Demingian North American Stage
From 478.6 +/- 1.7 To 475 Ma
Start Defined By: Graptolite, lowest occurrence of Tetragraptus
approximatus.
Start 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: Early Ordovician (488.3 - 471.8)
ICS Stage: Arenig (478.6 - 471.8)
Australian Stage: Lancefieldian (482 - 475)
Australian Stage: Warendian/Lancefieldian (485 - 475)
Chinese Stage: Honghuayuanian (478.6 - 472)
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 --
Australian Stage: Bendigonian (475 - 473)
European Stage: Whitlandian (475 - 473.5)
North American Stage: Jeffersonian (475 - 473)
-- Contains the Following Stages --
European Stage: Moridunian (478.6 - 475)
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