Ryzanian Regional Stage
From 142 To 136.5 Ma
Start Based On: Gradstein and Ogg, "A Phanerozoic time scale", _Episodes_,
v.19, no.1&2., 1996.
End Based On: Gradstein and Ogg, "A Phanerozoic time scale", _Episodes_,
v.19, no.1&2., 1996.
-- Overlaps With --
ICS Stage: Berriasian (145.5 - 140.2)
ICS Stage: Valanginian (140.2 - 136.4)
-- 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 --
Regional Stage: Volgian (150.8 - 142)
Regional Stage: Portlandian (146 - 142)
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