GeoWhen Database  

Introduction

Geologic Timeline
(No Stages)

Geologic Timeline
(With Stages)

A-Z Stage List

Regional Information

Download Files

  
                              Hettangian ICS Stage
 
                      From 199.6 +/- 0.6 To 196.5 +/- 1 Ma
 
  Start Defined By:  Near lowest occurrence of smooth Psiloceras planorbis 
     ammonite group.
  End Defined By:  Ammonite, lowest occurrence of arietitid genera Vermiceras 
     and Metophioceras.
 
  Start Based On:  Gradstein, Ogg, Smith, _A Geologic Time Scale 2004_
  End Based On:  Gradstein, Ogg, Smith, _A Geologic Time Scale 2004_
 
 -- A Substage of --
  Eon:               Phanerozoic    (542 - -5.5012e-005)
  Era:               Mesozoic       (251 - 65.5)
  Period:            Jurassic       (199.6 - 145.5)
  Epoch:             Early Jurassic (199.6 - 175.6)
  New Zealand Stage: Aratauran      (199.6 - 188)
 
 -- Preceeded By --
  Period:            Triassic      (251 - 199.6)
  Epoch:             Late Triassic (228 - 199.6)
  ICS Stage:         Rhaetian      (203.6 - 199.6)
  Chinese Stage:     Erqiaoan      (209 - 199.6)
  New Zealand Stage: Otapirian     (203 - 199.6)
 
 -- Followed By --
  ICS Stage: Sinemurian (196.5 - 189.6)
 

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.