Tremadocian ICS Stage
(Gasconadian, Tremadoc, Lianghekouan)
From 488.3 +/- 1.7 To 478.6 +/- 1.7 Ma
Start Defined By: Conodont, lowest occurrence of Iapetognathus fluctivagus;
just above base of Cordylodus lindstromi conodont Zone. Just below lowest
occurrence of planktonic graptolites.
End Defined By: Graptolite, lowest occurrence of Tetragraptus approximatus.
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: Green Point, western Newfoundland,
Canada
-- Overlaps With --
Australian Stage: Warendian/Lancefieldian (485 - 475)
Australian Stage: Lancefieldian (482 - 475)
-- 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 --
Period: Cambrian (542 - 488.3)
Epoch: Late Cambrian (501 - 488.3)
Australian Stage: Payntonian (491 - 488.3)
Regional Stage: Dolgellian (492.5 - 488.3)
Russian-Kazakhian Stage: Batyrbayan (491.5 - 488.3)
-- Followed By --
ICS Stage: Arenig (478.6 - 471.8)
Chinese Stage: Honghuayuanian (478.6 - 472)
European Stage: Moridunian (478.6 - 475)
North American Stage: Demingian (478.6 - 475)
-- Contains the Following Stages --
Australian Stage: Datsonian (488.3 - 485)
Australian Stage: Warendian (485 - 478.6)
European Stage: Cressagian (488.3 - 486)
European Stage: Migneintian (486 - 478.6)
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