Costonian Regional Stage
(Blackriverian, Blackriveran, Black Riveran)
From 460.9 +/- 1.6 To 459 Ma
Start Defined By: Graptolite, lowest occurrence of Nemagraptus gracilis.
Start Based On: Gradstein, Ogg, Smith, _A Geologic Time Scale 2004_
-- A Substage of --
Eon: Phanerozoic (542 - -5.5012e-005)
Era: Paleozoic (542 - 251)
Period: Ordovician (488.3 - 443.7)
Epoch: Late Ordovician (460.9 - 443.7)
ICS Stage: Ordovician V (460.9 - 455.8)
Australian Stage: Gisbornian (460.9 - 456)
Chinese Stage: Baotan (460.9 - 454.5)
European Stage: Aurelucian (460.9 - 457)
General Stage: Caradoc (460.9 - 449)
North American Stage: Mohawkian (462 - 451)
-- Preceeded By --
Epoch: Middle Ordovician (471.8 - 460.9)
ICS Stage: Darriwilian (468.1 - 460.9)
General Stage: Llandeilo (464 - 460.9)
-- Followed By --
Regional Stage: Harnagian (459 - 458)
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