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                       White Rockian North American Stage
 
                          From 471.8 +/- 1.6 To 462 Ma
 
  Start Defined By:  Conodont, potentially lowest occurrence of Protoprioniodus 
     aranda or of Baltoniodus triangularis.
 
  Start Based On:  Gradstein, Ogg, Smith, _A Geologic Time Scale 2004_
 
 -- Overlaps With --
  ICS Stage:        Darriwilian (468.1 - 460.9)
  Australian Stage: Chewtonian  (473 - 471)
  General Stage:    Llandeilo   (464 - 460.9)
 
 -- 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)
 
 -- 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 --
  North American Stage: Mohawkian (462 - 451)
 
 -- Contains the Following Stages --
  ICS Stage:        Ordovician III (471.8 - 468.1)
  Australian Stage: Ypeenian       (470 - 468.1)
  Australian Stage: Castlemanian   (471 - 470)
  General Stage:    Llanvirn       (471.8 - 464)
 

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.