Erian North American Stage
From 391.8 +/- 2.7 To 388 Ma
Start 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_
-- Overlaps With --
Chinese Stage: Yingtangian (397.5 - 391.4)
Chinese Stage: Dongganglingian (391.4 - 385.3)
-- A Substage of --
Eon: Phanerozoic (542 - -5.5012e-005)
Era: Paleozoic (542 - 251)
Period: Devonian (416 - 359.2)
Epoch: Middle Devonian (397.5 - 385.3)
ICS Stage: Givetian (391.8 - 385.3)
-- Preceeded By --
ICS Stage: Eifelian (397.5 - 391.8)
North American Stage: Ulsterian (416 - 391.8)
-- Followed By --
North American Stage: Senecan (388 - 370)
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