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                           Ypeenian Australian Stage
 
                          From 470 To 468.1 +/- 1.6 Ma
 
  End Defined By:  Graptolite, lowest occurrence of Undulograptus 
     austrodentatus.
 
  End Based On:  Gradstein, Ogg, Smith, _A Geologic Time Scale 2004_
 
 -- 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)
  ICS Stage:            Ordovician III    (471.8 - 468.1)
  General Stage:        Llanvirn          (471.8 - 464)
  North American Stage: White Rockian     (471.8 - 462)
 
 -- Preceeded By --
  Australian Stage: Castlemanian (471 - 470)
 
 -- Followed By --
  ICS Stage: Darriwilian (468.1 - 460.9)
 

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.