Aptian ICS Stage
(Urgonian)
From 125 +/- 1 To 112 +/- 1 Ma
Start Defined By: Magnetic polarity chronozone, base of M0r.
End Defined By: Calcareous nannofossil, lowest occurrence of
Praediscosphaera columnata (= P. cretacea of some earlier studies), is one
potential marker.
Start Based On: Gradstein, Ogg, Smith, _A Geologic Time Scale 2004_
End Based On: Gradstein, Ogg, Smith, _A Geologic Time Scale 2004_
-- Overlaps With --
New Zealand Stage: Mokoiwian (145.5 - 119)
New Zealand Stage: Korangian (119 - 110)
-- 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: Gallic (130 - 89.3)
Japanese Stage: Miyakoan (125 - 96.6)
North American Stage: Comanchean (127 - 99.6)
-- Preceeded By --
ICS Stage: Barremian (130 - 125)
Japanese Stage: Aritan (136.4 - 125)
-- Followed By --
ICS Stage: Albian (112 - 99.6)
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