Ibexian North American Stage
From 491 To 471.8 +/- 1.6 Ma
End Defined By: Conodont, potentially lowest occurrence of Protoprioniodus
aranda or of Baltoniodus triangularis.
End Based On: Gradstein, Ogg, Smith, _A Geologic Time Scale 2004_
-- Overlaps With --
Period: Cambrian (542 - 488.3)
Period: Ordovician (488.3 - 443.7)
Epoch: Late Cambrian (501 - 488.3)
Australian Stage: Chewtonian (473 - 471)
Regional Stage: Dolgellian (492.5 - 488.3)
Russian-Kazakhian Stage: Batyrbayan (491.5 - 488.3)
-- A Substage of --
Eon: Phanerozoic (542 - -5.5012e-005)
Era: Paleozoic (542 - 251)
-- Preceeded By --
North American Stage: Sunwaptan (493 - 491)
-- 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 Epochs --
Epoch: Early Ordovician (488.3 - 471.8)
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