Proterozoic Eon
From 2500 +/- 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: Wutaian (2600 - 2350)
-- A Substage of --
Time: Precambrian (4567.17 - 542)
-- Preceeded By --
Eon: Archean (3800 - 2500)
Era: Neoarchean (2800 - 2500)
South African Stage: Randian (3000 - 2500)
-- 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 Eras --
Era: Paleoproterozoic (2500 - 1600)
Era: Mesoproterozoic (1600 - 1000)
Era: Neoproterozoic (1000 - 542)
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