Ypeenian Australian Stage
From 470 To 468.1 +/- 1.6 Ma
End Defined By: Graptolite, lowest occurrence of Undulograptus
austrodentatus.
End Based On: Gradstein, Ogg, Smith, _A Geologic Time Scale 2004_
-- A Substage of --
Eon: Phanerozoic (542 - -5.5012e-005)
Era: Paleozoic (542 - 251)
Period: Ordovician (488.3 - 443.7)
Epoch: Middle Ordovician (471.8 - 460.9)
ICS Stage: Ordovician III (471.8 - 468.1)
General Stage: Llanvirn (471.8 - 464)
North American Stage: White Rockian (471.8 - 462)
-- Preceeded By --
Australian Stage: Castlemanian (471 - 470)
-- Followed By --
ICS Stage: Darriwilian (468.1 - 460.9)
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