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                              Olenekian ICS Stage
                               (Yongningzhenian)
 
                      From 249.7 +/- 0.7 To 245 +/- 1.5 Ma
 
  Start Defined By:  Near lowest occurrence of Hedenstroemia or Meekoceras 
     gracilitatis ammonites, and of the conodont Neospathodus waageni.
  End Defined By:  Ammonite, near lowest occurrences of genera Japonites, 
     Paradanubites, and Paracrochordiceras; and of the conodont Chiosella 
     timorensis.
 
  Start Based On:  Gradstein, Ogg, Smith, _A Geologic Time Scale 2004_
  End Based On:  Gradstein, Ogg, Smith, _A Geologic Time Scale 2004_
 
 -- Overlaps With --
  New Zealand Stage: Malakovian (248 - 243)
 
 -- A Substage of --
  Eon:    Phanerozoic    (542 - -5.5012e-005)
  Era:    Mesozoic       (251 - 65.5)
  Period: Triassic       (251 - 199.6)
  Epoch:  Early Triassic (251 - 245)
 
 -- Preceeded By --
  ICS Stage:      Induan    (251 - 249.7)
  Regional Stage: Dienerian (250.4 - 249.7)
 
 -- Followed By --
  Epoch:          Middle Triassic (245 - 228)
  ICS Stage:      Anisian         (245 - 237)
  Regional Stage: Aegean          (245 - 243)
 
 -- Contains the Following Stages --
  Regional Stage: Smithian (249.7 - 247.4)
  Regional Stage: Spathian (247.4 - 245)
 

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.