Valanginian ICS Stage
From 140.2 +/- 3 To 136.4 +/- 2 Ma
Start Defined By: Calpionellid, lowest occurrence of Calpionellites darderi
(base of Calpionellid Zone E); followed by the lowest occurrence of
ammonite "Thurmanniceras" pertransiens.
End Defined By: Ammonite, lowest occurrence of genus Acanthodiscus
(especially A. radiatus).
Start Based On: Gradstein, Ogg, Smith, _A Geologic Time Scale 2004_
End Based On: Gradstein, Ogg, Smith, _A Geologic Time Scale 2004_
-- Overlaps With --
Regional Stage: Ryzanian (142 - 136.5)
-- A Substage of --
Eon: Phanerozoic (542 - -5.5012e-005)
Era: Mesozoic (251 - 65.5)
Period: Cretaceous (145.5 - 65.5)
Epoch: Early Cretaceous (145.5 - 99.6)
European Epoch: Neocomian (145.5 - 130)
Japanese Stage: Kochian (145.5 - 136.4)
New Zealand Stage: Mokoiwian (145.5 - 119)
North American Stage: Coahulian (145.5 - 127)
-- Preceeded By --
ICS Stage: Berriasian (145.5 - 140.2)
-- Followed By --
ICS Stage: Hauterivian (136.4 - 130)
Japanese Stage: Aritan (136.4 - 125)
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