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                             Llanvirn General Stage
                    (Llanvirnian, Guniutanian, Abereiddian)
 
                          From 471.8 +/- 1.6 To 464 Ma
 
  Start Defined By:  Conodont, potentially lowest occurrence of Protoprioniodus 
     aranda or of Baltoniodus triangularis.
 
  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.
 
  Comment:  Competing definition considers the Llanvirn to represent the entire 
     Middle Ordovician, in which case the Abereiddian and Llandeilian are 
     considered to be it's stages.
 
 -- Overlaps With --
  ICS Stage:        Darriwilian (468.1 - 460.9)
  Australian Stage: Chewtonian  (473 - 471)
 
 -- A Substage of --
  Eon:                  Phanerozoic       (542 - -5.5012e-005)
  Era:                  Paleozoic         (542 - 251)
  Period:               Ordovician        (488.3 - 443.7)
  Epoch:                Middle Ordovician (471.8 - 460.9)
  North American Stage: White Rockian     (471.8 - 462)
 
 -- Preceeded By --
  Epoch:                Early Ordovician (488.3 - 471.8)
  ICS Stage:            Arenig           (478.6 - 471.8)
  Chinese Stage:        Dawanian         (472 - 471.8)
  European Stage:       Fennian          (473.5 - 471.8)
  North American Stage: Ibexian          (491 - 471.8)
  North American Stage: Cassinian        (473 - 471.8)
 
 -- Followed By --
  General Stage: Llandeilo (464 - 460.9)
 
 -- Contains the Following Stages --
  ICS Stage:        Ordovician III (471.8 - 468.1)
  Australian Stage: Castlemanian   (471 - 470)
  Australian Stage: Ypeenian       (470 - 468.1)
 

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
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Geologic Timeline
(With Stages)

A-Z Stage List

Regional Information

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2003-2005 GeoWhen Database
Prepared By Robert A. Rohde


This page was last updated on Tuesday, January 18, 2005.