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Devonian යනු වසර මිලියන 419-359 කට පෙර, එනම් Paleozoic යුගයේ සිව්වන කාලපරිච්ඡේදය වේ.
Devonian | |
---|---|
Chronology | |
සැකිල්ල:Devonian graphical timeline | |
Etymology | |
Name formality | Formal |
Nickname(s) | Age of Fishes |
Usage information | |
Celestial body | Earth |
Regional usage | Global (ICS) |
Time scale(s) used | ICS Time Scale |
Definition | |
Chronological unit | Period |
Stratigraphic unit | System |
Time span formality | Formal |
Lower boundary definition | FAD of the Graptolite Monograptus uniformis |
Lower boundary GSSP | Klonk, Czech Republic 49.8550°N 13.7920°E |
GSSP ratified | 1972[1] |
Upper boundary definition | FAD of the Conodont Siphonodella sulcata (discovered to have biostratigraphic issues as of 2006).[2] |
Upper boundary GSSP | La Serre, Montagne Noire, France 43.5555°N 3.3573°E |
GSSP ratified | 1990[3] |
Atmospheric and climatic data | |
Sea level above present day | Relatively steady around 189 m, gradually falling to 120 m through period[4] |
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