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                               Cryogenian Period
 
                        From 850 +/- 0 To 630 +5/-30 Ma
 
  Start Defined By:  Fixed Date
  End Defined By:  Termination of Varanger (or Marinoan) glaciation, and 
     distinctive C-13 change.
 
  Start Based On:  Gradstein, Ogg, Smith, _A Geologic Time Scale 2004_
  End Based On:  Gradstein, Ogg, Smith, _A Geologic Time Scale 2004_
 
 -- Overlaps With --
  Chinese Stage:    Jinningian (1750 - 800)
  Chinese Stage:    Sinian     (800 - 542)
  General Stage:    Riphean    (1400 - 800)
  General Stage:    Vendian    (650 - 542)
  General Substage: Karatau    (1100 - 800)
 
 -- A Substage of --
  Time:                 Precambrian    (4567.17 - 542)
  Eon:                  Proterozoic    (2500 - 542)
  Era:                  Neoproterozoic (1000 - 542)
  Australian Stage:     Adelaidean     (1300 - 542)
  North American Stage: Hadrynian      (850 - 542)
  South African Stage:  Namibian       (900 - 542)
 
 -- Preceeded By --
  Period:               Tonian   (1000 - 850)
  North American Stage: Helikian (1600 - 850)
 
 -- Followed By --
  Period:        Ediacaran (630 - 542)
  General Stage: Wonokan   (630 - 570)
 
 -- Contains the Following Stages --
  General Stage: Sturtian  (800 - 650)
  General Stage: Varangian (650 - 630)
  General Stage: Smalfjord (650 - 640)
  General Stage: Mortesnes (640 - 630)
 

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.