65.5–23.03 ẹgbẹgbẹ̀rún ọdun sẹ́yìn
|Mean atmospheric O2 content over period duration||ca. 26 Vol %|
(130 % of modern level)
|Mean atmospheric CO2 content over period duration||ca. 500 ppm|
(2 times pre-industrial level)
|Mean surface temperature over period duration||ca. 18 °C|
(4 °C above modern level)
|Àdàkọ:Ìgbà Ìbíniàtijọ́ graphical timeline|
The Paleogene (alternatively Palæogene, informally Lower Tertiary) is a geologic period and system that began 65.5 ± 0.3 and ended 23.03 ± 0.05 million years ago and comprises the first part of the Cenozoic Era. Lasting 42 million years, the Paleogene is most notable as being the time in which mammals evolved from relatively small, simple forms into a large group of diverse animals in the wake of the Cretaceous–Tertiary extinction event that ended the preceding Cretaceous Period. Some of these mammals would evolve into large forms that would dominate the land, while others would become capable of living in marine, specialized terrestrial and even airborne environments. Birds also evolved considerably during this period, changing into roughly modern forms. Most other branches of life on earth remained relatively unchanged in comparison to birds and mammals during this period. Some continental motion took place. Climates cooled somewhat over the duration of the Paleogene and inland seas retreated from North America early in the period.
|Àyọkà yìí tàbí apá rẹ̀ únfẹ́ àtúnṣe sí.|
- Image:Phanerozoic Carbon Dioxide.png
- Image:All palaeotemps.png
- Formerly the period covered by the Paleogene was called the first part of the Tertiary, which usage is no longer official. "Whatever happened to the Tertiary and Quaternary?"
|Preceded by Proterozoic Eon||542 Ma - Phanerozoic Eon - Present|
|542 Ma - Paleozoic Era - 251 Ma||251 Ma - Mesozoic Era - 65 Ma||65 Ma - Cenozoic Era - Present|