Aalenian ICS Stage
From 175.6 +/- 2 To 171.6 +/- 3 Ma
Start Defined By: Ammonite, lowest occurrence of Leioceras genus.
End Defined By: Ammonite, lowest occurrence of the genus Hyperlioceras
(defines base of the Hyperlioceras discites Zone).
Start Based On: Gradstein, Ogg, Smith, _A Geologic Time Scale 2004_
End Based On: Gradstein, Ogg, Smith, _A Geologic Time Scale 2004_
Global Stratotype Section and Point: Fuentelsalz, central Spain
-- A Substage of --
Eon: Phanerozoic (542 - -5.5012e-005)
Era: Mesozoic (251 - 65.5)
Period: Jurassic (199.6 - 145.5)
Epoch: Middle Jurassic (175.6 - 161.2)
Chinese Stage: Xintiangouan (175.6 - 167)
New Zealand Stage: Uruoan (188 - 169)
-- Preceeded By --
Epoch: Early Jurassic (199.6 - 175.6)
ICS Stage: Toarcian (183 - 175.6)
-- Followed By --
ICS Stage: Bajocian (171.6 - 167.7)
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