Paleogene

Paleogene
Paleogene
66.0 – 23.03 Ma PreЄ Є O S D C P T J K Pg N
	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	Base of magnetic polarity chronozone C6Cn.2n.; Near first appearance of the Planktonic foraminiferan Paragloborotalia kugleri.;
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)

Paleogene යනු සෙනොසොයික් යුගයේ පළමු කාලපරිඡ්ඡේදය, එනම් වසර මිලියන 66-23 කට පෙර යුගය වේ.

ආශ්‍රිත 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.

Paleogene
66.0 – 23.03 Ma PreЄ Є O S D C P T J K Pg N
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 / 36.1537; 8.6486
GSSP ratified	1991^[1]
Upper boundary definition	Base of magnetic polarity chronozone C6Cn.2n. Near first appearance of the Planktonic foraminiferan Paragloborotalia kugleri.
Upper boundary GSSP	Lemme-Carrosio Section, Carrosio, Italy 44°39′32″N 8°50′11″E / 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)