Middle Devonian Epoch
(Cazenovian)
From 397.5 +/- 2.7 To 385.3 +/- 2.6 Ma
Start Defined By: Conodont, lowest occurrence of Polygnathus costatus
partitus; major faunal turnover.
End Defined By: Conodont, lowest occurrence of Ancyrodella rotundiloba
(defines base of Lower Polygnathus asymmetricus conodont Zone).
Start Based On: Gradstein, Ogg, Smith, _A Geologic Time Scale 2004_
End Based On: Gradstein, Ogg, Smith, _A Geologic Time Scale 2004_
-- Overlaps With --
North American Stage: Ulsterian (416 - 391.8)
North American Stage: Senecan (388 - 370)
-- A Substage of --
Eon: Phanerozoic (542 - -5.5012e-005)
Era: Paleozoic (542 - 251)
Period: Devonian (416 - 359.2)
-- Preceeded By --
Epoch: Early Devonian (416 - 397.5)
ICS Stage: Emsian (407 - 397.5)
-- Followed By --
Epoch: Late Devonian (385.3 - 359.2)
ICS Stage: Frasnian (385.3 - 374.5)
-- Contains the Following Stages --
ICS Stage: Eifelian (397.5 - 391.8)
ICS Stage: Givetian (391.8 - 385.3)
Chinese Stage: Yingtangian (397.5 - 391.4)
Chinese Stage: Dongganglingian (391.4 - 385.3)
North American Stage: Erian (391.8 - 388)
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