Ammonite Chrons of North America
The interval definitions in this timescale are derived from the following source:
- J. Palfy, P. L. Smith, and J. K. Mortensen. 2000. A U-Pb and 40Ar/39Ar time scale for the Jurassic. Canadian Journal of Earth Sciences 37(6):923-944 view
There are 5 timescales which overlap this one. show
Interval boundaries marked with * have been interpolated based on the differences between the ages for international timescale boundaries quoted in the source and the currently accepted ages for those boundaries.
This timescale is used in the definition of 196 collections
| International Chronostratigraphic Timescale | Ammonite Chrons of North America | Ten Million Year Bins | |||||
|---|---|---|---|---|---|---|---|
| Quaternary | Holocene | Meghalayan | Cenozoic 6 | 0 | |||
| Northgrippian | 0.0042 | ||||||
| Greenlandian | 0.0082 | ||||||
| Pleistocene | Late Pleistocene | 0.0117 | |||||
| Chibanian | 0.129 | ||||||
| Calabrian | 0.774 | ||||||
| Gelasian | 1.8 | ||||||
| Neogene | Pliocene | Piacenzian | 2.58 | ||||
| Zanclean | 3.6 | ||||||
| Miocene | Messinian | 5.333 | |||||
| Tortonian | 7.246 | ||||||
| Serravallian | Cenozoic 5 | 11.63 | |||||
| Langhian | 13.82 | ||||||
| Burdigalian | 15.98 | ||||||
| Aquitanian | 20.44 | ||||||
| Paleogene | Oligocene | Chattian | Cenozoic 4 | 23.03 | |||
| Rupelian | 27.82 | ||||||
| Eocene | Priabonian | Cenozoic 3 | 33.9 | ||||
| Bartonian | 37.71 | ||||||
| Lutetian | Cenozoic 2 | 41.2 | |||||
| Ypresian | 47.8 | ||||||
| Paleocene | Thanetian | Cenozoic 1 | 56 | ||||
| Selandian | 59.2 | ||||||
| Danian | 61.6 | ||||||
| Cretaceous | Late Cretaceous | Maastrichtian | Cretaceous 8 | 66 | |||
| Campanian | Cretaceous 7 | 72.1 | |||||
| Santonian | Cretaceous 6 | 83.6 | |||||
| Coniacian | 86.3 | ||||||
| Turonian | 89.8 | ||||||
| Cenomanian | Cretaceous 5 | 93.9 | |||||
| Early Cretaceous | Albian | Cretaceous 4 | 100.5 | ||||
| Aptian | Cretaceous 3 | 113 | |||||
| Barremian | Cretaceous 2 | 121.4 | |||||
| Hauterivian | 125.77 | ||||||
| Valanginian | Cretaceous 1 | 132.6 | |||||
| Berriasian | 139.8 | ||||||
| Jurassic | Late Jurassic | Tithonian | Jurassic 6 | 145 | |||
| Kimmeridgian | Jurassic 5 | 149.2 | |||||
| Oxfordian | 154.8 | ||||||
| Middle Jurassic | Callovian | 161.5 | |||||
| Bathonian | Jurassic 4 | 165.3 | |||||
| Bajocian | Epizigzagiceras | 168.2 | |||||
| Rotundum/Oblatum/Kirschneri/Crassicostatus/Widebayense | 168.4 | ||||||
| Aalenian | Howelli/Scissum/Westermanni | Jurassic 3 | 170.9 | ||||
| Early Jurassic | Toarcian | Yakounensis/Hillebrandti/Crassicosta | 174.7 | ||||
| Planulata | 179.3 * | ||||||
| Arnioceras arnouldi | 179.8 * | ||||||
| Kanense | 181.3 * | ||||||
| Carlottense | 182.3 * | ||||||
| Kunae | 183.5 * | ||||||
