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                         Demingian North American Stage
 
                          From 478.6 +/- 1.7 To 475 Ma
 
  Start Defined By:  Graptolite, lowest occurrence of Tetragraptus 
     approximatus.
 
  Start Based On:  Gradstein, Ogg, Smith, _A Geologic Time Scale 2004_
 
 -- A Substage of --
  Eon:                  Phanerozoic             (542 - -5.5012e-005)
  Era:                  Paleozoic               (542 - 251)
  Period:               Ordovician              (488.3 - 443.7)
  Epoch:                Early Ordovician        (488.3 - 471.8)
  ICS Stage:            Arenig                  (478.6 - 471.8)
  Australian Stage:     Lancefieldian           (482 - 475)
  Australian Stage:     Warendian/Lancefieldian (485 - 475)
  Chinese Stage:        Honghuayuanian          (478.6 - 472)
  North American Stage: Ibexian                 (491 - 471.8)
 
 -- Preceeded By --
  ICS Stage:        Tremadocian (488.3 - 478.6)
  Australian Stage: Warendian   (485 - 478.6)
  European Stage:   Migneintian (486 - 478.6)
 
 -- Followed By --
  Australian Stage:     Bendigonian  (475 - 473)
  European Stage:       Whitlandian  (475 - 473.5)
  North American Stage: Jeffersonian (475 - 473)
 
 -- Contains the Following Stages --
  European Stage: Moridunian (478.6 - 475)
 

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.