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                              Late Triassic Epoch
                            (Upper Triassic, Keuper)
 
                       From 228 +/- 2 To 199.6 +/- 0.6 Ma
 
  Start Defined By:  Near first occurrence of the ammonoids Daxatina or 
     Trachyceras, and of the conodont Metapolygnathus polygnathiformis.
  End Defined By:  Near lowest occurrence of smooth Psiloceras planorbis 
     ammonite group.
 
  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: Kaihikuan (232 - 225)
 
 -- A Substage of --
  Eon:    Phanerozoic (542 - -5.5012e-005)
  Era:    Mesozoic    (251 - 65.5)
  Period: Triassic    (251 - 199.6)
 
 -- Preceeded By --
  Epoch:          Middle Triassic (245 - 228)
  ICS Stage:      Ladinian        (237 - 228)
  Regional Stage: Longobardian    (231.4 - 228)
 
 -- Followed By --
  Period:            Jurassic       (199.6 - 145.5)
  Epoch:             Early Jurassic (199.6 - 175.6)
  ICS Stage:         Hettangian     (199.6 - 196.5)
  New Zealand Stage: Aratauran      (199.6 - 188)
 
 -- Contains the Following Stages --
  ICS Stage:         Carnian       (228 - 216.5)
  ICS Stage:         Norian        (216.5 - 203.6)
  ICS Stage:         Rhaetian      (203.6 - 199.6)
  Chinese Stage:     Bananian      (228 - 219)
  Chinese Stage:     Huobachengian (219 - 209)
  Chinese Stage:     Erqiaoan      (209 - 199.6)
  New Zealand Stage: Oretian       (225 - 218)
  New Zealand Stage: Otamitan      (218 - 206)
  New Zealand Stage: Otapirian     (203 - 199.6)
  New Zealand Stage: Warepan       (206 - 203)
  Regional Stage:    Julian        (228 - 225)
  Regional Stage:    Tuvalian      (225 - 216.5)
  Regional Stage:    Lacinian      (216.5 - 216)
  Regional Stage:    Alaunian      (216 - 211)
  Regional Stage:    Sevatian      (211 - 203.6)
 

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.