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                                Aptian ICS Stage
                                   (Urgonian)
 
                         From 125 +/- 1 To 112 +/- 1 Ma
 
  Start Defined By:  Magnetic polarity chronozone, base of M0r.
  End Defined By:  Calcareous nannofossil, lowest occurrence of 
     Praediscosphaera columnata (= P. cretacea of some earlier studies), is one 
     potential marker.
 
  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: Mokoiwian (145.5 - 119)
  New Zealand Stage: Korangian (119 - 110)
 
 -- A Substage of --
  Eon:                  Phanerozoic      (542 - -5.5012e-005)
  Era:                  Mesozoic         (251 - 65.5)
  Period:               Cretaceous       (145.5 - 65.5)
  Epoch:                Early Cretaceous (145.5 - 99.6)
  European Epoch:       Gallic           (130 - 89.3)
  Japanese Stage:       Miyakoan         (125 - 96.6)
  North American Stage: Comanchean       (127 - 99.6)
 
 -- Preceeded By --
  ICS Stage:      Barremian (130 - 125)
  Japanese Stage: Aritan    (136.4 - 125)
 
 -- Followed By --
  ICS Stage: Albian (112 - 99.6)
 

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.