|system||series||step||≈ age ( mya )|
The Chattium (usually shortened to Chatt in German usage ) is the upper of the two chronostratigraphic stages of the Oligocene , the uppermost series of the Paleogene . The Chattium is therefore also equated with the Upper Oligocene . The corresponding geochronological age covers the period from about 28.1 to about 23.03 million years ago. The Chattium follows the Rupelium and is replaced by the Aquitanium , the lowest level of the Miocene and Neogene .
Naming and history
The stage is named after the Germanic tribe of Chatti . The original type locality is near Kassel . The stage and name were proposed by the Austrian geologist and paleontologist Theodor Fuchs in 1894.
Definition and GSSP
The base of the stage is primarily marked by the last relatively frequent occurrence ( English highest common occurrence , HCO) of the foraminifera species Chiloguembelina cubensis in the overlapping area of calcified nannofossil zone NP24 and dinoflagellate cysts zone Dbi. The corresponding internationally binding reference profile ( Global Stratotype Section and Point , GSSP) is located on the south- eastern slope of Monte Cagnero in the Marche region in central Italy . Secondary markers are the last and last relatively frequent occurrence of the coccoliths Sphenolithus predistentus or S. distentus as well as an interval in which the cold water- indicating dinoflagellate cyst Svalbardella cooksoniae is frequent. All of these markers lie within the magnetostratigraphic Chronozone C9n.
The end of the stage is characterized by the base of the magnetostratigraphic chronozone C6Cn.2n, the first appearance of the foraminifera species Paragloborotalia kugleri and the extinction of the calcareous nannoplankton species Reticulofenestra bisecta (base of the calcareous nannofossil zone NN1).
- Theodor Fuchs : Tertian fossils from the coal-bearing Miocaen deposits in the vicinity of Krapina and Radaboj and about the position of the so-called "Aquitaine level". In: Communications from the yearbook of the Royal Hungarian Geological Institute. 10, 5, 1894, , pp. 163-175.
- Felix M. Gradstein, Jim Ogg, Jim Smith, Alan Smith (Eds.): A Geologic timescale 2004. 3rd edition. Cambridge University Press, Cambridge et al. 2004, ISBN 0-521-78673-8 .
- Hans Murawski, Wilhelm Meyer: Geological dictionary. 10th, revised and expanded edition. Enke Verlag, Stuttgart 1998, ISBN 3-432-84100-0 .
- German Stratigraphic Commission (Ed.): Stratigraphische Tisch von Deutschland 2002 . Potsdam 2002, ISBN 3-00-010197-7 . (PDF; 6.57 MB)
- Commission for the paleontological and stratigraphic research of Austria of the Austrian Academy of Sciences (Ed.): The Stratigraphic Table of Austria (sedimentary layer sequences). (PDF; 381 kB)
- International Chronostratigraphic Chart 2012 (PDF)
- Chattian stratotype - GSSP for Chattian Stage. Web presence of the International Subcommission on Paleogene Stratigraphy (ISPS), accessed on September 22, 2017