Paleogene
From Wikipedia, the free encyclopedia
Paleogene යනු සෙනොසොයික් යුගයේ පළමු කාලපරිඡ්ඡේදය, එනම් වසර මිලියන 66-23 කට පෙර යුගය වේ.
Quick Facts Chronology, Etymology ...
Paleogene | |
---|---|
66.0 – 23.03 Ma | |
ගොනුව:Oligocene geography.jpg | |
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 36.1537°N 8.6486°E / 36.1537; 8.6486 |
GSSP ratified | 1991[1] |
Upper boundary definition |
|
Upper boundary GSSP | Lemme-Carrosio Section, Carrosio, Italy 44.6589°N 8.8364°E / 44.6589; 8.8364 |
GSSP ratified | 1996[2] |
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) |
Close