Volgian Regional Stage
From 150.8 +/- 4 To 142 Ma
Start Defined By: Near base of Hybonoticeras hybonotum ammonite zone and
lowest occurrence of Gravesia genus, and the base of magnetic polarity
chronozone M22An.
Start Based On: Gradstein, Ogg, Smith, _A Geologic Time Scale 2004_
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: Berriasian (145.5 - 140.2)
Chinese Stage: Suiningian (161.2 - 149)
European Epoch: Neocomian (145.5 - 130)
Japanese Stage: Kochian (145.5 - 136.4)
New Zealand Stage: Ohauan (152 - 150)
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)
-- Preceeded By --
ICS Stage: Kimmeridgian (155.7 - 150.8)
-- Followed By --
Regional Stage: Ryzanian (142 - 136.5)
-- Contains the Following Stages --
ICS Stage: Tithonian (150.8 - 145.5)
Chinese Stage: Penglaizhenian (149 - 145.5)
New Zealand Stage: Puaroan (150 - 145.5)
Regional Stage: Portlandian (146 - 142)
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