Modified 1989 geological time scale:
| SYSTEM_PERIOD | SERIES_EPOCH | STAGE | SYMBOL | TOP | BASE |
| NEOGENE |
HOLOCENE |
N4 |
0 |
0.01 |
|
| NEOGENE |
PLEISTOCENE |
N3 |
0.01 |
2 |
|
| Upper |
(0.01) |
(0.03) |
|||
| Middle |
(0.03) |
(0.78) |
|||
| Lower |
(0.78) |
(1.81) |
|||
| NEOGENE |
PLIOCENE |
N2 |
2 |
5 |
|
| Gelasian |
(1.81) |
(2.59) |
|||
| Placenzian |
(2.59) |
(3.60) |
|||
| Zanclean |
(3.60) |
(5.33) |
|||
| NEOGENE |
MIOCENE |
N1 |
5 |
23 |
|
| Messinian |
(5.33) |
(7.25) |
|||
| Tortonian |
(7.25) |
(11.6) |
|||
| Serravalian |
(11.6) |
(13.6) |
|||
| Langhian |
(13.6) |
(16.0) |
|||
| Burdigalian |
(16.0) |
(20.4) |
|||
| Aquitanian |
(20.4) |
(23.0) |
|||
| PALEOGENE |
OLIGOCENE |
E3 |
23 |
34 |
|
| Chattian |
(23) |
(28) |
|||
| Rupelian |
(28) |
(34) |
|||
| PALEOGENE |
EOCENE |
E2 |
34 |
55 |
|
| Priabonian |
(34) |
(37) |
|||
| Bartonian |
(37) |
(40) |
|||
| Lutetian |
(40) |
(49) |
|||
| Ypresian |
(49) |
(56) |
|||
| PALEOGENE |
PALEOCENE |
E1 |
56 |
65 |
|
| Thanetian |
(56) |
(59) |
|||
| Selandian |
(59) |
(62) |
|||
| Danian |
(62) |
(65) |
|||
| CRETACEOUS |
UPPER/LATE |
K2 |
65 |
100 |
|
| Maastrichtian |
(65) |
(71) |
|||
| Campanian |
(71) |
(83) |
|||
| Santonian |
(83) |
(86) |
|||
| Coniacian |
(86) |
(89) |
|||
| Turonian |
(89) |
(94) |
|||
| Cenomanian |
(94) |
(100) |
|||
| CRETACEOUS |
LOWER/EARLY |
K1 |
100 |
146 |
|
| Albian |
(100) |
(112) |
|||
| Aptian |
(112) |
(125) |
|||
| Barremian |
(125) |
(130) |
|||
| Hauterivian |
(130) |
(136) |
|||
| Valanginian |
(136) |
(140) |
|||
| Berriasian |
(140) |
(146) |
|||
| JURASSIC |
UPPER/LATE |
J3 |
146 |
161 |
|
| Tithonian |
(146) |
(151) |
|||
| Kimmeridgian |
(151) |
(155) |
|||
| Oxfordian |
(155) |
(161) |
|||
| JURASSIC |
MIDDLE |
J2 |
161 |
176 |
|
| Callovian |
(161) |
(165) |
|||
| Bathonian |
(165) |
(168) |
|||
| Bajocian |
(168) |
(172) |
|||
| Aalenian |
(172) |
(176) |
|||
| JURASSIC |
LOWER/EARLY |
J1 |
176 |
200 |
|
| Toarcian |
(176) |
(183) |
|||
| Pliensbachian |
(183) |
(190) |
|||
| Sinemurian |
(190) |
(196) |
|||
| Hettangian |
(196) |
(200) |
|||
| TRIASSIC |
UPPER/LATE |
T3 |
200 |
228 |
|
| Rhaetian |
(200) |
(204) |
|||
| Norian |
(204) |
(217) |
|||
| Carnian |
(217) |
(228) |
|||
| TRIASSIC |
MIDDLE |
T2 |
228 |
245 |
|
| Ladinian |
(228) |
(237) |
|||
| Anisian |
(237) |
(245) |
|||
| TRIASSIC |
LOWER/EARLY |
T1 |
245 |
251 |
|
| Olenekian |
(245) |
(250) |
|||
| Induan |
(250) |
