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                               Frasnian ICS Stage
                    (Sonyean, West Fallsian, Shetianqiaoan)
 
                     From 385.3 +/- 2.6 To 374.5 +/- 2.6 Ma
 
  Start Defined By:  Conodont, lowest occurrence of Ancyrodella rotundiloba 
     (defines base of Lower Polygnathus asymmetricus conodont Zone).
  End Defined By:  Just above major extinction horizon (Upper Kellwasser Event),
      including conodonts Ancyrodella and Ozarkodina and goniatites of 
     Gephuroceratidae and Beloceratidae.
 
  Start Based On:  Gradstein, Ogg, Smith, _A Geologic Time Scale 2004_
  End Based On:  Gradstein, Ogg, Smith, _A Geologic Time Scale 2004_
 
  Global Stratotype Section and Point:  Col du Puech de la Suque section, St. 
     Nazaire-de-Ladarez, SE Montagne Noir, southern France
 
 -- A Substage of --
  Eon:                  Phanerozoic   (542 - -5.5012e-005)
  Era:                  Paleozoic     (542 - 251)
  Period:               Devonian      (416 - 359.2)
  Epoch:                Late Devonian (385.3 - 359.2)
  North American Stage: Senecan       (388 - 370)
 
 -- Preceeded By --
  Epoch:         Middle Devonian (397.5 - 385.3)
  ICS Stage:     Givetian        (391.8 - 385.3)
  Chinese Stage: Dongganglingian (391.4 - 385.3)
 
 -- Followed By --
  ICS Stage: Famennian (374.5 - 359.2)
 

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.