GSSPs approved by ICS and IUGS since Mondello (2002)

• Autorzy: Morton N.
• Konferencja: International Congress on the Jurassic System (7 ; 06-18.09.2006 ; Kraków, Poland]
• Języki publikacji: EN

Abstrakty

EN

The priority activity at present for the International Commission on Stratigraphy and its Systemrelated Subcommissions, including the Jurassic Subcommission, is completion of the programme of selection and ratification of Global Stratotype Sections and Points for all the Stages of the International Chronostratigraphic Scale. The deadline for completion set by IUGS is the next International Geological Congress in 2008. The current state of progress for the Subcommissions is highly variable – from having completed this process some years ago (and now having to consider revisions!) to being far away from completion. Hopefully there will be a “flood” of proposals over the next two years. The situation for the various Subcommissions will be summarised with illustration and comment on some examples of GSSP proposals that have been approved since I reviewed this subject in the last Jurassic Symposium in Mondello (2002). The situation for completion of the Stage GSSPs in the Jurassic is reasonably promising. Four of the eleven have been ratified, though only one since Mondello. Several others should be decided during the Kraków Congress, leading to postal/email votes within the Working Groups and submission of proposals to the Jurassic Subcommission. The 23 Voting Members of the Subcommission must study a proposal, make comments if appropriate and vote (usually by email) YES/NO/ABSTAIN. If a proposal is approved by a significant majority, the Working Groups have the opportunity to modify the proposal in the light of comments received before it is submitted to ICS. The same procedure follows before the proposal is submitted by ICS to IUGS for ratification. For the Jurassic the greatest problems concern the lower and upper boundaries of the Jurassic. Great progress has been made with the Triassic/Jurassic boundary and a GSSP proposal may be possible in the near future. However, there has been little progress with the Jurassic/Cretaceous boundary, technically the responsibility of the Cretaceous Subcommission.

Słowa kluczowe

EN

GSSPs; stages; system; proposals

• Wydawca: Państwowy Instytut Geologiczny - Państwowy Instytut Badawczy
• Czasopismo: Volumina Jurassica
• Rocznik: 2006
• Tom: Vol. 4, no. 1
• Strony: 195--196

Twórcy

autor

Morton N.

• Le Chardon, Quartier BrugiŻre, F-07200 Vogüé, France,