Givetian
The Givetian is one of two faunal stages in the Middle Devonian Period. It lasted from 387.7 million years ago to 382.7 million years ago. It was preceded by the Eifelian Stage and followed by the Frasnian Stage. It is named after the town of Givet in France. The oldest forests occurred during the late Givetian. The lower GSSP is located at Jebel Mech Irdane, Tafilalt, Morocco.
| Givetian | |||||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Chronology | |||||||||||||||||
| |||||||||||||||||
| Etymology | |||||||||||||||||
| Name formality | Formal | ||||||||||||||||
| Usage information | |||||||||||||||||
| Celestial body | Earth | ||||||||||||||||
| Regional usage | Global (ICS) | ||||||||||||||||
| Time scale(s) used | ICS Time Scale | ||||||||||||||||
| Definition | |||||||||||||||||
| Chronological unit | Age | ||||||||||||||||
| Stratigraphic unit | Stage | ||||||||||||||||
| Time span formality | Formal | ||||||||||||||||
| Lower boundary definition | FAD of the conodont Polygnathus hemiansatus | ||||||||||||||||
| Lower boundary GSSP | Jebel Mech Irdane, Tafilalt, Morocco 31.2374°N 4.3541°W | ||||||||||||||||
| Lower GSSP ratified | 1994 | ||||||||||||||||
| Upper boundary definition | FAD of the conodont Ancyrodella rotundiloba | ||||||||||||||||
| Upper boundary GSSP | Col du Puech de la Suque, Montagne Noire, France 43.5032°N 3.0868°E | ||||||||||||||||
| Upper GSSP ratified | 1986 | ||||||||||||||||
This article is issued from Wikipedia. The text is licensed under Creative Commons - Attribution - Sharealike. Additional terms may apply for the media files.