(251) |
|||
| PERMIAN |
LOPINGIAN |
P3 |
251 |
260 |
|
| Changhsingian |
(251) |
(254) |
|||
| Wuchiapingian |
(254) |
(260) |
|||
| PERMIAN |
GUADALUPIAN |
P2 |
260 |
271 |
|
| Capitanian |
(260) |
(266) |
|||
| Wordian |
(266) |
(268) |
|||
| Roadian |
(268) |
(271) |
|||
| PERMIAN |
CISURALIAN |
P1 |
271 |
299 |
|
| Kungurian |
(271) |
(276) |
|||
| Artinskian |
(276) |
(284) |
|||
| Sakmarian |
(284) |
(295) |
|||
| Asselian |
(295) |
(299) |
|||
| CARBONIFEROUS |
PENNSYLVANIAN |
C2 |
299 |
318 |
|
| Gzhelain |
(299) |
(304) |
|||
| Kasimovian |
(304) |
(307) |
|||
| Moscovian |
(307) |
(312) |
|||
| Bashkirian |
(312) |
(318) |
|||
| CARBONIFEROUS |
MISSISSIPPIAN |
C1 |
318 |
359 |
|
| Serpukhovian |
(318) |
(326) |
|||
| Visean |
(326) |
(345) |
|||
| Tournasian |
(345) |
(359) |
|||
| DEVONIAN |
UPPER/LATE |
D3 |
359 |
385 |
|
| Famennian |
(359) |
(375) |
|||
| Frasnian |
(375) |
(385) |
|||
| DEVONIAN |
MIDDLE |
D2 |
385 |
398 |
|
| Givetian |
(385) |
(392) |
|||
| Eifilian |
(392) |
(398) |
|||
| DEVONIAN |
LOWER/EARLY |
D1 |
398 |
416 |
|
| Emsian |
(398) |
(407) |
|||
| Pragian |
(407) |
(411) |
|||
| Lochkovian |
(411) |
(416) |
|||
| SILURIAN |
PRIDOLI |
S4 |
416 |
419 |
|
| SILURIAN |
LUDLOW |
S3 |
419 |
423 |
|
| Ludfordian |
(419) |
(421) |
|||
| Gorstian |
(421) |
(423) |
|||
| SILURIAN |
WENLOCK |
S2 |
423 |
428 |
|
| Homerian |
(423) |
(426) |
|||
| Sheinwoodian |
(426) |
(428) |
|||
| SILURIAN |
LLANDOVERY |
S1 |
428 |
444 |
|
| Telychian |
(428) |
(436) |
|||
| Aeronian |
(436) |
(439) |
|||
| Rhuddanian |
(439) |
(444) |
|||
| ORDOVICIAN |
UPPER/LATE |
O3 |
444 |
461 |
|
| (444) |
(450) |
||||
| (450) |
(461) |
||||
| ORDOVICIAN |
MIDDLE |
O2 |
461 |
472 |
|
| Darriwilian |
(461) |
(468) |
|||
| (468) |
(472) |
||||
| ORDOVICIAN |
LOWER/EARLY |
O1 |
472 |
488 |
|
| (472) |
(479) |
||||
| Tremadocian |
(479) |
(488) |
|||
| CAMBRIAN |
FURONGIAN |
CB3 |
488 |
501 |
|
| (488) |
(?) |
||||
| Paibian |
(?) |
(501) |
|||
| CAMBRIAN |
MIDDLE |
CB2 |
501 |
513 |
|
| CAMBRIAN |
LOWER/EARLY |
CB1 |
513 |
542 |
|
| NEOPROTEROZOIC |
EDIACARAN |
NP3 |
542 |
600 |
|
| NEOPROTEROZOIC |
CRYOGENIAN |
NP2 |
600 |
850 |
|
| NEOPROTEROZOIC |
TONIAN |
NP1 |
850 |
1000 |
|
| MESOPROTEROZOIC |
MP |
1000 |
1600 |
||
| PALEOPROTEROZOIC |
PP |
1600 |
2500 |
||
| NEOARCHEAN |
NA |
2500 |
2800 |
||
| MESOARCHEAN |
MA |
2800 |
3200 |
||
| PALEOARCHEAN |
PA |
3200 |
3600 |
||
| EOARCHEAN |
EA |
3600 |
4500 |