Semicostatum chron

199.5 - 192.9 Ma

The definition of this interval in the timescale Ammonite Chrons of Northwest Europe 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

There are intervals in 6 timescales which overlap this one. show

This interval is used in the definition of 49 collections

A total of 2294 collections with 12621 occurrences lie within this time span

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International Chronostratigraphic TimescaleAmmonite Chrons of Northwest EuropeAmmonite Chrons of North America
QuaternaryHoloceneMeghalayan0
Northgrippian0.0042
Greenlandian0.0082
PleistoceneLate Pleistocene0.0117
Chibanian0.129
Calabrian0.774
Gelasian1.8
NeogenePliocenePiacenzian2.58
Zanclean3.6
MioceneMessinian5.333
Tortonian7.246
Serravallian11.63
Langhian13.82
Burdigalian15.98
Aquitanian20.45
PaleogeneOligoceneChattian23.04
Rupelian27.3
EocenePriabonian33.9
Bartonian37.71
Lutetian41.03
Ypresian48.07
PaleoceneThanetian56
Selandian59.24
Danian61.66
CretaceousLate CretaceousMaastrichtian66
Campanian72.2
Santonian83.6
Coniacian85.7
Turonian89.8
Cenomanian93.9
Early CretaceousAlbian100.5
Aptian113.2
Barremian121.4
Hauterivian125.77
Valanginian132.6
Berriasian137.05
JurassicLate JurassicTithonian143.1
Kimmeridgian149.2
Oxfordian154.8
Middle JurassicCallovian161.5
Bathonian165.3
BajocianParkinsoni/Garantiana/Subfurcatum/Sauzei/Laeviuscula/DiscitesEpizigzagiceras168.2
HumphresianumRotundum/Oblatum/Kirschneri/Crassicostatus/Widebayense168.6 *
AalenianConcavum/Murchisonae/OpalinumHowelli/Scissum/Westermanni170.9
Early JurassicToarcianLevesquei/Variabilis/BifronsThouarsenseYakounensis/Hillebrandti/Crassicosta174.7
Planulata179.3 *
Arnioceras arnouldi179.8 *
180.4 *
Kanense181.3 *
Carlottense182.3 *
Serpentinum/Falciferum/Tenuicostatum182.9 *
Kunae183.5 *
PliensbachianSpinatum/Margaritatus/Davoei/Ibex/Jamesoni184.2
Freboldi185.1 *
Whiteavesi/ImlayiTetraspidoceras186.2 *
189.2 *
Plesechioceras harbledownense/Asteroceras varians/CoronicerasCanadensis190.3 *
SinemurianRaricostatum/Oxynotum/Obtusum/Turneri/Semicostatum/Bucklandi192.9
PseudaetomocerasPsiloceras196.4 *
Franziceras/Euphyllites196.5 *
HettangianAngulata/Liasicus/Planorbis199.5
TriassicLate TriassicRhaetian201.4
Norian205.7
Carnian227.3
Middle TriassicLadinian237
Anisian241.464
Early TriassicOlenekian246.7
Induan249.9
251.902