Portlandian Regional Stage
From 146 To 142 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 --
Period: Jurassic (199.6 - 145.5)
Period: Cretaceous (145.5 - 65.5)
Epoch: Late Jurassic (161.2 - 145.5)
Epoch: Early Cretaceous (145.5 - 99.6)
ICS Stage: Tithonian (150.8 - 145.5)
ICS Stage: Berriasian (145.5 - 140.2)
Chinese Stage: Penglaizhenian (149 - 145.5)
European Epoch: Neocomian (145.5 - 130)
Japanese Stage: Kochian (145.5 - 136.4)
New Zealand Stage: Puaroan (150 - 145.5)
New Zealand Stage: Mokoiwian (145.5 - 119)
North American Stage: Coahulian (145.5 - 127)
-- A Substage of --
Eon: Phanerozoic (542 - -5.5012e-005)
Era: Mesozoic (251 - 65.5)
Regional Stage: Volgian (150.8 - 142)
-- Followed By --
Regional Stage: Ryzanian (142 - 136.5)
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