GeoWhen Database  

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Geologic Timeline
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                             Fronian Regional Stage
 
                          From 437.5 To 436 +/- 1.9 Ma
 
  End Defined By:  Brachiopods, just above extinction of Eocoelia intermedia 
     and below lowest succeeding species Eocoelia curtisi.  Near base of  
     Monograptus turriculatus graptolite zone.
 
  End Based On:  Gradstein, Ogg, Smith, _A Geologic Time Scale 2004_
 
 -- 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)
  ICS Stage:            Aeronian       (439 - 436)
  Australian Stage:     Keiloran       (443.7 - 433)
  Chinese Stage:        Shinulanian    (438 - 433)
  North American Stage: Niagaran       (438 - 421.3)
  Regional Stage:       Alexandrian    (443.7 - 436)
 
 -- Preceeded By --
  Regional Stage: Idwian (439 - 437.5)
 
 -- Followed By --
  ICS Stage: Telychian (436 - 428.2)
 

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.