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                                Arenig ICS Stage
                           (Arenigian, Ordovician II)
 
                     From 478.6 +/- 1.7 To 471.8 +/- 1.6 Ma
 
  Start Defined By:  Graptolite, lowest occurrence of Tetragraptus 
     approximatus.
  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_
 
  Global Stratotype Section and Point:  Diabasbrottet quarry, Vdstergvtland, 
     southern Sweden
 
  Comment:  Official ICS name not yet decided.  Final Stage may not neccesary 
     coincide with the Arenig.
 
 -- Overlaps With --
  Australian Stage: Warendian/Lancefieldian (485 - 475)
  Australian Stage: Lancefieldian           (482 - 475)
  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:                Early Ordovician (488.3 - 471.8)
  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 --
  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 --
  Australian Stage:     Bendigonian    (475 - 473)
  Chinese Stage:        Honghuayuanian (478.6 - 472)
  Chinese Stage:        Dawanian       (472 - 471.8)
  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.