Onnian Regional Stage
From 453 To 449 Ma
End Based On: Gradstein and Ogg, "A Phanerozoic time scale", _Episodes_,
v.19, no.1&2., 1996.
-- Overlaps With --
Australian Stage: Eastonian (456 - 450)
Australian Stage: Bolindian (450 - 443.7)
European Stage: Cheneyan (455 - 452)
North American Stage: Mohawkian (462 - 451)
North American Stage: Cincinnatian (451 - 443.7)
-- 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 VI (455.8 - 445.6)
Chinese Stage: Linxiangian (454.5 - 449)
General Stage: Caradoc (460.9 - 449)
Regional Stage: Edenian (454 - 449)
Regional Stage: Mayvillian (453 - 447.5)
-- Preceeded By --
Regional Stage: Actonian (454 - 453)
-- Followed By --
European Stage: Pusgillian (449 - 447.5)
General Stage: Ashgill (449 - 443.7)
Regional Stage: Richmondian (449 - 445.6)
-- Contains the Following Stages --
European Stage: Streffordian (452 - 449)
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