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                             Volgian Regional Stage
 
                           From 150.8 +/- 4 To 142 Ma
 
  Start Defined By:  Near base of Hybonoticeras hybonotum ammonite zone and 
     lowest occurrence of Gravesia genus, and the base of magnetic polarity 
     chronozone M22An.
 
  Start Based On:  Gradstein, Ogg, Smith, _A Geologic Time Scale 2004_
  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:            Berriasian       (145.5 - 140.2)
  Chinese Stage:        Suiningian       (161.2 - 149)
  European Epoch:       Neocomian        (145.5 - 130)
  Japanese Stage:       Kochian          (145.5 - 136.4)
  New Zealand Stage:    Ohauan           (152 - 150)
  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)
 
 -- Preceeded By --
  ICS Stage: Kimmeridgian (155.7 - 150.8)
 
 -- Followed By --
  Regional Stage: Ryzanian (142 - 136.5)
 
 -- Contains the Following Stages --
  ICS Stage:         Tithonian      (150.8 - 145.5)
  Chinese Stage:     Penglaizhenian (149 - 145.5)
  New Zealand Stage: Puaroan        (150 - 145.5)
  Regional Stage:    Portlandian    (146 - 142)
 

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.