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                             Middle Devonian Epoch
                                  (Cazenovian)
 
                     From 397.5 +/- 2.7 To 385.3 +/- 2.6 Ma
 
  Start Defined By:  Conodont, lowest occurrence of Polygnathus costatus 
     partitus; major faunal turnover.
  End Defined By:  Conodont, lowest occurrence of Ancyrodella rotundiloba 
     (defines base of Lower Polygnathus asymmetricus conodont Zone).
 
  Start Based On:  Gradstein, Ogg, Smith, _A Geologic Time Scale 2004_
  End Based On:  Gradstein, Ogg, Smith, _A Geologic Time Scale 2004_
 
 -- Overlaps With --
  North American Stage: Ulsterian (416 - 391.8)
  North American Stage: Senecan   (388 - 370)
 
 -- A Substage of --
  Eon:    Phanerozoic (542 - -5.5012e-005)
  Era:    Paleozoic   (542 - 251)
  Period: Devonian    (416 - 359.2)
 
 -- Preceeded By --
  Epoch:     Early Devonian (416 - 397.5)
  ICS Stage: Emsian         (407 - 397.5)
 
 -- Followed By --
  Epoch:     Late Devonian (385.3 - 359.2)
  ICS Stage: Frasnian      (385.3 - 374.5)
 
 -- Contains the Following Stages --
  ICS Stage:            Eifelian        (397.5 - 391.8)
  ICS Stage:            Givetian        (391.8 - 385.3)
  Chinese Stage:        Yingtangian     (397.5 - 391.4)
  Chinese Stage:        Dongganglingian (391.4 - 385.3)
  North American Stage: Erian           (391.8 - 388)
 

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.