Overleg:Holoceen: verschil tussen versies

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belangrijke mededeling
(belangrijke mededeling)
:::Hoe is het mogelijk. Nou maar wachten tot ie gesmolten of gesublimeerd is.
:::Voor het Holoceen gun ik mij de tijd niet, is niet interessant. Voorlopig heb ik in de echte wereld even mijn handen vol aan het Nederlandse Midden Pleistoceen.{{Gebruiker:PalaeoMal/Handtekening}} 12 jun 2009 22:53 (CEST)
 
 
== Belangrijke mededeling ==
Ik heb geen tijd om het volgende bericht in de tekst te verwerken maar dat moet dus wel gebeuren:
 
Formal subdivision of the Holocene Series/Epoch
It has been announced that the proposals for the subdivision of the Holocene Series/Epoch (11 700 years ago to the present day) into three stages/ages and their corresponding subseries/subepochs by the International Subcommission on Quaternary Stratigraphy (ISQS) (a subcommission of the International Commission on Stratigraphy – ICS) have been ratified unanimously by the International Union of Geological Sciences (IUGS). The subdivisions now formally defined are:
* 1. Greenlandian Stage/Age = Lower/Early Holocene Subseries/Subepoch
Boundary Stratotype (GSSP): NorthGRIP2 ice core, Greenland (coincident with the Holocene Series/Epoch GSSP, ratified 2008). Age: 11,700 yr b2k (before AD 2000).
* 2. Northgrippian Stage/Age = Middle/Mid-Holocene Subseries/Subepoch
Boundary Stratotype (GSSP): NorthGRIP1 ice core, Greenland. Global Auxiliary Stratotype: Gruta do Padre Cave speleothem, Brazil. Age: 8326 yr b2k.
* 3. Meghalayan Stage/Age = Upper/Late Holocene Subseries/Subepoch
Boundary stratotype (GSSP): Mawmluh Cave speleothem, Meghalaya, India. Global Auxiliary Stratotype, Mount Logan ice core, Canada. Age: 4250 yr b2k.
 
These divisions are now each defined by Global Stratotype Sections and Points (GSSPs), which means that they are fixed in time in sedimentary sequences. The terms Greenlandian Stage/Age, Northgrippian Stage/Age, Meghalayan Stage/Age, Lower/Early Holocene Subseries/Subepoch, Middle/Mid-Holocene Subseries/Subepoch and Late/Upper Holocene Subseries/Subepoch therefore have formal definitions and boundaries.
 
These definitions represent the first formal geological subdivision of the Holocene Series/Epoch, resulting from over a decade of labour by members of the joint ISQS (International Subcommission on Quaternary Stratigraphy) - INTIMATE Members Working Group (Integration of Ice-core, Marine and Terrestrial Records), led by Professor Mike Walker (University of Aberystwyth).
 
Secretary General ICS
Cambridge 26.6.18
 
 
{{Gebruiker:Tom Meijer/Handtekening}} 26 jun 2018 13:30 (CEST)
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