GeoWhen Database  

Introduction

Geologic Timeline
(No Stages)

Geologic Timeline
(With Stages)

A-Z Stage List

Regional Information

Download Files

  
                             Late Ordovician Epoch
                        (Upper Ordovician, Bala, Balan)
 
                     From 460.9 +/- 1.6 To 443.7 +/- 1.5 Ma
 
  Start Defined By:  Graptolite, lowest occurrence of Nemagraptus gracilis.
  End Defined By:  Graptolites, lowest occurrences of Parakidograptus 
     acuminatus and Akidograptus ascensus.
 
  Start Based On:  Gradstein, Ogg, Smith, _A Geologic Time Scale 2004_
  End Based On:  Gradstein, Ogg, Smith, _A Geologic Time Scale 2004_
 
 -- Overlaps With --
  North American Stage: Mohawkian (462 - 451)
 
 -- A Substage of --
  Eon:    Phanerozoic (542 - -5.5012e-005)
  Era:    Paleozoic   (542 - 251)
  Period: Ordovician  (488.3 - 443.7)
 
 -- Preceeded By --
  Epoch:         Middle Ordovician (471.8 - 460.9)
  ICS Stage:     Darriwilian       (468.1 - 460.9)
  General Stage: Llandeilo         (464 - 460.9)
 
 -- 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:            Ordovician V  (460.9 - 455.8)
  ICS Stage:            Ordovician VI (455.8 - 445.6)
  ICS Stage:            Hirnantian    (445.6 - 443.7)
  Australian Stage:     Gisbornian    (460.9 - 456)
  Australian Stage:     Eastonian     (456 - 450)
  Australian Stage:     Bolindian     (450 - 443.7)
  Chinese Stage:        Baotan        (460.9 - 454.5)
  Chinese Stage:        Linxiangian   (454.5 - 449)
  European Stage:       Aurelucian    (460.9 - 457)
  European Stage:       Burrellian    (457 - 455)
  European Stage:       Cheneyan      (455 - 452)
  European Stage:       Streffordian  (452 - 449)
  European Stage:       Pusgillian    (449 - 447.5)
  European Stage:       Cautleyan     (447.5 - 446.5)
  European Stage:       Rawtheyan     (446.5 - 445.6)
  General Stage:        Caradoc       (460.9 - 449)
  General Stage:        Ashgill       (449 - 443.7)
  North American Stage: Cincinnatian  (451 - 443.7)
  Regional Stage:       Longvillian   (457 - 455)
  Regional Stage:       Shermanian    (457 - 454)
  Regional Stage:       Soudleyan     (458 - 457)
  Regional Stage:       Harnagian     (459 - 458)
  Regional Stage:       Costonian     (460.9 - 459)
  Regional Stage:       Marshbrookian (455 - 454)
  Regional Stage:       Edenian       (454 - 449)
  Regional Stage:       Actonian      (454 - 453)
  Regional Stage:       Mayvillian    (453 - 447.5)
  Regional Stage:       Onnian        (453 - 449)
  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.