Middle Eocene Sub-Epoch
From 48.6 +/- 0.2 To 37.2 +/- 0.1 Ma
Start Defined By: Planktonic foraminifer, lowest occurrence of Hantkenina.
End Defined By: Near lowest occurrence of calcareous nannofossil
Chiasmolithus oamaruensis (base Zone NP18).
Start Based On: Gradstein, Ogg, Smith, _A Geologic Time Scale 2004_
End Based On: Gradstein, Ogg, Smith, _A Geologic Time Scale 2004_
-- Overlaps With --
Californian Stage: Ulatisian (51 - 48)
Californian Stage: Narizian (48 - 35)
New Zealand Stage: Heretaungan (50 - 47)
North American Stage: Bridgerian (50.5 - 45.4)
North American Stage: Duchesnean (40 - 37)
-- A Substage of --
Eon: Phanerozoic (542 - -5.5012e-005)
Era: Cenozoic (65.5 - -5.5012e-005)
Period: Paleogene (65.5 - 23.03)
Epoch: Eocene (55.8 - 33.9)
Australian Stage: Johannian (52 - 36)
Informal Sub-era: Tertiary (65.5 - 1.806)
-- Preceeded By --
Sub-Epoch: Early Eocene (55.8 - 48.6)
ICS Stage: Ypresian (55.8 - 48.6)
-- Followed By --
Sub-Epoch: Late Eocene (37.2 - 33.9)
ICS Stage: Priabonian (37.2 - 33.9)
-- Contains the Following Stages --
ICS Stage: Lutetian (48.6 - 40.4)
ICS Stage: Bartonian (40.4 - 37.2)
New Zealand Stage: Porangan (47 - 44)
New Zealand Stage: Bortonian (44 - 40)
New Zealand Stage: Kiaitan (40 - 37.2)
North American Stage: Uintan (45.4 - 40)
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