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                             Early Ordovician Epoch
                          (Lower Ordovician, Canadian)
 
                     From 488.3 +/- 1.7 To 471.8 +/- 1.6 Ma
 
  Start Defined By:  Conodont, lowest occurrence of Iapetognathus fluctivagus; 
     just above base of Cordylodus lindstromi conodont Zone.  Just below lowest 
     occurrence of planktonic graptolites.
  End Defined By:  Conodont, potentially lowest occurrence of Protoprioniodus 
     aranda or of Baltoniodus triangularis.
 
  Start Based On:  Gradstein, Ogg, Smith, _A Geologic Time Scale 2004_
  End Based On:  Gradstein, Ogg, Smith, _A Geologic Time Scale 2004_
 
 -- Overlaps With --
  Australian Stage: Chewtonian (473 - 471)
 
 -- A Substage of --
  Eon:                  Phanerozoic (542 - -5.5012e-005)
  Era:                  Paleozoic   (542 - 251)
  Period:               Ordovician  (488.3 - 443.7)
  North American Stage: Ibexian     (491 - 471.8)
 
 -- Preceeded By --
  Period:                  Cambrian      (542 - 488.3)
  Epoch:                   Late Cambrian (501 - 488.3)
  Australian Stage:        Payntonian    (491 - 488.3)
  Regional Stage:          Dolgellian    (492.5 - 488.3)
  Russian-Kazakhian Stage: Batyrbayan    (491.5 - 488.3)
 
 -- Followed By --
  Epoch:                Middle Ordovician (471.8 - 460.9)
  ICS Stage:            Ordovician III    (471.8 - 468.1)
  General Stage:        Llanvirn          (471.8 - 464)
  North American Stage: White Rockian     (471.8 - 462)
 
 -- Contains the Following Stages --
  ICS Stage:            Tremadocian             (488.3 - 478.6)
  ICS Stage:            Arenig                  (478.6 - 471.8)
  Australian Stage:     Datsonian               (488.3 - 485)
  Australian Stage:     Warendian               (485 - 478.6)
  Australian Stage:     Lancefieldian           (482 - 475)
  Australian Stage:     Warendian/Lancefieldian (485 - 475)
  Australian Stage:     Bendigonian             (475 - 473)
  Chinese Stage:        Honghuayuanian          (478.6 - 472)
  Chinese Stage:        Dawanian                (472 - 471.8)
  European Stage:       Cressagian              (488.3 - 486)
  European Stage:       Migneintian             (486 - 478.6)
  European Stage:       Moridunian              (478.6 - 475)
  European Stage:       Whitlandian             (475 - 473.5)
  European Stage:       Fennian                 (473.5 - 471.8)
  North American Stage: Demingian               (478.6 - 475)
  North American Stage: Jeffersonian            (475 - 473)
  North American Stage: Cassinian               (473 - 471.8)
 

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.