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                         Boomerangian Australian Stage
 
                            From 504 To 501 +/- 2 Ma
 
  End Defined By:  Trilobite, lowest occurrence of agnostoid Glyptagnostus 
     reticulatus.  Coincides with base of large positive carbon-isotope 
     excursion.
 
  End Based On:  Gradstein, Ogg, Smith, _A Geologic Time Scale 2004_
 
 -- Overlaps With --
  Russian-Kazakhian Stage: Amgan (513 - 502)
 
 -- A Substage of --
  Eon:                  Phanerozoic     (542 - -5.5012e-005)
  Era:                  Paleozoic       (542 - 251)
  Period:               Cambrian        (542 - 488.3)
  Epoch:                Middle Cambrian (513 - 501)
  Chinese Stage:        Zhungxian       (505 - 501)
  North American Stage: Marjuman        (504 - 494.5)
 
 -- Preceeded By --
  Australian Stage:     Undillian (506 - 504)
  North American Stage: Delamaran (512 - 504)
 
 -- Followed By --
  Epoch:                   Late Cambrian (501 - 488.3)
  ICS Stage:               Paibian       (501 - 496)
  Australian Stage:        Mindyallan    (501 - 497)
  Regional Stage:          Maentwrogian  (501 - 496.8)
  Russian-Kazakhian Stage: Ayusokkanian  (501 - 494.5)
 
 -- Contains the Following Stages --
  Russian-Kazakhian Stage: Mayan (502 - 501)
 

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.