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                                   Hadean Eon
                               (Priscoan, Azoic)
 
                        From 4567.17 +/- 0.7 To 3800 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.
 
  Comment:  Start date reflects earliest CAIs formation, at the birth of the 
     solar system.  The Hadean is not officially recognized ICS nomenclature.
 
 -- Overlaps With --
  South African Stage: Swazian (4000 - 3000)
 
 -- A Substage of --
  Time: Precambrian (4567.17 - 542)
 
 -- Followed By --
  Eon:            Archean   (3800 - 2500)
  Era:            Eoarchean (3800 - 3600)
  Chinese Stage:  Qianxin   (3800 - 3400)
  European Stage: Isuan     (3800 - 3500)
 
 -- Contains the Following Stages --
  General Stage: Cryptic       (4567.17 - 4150)
  General Stage: Basin Groups  (4150 - 3975)
  General Stage: Nectarian     (3975 - 3900)
  General Stage: Early Imbrian (3900 - 3800)
 

This page was automatically generated from the GeoWhen database (version 1.1.0).  Please read the introduction regarding the accuracy and reliability of this information.  Comments, corrections, and additions can be sent to geowhen@robertrohde.com.  References to published academic literature are preferred.

Introduction

Geologic Timeline
(No Stages)

Geologic Timeline
(With Stages)

A-Z Stage List

Regional Information

Download Files


2003-2005 GeoWhen Database
Prepared By Robert A. Rohde


This page was last updated on Tuesday, January 18, 2005.