Sacmarium
system | series | step | ≈ age ( mya ) |
---|---|---|---|
higher | higher | higher | younger |
Perm | Lopingium | Changhsingium | 251.9 ⬍ 254.2 |
Wuchiapingium | 254.2 ⬍ 259.9 |
||
Guadalupium | Capitanium | 259.9 ⬍ 265.1 |
|
Wordium | 265.1 ⬍ 268.8 |
||
Roadium | 268.8 ⬍ 272.3 |
||
Cisuralium | Kungurium | 272.3 ⬍ 279.3 |
|
Artinskium | 279.3 ⬍ 290.1 |
||
Sacmarium | 290.1 ⬍ 295.5 |
||
Asselium | 295.5 ⬍ 298.9 |
||
deeper | deeper | deeper | older |
The sakmarian is in the geological a chronostratigraphic stage of the Permian or the Cisuralium . Expressed in absolute terms ( geochronologically ), the level ranges from about 295.5 million years to about 290.1 million years. The Sacmarium follows the Asselium and is replaced by the Artinskium .
Naming and history
The Sakmarium is named after the tributary Sakmara of the Urals in the Ural Mountains . The stage and name were originally proposed by Alexander Karpinski in 1874 as a sub-unit of the Artinskium .
Definition and GSSP
The beginning of the sacmarium was placed at the base of the first appearance of the conodont species Streptognathodus postfusus . The end of the stage is reached with the first appearance of the conodont species Sweetognathus whitei and Mesogondolella bisselli . A GSSP (globally valid type locality and type profile) has not yet been ratified.
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)