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                         Niagaran North American Stage
 
                          From 438 To 421.3 +/- 2.6 Ma
 
  End Defined By:  Imprecise.  May be near base of Saetograptus 
     leintwardinensis graptolite zone.
 
  End Based On:  Gradstein, Ogg, Smith, _A Geologic Time Scale 2004_
 
 -- Overlaps With --
  Epoch:            Early Silurian (443.7 - 422.9)
  Epoch:            Late Silurian  (422.9 - 416)
  Sub-Epoch:        Llandovery     (443.7 - 428.2)
  Sub-Epoch:        Ludlow         (422.9 - 418.7)
  ICS Stage:        Aeronian       (439 - 436)
  Australian Stage: Keiloran       (443.7 - 433)
  Australian Stage: Melbournian    (428.2 - 416)
  Chinese Stage:    Miaogoalingian (422 - 418.7)
  Regional Stage:   Alexandrian    (443.7 - 436)
  Regional Stage:   Idwian         (439 - 437.5)
 
 -- A Substage of --
  Eon:    Phanerozoic (542 - -5.5012e-005)
  Era:    Paleozoic   (542 - 251)
  Period: Silurian    (443.7 - 416)
 
 -- Preceeded By --
  Chinese Stage:        Longmaxian (443.7 - 438)
  North American Stage: Medinan    (443.7 - 438)
 
 -- Followed By --
  ICS Stage:            Ludfordian (421.3 - 418.7)
  North American Stage: Cayugan    (421.3 - 416)
 
 -- Contains the Following Sub-Epochs --
  Sub-Epoch: Wenlock (428.2 - 422.9)
 

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.