GeoWhen Database  

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                           Portlandian Regional Stage
 
                               From 146 To 142 Ma
 
  Start Based On:  Gradstein and Ogg, "A Phanerozoic time scale", _Episodes_, 
     v.19, no.1&2., 1996.
  End Based On:  Gradstein and Ogg, "A Phanerozoic time scale", _Episodes_, 
     v.19, no.1&2., 1996.
 
 -- Overlaps With --
  Period:               Jurassic         (199.6 - 145.5)
  Period:               Cretaceous       (145.5 - 65.5)
  Epoch:                Late Jurassic    (161.2 - 145.5)
  Epoch:                Early Cretaceous (145.5 - 99.6)
  ICS Stage:            Tithonian        (150.8 - 145.5)
  ICS Stage:            Berriasian       (145.5 - 140.2)
  Chinese Stage:        Penglaizhenian   (149 - 145.5)
  European Epoch:       Neocomian        (145.5 - 130)
  Japanese Stage:       Kochian          (145.5 - 136.4)
  New Zealand Stage:    Puaroan          (150 - 145.5)
  New Zealand Stage:    Mokoiwian        (145.5 - 119)
  North American Stage: Coahulian        (145.5 - 127)
 
 -- A Substage of --
  Eon:            Phanerozoic (542 - -5.5012e-005)
  Era:            Mesozoic    (251 - 65.5)
  Regional Stage: Volgian     (150.8 - 142)
 
 -- Followed By --
  Regional Stage: Ryzanian (142 - 136.5)
 

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.