Arenig ICS Stage
(Arenigian, Ordovician II)
From 478.6 +/- 1.7 To 471.8 +/- 1.6 Ma
Start Defined By: Graptolite, lowest occurrence of Tetragraptus
approximatus.
End Defined By: Conodont, potentially lowest occurrence of Protoprioniodus
aranda or of Baltoniodus triangularis.
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: Diabasbrottet quarry, Vdstergvtland,
southern Sweden
Comment: Official ICS name not yet decided. Final Stage may not neccesary
coincide with the Arenig.
-- Overlaps With --
Australian Stage: Warendian/Lancefieldian (485 - 475)
Australian Stage: Lancefieldian (482 - 475)
Australian Stage: Chewtonian (473 - 471)
-- A Substage of --
Eon: Phanerozoic (542 - -5.5012e-005)
Era: Paleozoic (542 - 251)
Period: Ordovician (488.3 - 443.7)
Epoch: Early Ordovician (488.3 - 471.8)
North American Stage: Ibexian (491 - 471.8)
-- Preceeded By --
ICS Stage: Tremadocian (488.3 - 478.6)
Australian Stage: Warendian (485 - 478.6)
European Stage: Migneintian (486 - 478.6)
-- Followed By --
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)
-- Contains the Following Stages --
Australian Stage: Bendigonian (475 - 473)
Chinese Stage: Honghuayuanian (478.6 - 472)
Chinese Stage: Dawanian (472 - 471.8)
European Stage: Moridunian (478.6 - 475)
European Stage: Whitlandian (475 - 473.5)
European Stage: Fennian (473.5 - 471.8)
North American Stage: Demingian (478.6 - 475)
North American Stage: Jeffersonian (475 - 473)
North American Stage: Cassinian (473 - 471.8)
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