Tonian Period
From 1000 +/- 0 To 850 +/- 0 Ma
Start Defined By: Fixed Date
End Defined By: Fixed Date
Start Based On: Gradstein, Ogg, Smith, _A Geologic Time Scale 2004_
End Based On: Gradstein, Ogg, Smith, _A Geologic Time Scale 2004_
-- Overlaps With --
South African Stage: Mokolian (2050 - 900)
South African Stage: Namibian (900 - 542)
-- A Substage of --
Time: Precambrian (4567.17 - 542)
Eon: Proterozoic (2500 - 542)
Era: Neoproterozoic (1000 - 542)
Australian Stage: Adelaidean (1300 - 542)
Chinese Stage: Jinningian (1750 - 800)
General Stage: Riphean (1400 - 800)
General Substage: Karatau (1100 - 800)
North American Stage: Helikian (1600 - 850)
-- Preceeded By --
Era: Mesoproterozoic (1600 - 1000)
Period: Stenian (1200 - 1000)
-- Followed By --
Period: Cryogenian (850 - 630)
North American Stage: Hadrynian (850 - 542)
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