Fortunium
| system | series | step | ≈ age ( mya ) |
|---|---|---|---|
| higher | higher | higher | younger |
| Cambrian | Furongium | 10th stage | 485.4 ⬍ 489.5 |
| Jiangshanium | 489.5 ⬍ 494 |
||
| Paibium | 494 ⬍ 497 |
||
| Miaolingium | Guzhangium | 497 ⬍ 500.5 |
|
| Drumium | 500.5 ⬍ 504.5 |
||
| Wuliuum | 504.5 ⬍ 509 |
||
| 2nd series | 4th stage | 509 ⬍ 514 |
|
| 3rd stage | 514 ⬍ 521 |
||
| Terreneuvium | 2nd stage | 521 ⬍ 529 |
|
| Fortunium | 529 ⬍ 541 |
||
| deeper | |||
The fortunian is in the Earth's lower stratigraphic level of terreneuvian - series and the Cambrian system's. The stage begins geochronologically around 541 million years; the upper limit is around 529 million years. The Fortunium is overlaid by an as yet unnamed stage ("Stage 2") of the Cambrian. It follows on from the Ediacarian system of the Neoproterozoic Arathem (" Precambrian "). This is not divided into series or stages.
Naming and history
The series was named after the place Fortune Head , near which the GSSP is located.
Definition and GSSP
The beginning of the Fortunium (and thus also the Terreneuvium series and the Cambrian as well as the Paleozoic and Phanerozoic in general) was defined with the first appearance of the trace fossil Treptichnus (Phycodes) pedum . In addition, the limit is also very close to a carbon isotope negative anomaly. A profile at Fortune Head , Burin Peninsula, Newfoundland ( Canada ) was identified as the GSSP of the Fortunium level (and the Terreneuvium series and the Cambrian system) . This limit is still controversial, because T. pedum trace fossils were found in two further layers below the current limit (three meters and four meters below the limit), and Treptichnus sp . Trace fossils have also been found deeper.
The upper limit has not yet been set.
literature
- Martin Brasier, John Cowie and Michael Taylor: Decision on the Precambrian-Cambrian boundary stratotype. Episodes, 17 (1/2): pp. 95-100, Beijing 1994 ISSN 0705-3797 PDF .
- Felix Gradstein, Jim Ogg, Alan Smith: A Geologic timescale. Cambridge University Press, 2004, ISBN 978-0-521-78673-7 .
Web links
- International Chronostratigraphic Chart 2012 (PDF)
- 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)