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                              Telychian ICS Stage
                                   (Ontarian)
 
                      From 436 +/- 1.9 To 428.2 +/- 2.3 Ma
 
  Start Defined By:  Brachiopods, just above extinction of Eocoelia intermedia 
     and below lowest succeeding species Eocoelia curtisi.  Near base of  
     Monograptus turriculatus graptolite zone.
  End Defined By:  Imprecise.  Between the base of acritarch biozone 5 and 
     extinction of conodont Pterospathodus amorphognathoides.  May be near base 
     of Cyrtograptus centrifugus graptolite zone.
 
  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:  Cefn Cerig road, Llandovery area, 
     south-central Wales, UK
 
 -- Overlaps With --
  Australian Stage: Keiloran    (443.7 - 433)
  Chinese Stage:    Shinulanian (438 - 433)
  Chinese Stage:    Xiushanian  (429 - 425.5)
 
 -- A Substage of --
  Eon:                  Phanerozoic    (542 - -5.5012e-005)
  Era:                  Paleozoic      (542 - 251)
  Period:               Silurian       (443.7 - 416)
  Epoch:                Early Silurian (443.7 - 422.9)
  Sub-Epoch:            Llandovery     (443.7 - 428.2)
  North American Stage: Niagaran       (438 - 421.3)
 
 -- Preceeded By --
  ICS Stage:      Aeronian    (439 - 436)
  Regional Stage: Alexandrian (443.7 - 436)
  Regional Stage: Fronian     (437.5 - 436)
 
 -- Followed By --
  Sub-Epoch:        Wenlock      (428.2 - 422.9)
  ICS Stage:        Sheinwoodian (428.2 - 426.2)
  Australian Stage: Melbournian  (428.2 - 416)
 
 -- Contains the Following Stages --
  Australian Stage: Eildonian (433 - 428.2)
  Chinese Stage:    Baishaean (433 - 429)
 

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

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2003-2005 GeoWhen Database
Prepared By Robert A. Rohde


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