| Timescale | ||
| Paleozoic Era | Paleozoic Timescale |
| Neoproterozoic | Proterozoic | Phanerozoic | ||
| Mesozoic | Cambrian | Timescale |
| Period | Epoch | Age | end - began (Mya) |
|---|---|---|---|
| Permian P | Lopingian P3 | Changhsingian or Changxingian) p9 | 254 - 251 |
| Wuchiapingian p8 | 260 - 254 | ||
| Guadalupian P2 | Capitanian p7 | 266 - 260 | |
| Wordian p6 | 268 - 266 | ||
| Roadian p5 | 271 - 268 | ||
| Cisuralian P1 | Kungurian p4 | 276 - 271 | |
| Artinskian p3 | 284 - 276 | ||
| Sakmarian p2 | 295 - 284 | ||
| Asselian p1 | 299 - 295 | ||
| Carboniferous C | Pennsylvanian C2 | Gzhelian c7 | 304 - 299 |
| Kasimovian c6 | 307 - 304 | ||
| Moscovian c5 | 312 - 307 | ||
| Bashkirian c4 | 318 - 312 | ||
| Mississippian C1 | Serpukhovian c3 | 327 - 318 | |
| Viséan c2 | 345 - 326 | ||
| Tournaisian c1 | 359 - 345 | ||
| Devonian D | Late Devonian D3 | Famennian d7 | 375 - 359 |
| Frasnian d6 | 385 - 375 | ||
| Middle Devonian D2 | Givetian d5 | 392 - 385 | |
| Eifelian d4 | 398 - 392 | ||
| Lower/early D1 | Emsian d3 | 407 - 398 | |
| Praghian d2 | 411 - 407 | ||
| Lochkovian d1 | 416 - 411 | ||
| Silurian S | Pridoli S4 | s8 | 419 - 416 |
| Ludlow S3 | Ludfordian s7 | 421 - 419 | |
| Gorstian s6 | 423 - 421 | ||
| Wenlock S2 | Homerian s5 | 426 - 423 | |
| Sheinwoodian s4 | 428 - 426 | ||
| Llandovery S1 | Telychian s3 | 436 - 428 | |
| Aeronian s2 | 439 - 436 | ||
| Rhuddanian s1 | 444 - 439 | ||
| Ordovician O | Late Ordovician O3 | Hirnantian | 446 - 444 |
| Ordovician VI | 456 - 446 | ||
| Sandbian | 461 - 456 | ||
| Middle Ordovician O2 | Darriwilian | 468 - 461 | |
| Ordovician III | 472 - 468 | ||
| Early Ordovician O1 | Floian | 479 - 472 | |
| Tremadoc | 488 - 479 | ||
| Cambrian Є | Late Cambrian Є3 | ["Dolgellian"] | 493 - 488 |
| Paiban | 501 - 493 | ||
| Middle Cambrian Є2 | ["Menevian"] | - 501 | |
| ["Amgan"] | 513 - | ||
| Early Cambrian Є1 | 520 - 545 |
| Era | Sub-Era | Period | Epoch | Age | when began (mya) |
|---|---|---|---|---|---|
| Mesozoic | Triassic | Scythian | Griesbachian | 245.0 | |
| Palaeozoic | Permian | Zechstein | Changxingian |
247.5 | |
| Longtanian | 250.0 | ||||
| Capitanian | 252.5 | ||||
| Wordian | 255.0 | ||||
| Ufimian | 256.1 | ||||
| Rotliegendes | Kungurian | 259.7 | |||
| Artinskian | 268.8 | ||||
| Sakmarian | 281.5 | ||||
| Asselian | 290.0 | ||||
| Carboniferous | Pennsylvanian | Gzhelian | Noginskian | 293.6 | |
| Klazminskian | 295.1 | ||||
| Kasimovian | Dorogomilovskian | 298.3 | |||
| Chamovnicheskian | 299.9 | ||||
| Krevyakinskian | 303.0 | ||||
| Moscovian | Myachkovskian | 305.0 | |||
| Podolskian | 307.1 | ||||
| Kashirskian | 309.2 | ||||
| Vereiskian | 311.3 | ||||
| Bashkirian | Melekesskian | 313.4 | |||
| Cheremshanskian | 318.3 | ||||
| Yeadonian | 320.6 | ||||
| Marsdenian | 321.5 | ||||
| Kinderscoutian | 322.8 | ||||
| Mississippian | Serpukhovian | Alportian | 325.6 | ||
| Chokierian | 328.3 | ||||
| Arnsbergian | 331.1 | ||||
| Pendleian | 332.9 | ||||
| Viséan | Brigantian | 336.0 | |||
| Asbian | 339.4 | ||||
| Holkerian | 342.8 | ||||
| Arundian | 345.0 | ||||
| Chadian | 349.5 | ||||
| Tournaisian | Ivorian | 353.8 | |||
| Hastarian | 362.5 | ||||
| Devonian | Upper | Famennian | 367.0 | ||
| Frasnian | 377.4 | ||||
| Middle | Givetian | 380.8 | |||
| Eifelian | 386.0 | ||||
| Lower | Emsian | 390.4 | |||
| Pragian | 396.3 | ||||
| Lochkovian | 408.5 | ||||
| Silurian | Pridoli | 410.7 | |||
| Ludlow | Ludfordian | 415.1 | |||
| Gorstian | 424.0 | ||||
| Wenlock | Gleedonian | 425.4 | |||
| Whitwellian | 426.1 | ||||
| Sheinwoodian | 430.4 | ||||
| Llandovery | Telychian | 432.6 | |||
| Aeronian | 436.9 | ||||
| Rhuddanian | 439.0 | ||||
| Ordovician | Bala | Hirnantian | Hirnantian | 439.5 | |
| Rawtheyan | 440.1 | ||||
| Cautleyan | 440.6 | ||||
| Pusgillian | 443.1 | ||||
| Caradoc | Onnian | 444.0 | |||
| Actonian | 444.5 | ||||
| Marshbrookian | 447.1 | ||||
| Longvillian | 449.7 | ||||
| Soudleyan | 457.5 | ||||
| Harnagian | 462.3 | ||||
| Costonian | 463.9 | ||||
| Dyfed | Llandeilo | Late | 465.4 | ||
| Mid | 467.0 | ||||
| Early | 468.6 | ||||
| Llanvirn | Late | 472.7 | |||
| Early | 476.1 | ||||
| Canadian | Arenig | 493.0 | |||
| Tremadoc | 510.0 | ||||
| Cambrian | Merioneth | Dolgellian | 514.1 | ||
| Maentwrogian | 517.2 | ||||
| St David's | Menevian | 530.2 | |||
| Solvan | 536.0 | ||||
| Caerfai | Lenian | 553.7 | |||
| Atdabanian | 560.0 | ||||
| Tommotian | 570.0 | ||||
| Precambrian | Sinian | Ediacaran | Ediacara | Poundian | 580 |
Acknowledgments:
Harland et al table modified from Stephen E. Jones, The Geological Timescale
ISC html table by Oscar van Vlijmen, Geologische tijdperken (slightly modified)
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.
International Stratigraphic Chart, International Union of Geological Sciences: International Commission on Stratigraphy, 2001, published by Micropress