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                           Richmondian Regional Stage
 
                          From 449 To 445.6 +/- 1.5 Ma
 
  End Defined By:  Potentially at base of the Normalograptus extraordinarius-N. 
     ojsuensis graptolite biozone.
 
  Start Based On:  Gradstein and Ogg, "A Phanerozoic time scale", _Episodes_, 
     v.19, no.1&2., 1996.
  End Based On:  Gradstein, Ogg, Smith, _A Geologic Time Scale 2004_
 
 -- Overlaps With --
  Regional Stage: Mayvillian (453 - 447.5)
 
 -- A Substage of --
  Eon:                  Phanerozoic     (542 - -5.5012e-005)
  Era:                  Paleozoic       (542 - 251)
  Period:               Ordovician      (488.3 - 443.7)
  Epoch:                Late Ordovician (460.9 - 443.7)
  ICS Stage:            Ordovician VI   (455.8 - 445.6)
  Australian Stage:     Bolindian       (450 - 443.7)
  General Stage:        Ashgill         (449 - 443.7)
  North American Stage: Cincinnatian    (451 - 443.7)
 
 -- Preceeded By --
  Chinese Stage:  Linxiangian  (454.5 - 449)
  European Stage: Streffordian (452 - 449)
  General Stage:  Caradoc      (460.9 - 449)
  Regional Stage: Edenian      (454 - 449)
  Regional Stage: Onnian       (453 - 449)
 
 -- Followed By --
  ICS Stage: Hirnantian (445.6 - 443.7)
 
 -- Contains the Following Stages --
  European Stage: Pusgillian (449 - 447.5)
  European Stage: Cautleyan  (447.5 - 446.5)
  European Stage: Rawtheyan  (446.5 - 445.6)
 

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.