Famennian
The Famennian is the later of two faunal stages in the Late Devonian epoch. The most recent estimate for its duration is that it lasted from around 371.1 to 359.3 million years ago. An earlier 2012 estimate, still used by the International Commission on Stratigraphy, is that it lasted from 372.2 million years ago to 358.9 million years ago. It was preceded by the Frasnian stage and followed by the Tournaisian stage.
| Famennian | |||||||||||||||||
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| Chronology | |||||||||||||||||
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| 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 Palmatolepis subperlobata LAD of the conodont Palmatolepis bogartensis | ||||||||||||||||
| Lower boundary GSSP | Coumiac quarry, Montagne Noire, France 43.4613°N 3.0403°E | ||||||||||||||||
| Lower GSSP ratified | 1993 | ||||||||||||||||
| Upper boundary definition | FAD of the conodont Siphonodella sulcata (discovered to have biostratigraphic issues as of 2006). | ||||||||||||||||
| Upper boundary GSSP | La Serre, Montagne Noire, France 43.5555°N 3.3573°E | ||||||||||||||||
| Upper GSSP ratified | 1990 | ||||||||||||||||
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