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                         Ulsterian North American Stage
 
                      From 416 +/- 2.8 To 391.8 +/- 2.7 Ma
 
  Start Defined By:  Graptolite, lowest occurrence of Monograptus uniformis.
  End Defined By:  Conodont, lowest occurrence of Polygnathus hemiansatus, near 
     base of goniatite Maenioceras Stufe.
 
  Start Based On:  Gradstein, Ogg, Smith, _A Geologic Time Scale 2004_
  End Based On:  Gradstein, Ogg, Smith, _A Geologic Time Scale 2004_
 
 -- Overlaps With --
  Epoch:         Middle Devonian (397.5 - 385.3)
  Chinese Stage: Yingtangian     (397.5 - 391.4)
 
 -- A Substage of --
  Eon:    Phanerozoic (542 - -5.5012e-005)
  Era:    Paleozoic   (542 - 251)
  Period: Devonian    (416 - 359.2)
 
 -- Preceeded By --
  Period:               Silurian      (443.7 - 416)
  Epoch:                Late Silurian (422.9 - 416)
  Sub-Epoch:            Pridoli       (418.7 - 416)
  Australian Stage:     Melbournian   (428.2 - 416)
  North American Stage: Cayugan       (421.3 - 416)
 
 -- Followed By --
  ICS Stage:            Givetian (391.8 - 385.3)
  North American Stage: Erian    (391.8 - 388)
 
 -- Contains the Following Epochs --
  Epoch: Early Devonian (416 - 397.5)
 

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.