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history:h_preh1 [2020/02/05 18:06]
gary1 [Cenozoic "recent life" era:]
history:h_preh1 [2020/05/30 09:04] (current)
gary1 [Hadean eon: 4,600-3,900 mya]
Line 24: Line 24:
     * Nectarian epoch     * Nectarian epoch
     * Early Imbrian epoch     * Early Imbrian epoch
 +    * tectonic plates form at least 3 billion years ago, but perhaps more like 4.4 billion years ago according to recent argon gas studies
 ==== Archeozoic eon: 3,900-2,500 mya==== ==== Archeozoic eon: 3,900-2,500 mya====
     * the Late Heavy Bombardment of meteors ends c3800 mya     * the Late Heavy Bombardment of meteors ends c3800 mya
history/h_preh1.txt ยท Last modified: 2020/05/30 09:04 by gary1