Freboldi chron
186.2 - 185.1 Ma
The definition of this interval in the timescale Ammonite Chrons of North America is taken 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
The top and bottom ages 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.
There are intervals in 5 timescales which overlap this one. show
This interval is used in the definition of 21 collections
A total of 21 collections with 57 occurrences lie within this time span
International Chronostratigraphic Timescale | Ammonite Chrons of North America | |||||
---|---|---|---|---|---|---|
Quaternary | Holocene | Meghalayan | 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 | 11.63 | |||||
Langhian | 13.82 | |||||
Burdigalian | 15.98 | |||||
Aquitanian | 20.44 | |||||
Paleogene | Oligocene | Chattian | 23.03 | |||
Rupelian | 27.82 | |||||
Eocene | Priabonian | 33.9 | ||||
Bartonian | 37.71 | |||||
Lutetian | 41.2 | |||||
Ypresian | 47.8 | |||||
Paleocene | Thanetian | 56 | ||||
Selandian | 59.2 | |||||
Danian | 61.6 | |||||
Cretaceous | Late Cretaceous | Maastrichtian | 66 | |||
Campanian | 72.1 | |||||
Santonian | 83.6 | |||||
Coniacian | 86.3 | |||||
Turonian | 89.8 | |||||
Cenomanian | 93.9 | |||||
Early Cretaceous | Albian | 100.5 | ||||
Aptian | 113 | |||||
Barremian | 121.4 | |||||
Hauterivian | 125.77 | |||||
Valanginian | 132.6 | |||||
Berriasian | 139.8 | |||||
Jurassic | Late Jurassic | Tithonian | 145 | |||
Kimmeridgian | 149.2 | |||||
Oxfordian | 154.8 | |||||
Middle Jurassic | Callovian | 161.5 | ||||
Bathonian | 165.3 | |||||
Bajocian | Epizigzagiceras | 168.2 | ||||
Rotundum/Oblatum/Kirschneri/Crassicostatus/Widebayense | 168.4 | |||||
Aalenian | Howelli/Scissum/Westermanni | 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 | 184.2 | |||||
Freboldi | 185.1 * | |||||
Whiteavesi/Imlayi | Tetraspidoceras | 186.2 * | ||||
189.2 * | ||||||
Plesechioceras harbledownense/Asteroceras varians/Coroniceras | Canadensis | 190.3 * | ||||
Sinemurian | 192.9 | |||||
Pseudaetomoceras | Psiloceras | 196.4 * | ||||
Franziceras/Euphyllites | 196.5 * | |||||
Hettangian | 199.5 | |||||
Triassic | Late Triassic | Rhaetian | 201.4 | |||
Norian | 208.5 | |||||
Carnian | 227 | |||||
Middle Triassic | Ladinian | 237 | ||||
Anisian | 242 | |||||
Early Triassic | Olenekian | 247.2 | ||||
Induan | 251.2 | |||||
251.902 |