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Paleogene
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Paleogene
66.0 – 23.04 Ma PreꞒ Ꞓ O S D C P T J K Pg N
A map of Earth as it appeared 45 million years ago during the Paleogene Period, Eocene Epoch
Chronology
−70 — – −65 — – −60 — – −55 — – −50 — – −45 — – −40 — – −35 — – −30 — – −25 — – −20 — MZ Cenozoic Cretaceous Paleogene Neogene Paleo. Eocene Oligo. Danian Selandian Thanetian Ypresian Lutetian Bartonian Priabonian Rupelian Chattian   ← PETM ← First Antarctic permanent ice-sheets ← K-Pg mass extinction Subdivision of the Paleogene according to the ICS, as of 2024. Vertical axis scale: Millions of years ago
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
Lower 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 / 44.6589; 8.8364
Upper GSSP ratified	1996
Atmospheric and climatic data
Mean atmospheric O2 content	c. 26 vol % (125% of modern)
Mean atmospheric CO2 content	c. 500 ppm (1.8 times pre-industrial)
Mean surface temperature	c. 18 °C (4.5 °C above pre-industrial)

Wikipedia Categories

• Paleogene
• Geological periods

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