Dolgellian Regional Stage
(Trempealeauan, Fengshanian)
From 492.5 To 488.3 +/- 1.7 Ma
End Defined By: Conodont, lowest occurrence of Iapetognathus fluctivagus;
just above base of Cordylodus lindstromi conodont Zone. Just below lowest
occurrence of planktonic graptolites.
End Based On: Gradstein, Ogg, Smith, _A Geologic Time Scale 2004_
Comment: On scales that use a 2 stage Late Cambrian, the Dolgellian
frequently includes the Festiniogian
-- Overlaps With --
North American Stage: Sunwaptan (493 - 491)
North American Stage: Ibexian (491 - 471.8)
Russian-Kazakhian Stage: Aksayan (493 - 491.5)
-- A Substage of --
Eon: Phanerozoic (542 - -5.5012e-005)
Era: Paleozoic (542 - 251)
Period: Cambrian (542 - 488.3)
Epoch: Late Cambrian (501 - 488.3)
-- Preceeded By --
Regional Stage: Festiniogian (496.8 - 492.5)
-- Followed By --
Period: Ordovician (488.3 - 443.7)
Epoch: Early Ordovician (488.3 - 471.8)
ICS Stage: Tremadocian (488.3 - 478.6)
Australian Stage: Datsonian (488.3 - 485)
European Stage: Cressagian (488.3 - 486)
-- Contains the Following Stages --
Australian Stage: Payntonian (491 - 488.3)
Russian-Kazakhian Stage: Batyrbayan (491.5 - 488.3)
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