The
Paleogene (alternatively
Palaeogene)
period is a unit of
geologic time that began 65.5 ± 0.3 and ended 23.03 ± 0.05 million years ago and comprises the first part of the
Cenozoic era.
[1] Lasting 42 million years, the Paleogene is most notable as being the time in which
mammals evolved from relatively small, simple forms into a plethora of diverse
animals in the wake of the
mass extinction 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 time 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.
This period consists of the
Paleocene,
Eocene, and
Oligocene Epochs. The end of the Paleocene (55.5/54.8 Ma) was marked by one of the most significant periods of global change during the Cenozoic, a sudden global change, the Paleocene-Eocene Thermal Maximum, 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 Paleogene follows the Cretaceous Period and is followed by the
Miocene Epoch of the
Neogene Period. 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, when more information is preserved. By dividing the
Tertiary Period into two periods instead of five epochs, the periods are more closely comparable to the duration of 'periods' in the Mesozoic and Paleozoic Eras.
Notes
A geologic period is a subdivision of geologic time that divides an era into smaller timeframes. The equivalent term used to demarcate rock layers and the fossil record is the system; thus the rocks of the Devonian System were laid down during the Devonian Period.
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The geological time scale is used by geologists and other scientists to describe the timing and relationships between events that have occurred during the history of Earth.
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The Cenozoic Era (IPA pronunciation: [ˌsiːnəˈzəʊɪk]); sometimes Caenozoic Era or Cainozoic Era (in the United Kingdom), meaning "new life" (Greek
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MammaliaLinnaeus, 1758
Subclasses & Infraclasses
- Subclass †Allotheria*
- Subclass Prototheria
- Subclass Theria
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For the Big Finish Productions audio play, see .
An
extinction event (also known as:
mass extinction;
extinction-level event, ELE) is a sharp decrease in the number of species in a relatively short period of time.
..... Click the link for more information. The Cretaceous Period is one of the major divisions of the geologic timescale, reaching from the end of the Jurassic Period (i.e. from 145.5 ± 4.0 million years ago (Ma)) to the beginning of the Paleocene epoch of the Tertiary Period (about 65.5 ± 0.3 Ma).
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Earth's oceans(World Ocean)
- Arctic Ocean
- Atlantic Ocean
- Indian Ocean
- Pacific Ocean
- Southern Ocean
An
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Linnaeus, 1758
Orders
About two dozen - see section below
Birds (class Aves) are bipedal, warm-blooded, egg-laying vertebrate animals.
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Life (Biota)Domains and Kingdoms
- Life on Earth (Gaeabionta)
- Nanobes
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Plate tectonics (from Greek τέκτων, tektōn "builder" or "mason") is a theory of geology that has been developed to explain the observed evidence for large scale motions of the Earth's lithosphere.
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Climate is the average and variations of weather over long periods of time. Climate zones can be defined using parameters such as temperature and rainfall.
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The Paleocene, "early dawn of the recent", is a geologic epoch that lasted from 65.5 ± 0.3 Ma to 55.8 ± 0.2 Ma (million years ago). It is the first epoch of the Palaeogene Period in the modern Cenozoic era.
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The Eocene epoch (55.8 ± 0.2 - 33.9 ± 0.1 Ma) is a major division of the geologic timescale and the second epoch of the Palaeogene period in the Cenozoic era. The Eocene spans the time from the end of the Paleocene epoch to the beginning of the Oligocene epoch.
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The Oligocene epoch is a geologic period that extends from about 33.9 million to 23 million years before the present. As with other older geologic periods, the rock beds that define the period are well identified but the exact dates of the start and end of the period are slightly
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The Miocene Epoch is a period of time that extends from about 23.03 to 5.332 million years before the present. As with other older geologic periods, the rock beds that define the start and end are well identified but the exact dates of the start and end of the period are uncertain.
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- For the hawkmoth genus, see Neogene (moth).
Neogene Period is a unit of geologic time starting 23.03 ± 0.05 million years ago. The Neogene Period follows the Paleogene Period of the Cenozoic Era.
..... Click the link for more information. Tertiary geological time interval covers roughly the time span between the demise of the non-avian dinosaurs and beginning of the most recent Ice Age, approximately 65 million to 1.8 million years ago.
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The Cenozoic Era (IPA pronunciation: [ˌsiːnəˈzəʊɪk]); sometimes Caenozoic Era or Cainozoic Era (in the United Kingdom), meaning "new life" (Greek
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- For the hawkmoth genus, see Neogene (moth).
Neogene Period is a unit of geologic time starting 23.03 ± 0.05 million years ago. The Neogene Period follows the Paleogene Period of the Cenozoic Era.
..... Click the link for more information. Quaternary Period is the geologic time period from the end of the Pliocene Epoch roughly 1.806 million years ago to the present. The Quaternary includes 2 geologic subdivisions — the Pleistocene, including Gelasian that used to belong to Pliocene, and the Holocene
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The Paleocene, "early dawn of the recent", is a geologic epoch that lasted from 65.5 ± 0.3 Ma to 55.8 ± 0.2 Ma (million years ago). It is the first epoch of the Palaeogene Period in the modern Cenozoic era.
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The Eocene epoch (55.8 ± 0.2 - 33.9 ± 0.1 Ma) is a major division of the geologic timescale and the second epoch of the Palaeogene period in the Cenozoic era. The Eocene spans the time from the end of the Paleocene epoch to the beginning of the Oligocene epoch.
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The Oligocene epoch is a geologic period that extends from about 33.9 million to 23 million years before the present. As with other older geologic periods, the rock beds that define the period are well identified but the exact dates of the start and end of the period are slightly
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The Danian (also known as the Montian) is the first stage of the Paleocene Epoch, making up the Early Paleocene sub-epoch. The beginning of the stage is defined by the Cretaceous-Tertiary extinction event 65.5 ± 0.3 Ma (million years ago). The stage ended 61.7 ± 0.
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Selandian or
Middle Paleocene is a stage of the Paleocene Epoch. It spans the time between 61.7 ± 0.2 Ma and 58.7 ± 0.2 Ma (million years ago).
References
- GeoWhen Database - Selandian
Paleogene period
..... Click the link for more information. The Thanetian (also known as the Landenian or Heersian) is the last stage of the Paleocene Epoch, corresponding to the Late Paleocene sub-epoch. It spans the time between 58.7 ± 0.2 Ma and 55.8 ± 0.2 Ma (million years ago).
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The Ypresian is the first stage of the Eocene Epoch and usually corresponds to the Early Eocene subepoch, though sometimes the Lutetian is included therein.
It spans the time between 55.8 ± 0.2 Ma and 48.6 ± 0.2 Ma (million years ago).
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