Cryptic General Stage
From 4567.17 +/- 0.7 To 4150 Ma
Start Defined By: Formation of Earth
Start Based On: Amelin, Krot, Hutcheon, and Ulyanov, "Lead Isotopic Ages of
Chondrules and Calcium-Aluminum-Rich Inclusions", _Science_, Sept. 6,
2002.
-- A Substage of --
Time: Precambrian (4567.17 - 542)
Eon: Hadean (4567.17 - 3800)
-- Followed By --
General Stage: Basin Groups (4150 - 3975)
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