International Chronostratigraphic Chart - v 2026/06 - GSSP numerical age (Ma)

Sep 17, 2026

Uploaded by Mack Lee

International Chronostratigraphic Chart (v 2026/06) presents the geological time scale using GSSP and GSSA markers for lower boundaries across eons, eras, systems, and periods. The chart lists numerical ages in Ma alongside stratigraphic rankings such as Phanerozoic subdivisions (Cenozoic, Mesozoic, Paleozoic), major periods (Quaternary, Neogene, Paleogene, Jurassic, Cretaceous, Cambrian, etc.), and corresponding stage-level names. It also includes Precambrian eon divisions and summarizes that units are being defined through GSSP for global boundary section and point definitions.

LanguageEnglish

CategoryResearch & Report

FormatPDF

Pages1

Reading Time3 min

AccessFree to download

Phanerozoic time scale

Cenozoic (Quaternary, Neogene, Paleogene)

Mesozoic (Triassic, Jurassic, Cretaceous)

Paleozoic (Permian, Carboniferous, Devonian, Silurian, Ordovician, Cambrian)

Precambrian time scale

Proterozoic divisions

Archean and Hadean

INTERNATIONAL CHRONOSTRATIGRAPHIC CHART [www.stratigraphy.org](www.stratigraphy.org) International Commission on Stratigraphy v 2026/06 GSSP numerical age (Ma) numerical age (Ma) numerical age (Ma) Eonothem / Eon Erathem / Era System / Period GSSP GSSA numerical age (Ma) | Phanerozoic | Cenozoic | Quaternary | U/L | Meghalayan | | --- | --- | --- | --- | --- | | | | | Holocene M L/E | Northgrippian | | | | | | Greenlandian | | | | | U/L M

Pleistocene L/E | Upper | | | | | | Chibanian | | | | | | Calabrian
| | | | | | Gelasian | | | | Neogene | Pliocene
U/L L/E | Piacenzian | | | | | | Zanclean | | | | | Miocene
U/L
M
L/E | Messinian | | | | | |
Tortonian | | | | | | Serravallian | | | | | | Langhian | | | | | | Burdigalian | | | | | | Aquitanian | | | | Paleogene | Oligocene | Chattian
| | | | | | Rupelian | | | | | Eocene |
Priabonian | | | | | | Bartonian | | | | | | Lutetian
| | | | | | Ypresian
| | | | | Paleocene | Thanetian | | | | | | Selandian | | | | | | Danian
| | | Mesozoic | Cretaceous | Upper | Maastrichtian

| | | | | | Campanian

| | | | | | Santonian | | | | | |
Coniacian | | | | | |
Turonian | | | | | |
Cenomanian | | | | | Lower |

Albian | | | | | | Aptian | | | | | | Barremian | | | | | |
Hauterivian | | | | | | Valanginian | | | | | | Berriasian | present 0.0042 0.0082 0.0117 0.129 0.774 1.80 2.58 3.600 5.333 7.246 11.63 13.82 15.98 20.45 23.04 27.30 33.9 37.71 41.03 48.07 56.00 59.24 61.66 66.00 72.2 ±0.2 83.6 ±0.2 85.7 ±0.2 89.8 ±0.3 93.9 ±0.2 100.5 ±0.1 113.2 ±0.3 121.4 ±0.6 125.77 132.6 ±0.6 137.05 ±0.2 143.1 ±0.6 5th International Congress on Stratigraphy STRATI 2026 | Phanerozoic | Mesozoic | Jurassic | Upper | | Tithonian | | --- | --- | --- | --- | --- | --- | | | | | | | Kimmeridgian | | | | | | | Oxfordian | | | | | Middle | | Callovian | | | | | | | Bathonian | | | | | | | Bajocian | | | | | | | Aalenian | | | | | Lower | | Toarcian
| | | | | | | Pliensbachian

| | | | | | |

Sinemurian | | | | | | | Hettangian | | | | Triassic | Upper | | Rhaetian | | | | | | | Norian | | | | | | |

Carnian | | | | | Middle | | Ladinian | | | | | | | Anisian | | | | | Lower | | Olenekian | | | | | | | Induan | | | Paleozoic | Permian | Lopingian | | Changhsingian | | | | | | | Wuchiapingian | | | | | Guadalupian | | Capitanian | | | | | | | Wordian | | | | | | | Roadian | | | | | Cisuralian | | Kungurian | | | | | | | Artinskian

| | | | | | |
Sakmarian | | | | | | | Asselian | | | | Carboniferous | Pennsylvanian | Upper | Gzhelian | | | | | | | Kasimovian | | | | | | Middle | Moscovian | | | | | | Lower |
Bashkirian | | | | | Mississippian | Upper | Serpukhovian | | | | | | Middle |

Visean | | | | | | Lower | Tournaisian

| 143.1 ±0.6 149.2 ±0.7 154.8 ±0.8 161.5 ±1.0 165.3 ±1.1 168.2 ±1.2 170.9 ±0.8 174.7 ±0.8 184.2 ±0.3 192.9 ±0.3 199.5 ±0.3 201.4 ±0.2 ~ 205.7 ~ 227.3 ~ 237 241.464 ±0.28 247.0 250.8 251.902 ±0.024 254.14 ±0.07 259.857 ±0.084 264.28 ±0.16 266.9 ±0.4 274.4 ±0.4 283.3 ±0.4 290.1 ±0.26 293.52 ±0.17 298.9 ±0.15 303.7 ±0.1 307.0 ±0.1 315.2 ±0.2 323.4 ±0.4 330.3 ±0.4 346.7 ±0.4 358.86 ±0.19 | Phanerozoic | Paleozoic | Devonian | Upper |

Famennian | | --- | --- | --- | --- | --- | | | | | | Frasnian
| | | | | Middle | Givetian
| | | | | | Eifelian
| | | | | Lower | Emsian
| | | | | | Pragian | | | | | | Lochkovian

| | | | Silurian | Pridoli | | | | | | Ludlow | Ludfordian | | | |

FAQs

What information does the chart provide for each stratigraphic unit?

It provides numerical age values in Ma and associates them with stratigraphic boundary concepts using GSSP/GSSA, spanning eons to systems and periods (including stage-level names shown in the table).

How are GSSP and GSSA used in the chart?

GSSP marks lower boundaries for units that are being defined by Global Boundary Stratotype Section and Points, while GSSA refers to the standard global stratigraphic ages for certain earlier-defined divisions mentioned in the text.

What are the main time divisions covered besides the Phanerozoic?

The chart also covers Precambrian divisions, including Proterozoic subdivisions and Archean and Hadean categories, with corresponding numerical ages or ranges shown.

Sep 17, 2026

Uploaded by Mack Lee