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                      Ayusokkanian Russian-Kazakhian Stage
 
                           From 501 +/- 2 To 494.5 Ma
 
  Start Defined By:  Trilobite, lowest occurrence of agnostoid Glyptagnostus 
     reticulatus.  Coincides with base of large positive carbon-isotope 
     excursion.
 
  Start Based On:  Gradstein, Ogg, Smith, _A Geologic Time Scale 2004_
 
 -- Overlaps With --
  Australian Stage: Idamean      (497 - 494)
  Regional Stage:   Festiniogian (496.8 - 492.5)
 
 -- A Substage of --
  Eon:                  Phanerozoic   (542 - -5.5012e-005)
  Era:                  Paleozoic     (542 - 251)
  Period:               Cambrian      (542 - 488.3)
  Epoch:                Late Cambrian (501 - 488.3)
  North American Stage: Marjuman      (504 - 494.5)
 
 -- Preceeded By --
  Epoch:                   Middle Cambrian (513 - 501)
  Australian Stage:        Boomerangian    (504 - 501)
  Chinese Stage:           Zhungxian       (505 - 501)
  Russian-Kazakhian Stage: Mayan           (502 - 501)
 
 -- Followed By --
  North American Stage:    Steptoan (494.5 - 493)
  Russian-Kazakhian Stage: Sakian   (494.5 - 493)
 
 -- Contains the Following Stages --
  ICS Stage:        Paibian      (501 - 496)
  Australian Stage: Mindyallan   (501 - 497)
  Regional Stage:   Maentwrogian (501 - 496.8)
 

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.