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                             Ashgill General Stage
                                  (Wufengian)
 
                          From 449 To 443.7 +/- 1.5 Ma
 
  End Defined By:  Graptolites, lowest occurrences of Parakidograptus 
     acuminatus and Akidograptus ascensus.
 
  Start Based On:  Gradstein and Ogg, "A Phanerozoic time scale", _Episodes_, 
     v.19, no.1&2., 1996.
  End Based On:  Gradstein, Ogg, Smith, _A Geologic Time Scale 2004_
 
 -- Overlaps With --
  ICS Stage:      Ordovician VI (455.8 - 445.6)
  Regional Stage: Mayvillian    (453 - 447.5)
 
 -- A Substage of --
  Eon:                  Phanerozoic     (542 - -5.5012e-005)
  Era:                  Paleozoic       (542 - 251)
  Period:               Ordovician      (488.3 - 443.7)
  Epoch:                Late Ordovician (460.9 - 443.7)
  Australian Stage:     Bolindian       (450 - 443.7)
  North American Stage: Cincinnatian    (451 - 443.7)
 
 -- Preceeded By --
  Chinese Stage:  Linxiangian  (454.5 - 449)
  European Stage: Streffordian (452 - 449)
  General Stage:  Caradoc      (460.9 - 449)
  Regional Stage: Edenian      (454 - 449)
  Regional Stage: Onnian       (453 - 449)
 
 -- Followed By --
  Period:               Silurian       (443.7 - 416)
  Epoch:                Early Silurian (443.7 - 422.9)
  Sub-Epoch:            Llandovery     (443.7 - 428.2)
  ICS Stage:            Rhuddanian     (443.7 - 439)
  Australian Stage:     Keiloran       (443.7 - 433)
  Chinese Stage:        Longmaxian     (443.7 - 438)
  North American Stage: Medinan        (443.7 - 438)
  Regional Stage:       Alexandrian    (443.7 - 436)
 
 -- Contains the Following Stages --
  ICS Stage:      Hirnantian  (445.6 - 443.7)
  European Stage: Pusgillian  (449 - 447.5)
  European Stage: Cautleyan   (447.5 - 446.5)
  European Stage: Rawtheyan   (446.5 - 445.6)
  Regional Stage: Richmondian (449 - 445.6)
 

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.