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                                Precambrian Time
                            (Cryptozoic, Primordial)
 
                     From 4567.17 +/- 0.7 To 542 +/- 0.3 Ma
 
  Start Defined By:  Formation of Earth
  End Defined By:  Trace fossil, lowest occurrence of Treptichnus (Phycodes) 
     pedum.  Near base of negative carbon-isotope excursion.
 
  Start Based On:  Amelin, Krot, Hutcheon, and Ulyanov, "Lead Isotopic Ages of 
     Chondrules and Calcium-Aluminum-Rich Inclusions", _Science_, Sept. 6, 
     2002.
  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.
 
  Comment:  Cryptozoic is sometimes identified as excluding the Hadean
 
 -- 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 Eons --
  Eon: Hadean      (4567.17 - 3800)
  Eon: Archean     (3800 - 2500)
  Eon: Proterozoic (2500 - 542)
 

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.