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                                Ludlow Sub-Epoch
 
                     From 422.9 +/- 2.5 To 418.7 +/- 2.7 Ma
 
  Start Defined By:  Imprecise.  Just below base of local acritarch 
     Leptobrachion longhopense range zone.  May be near base of 
     Neodiversograptus nilssoni 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_
 
 -- Overlaps With --
  Chinese Stage:        Guandian (425.5 - 422)
  North American Stage: Niagaran (438 - 421.3)
  North American Stage: Cayugan  (421.3 - 416)
 
 -- A Substage of --
  Eon:              Phanerozoic   (542 - -5.5012e-005)
  Era:              Paleozoic     (542 - 251)
  Period:           Silurian      (443.7 - 416)
  Epoch:            Late Silurian (422.9 - 416)
  Australian Stage: Melbournian   (428.2 - 416)
 
 -- Preceeded By --
  Epoch:          Early Silurian (443.7 - 422.9)
  Sub-Epoch:      Wenlock        (428.2 - 422.9)
  ICS Stage:      Homerian       (426.2 - 422.9)
  Regional Stage: Gleedonian     (425.4 - 422.9)
 
 -- Followed By --
  Sub-Epoch: Pridoli (418.7 - 416)
 
 -- Contains the Following Stages --
  ICS Stage:     Gorstian       (422.9 - 421.3)
  ICS Stage:     Ludfordian     (421.3 - 418.7)
  Chinese Stage: Miaogoalingian (422 - 418.7)
 

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.