Kimmeridgian ICS Stage
From 155.7 +/- 4 To 150.8 +/- 4 Ma
Start Defined By: Ammonite, near base of Pictonia baylei ammonite zone of
Boreal realm.
End 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, Ogg, Smith, _A Geologic Time Scale 2004_
Comment: This definition is approximately 1 Myr older than previously used
Tethyan event boundary.
-- Overlaps With --
New Zealand Stage: Heterian (156 - 152)
New Zealand Stage: Ohauan (152 - 150)
-- A Substage of --
Eon: Phanerozoic (542 - -5.5012e-005)
Era: Mesozoic (251 - 65.5)
Period: Jurassic (199.6 - 145.5)
Epoch: Late Jurassic (161.2 - 145.5)
Chinese Stage: Suiningian (161.2 - 149)
-- Preceeded By --
ICS Stage: Oxfordian (161.2 - 155.7)
-- Followed By --
ICS Stage: Tithonian (150.8 - 145.5)
Regional Stage: Volgian (150.8 - 142)
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