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                                Ediacaran Period
                        (Ediacarian, Neoproterozoic III)
 
                       From 630 +5/-30 To 542 +/- 0.3 Ma
 
  Start Defined By:  Termination of Varanger (or Marinoan) glaciation, and 
     distinctive C-13 change.
  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.
 
  Comment:  Exact date and boundary is grossly uncertain at present.  This 
     stage replaces "Neoproterozoic III".  Note that in paleontological usage, 
     the term "Ediacaran fauna" may be restricted to a particular group of 
     organisms representing only the most recent 1/3 to 1/2 of this period.
 
 -- A Substage of --
  Time:                 Precambrian    (4567.17 - 542)
  Eon:                  Proterozoic    (2500 - 542)
  Era:                  Neoproterozoic (1000 - 542)
  Australian Stage:     Adelaidean     (1300 - 542)
  Chinese Stage:        Sinian         (800 - 542)
  General Stage:        Vendian        (650 - 542)
  North American Stage: Hadrynian      (850 - 542)
  South African Stage:  Namibian       (900 - 542)
 
 -- Preceeded By --
  Period:        Cryogenian (850 - 630)
  General Stage: Varangian  (650 - 630)
  General Stage: Mortesnes  (640 - 630)
 
 -- 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 Stages --
  General Stage: Wonokan  (630 - 570)
  General Stage: Poundian (570 - 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

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2003-2005 GeoWhen Database
Prepared By Robert A. Rohde


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