Olenekium
| system | series | step | ≈ age ( mya ) |
|---|---|---|---|
| higher | higher | higher | younger |
| Triad | Upper Triassic | Rhaetium | 201.3 ⬍ 208.5 |
| Norium | 208.5 ⬍ 228 |
||
| Carnium | 228 ⬍ 235 |
||
| Middle Triassic | Ladinium | 235 ⬍ 242 |
|
| Anisium | 242 ⬍ 247.2 |
||
| Lower Triassic | Olenekium | 247.2 ⬍ 251.2 |
|
| Indusium | 251.2 ⬍ 251.9 |
||
| deeper | deeper | deeper | older |
The Olenekium (in German often shortened to Olenek ) is the upper chronostratigraphic level of the Lower Triassic in geological history . The stage begins geochronologically about 251.2 million years ago and ends 247.2 million years ago. It therefore lasted about 4 million years. The Olenekium is preceded by the Indusium ; it is followed by the anisium .
Naming and history
The type locality is on the Olenek River in Siberia .
definition
The beginning of the stage is defined as the first appearance of the conodont species Neospathodus waageni and the first appearance of the ammonite genera Flemingites and Euflemingites . The first appearance of the conodont species Chiosella timorensis marks the end of the stage. A GSSP (global type locality and type profile) has not yet been defined.
Breakdown
Regionally, the Olenekium is subdivided into the lower levels Smithium and Spathium . The Olenekium used to be part of the Scythian level ( Scythian ) together with the Indusium , but this is no longer an officially recognized level and is only used regionally (e.g. in the Alps).
Situation in Central Europe during the Olenekian
In the Lower Triassic in Central Europe, the terrestrial sediments of the red sandstone are deposited .
Individual evidence
- ↑ 251 to 248 million years according to Brack et al. (2005)
literature
- Peter Brack, Hans Rieber, Alda Nicora and Roland Mundil: The Global boundary Stratotype Section and Point (GSSP) of the Ladinian Stage (Middle Triassic) at Bagolino (Southern Alps, Northern Italy) and its implications for the Triassic time scale. In: Episodes. 28 (4): 233-244, Beijing 2005 ISSN 0705-3797 .
- Felix Gradstein, Jim Ogg, Jim & Alan Smith: A Geologic timescale. Cambridge University Press 2005, ISBN 978-0-521-78673-7
- Hans Murawski & Wilhelm Meyer: Geological dictionary . 10., rework. u. exp. Ed., 278, 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)