Sinemurian ICS Stage
From 196.5 +/- 1 To 189.6 +/- 1.5 Ma
Start Defined By: Ammonite, lowest occurrence of arietitid genera Vermiceras
and Metophioceras.
End Defined By: Ammonite, lowest occurrences of Bifericeras donovani and of
genera Apoderoceras and Gleviceras.
Start Based On: Gradstein, Ogg, Smith, _A Geologic Time Scale 2004_
End Based On: Gradstein, Ogg, Smith, _A Geologic Time Scale 2004_
Global Stratotype Section and Point: East Quantoxead, Watchet, West Somerset,
SW England, UK
-- A Substage of --
Eon: Phanerozoic (542 - -5.5012e-005)
Era: Mesozoic (251 - 65.5)
Period: Jurassic (199.6 - 145.5)
Epoch: Early Jurassic (199.6 - 175.6)
New Zealand Stage: Aratauran (199.6 - 188)
-- Preceeded By --
ICS Stage: Hettangian (199.6 - 196.5)
-- Followed By --
ICS Stage: Pliensbachian (189.6 - 183)
-- Contains the Following Stages --
Regional Stage: Lotharingian (193.3 - 189.6)
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