Hadrynian North American Stage
From 850 +/- 0 To 542 +/- 0.3 Ma
Start Defined By: Fixed Date
End Defined By: Trace fossil, lowest occurrence of Treptichnus (Phycodes)
pedum. Near base of negative carbon-isotope excursion.
Start Based On: Gradstein, Ogg, Smith, _A Geologic Time Scale 2004_
End Based On: Amthor et. al., "Extinction of Cloudinia and Namacalathus at
the Precambrian-Cambrian boundary in Oman", _Geology_, v. 31, p. 431-434,
2003.
-- Overlaps With --
Chinese Stage: Jinningian (1750 - 800)
General Stage: Riphean (1400 - 800)
General Substage: Karatau (1100 - 800)
-- A Substage of --
Time: Precambrian (4567.17 - 542)
Eon: Proterozoic (2500 - 542)
Era: Neoproterozoic (1000 - 542)
Australian Stage: Adelaidean (1300 - 542)
South African Stage: Namibian (900 - 542)
-- Preceeded By --
Period: Tonian (1000 - 850)
North American Stage: Helikian (1600 - 850)
-- Followed By --
Eon: Phanerozoic (542 - -5.5012e-005)
Era: Paleozoic (542 - 251)
Period: Cambrian (542 - 488.3)
Epoch: Early Cambrian (542 - 513)
Chinese Stage: Meishuchuan (542 - 532)
Russian-Kazakhian Stage: Nemakit-Daldynian (542 - 534)
-- Contains the Following Periods --
Period: Cryogenian (850 - 630)
Period: Ediacaran (630 - 542)
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