| Pliensbachian | Jurassic 2 | 184.2 | |||||
| Freboldi | 185.1 * | ||||||
| Whiteavesi/Imlayi | Tetraspidoceras | 186.2 * | |||||
| 189.2 * | |||||||
| Plesechioceras harbledownense/Asteroceras varians/Coroniceras | Canadensis | 190.3 * | |||||
| Sinemurian | Jurassic 1 | 192.9 | |||||
| Pseudaetomoceras | Psiloceras | 196.4 * | |||||
| Franziceras/Euphyllites | 196.5 * | ||||||
| Hettangian | 199.5 | ||||||
| Triassic | Late Triassic | Rhaetian | Triassic 4 | 201.4 | |||
| Norian | 208.5 | ||||||
| Carnian | Triassic 3 | 227 | |||||
| Middle Triassic | Ladinian | Triassic 2 | 237 | ||||
| Anisian | 242 | ||||||
| Early Triassic | Olenekian | Triassic 1 | 247.2 | ||||
| Induan | 251.2 | ||||||
| Permian | Lopingian | Changhsingian | Permian 4 | 251.902 | |||
| Wuchiapingian | 254.14 | ||||||
| Guadalupian | Capitanian | 259.51 | |||||
| Wordian | 264.28 | ||||||
| Roadian | Permian 3 | 266.9 | |||||
| Cisuralian | Kungurian | Permian 2 | 273.01 | ||||
| Artinskian | 283.5 | ||||||
| Sakmarian | 290.1 | ||||||
| Asselian | Permian 1 | 293.52 | |||||
| Carboniferous | Pennsylvanian | Gzhelian | Carboniferous 5 | 298.9 | |||
| Kasimovian | 303.7 | ||||||
| Moscovian | Carboniferous 4 | 307 | |||||
| Bashkirian | 315.2 | ||||||
| Mississippian | Serpukhovian | Carboniferous 3 | 323.2 | ||||
| Visean | Carboniferous 2 | 330.9 | |||||
| Tournaisian | Carboniferous 1 | 346.7 | |||||
| Devonian | Late Devonian | Famennian | Devonian 5 | 358.9 | |||
| Frasnian | Devonian 4 | 372.2 | |||||
| Middle Devonian | Givetian | Devonian 3 | 382.7 | ||||
| Eifelian | 387.7 | ||||||
| Early Devonian | Emsian | Devonian 2 | 393.3 | ||||
| Pragian | Devonian 1 | 407.6 | |||||
| Lochkovian | 410.8 | ||||||
| Silurian | Pridoli | Silurian 2 | 419.2 | ||||
| Ludlow | Ludfordian | 423 | |||||
| Gorstian | 425.6 | ||||||
| Wenlock | Homerian | 427.4 | |||||
| Sheinwoodian | 430.5 | ||||||
| Llandovery | Telychian | Silurian 1 | 433.4 | ||||
| Aeronian | 438.5 | ||||||
| Rhuddanian | 440.8 | ||||||
| Ordovician | Late Ordovician | Hirnantian | Ordovician 5 | 443.8 | |||
| Katian | 445.2 | ||||||
| Sandbian | Ordovician 4 | 453 | |||||
| Middle Ordovician | Darriwilian | Ordovician 3 | 458.4 | ||||
| Dapingian | Ordovician 2 | 467.3 | |||||
| Early Ordovician | Floian | 470 | |||||
| Tremadocian | Ordovician 1 | 477.7 | |||||
| Cambrian | Furongian | Stage 10 | Cambrian 5 | 485.4 | |||
| Jiangshanian | 489.5 | ||||||
| Paibian | 494 | ||||||
| Miaolingian | Guzhangian | Cambrian 4 | 497 | ||||
| Drumian | 500.5 | ||||||
| Wuliuan | Cambrian 3 | 504.5 | |||||
| Series 2 | Stage 4 | 509 | |||||
| Stage 3 | Cambrian 2 | 514 | |||||
| Terreneuvian | Stage 2 | 521 | |||||
| Fortunian | Cambrian 1 | 529 | |||||
| 538.8 | |||||||