User:ThaddeusB/Geological periods
- Carboniferous = 359 to 299 Ma
- Cambrian = 542 to 488 Ma
- Devonian = 416 to 359 Ma
- Jurassic = 199 to 145 Ma
- Cretaceous = 145 to 99 Ma
- Ordovician = 488 to 443 Ma
- Permian = 299 to 251 Ma
- Silurian = 443 to 416 Ma
- Triassic = 251 to 199 Ma
- Vendian = 650 to 540 Ma
- Bashkirian = 318 to 312 Ma
- Serpukhovian = 328 to 318 Ma
- Tournaisian = 359 to 345 Ma
- Atdabanian = 521 to 517 Ma
- Dresbachian = 501 to 497 Ma
- Toyonian = 518 to 513 Ma
- Trempealeauan = 501 to 490 Ma
- Emsian = 407 to 398 Ma
- Frasnian = 385 to 375 Ma
- Givetian = 386 to 392 Ma
- Bajocian = 171 to 167 Ma
- Callovian = 164 to 161 Ma
- Kimmeridgian = 155 to 150 Ma
- Pliensbachian = 189 to 183 Ma
- Tithonian = 150 to 145 Ma
- Albian = 112 to 99 Ma
- Barremian = 130 to 125 Ma
- Campanian = 83 to 70 Ma
- Coniacian = 89 to 85 Ma
- Maastrichtian = 70 to 65 Ma
- Turonian = 93 to 89 Ma
- Arenig = 478 to 471 Ma
- Caradoc = 460 to 449 Ma
- Llanvirn = 471 to 464 Ma
- Asselian = 299 to 294 Ma
- Leonardian = 280 to 270 Ma
- Pleistocene = 2.5 to .01 Ma
- Ludlovian = 422 to 418 Ma
- Wenlockian = 428 to 422 Ma
- Eocene = 55 to 33 Ma
- Miocene = 23 to 5 Ma
- Pliocene = 5 to 2.5 Ma
- Anisian = 245 to 237 Ma
- Induan = 251 to 249 Ma
- Norian = 216 to 203 Ma
- Nemakit-Daldynian = 542 to 534 Ma
- Moscovian = 311 to 306 Ma
- Stephanian = 306 to 299 Ma
- Visean = 345 to 326 Ma
- Botomian = 524 to 518 Ma
- Franconian = 497 to 492 Ma
- Tommotian = 534 to 530 Ma
- Eifelian = 397 to 391 Ma
- Famennian = 374 to 359 Ma
- Gedinnian = 408 to 396 Ma
- Siegenian = 411 to 407 Ma
- Bathonian = 167 to 164 Ma
- Hettangian = 199 to 196 Ma
- Oxfordian = 161 to 155 Ma
- Sinemurian = 196 to 189 Ma
- Toarcian = 183 to 175 Ma
- Aptian = 125 to 112 Ma
- Berriasian = 145 to 140 Ma
- Cenomanian = 99 to 93 Ma
- Hauterivian = 136 to 130 Ma
- Santonian = 85 to 83 Ma
- Valanginian = 140 to 136 Ma
- Ashgill = 449 to 443 Ma
- Llandeilo = 464 to 460 Ma
- Tremadoc = 488 to 478 Ma
- Guadelupian = 271 to 260 Ma
- Sakmarian = 294 to 284 Ma
- Llandovery = 443 to 428 Ma
- Pridolian = 418 to 416 Ma
- Danian = 65 to 61 Ma
- Oligocene = 33 to 23 Ma
- Thantian = 58 to 55 Ma
- Carnian = 228 to 216 Ma
- Ladinian = 237 to 228 Ma
- Olenekian = 249 to 245 Ma
- Aalenian = 175 to 171 Ma
- Dorashamian = 255 to 251 Ma (if it's the same as the Changhsingian stage, which I'm pretty sure it is)
- Senonian = 89 to 65 Ma
- Djultian = 260 to 255 Ma (apparently the same as Longtanian)
- Neocomian = 145 to 130 Ma
- Paleocene = 65 to 55 Ma
- Tatarian = 265 to 251 Ma
- Rhaetian = 203 to 199 Ma
- Nammalian = 251 to 245 Ma
- Mississippian = 359 to 318 Ma
- Neogene = 23 to 2 Ma
- Paleogene = 65 to 23 Ma
- Pennsylvanian = 318 to 299 Ma
- Wuchiapingian = 260 to 253 Ma