Geologic Time Scale 2004 – why, how, and where next!

摘要: A Geologic Time Scale (GTS2004) is presented that integrates currently available stratigraphic and geochronologic information. The construction of 2004 incorporated different techniques depending on the data within each interval. Construction involved a large number specialists, including contributions by past present subcommissions officers International Commission Stratigraphy (ICS), geochemists working with radiogenic stable isotopes, stratigraphers using diverse tools from traditional fossils to astronomical cycles database programming, geomathematicians. Anticipated advances during next four years include formalization all Phanerozoic stage boundaries, orbital tuning extended into Cretaceous, standardization radiometric dating methods resolving poorly dated intervals, detailed integrated stratigraphy for periods, on-line databases tools. geochronological science community are focusing these issues. version planned 2008, concurrent completion boundary-stratotype (GSSP) definitions international stages.