Paleogene
Appearance
Paleogene | |
---|---|
ගොනුව:Oligocene geography.jpg A map of Earth as it appeared during the late Paleogene (Oligocene Epoch, 33 Ma) | |
Chronology | |
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[1] |
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[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) |
Paleogene යනු සෙනොසොයික් යුගයේ පළමු කාලපරිඡ්ඡේදය, එනම් වසර මිලියන 66-23 කට පෙර යුගය වේ.
ආශ්රිත
[සංස්කරණය]මූලාශ්ර
[සංස්කරණය]- ^ Molina, Eustoquio; Alegret, Laia; Arenillas, Ignacio; José A. Arz; Gallala, Njoud; Hardenbol, Jan; Katharina von Salis; Steurbaut, Etienne; Vandenberghe, Noel; Dalila Zaghibib-Turki (2006). "The Global Boundary Stratotype Section and Point for the base of the Danian Stage (Paleocene, Paleogene, "Tertiary", Cenozoic) at El Kef, Tunisia - Original definition and revision". Episodes. 29 (4): 263–278. doi:10.18814/epiiugs/2006/v29i4/004.
- ^ Steininger, Fritz F.; M. P. Aubry; W. A. Berggren; M. Biolzi; A. M. Borsetti; Julie E. Cartlidge; F. Cati; R. Corfield; R. Gelati; S. Iaccarino; C. Napoleone; F. Ottner; F. Rögl; R. Roetzel; S. Spezzaferri; F. Tateo; G. Villa; D. Zevenboom (1997). "The Global Stratotype Section and Point (GSSP) for the base of the Neogene" (PDF). Episodes. 20 (1): 23–28. doi:10.18814/epiiugs/1997/v20i1/005.
භාහිර සබැඳි
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Wikisource has original works on the topic: Cenozoic#Paleogene
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Paleogene හා සබැඳි මාධ්ය විකිමාධ්ය කොමන්ස් හි ඇත.