).

Thanetian

Wuchiapingian

Stage 3

58.7 ±0.2

260.4 ±0.7

471.8 ±1.6

Paleocene

Selandian

Capitanian

Stage 2

265.8 ±0.7

61.7 ±0.2

Lower

478.6 ±1.7

Danian

Wordian

Guadalupian

Tremadocian

268.0 ±0.7

65.5 ±0.3

488.3 ±1.7

Maastrichtian

Roadian

Stage 10

70.6 ±0.6

270.6 ±0.7

Campanian

Kungurian

Furongian

Stage 9

83.5 ±0.7

85.8 ±0.7

275.6 ±0.7

Santonian

Artinskian

Paibian

Upper

Cisuralian

284.4 ±0.7

501.0 ±2.0

Coniacian

Sakmarian

Stage 7

89.3 ±1.0

294.6 ±0.8

Turonian

Asselian

Series 3

Stage 6

299.0 ±0.8

93.5 ±0.8

Cenomanian

Gzhelian

Stage 5

99.6 ±0.9

Upper

303.9 ±0.9

Albian

Kasimovian

Stage 4

112.0 ±1.0

306.5 ±1.0

Series 2

Aptian

Middle

Moscovian

Stage 3

311.7 ±1.1

125.0 ±1.0

130.0 ±1.5

Barremian

Lower

Bashkirian

Lower

Series

Stage 2

Lower

318.1 ±1.3

Hauterivian

Upper

Serpukhovian

Stage 1

542.0 ±1.0

136.4 ±2.0

326.4 ±1.6

Valanginian

Middle

Visean

This chart was drafted by Gabi Ogg.

140.2 ±3.0

145.5 ±4.0

345.3 ±2.1

Berriasian

Lower

Tournaisian

359.2 ±2.5

* proposed by ICS

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