Emsian
| Emsian | |
|---|---|
Age | |
| Stratigraphic unit | Stage |
| Time span formality | Formal |
| Lower boundary definition | FAD of the conodont Polygnathus kitabicus |
| Lower boundary GSSP | Zinzil'ban Gorge, Uzbekistan 39°12′00″N 67°18′20″E / 39.2000°N 67.3056°E |
| Lower GSSP ratified | 1995[5] |
| Upper boundary definition | FAD of the conodont Polygnathus costatus partitus |
| Upper boundary GSSP | Wetteldorf Richtschnitt section, Wetteldorf, Eifel, Germany 50°08′59″N 6°28′18″E / 50.1496°N 6.4716°E |
| Upper GSSP ratified | 1985[6] |
The Emsian is one of three
Ems river in Germany.[7] The GSSP is located in the Zinzil'ban Gorge in the Kitab State Geological Reserve of Uzbekistan, 35 centimetres (14 in) above the contact with the Madmon Formation
.
In North America the Emsian Stage is represented by Sawkill or Sawkillian time.
Biological events
During this period, earliest known
mya).[8][9] Later agoniatitid ammonoids would die out in the Taghanic event in the upper middle Givetian. Goniatite ammonoids would give rise to further ammonoid orders, thus starting ammonoid dominance of marine fossils in further periods until their end at the Cretaceous-Paleogene mass extinction event
.
References
- .
- doi:10.1086/421077.
- .
- ^ "Chart/Time Scale". www.stratigraphy.org. International Commission on Stratigraphy.
- . Retrieved 18 December 2020.
- . Retrieved 18 December 2020.
- ^ "Emsian stage". Encyclopedia Britannica. Retrieved 2 October 2019.
- .
- ^ Chlupac, I.; Lukes, P. (January 1999). "Pragian/Zlichovian and Zlichovian/Dalejan boundary sections in the Lower Devonian of the Barrandian Area, Czech Republic". ResearchGate. Retrieved June 26, 2018.
 | This geochronology article is a stub. You can help Wikipedia by expanding it. |