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The Evolution of Life part 11 : Paleogene
The Evolution of Life part 11 : Paleogene
Published: 2017/02/09
Channel: Anthöny Pain
The Cretaceous-Palaeogene Mass Extinction: What Do We Really Know?
The Cretaceous-Palaeogene Mass Extinction: What Do We Really Know?
Published: 2016/04/05
Channel: Royal Tyrrell Museum
Paleogene
Paleogene
Published: 2016/01/19
Channel: Lilli Leonard
Cretaceous–Paleogene extinction event - Video Learning - WizScience.com
Cretaceous–Paleogene extinction event - Video Learning - WizScience.com
Published: 2015/07/30
Channel: Wiz Science™
What was life like during the Paleogene Time Period ?
What was life like during the Paleogene Time Period ?
Published: 2017/09/26
Channel: MooMoo Math and Science
Paleogene
Paleogene
Published: 2015/07/14
Channel: Various Artists - Topic
Death of the Megabeasts ( Documentary )
Death of the Megabeasts ( Documentary )
Published: 2017/07/14
Channel: milos velja
Cretaceous–Paleogene boundary - Video Learning - WizScience.com
Cretaceous–Paleogene boundary - Video Learning - WizScience.com
Published: 2015/09/02
Channel: Wiz Science™
How Big was the K-T Impact?
How Big was the K-T Impact?
Published: 2012/11/28
Channel: Ben Deniston
Stevns Vid17 Tertiary or Paleogene
Stevns Vid17 Tertiary or Paleogene
Published: 2016/05/23
Channel: Virtual Field Trips
Saltwater Sanctuary - Rain (Paleogene)
Saltwater Sanctuary - Rain (Paleogene)
Published: 2016/01/29
Channel: loiosh19
Paleogene
Paleogene
Published: 2013/04/12
Channel: Nicola Pacini
Paleogene
Paleogene
Published: 2017/08/23
Channel: Baguette Sketch
KT Asteroid Impact
KT Asteroid Impact
Published: 2011/04/25
Channel: Radek Michalik
Paleogene Meaning
Paleogene Meaning
Published: 2015/04/20
Channel: SDictionary
Velocirapture - Paleogene
Velocirapture - Paleogene
Published: 2015/07/10
Channel: Velocirapture
KT Asteroid & Dinosaurs Extinction
KT Asteroid & Dinosaurs Extinction
Published: 2013/02/26
Channel: bavajose
What Is The Paleogene Period?
What Is The Paleogene Period?
Published: 2017/10/11
Channel: Bet 2 Bet
Paleogene Profile 2- Uintatherium
Paleogene Profile 2- Uintatherium
Published: 2015/11/28
Channel: Animal Bootcamp
The Paleogene
The Paleogene
Published: 2010/10/11
Channel: Taylor Gherardi
Reconstructing Early Paleogene forests, food webs and climate using the fossil leaves of Wyoming
Reconstructing Early Paleogene forests, food webs and climate using the fossil leaves of Wyoming
Published: 2017/11/13
Channel: Geologists of Jackson Hole
Paleogene
Paleogene
Published: 2017/04/05
Channel: Search Engine
Drilling the Cretaceous/Paleogene boundary
Drilling the Cretaceous/Paleogene boundary
Published: 2009/02/05
Channel: Kenneth Miller
The Paleogene Period
The Paleogene Period
Published: 2017/11/01
Channel: Bill Hatfield
Paleocene
Paleocene
Published: 2015/12/10
Channel: Audiopedia
Velocirapture "Paleogene" Album Release Show at 1982
Velocirapture "Paleogene" Album Release Show at 1982
Published: 2015/02/09
Channel: School of the Sensory Deprived Productions
Cretaceous–Paleogene extinction event
Cretaceous–Paleogene extinction event
Published: 2014/08/13
Channel: Audiopedia
Jurassic Fadades & the Cretaceous–Paleogene extinction event
Jurassic Fadades & the Cretaceous–Paleogene extinction event
Published: 2015/10/21
Channel: MrTubularBalls
Cretaceous–Paleogene extinction event
Cretaceous–Paleogene extinction event
Published: 2016/11/05
Channel: Aha Stories
Paleogene Science Project
Paleogene Science Project
Published: 2013/12/06
Channel: Taylor Haggerson
Paleogene larger rotaliid foraminifera from the western and central Neotethys
Paleogene larger rotaliid foraminifera from the western and central Neotethys
Published: 2016/12/05
Channel: Dareel L.
Paleogene Profile 3- Megalodon
Paleogene Profile 3- Megalodon
Published: 2015/11/28
Channel: Animal Bootcamp
Claire Belcher on "WILDFIRES AT THE TRIASSIC-JURASSIC AND CRETACEOUS-PALEOGENE BOUNDARIES"
Claire Belcher on "WILDFIRES AT THE TRIASSIC-JURASSIC AND CRETACEOUS-PALEOGENE BOUNDARIES"
Published: 2014/11/27
Channel: GSA2014: Volcanism, Impacts, and Mass Extinctions
Paleogene larger rotaliid foraminifera from the western and central Neotethys
Paleogene larger rotaliid foraminifera from the western and central Neotethys
Published: 2016/12/05
Channel: R Howe
Cretaceous-Paleogene extinction even: the last moment of the dinosaurs
Cretaceous-Paleogene extinction even: the last moment of the dinosaurs
Published: 2017/09/16
Channel: Nicolas Bredeche
Season 2 Trailer for Paleogene Profile!!!
Season 2 Trailer for Paleogene Profile!!!
Published: 2015/11/28
Channel: Animal Bootcamp
Stevns Vid14 Early Paleogene Beds
Stevns Vid14 Early Paleogene Beds
Published: 2016/05/23
Channel: Virtual Field Trips
Proactive Goal Setting for the Modern Paleogene
Proactive Goal Setting for the Modern Paleogene
Published: 2015/05/15
Channel: IMA Story
Drilling the Cretaceous/Paleogene boundary in New Jersey I
Drilling the Cretaceous/Paleogene boundary in New Jersey I
Published: 2009/02/05
Channel: Kenneth Miller
Virtual NHM Paleogene SpeedPainting
Virtual NHM Paleogene SpeedPainting
Published: 2016/10/24
Channel: Claire Morley
Stevns Vid9 Paleogene Fossils
Stevns Vid9 Paleogene Fossils
Published: 2016/05/23
Channel: Virtual Field Trips
Paleogene environment
Paleogene environment
Published: 2017/04/27
Channel: Ediacaran Earth
5 - Cretaceous Paleogene: 65Ma
5 - Cretaceous Paleogene: 65Ma
Published: 2015/11/04
Channel: danmcgurty
Paleogene-Bert Anjewierden
Paleogene-Bert Anjewierden
Published: 2014/04/18
Channel: Bert Anjewierden
The Paleogene and Neogene of Western Iberia Portugal A Cenozoic record in the European Atlantic doma
The Paleogene and Neogene of Western Iberia Portugal A Cenozoic record in the European Atlantic doma
Published: 2016/12/06
Channel: Levent
Fsc biology book 1 CH 1 LEC:34 Paleogene period
Fsc biology book 1 CH 1 LEC:34 Paleogene period
Published: 2017/11/27
Channel: PG Lectures
Timeline #17 Paleogene หลังจากไดโนเสาร์สูญพันธุ์
Timeline #17 Paleogene หลังจากไดโนเสาร์สูญพันธุ์
Published: 2017/09/10
Channel: Ritopia
paleogene talk
paleogene talk
Published: 2016/11/03
Channel: AQW walkthrough
HOW PRONOUNCE PALEOGENE! (BEST QUALITY VOICES)
HOW PRONOUNCE PALEOGENE! (BEST QUALITY VOICES)
Published: 2017/10/02
Channel: WordBox
History Episode 5: Paleogene Period
History Episode 5: Paleogene Period
Published: 2016/05/07
Channel: Zenoman Knows
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WIKIPEDIA ARTICLE

