Olenekian ICS Stage
(Yongningzhenian)
From 249.7 +/- 0.7 To 245 +/- 1.5 Ma
Start Defined By: Near lowest occurrence of Hedenstroemia or Meekoceras
gracilitatis ammonites, and of the conodont Neospathodus waageni.
End Defined By: Ammonite, near lowest occurrences of genera Japonites,
Paradanubites, and Paracrochordiceras; and of the conodont Chiosella
timorensis.
Start Based On: Gradstein, Ogg, Smith, _A Geologic Time Scale 2004_
End Based On: Gradstein, Ogg, Smith, _A Geologic Time Scale 2004_
-- Overlaps With --
New Zealand Stage: Malakovian (248 - 243)
-- A Substage of --
Eon: Phanerozoic (542 - -5.5012e-005)
Era: Mesozoic (251 - 65.5)
Period: Triassic (251 - 199.6)
Epoch: Early Triassic (251 - 245)
-- Preceeded By --
ICS Stage: Induan (251 - 249.7)
Regional Stage: Dienerian (250.4 - 249.7)
-- Followed By --
Epoch: Middle Triassic (245 - 228)
ICS Stage: Anisian (245 - 237)
Regional Stage: Aegean (245 - 243)
-- Contains the Following Stages --
Regional Stage: Smithian (249.7 - 247.4)
Regional Stage: Spathian (247.4 - 245)
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