Paleogene
Paleogene යනු සෙනොසොයික් යුගයේ පළමු කාලපරිඡ්ඡේදය, එනම් වසර මිලියන 66-23 කට පෙර යුගය වේ.
| Paleogene | |
|---|---|
| ගොනුව:Oligocene geography.jpg A map of Earth as it appeared during the late Paleogene (Oligocene Epoch, 33 Ma) | |
| Chronology | |
සැකිල්ල:Paleogene graphical timeline | |
| Etymology | |
| Name formality | Formal |
| Alternate spelling(s) | Palaeogene, Palæogene |
| 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 | Iridium enriched layer associated with a major meteorite impact and subsequent K-Pg extinction event. |
| Lower boundary GSSP | El Kef Section, El Kef, Tunisia 36°09′13″N 8°38′55″E / 36.1537°N 8.6486°E |
| GSSP ratified | 1991 |
| Upper boundary definition |
|
| Upper boundary GSSP | Lemme-Carrosio Section, Carrosio, Italy 44°39′32″N 8°50′11″E / 44.6589°N 8.8364°E |
| GSSP ratified | 1996 |
| Atmospheric and climatic data | |
| Mean atmospheric O2 content | c. 26 vol % (130 % of modern) |
| Mean atmospheric CO2 content | c. 500 ppm (2 times pre-industrial) |
| Mean surface temperature | c. 18 °C (4 °C above modern) |
ආශ්රිත
- Cretaceous–Paleogene boundary
මූලාශ්ර
භාහිර සබැඳි
Wikisource has original works on the topic: Cenozoic#Paleogene
Paleogene හා සබැඳි මාධ්ය විකිමාධ්ය කොමන්ස් හි ඇත.
සැකිල්ල:Paleogene Footer
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