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                             Tremadocian ICS Stage
                     (Gasconadian, Tremadoc, Lianghekouan)
 
                     From 488.3 +/- 1.7 To 478.6 +/- 1.7 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:  Graptolite, lowest occurrence of Tetragraptus approximatus.
 
  Start Based On:  Gradstein, Ogg, Smith, _A Geologic Time Scale 2004_
  End Based On:  Gradstein, Ogg, Smith, _A Geologic Time Scale 2004_
 
  Global Stratotype Section and Point:  Green Point, western Newfoundland, 
     Canada
 
 -- Overlaps With --
  Australian Stage: Warendian/Lancefieldian (485 - 475)
  Australian Stage: Lancefieldian           (482 - 475)
 
 -- 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)
  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 --
  ICS Stage:            Arenig         (478.6 - 471.8)
  Chinese Stage:        Honghuayuanian (478.6 - 472)
  European Stage:       Moridunian     (478.6 - 475)
  North American Stage: Demingian      (478.6 - 475)
 
 -- Contains the Following Stages --
  Australian Stage: Datsonian   (488.3 - 485)
  Australian Stage: Warendian   (485 - 478.6)
  European Stage:   Cressagian  (488.3 - 486)
  European Stage:   Migneintian (486 - 478.6)
 

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.