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Paleogene Period
66–23.03 million years ago
Mean atmospheric O
2
content over period duration
c. 26 vol %[1][2]
(130 % of modern level
Mean atmospheric CO
2
content over period duration
c. 500 ppm[3]
(2 times pre-industrial level)
Mean surface temperature over period duration c. 18 °C[4]
(4 °C above modern level)
Key events in the Paleogene
view • discuss • edit
-65 —
-60 —
-55 —
-50 —
-45 —
-40 —
-35 —
-30 —
-25 —
N. Amer. prairie expands[5]
First Antarctic permanent ice-sheets[6]
An approximate timescale of key Paleogene events.
Axis scale: millions of years ago.

The Paleogene ( /ˈpælədʒn/ or /ˈplədʒn/; also spelled Palaeogene or Palæogene; informally Lower Tertiary) is a geologic period and system that spans 43 million years from the end of the Cretaceous Period 66 million years ago (Mya) to the beginning of the Neogene Period 23.03 Mya. It is the beginning of the Cenozoic Era of the present Phanerozoic Eon.[7] The Paleogene is most notable for being the time during which mammals diversified from relatively small, simple forms into a large group of diverse animals in the wake of the Cretaceous–Paleogene extinction event that ended the preceding Cretaceous Period.[8]

This period consists of the Paleocene, Eocene, and Oligocene epochs. The end of the Paleocene (55.5/54.8 Mya) was marked by the Paleocene–Eocene Thermal Maximum, one of the most significant periods of global change during the Cenozoic, which upset oceanic and atmospheric circulation and led to the extinction of numerous deep-sea benthic foraminifera and on land, a major turnover in mammals. The terms 'Paleogene System' (formal) and 'lower Tertiary System' (informal) are applied to the rocks deposited during the 'Paleogene Period'. The somewhat confusing terminology seems to be due to attempts to deal with the comparatively fine subdivisions of time possible in the relatively recent geologic past, for which more details are preserved. By dividing the Tertiary Period into two periods instead of directly into five epochs, the periods are more closely comparable to the duration of 'periods' of the preceding Mesozoic and Paleozoic Eras.

