Irvingtonian North American Stage
 
                         From 1.806 +/- 0.005 To 0.3 Ma
 
  Start Defined By:  Just above top of magnetic polarity chronozone C2n 
     (Olduvai) and the extinction level of calcareous nannofossil Discoaster 
     brouweri (base Zone CN13).  Above are lowest occurrence of calcareous 
     nannofossil medium Gephyrocapsa spp. and extinction level of planktonic 
     foraminifer Globigerinoides extremus.
 
  Start Based On:  Gradstein, Ogg, Smith, _A Geologic Time Scale 2004_
 
 -- Overlaps With --
  ICS Stage:         Middle Pleistocene (0.781 - 0.126)
  European Stage:    Sicilian           (0.781 - 0.26)
  Japanese Stage:    Kechienjian        (1.9 - 1.5)
  New Zealand Stage: Nukumaruan         (1.96 - 1.1)
  New Zealand Stage: Castlecliffian     (1.1 - 0.01143)
  New Zealand Stage: Putikian           (0.48 - 0.01143)
 
 -- A Substage of --
  Eon:               Phanerozoic (542 - -5.5012e-005)
  Era:               Cenozoic    (65.5 - -5.5012e-005)
  Period:            Neogene     (23.03 - -5.5012e-005)
  Epoch:             Pleistocene (1.806 - 0.01143)
  Californian Stage: Wheelerian  (1.9 - 0.01143)
  Informal Period:   Pleistogene (1.806 - -5.5012e-005)
  Informal Sub-era:  Quaternary  (1.806 - -5.5012e-005)
 
 -- Preceeded By --
  Epoch:                Pliocene      (5.332 - 1.806)
  Sub-Epoch:            Late Pliocene (3.6 - 1.806)
  ICS Stage:            Gelasian      (2.588 - 1.806)
  Informal Sub-era:     Tertiary      (65.5 - 1.806)
  North American Stage: Blancan       (4.75 - 1.806)
 
 -- Followed By --
  North American Stage: Rancholabrean (0.3 - 0.01143)
 
 -- Contains the Following Stages --
  ICS Stage:         Early Pleistocene (1.806 - 0.781)
  Australian Stage:  Werrikooian       (1.806 - 1)
  Japanese Stage:    Yuzanjian         (1.5 - 0.75)
  New Zealand Stage: Okehuan           (1.1 - 0.48)
 

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.

© 2003-2005 GeoWhen Database
Prepared By Robert A. Rohde

This page was last updated on Tuesday, January 18, 2005.