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                           Early Oligocene Sub-Epoch
                               (Lower Oligocene)
 
                      From 33.9 +/- 0.1 To 28.4 +/- 0.1 Ma
 
  Start Defined By:  Planktonic foraminifer, extinction of Hantkenina.
  End Defined By:  Planktonic foraminifer, extinction of Chiloguembelina (base 
     Zone P21b).
 
  Start Based On:  Gradstein, Ogg, Smith, _A Geologic Time Scale 2004_
  End Based On:  Gradstein, Ogg, Smith, _A Geologic Time Scale 2004_
 
 -- Overlaps With --
  Australian Stage:     Aldingian  (36 - 33)
  Australian Stage:     Janjukian  (30 - 27.5)
  Californian Stage:    Refugian   (35 - 33.5)
  Californian Stage:    Zemorrian  (33.5 - 22)
  North American Stage: Chadronian (37 - 33.5)
  North American Stage: Arikareean (30.5 - 19)
 
 -- A Substage of --
  Eon:               Phanerozoic (542 - -5.5012e-005)
  Era:               Cenozoic    (65.5 - -5.5012e-005)
  Period:            Paleogene   (65.5 - 23.03)
  Epoch:             Oligocene   (33.9 - 23.03)
  Informal Sub-era:  Tertiary    (65.5 - 1.806)
  New Zealand Stage: Whaingaroan (33.9 - 28)
 
 -- Preceeded By --
  Epoch:     Eocene      (55.8 - 33.9)
  Sub-Epoch: Late Eocene (37.2 - 33.9)
  ICS Stage: Priabonian  (37.2 - 33.9)
 
 -- Followed By --
  Sub-Epoch: Late Oligocene (28.4 - 23.03)
  ICS Stage: Chattian       (28.4 - 23.03)
 
 -- Contains the Following Stages --
  ICS Stage:            Rupelian  (33.9 - 28.4)
  North American Stage: Orellan   (33.5 - 32)
  North American Stage: Whitneyan (32 - 30.5)
 

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.