Ulsterian North American Stage
From 416 +/- 2.8 To 391.8 +/- 2.7 Ma
Start Defined By: Graptolite, lowest occurrence of Monograptus uniformis.
End Defined By: Conodont, lowest occurrence of Polygnathus hemiansatus, near
base of goniatite Maenioceras Stufe.
Start Based On: Gradstein, Ogg, Smith, _A Geologic Time Scale 2004_
End Based On: Gradstein, Ogg, Smith, _A Geologic Time Scale 2004_
-- Overlaps With --
Epoch: Middle Devonian (397.5 - 385.3)
Chinese Stage: Yingtangian (397.5 - 391.4)
-- A Substage of --
Eon: Phanerozoic (542 - -5.5012e-005)
Era: Paleozoic (542 - 251)
Period: Devonian (416 - 359.2)
-- Preceeded By --
Period: Silurian (443.7 - 416)
Epoch: Late Silurian (422.9 - 416)
Sub-Epoch: Pridoli (418.7 - 416)
Australian Stage: Melbournian (428.2 - 416)
North American Stage: Cayugan (421.3 - 416)
-- Followed By --
ICS Stage: Givetian (391.8 - 385.3)
North American Stage: Erian (391.8 - 388)
-- Contains the Following Epochs --
Epoch: Early Devonian (416 - 397.5)
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