Late Ordovician Epoch
(Upper Ordovician, Bala, Balan)
From 460.9 +/- 1.6 To 443.7 +/- 1.5 Ma
Start Defined By: Graptolite, lowest occurrence of Nemagraptus gracilis.
End Defined By: Graptolites, lowest occurrences of Parakidograptus
acuminatus and Akidograptus ascensus.
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: Mohawkian (462 - 451)
-- A Substage of --
Eon: Phanerozoic (542 - -5.5012e-005)
Era: Paleozoic (542 - 251)
Period: Ordovician (488.3 - 443.7)
-- Preceeded By --
Epoch: Middle Ordovician (471.8 - 460.9)
ICS Stage: Darriwilian (468.1 - 460.9)
General Stage: Llandeilo (464 - 460.9)
-- Followed By --
Period: Silurian (443.7 - 416)
Epoch: Early Silurian (443.7 - 422.9)
Sub-Epoch: Llandovery (443.7 - 428.2)
ICS Stage: Rhuddanian (443.7 - 439)
Australian Stage: Keiloran (443.7 - 433)
Chinese Stage: Longmaxian (443.7 - 438)
North American Stage: Medinan (443.7 - 438)
Regional Stage: Alexandrian (443.7 - 436)
-- Contains the Following Stages --
ICS Stage: Ordovician V (460.9 - 455.8)
ICS Stage: Ordovician VI (455.8 - 445.6)
ICS Stage: Hirnantian (445.6 - 443.7)
Australian Stage: Gisbornian (460.9 - 456)
Australian Stage: Eastonian (456 - 450)
Australian Stage: Bolindian (450 - 443.7)
Chinese Stage: Baotan (460.9 - 454.5)
Chinese Stage: Linxiangian (454.5 - 449)
European Stage: Aurelucian (460.9 - 457)
European Stage: Burrellian (457 - 455)
European Stage: Cheneyan (455 - 452)
European Stage: Streffordian (452 - 449)
European Stage: Pusgillian (449 - 447.5)
European Stage: Cautleyan (447.5 - 446.5)
European Stage: Rawtheyan (446.5 - 445.6)
General Stage: Caradoc (460.9 - 449)
General Stage: Ashgill (449 - 443.7)
North American Stage: Cincinnatian (451 - 443.7)
Regional Stage: Longvillian (457 - 455)
Regional Stage: Shermanian (457 - 454)
Regional Stage: Soudleyan (458 - 457)
Regional Stage: Harnagian (459 - 458)
Regional Stage: Costonian (460.9 - 459)
Regional Stage: Marshbrookian (455 - 454)
Regional Stage: Edenian (454 - 449)
Regional Stage: Actonian (454 - 453)
Regional Stage: Mayvillian (453 - 447.5)
Regional Stage: Onnian (453 - 449)
Regional Stage: Richmondian (449 - 445.6)
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