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                            Ordovician III ICS Stage
 
                     From 471.8 +/- 1.6 To 468.1 +/- 1.6 Ma
 
  Start Defined By:  Conodont, potentially lowest occurrence of Protoprioniodus 
     aranda or of Baltoniodus triangularis.
  End Defined By:  Graptolite, lowest occurrence of Undulograptus 
     austrodentatus.
 
  Start Based On:  Gradstein, Ogg, Smith, _A Geologic Time Scale 2004_
  End Based On:  Gradstein, Ogg, Smith, _A Geologic Time Scale 2004_
 
  Comment:  Official ICS name not yet decided.
 
 -- 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)
  Epoch:                Middle Ordovician (471.8 - 460.9)
  General Stage:        Llanvirn          (471.8 - 464)
  North American Stage: White Rockian     (471.8 - 462)
 
 -- Preceeded By --
  Epoch:                Early Ordovician (488.3 - 471.8)
  ICS Stage:            Arenig           (478.6 - 471.8)
  Chinese Stage:        Dawanian         (472 - 471.8)
  European Stage:       Fennian          (473.5 - 471.8)
  North American Stage: Ibexian          (491 - 471.8)
  North American Stage: Cassinian        (473 - 471.8)
 
 -- Followed By --
  ICS Stage: Darriwilian (468.1 - 460.9)
 
 -- Contains the Following Stages --
  Australian Stage: Castlemanian (471 - 470)
  Australian Stage: Ypeenian     (470 - 468.1)
 

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.