Kasimovium
| system | Subsystem | step | ≈ age ( mya ) |
|---|---|---|---|
| higher | higher | higher | younger |
| Carbon | Pennsylvania | Gzhelium | 298.9 ⬍ 303.7 |
| Kasimovium | 303.7 ⬍ 307 |
||
| Moskovium | 307 ⬍ 315.2 |
||
| Bashkirium | 315.2 ⬍ 323.2 |
||
| Mississippium | Serpukhovium | 323.2 ⬍ 330.9 |
|
| Visa | 330.9 ⬍ 346.7 |
||
| Tournaisium | 346.7 ⬍ 358.9 |
||
| deeper | deeper | deeper | older |
The Kasimovian is the third chronostratigraphic stage of the Pennsylvania ( carbon ) in the history of the earth . Geochronologically, the stage covers the period from about 307 million to about 303.7 million years. The Kasimovium follows the Moskovium and is replaced by the Gzhelium , the lowest level of the Permian .
Naming and history
The Kasimovium is named after the Russian city of Kassimow . In 1926 Boris Danschin (1891–1941) separated this time interval from the upper part of the Moskovium stage as the “Teguliferina horizon”, later named the Kasimov horizon (Danschin, 1947; posthumously). Georgij I. Teodorovic (1949) finally named this section as the Kasimov stage.
Definition and GSSP
The lower limit of the Kasimovian lies near the base of the Obsoletes obsoletes - Protriticites pseudomontiparus - Fusulinen zone, or the first appearance of the ammonite genus Parashumardites . The upper limit is close to the first occurrence of the fusuline genera Daixina , Jigulites and Rugosofusulina , or the first occurrence of the conodont species Streptognathodus zethu . A reference profile (GSSP = Global Stratotype Section and Point) for the basis of the Kasimovium has not yet been established.
Breakdown
The Kasimovium is divided into three conodont zones:
- Idiognathodus toretzianus zone
- Idiognathodus sagittatus zone
- Streptognathodus excelsus / Streptognathodus makhlinae zone
Individual evidence
- ↑ M. Menning, AS Alekseev, BI Chuvashov, VI Davydov, F.-X. Devuyst, HC Forke, TA Grunt, L. Hance, PH Heckel, NG Izokh, Y.-G. Jin, PJ Jones, GV Kotlyar, HW Kozur, TI Nemyrovska, JW Schneider, X.-D. Wang, K. Weddige, D. Weyer, and DM Work: Global time scale and regional stratigraphic reference scales of Central and West Europe, East Europe, Tethys, South China, and North America as used in the Devonian – Carboniferous – Permian Correlation Chart 2003 (DCP 2003). Palaeogeography, Palaeoclimatology, Palaeoecology, 240 (1-2): 318-372, Amsterdam 2006
literature
- Felix Gradstein, Jim Ogg, Jim & Alan Smith: A Geologic timescale. Cambridge University Press 2004, ISBN 978-0-521-78673-7 .
- Hans Murawski & Wilhelm Meyer: Geological dictionary . 10., rework. u. exp. Ed., 278 pages, Enke Verlag, Stuttgart 1998, ISBN 3-432-84100-0 .
Web links
- German Stratigraphic Commission, Manfred Menning (Hrsg.): Stratigraphische Tisch von Deutschland 2002 . Potsdam 2002, ISBN 3-00-010197-7 (1 sheet, Stratigraphie.de [PDF; 6.6 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). Vienna 2004 (PDF; 376 kB)
- International Chronostratigraphic Chart 2012 (PDF)