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                              Ludfordian ICS Stage
 
                     From 421.3 +/- 2.6 To 418.7 +/- 2.7 Ma
 
  Start Defined By:  Imprecise.  May be near base of Saetograptus 
     leintwardinensis graptolite zone.
  End Defined By:  Graptolite, lowest occurrence of Monograptus parultimus.
 
  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:  Sunnyhill Quarry, Ludlow, Shropshire, 
     southwest England, UK
 
 -- A Substage of --
  Eon:                  Phanerozoic    (542 - -5.5012e-005)
  Era:                  Paleozoic      (542 - 251)
  Period:               Silurian       (443.7 - 416)
  Epoch:                Late Silurian  (422.9 - 416)
  Sub-Epoch:            Ludlow         (422.9 - 418.7)
  Australian Stage:     Melbournian    (428.2 - 416)
  Chinese Stage:        Miaogoalingian (422 - 418.7)
  North American Stage: Cayugan        (421.3 - 416)
 
 -- Preceeded By --
  ICS Stage:            Gorstian (422.9 - 421.3)
  North American Stage: Niagaran (438 - 421.3)
 
 -- Followed By --
  Sub-Epoch: Pridoli (418.7 - 416)
 

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.