GeoWhen Database  

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                               Aalenian ICS Stage
 
                       From 175.6 +/- 2 To 171.6 +/- 3 Ma
 
  Start Defined By:  Ammonite, lowest occurrence of Leioceras genus.
  End Defined By:  Ammonite, lowest occurrence of the genus Hyperlioceras 
     (defines base of the Hyperlioceras discites Zone).
 
  Start Based On:  Gradstein, Ogg, Smith, _A Geologic Time Scale 2004_
  End Based On:  Gradstein, Ogg, Smith, _A Geologic Time Scale 2004_
 
  Global Stratotype Section and Point:  Fuentelsalz, central Spain
 
 -- A Substage of --
  Eon:               Phanerozoic     (542 - -5.5012e-005)
  Era:               Mesozoic        (251 - 65.5)
  Period:            Jurassic        (199.6 - 145.5)
  Epoch:             Middle Jurassic (175.6 - 161.2)
  Chinese Stage:     Xintiangouan    (175.6 - 167)
  New Zealand Stage: Uruoan          (188 - 169)
 
 -- Preceeded By --
  Epoch:     Early Jurassic (199.6 - 175.6)
  ICS Stage: Toarcian       (183 - 175.6)
 
 -- Followed By --
  ICS Stage: Bajocian (171.6 - 167.7)
 

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.