Paleonet: International Geological Timescale [SEC=UNOFFICIAL]

John.Laurie at John.Laurie at
Wed Oct 3 07:27:26 UTC 2012

The Geological Timescale in the International Chronostratigraphic Chart on the ICS website ( differs from that in the two volume "A Geological Timescale" released at the IGC in August. While most of the numerical ages are the same, some differ considerably. Some of these are listed below:

Stage                ICS                   Book
Hauterivian        132.9                133.9
Barremian         129.4                130.8
Aptian               125.0                126.3
Carnian             235.0                237.0
Rhaetian           208.5                209.5
Olenekian          251.2                250.0

While these differences are not huge, they immediately cause problems when the object across an organisation like mine is to have a standard timescale to which everyone adheres, as the ICS timescale is the one everyone has on their wall. However, to generate many of our stratigraphic diagrams/charts we use Timescale Creator (which follows the book). Can we please have a consensus? If not, we will be back where we were in the 1990s when everyone had their own version.

Dr John R. Laurie
Energy Division
GPO Box 378
Canberra ACT 2601

Tel: (02) 6249 9412; Fax: (02) 6249 9980
E-mail: John.Laurie at
Street Address:
Cnr Jerrabomberra Avenue & Hindmarsh Drive
Symonston ACT 2609
ABN 80 091 799 039

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