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The Quaternary (/ kwəˈtɜːrnəri, ˈkwɒtərnɛri / kwə-TUR-nə-ree, KWOT-ər-nerr-ee) is the current and most recent of the three periods of the Cenozoic Era in the geologic time scale of the International Commission on Stratigraphy (ICS). [ 4 ] It follows the Neogene Period and spans from 2.58 million years ago to the present. [ 5 ]
The Quaternary spans from 2.58 million years ago to present day, and is the shortest geological period in the Phanerozoic Eon. It features modern animals, and dramatic changes in the climate. It is divided into two epochs: the Pleistocene and the Holocene. The Pleistocene lasted from 2.58 million to 11,700 years ago.
A life form (also spelled life-form or lifeform) is an entity that is living, [1] [2] such as plants , animals , and fungi . It is estimated that more than 99% of all species that ever existed on Earth, amounting to over five billion species, [3] are extinct. [4] [5] Earth is the only celestial body known to harbor life forms. No form of ...
The Holocene (/ ˈhɒl.əsiːn, - oʊ -, ˈhoʊ.lə -, - loʊ -/) [ 2 ][ 3 ] is the current geological epoch, beginning approximately 11,700 years ago. [ 4 ] It follows the Last Glacial Period, which concluded with the Holocene glacial retreat. [ 4 ] The Holocene and the preceding Pleistocene [ 5 ] together form the Quaternary period.
The Quaternary spans from 2.58 million years ago to present day, and is the shortest geological period in the Phanerozoic Eon. It features modern animals, and dramatic changes in the climate. It features modern animals, and dramatic changes in the climate.
The timeline of the evolutionary history of liferepresents the current scientific theoryoutlining the major events during the development of lifeon planet Earth. Dates in this article are consensus estimates based on scientific evidence, mainly fossils. In biology, evolutionis any change across successive generations in the heritable ...
The Late Pleistocene to the beginning of the Holocene saw the extinction of the majority of the world's megafauna (typically defined as animal species having body masses over 44 kilograms (97 lb)), [ 1 ] which resulted in a collapse in faunal density and diversity across the globe. [ 2 ]
The Neogene (/ ˈniː.ədʒiːn / NEE-ə-jeen, [ 6 ][ 7 ]) is a geologic period and system that spans 20.45 million years from the end of the Paleogene Period 23.03 million years ago (Mya) to the beginning of the present Quaternary Period 2.58 million years ago. The Neogene is sub-divided into two epochs, the earlier Miocene and the later Pliocene.