Frasnian ICS Stage
(Sonyean, West Fallsian, Shetianqiaoan)
From 385.3 +/- 2.6 To 374.5 +/- 2.6 Ma
Start Defined By: Conodont, lowest occurrence of Ancyrodella rotundiloba
(defines base of Lower Polygnathus asymmetricus conodont Zone).
End Defined By: Just above major extinction horizon (Upper Kellwasser Event),
including conodonts Ancyrodella and Ozarkodina and goniatites of
Gephuroceratidae and Beloceratidae.
Start Based On: Gradstein, Ogg, Smith, _A Geologic Time Scale 2004_
End Based On: Gradstein, Ogg, Smith, _A Geologic Time Scale 2004_
Global Stratotype Section and Point: Col du Puech de la Suque section, St.
Nazaire-de-Ladarez, SE Montagne Noir, southern France
-- A Substage of --
Eon: Phanerozoic (542 - -5.5012e-005)
Era: Paleozoic (542 - 251)
Period: Devonian (416 - 359.2)
Epoch: Late Devonian (385.3 - 359.2)
North American Stage: Senecan (388 - 370)
-- Preceeded By --
Epoch: Middle Devonian (397.5 - 385.3)
ICS Stage: Givetian (391.8 - 385.3)
Chinese Stage: Dongganglingian (391.4 - 385.3)
-- Followed By --
ICS Stage: Famennian (374.5 - 359.2)
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