Climate and geography[edit]

The global climate during the Paleogene departed from the hot and humid conditions of the late Mesozoic era and began a cooling and drying trend which, despite having been periodically disrupted by warm periods such as the Paleocene–Eocene Thermal Maximum, persists today. The trend was partly caused by the formation of the Antarctic Circumpolar Current, which significantly lowered oceanic water temperatures.

During the Paleogene, the continents continued to drift closer to their current positions. India was in the process of colliding with Asia, subsequently forming the Himalayas. The Atlantic Ocean continued to widen by a few centimeters each year. Africa was moving north to meet with Europe and form the Mediterranean, while South America was moving closer to North America (they would later connect via the Isthmus of Panama). Inland seas retreated from North America early in the period. Australia had also separated from Antarctica and was drifting toward Southeast Asia.

Flora and fauna[edit]

Mammals began a rapid diversification during this period. After the Cretaceous–Paleogene extinction event, which saw the demise of the non-avian dinosaurs, mammals transformed from a few small and generalized forms that began to evolve into most of the modern varieties we see today. 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 airborne environments. Those that took to the oceans became modern cetaceans, while those that took to the trees became primates, the group to which humans belong. Birds, which were already well established by the end of the Cretaceous, also experienced an adaptive radiation as they took over the skies left empty by the now extinct Pterosaurs. In comparison to birds and mammals, most other branches of life remained relatively unchanged during this period.

As the Earth cooled, tropical plants became less numerous and were now restricted to equatorial regions. Deciduous plants, which could survive through the seasonal climates the world was now experiencing, became more common.

Geology[edit]

Oil industry relevance[edit]

The Paleogene is notable in the context of offshore oil drilling, and especially in Gulf of Mexico oil exploration, where it is commonly referred to as the "Lower Tertiary". These rock formations represent the current cutting edge of deep-water oil discovery.

Lower Tertiary rock formations encountered in the Gulf of Mexico oil industry usually tend to be comparatively high temperature and high pressure reservoirs, often with high sand content (70%+) or under very thick evaporite sediment layers.[9]

Lower Tertiary explorations to date include (partial list):

References[edit]

  1. ^ Image:Sauerstoffgehalt-1000mj.svg
  2. ^ File:OxygenLevel-1000ma.svg
  3. ^ Image:Phanerozoic Carbon Dioxide.png
  4. ^ Image:All palaeotemps.png
  5. ^ Retallack, G. J. (1997). "Neogene Expansion of the North American Prairie". PALAIOS. 12 (4): 380–390. doi:10.2307/3515337. JSTOR 3515337. Retrieved 2008-02-11. 
  6. ^ Zachos, J. C.; Kump, L. R. (2005). "Carbon cycle feedbacks and the initiation of Antarctic glaciation in the earliest Oligocene". Global and Planetary Change. 47 (1): 51–66. Bibcode:2005GPC....47...51Z. doi:10.1016/j.gloplacha.2005.01.001. 
  7. ^ Formerly, the period covered by the Paleogene was called the first part of the Tertiary, whose usage is no longer official. "Whatever happened to the Tertiary and Quaternary?"
  8. ^ Robert W. Meredith, Jan E. Janecka, John Gatesy, Oliver A. Ryder, Colleen A. Fisher, Emma C. Teeling, Alisha Goodbla, Eduardo Eizirik, Taiz L. L. Simão, Tanja Stadler, Daniel L. Rabosky, Rodney L. Honeycutt, John J. Flynn, Colleen M. Ingram, Cynthia Steiner, Tiffani L. Williams, Terence J. Robinson, Angela Burk-Herrick, Michael Westerman, Nadia A. Ayoub, Mark S. Springer, William J. Murphy. 2011. Impacts of the Cretaceous Terrestrial Revolution and KPg extinction on mammal diversification. Science 334:521-524.
  9. ^ "Lower Tertiary". Halliburton. Retrieved 2011-07-13. 

External links[edit]


Preceded by Proterozoic Eon Phanerozoic Eon
Paleozoic Era Mesozoic Era Cenozoic Era
Cambrian Ordovician Silurian Devonian Carboniferous Permian Triassic Jurassic Cretaceous Paleogene Neogene 4ry

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