Middle Cambrian Epoch
(St. David's, Albertan, Saint David's, Acadian)
From 513 +/- 2 To 501 +/- 2 Ma
End Defined By: Trilobite, lowest occurrence of agnostoid Glyptagnostus
reticulatus. Coincides with base of large positive carbon-isotope
excursion.
Start Based On: Gradstein, Ogg, Smith, _A Geologic Time Scale 2004_
End Based On: Gradstein, Ogg, Smith, _A Geologic Time Scale 2004_
-- Overlaps With --
Australian Stage: Ordian (520 - 510)
North American Stage: Dyeran (524.5 - 512)
North American Stage: Marjuman (504 - 494.5)
-- A Substage of --
Eon: Phanerozoic (542 - -5.5012e-005)
Era: Paleozoic (542 - 251)
Period: Cambrian (542 - 488.3)
-- Preceeded By --
Epoch: Early Cambrian (542 - 513)
Chinese Stage: Longwangmioan (518 - 513)
Regional Stage: Lenian (524 - 513)
Russian-Kazakhian Stage: Toyonian (518.5 - 513)
-- Followed By --
Epoch: Late Cambrian (501 - 488.3)
ICS Stage: Paibian (501 - 496)
Australian Stage: Mindyallan (501 - 497)
Regional Stage: Maentwrogian (501 - 496.8)
Russian-Kazakhian Stage: Ayusokkanian (501 - 494.5)
-- Contains the Following Stages --
Australian Stage: Templetonian (510 - 508)
Australian Stage: Florian (508 - 506)
Australian Stage: Undillian (506 - 504)
Australian Stage: Boomerangian (504 - 501)
Chinese Stage: Maozhangian (513 - 509)
Chinese Stage: Zuzhuangian (509 - 505)
Chinese Stage: Zhungxian (505 - 501)
North American Stage: Delamaran (512 - 504)
Russian-Kazakhian Stage: Amgan (513 - 502)
Russian-Kazakhian Stage: Mayan (502 - 501)
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