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                          Ibexian North American Stage
 
                          From 491 To 471.8 +/- 1.6 Ma
 
  End Defined By:  Conodont, potentially lowest occurrence of Protoprioniodus 
     aranda or of Baltoniodus triangularis.
 
  End Based On:  Gradstein, Ogg, Smith, _A Geologic Time Scale 2004_
 
 -- Overlaps With --
  Period:                  Cambrian      (542 - 488.3)
  Period:                  Ordovician    (488.3 - 443.7)
  Epoch:                   Late Cambrian (501 - 488.3)
  Australian Stage:        Chewtonian    (473 - 471)
  Regional Stage:          Dolgellian    (492.5 - 488.3)
  Russian-Kazakhian Stage: Batyrbayan    (491.5 - 488.3)
 
 -- A Substage of --
  Eon: Phanerozoic (542 - -5.5012e-005)
  Era: Paleozoic   (542 - 251)
 
 -- Preceeded By --
  North American Stage: Sunwaptan (493 - 491)
 
 -- 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 Epochs --
  Epoch: Early Ordovician (488.3 - 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.