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levels disconnecting the atlantic from the mediterranean and evaporation rates exceeded inflow from rivers australopithecus evolved in africa beginning the human branch the isthmus of panama formed and animals migrated between north and south america during the great american interchange wreaking havoc on local ecologies climatic changes brought savannas that are still continuing to spread across the world indian monsoons deserts in central asia and the beginnings of the sahara desert the world map has not changed much since save for changes brought about by the glaciations of the quaternary such as the great lakes hudson bay and the baltic sea 26 27 quaternary edit 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 megafauna of pleistocene europe mammoths cave lions woolly rhinoceros reindeer horses the pleistocene lasted from 2 58 million to 11 700 years ago this epoch was marked by ice ages as a result of the cooling trend that started in the mid eocene there were at least four separate glaciation periods marked by the advance of ice caps as far south as 40 n in mountainous areas meanwhile africa experienced a trend of desiccation which resulted in the creation of the sahara namib and kalahari deserts many animals evolved including mammoths giant ground sloths dire wolves sabre toothed cats and homo sapiens 100 000 years ago marked the end of one of the worst droughts in africa and led to the expansion of primitive humans as the pleistocene drew to a close a major extinction wiped out much of the world s megafauna including some of the hominid species such as neanderthals all the continents were affected but africa to a lesser extent it still retains many large animals such as hippos 28 the holocene began 11 700 years ago and lasts to the present day all recorded history and the human history lies within the boundaries of the holocene epoch 29 human activity is blamed for a mass extinction that began roughly 10 000 years ago though the species becoming extinct have only been recorded since the industrial revolution this is sometimes referred to as the sixth extinction it is often cited that over 322 recorded species have become extinct due to human activity since the industrial revolution 30 31 but the rate may be as high as 500 vertebrate species alone the majority of which have occurred after 1900 32 tectonics edit geologically the cenozoic is the era when the continents moved into their current positions australia new guinea having split from pangea during the early cretaceous drifted north and eventually collided with southeast asia antarctica moved into its current position over the south pole the atlantic ocean widened and later in the era 2 8 million years ago south america became attached to north america with the isthmus of panama india collided with asia 55 to 45 million years ago creating the himalayas arabia collided with eurasia closing the tethys ocean and creating the zagros mountains around 35 million years ago 33 the break up of gondwana in late cretaceous and cenozoic times led to a shift in the river courses of various large african rivers including the congo niger nile orange limpopo and zambezi 34 climate edit in the cretaceous the climate was hot and humid with lush forests at the poles there was no permanent ice and sea levels were around 300 metres higher than today this continued for the first 10 million years of the paleocene culminating in the paleocene eocene thermal maximum about 55 5 million years ago around 50 million years ago earth entered a period of long term cooling this was mainly due to the collision of india with eurasia which caused the rise of the himalayas the upraised rocks eroded and reacted with co 2 in the air causing a long term reduction in the proportion of this greenhouse gas in the atmosphere around 35 million years ago permanent ice began to build up on antarctica 35 the cooling trend continued in the miocene with relatively short warmer periods when south america became attached to north america creating the isthmus of panama around 2 8 million years ago the arctic region cooled due to the strengthening of the humboldt and gulf stream currents 36 eventually leading to the glaciations of the quaternary ice age the current interglacial of which is the holocene epoch recent analysis of the geomagnetic reversal frequency oxygen isotope record and tectonic plate subduction rate which are indicators of the changes in the heat flux at the core mantle boundary climate and plate tectonic activity shows that all these changes indicate similar rhythms on million years timescale in the cenozoic era occurring with the common fundamental periodicity of 13 myr during most of the time 37 the levels of carbonate ions in the ocean fell over the course of the cenozoic 38 life edit restoration of palaeotherium a paleogene relative of horses that lived in subtropical climates of europe during the eocene early in the cenozoic following the k pg event the planet was dominated by relatively small fauna including small mammals birds reptiles and amphibians from a geological perspective it did not take long for mammals to greatly diversify in the absence of the dinosaurs that had dominated during the mesozoic 39 birds also diversified rapidly some flightless birds grew larger than humans these species are sometimes referred to as terror birds and were formidable predators mammals came to occupy almost every available niche both marine and terrestrial and some also grew very large attaining sizes not seen in most of today s terrestrial mammals the ranges of many cenozoic bird clades were governed by latitude and temperature and have contracted over the course of this era as the world cooled 40 during the cenozoic mammals proliferated from a few small simple generalised forms into a diverse collection of terrestrial marine and flying animals giving this period its other name the age of mammals the cenozoic is just as much the age of savannas the age of co dependent flowering plants and insects and the age of birds 41 grasses also played a very important role in this era shaping the evolution of the birds and mammals that fed on them one group that diversified significantly in the cenozoic as well were the snakes evolving in the cenozoic the variety of snakes increased tremendously resulting in many colubrids following the evolution of their current primary prey source the rodents in the earlier part of the cenozoic the world was dominated by the gastornithid birds terrestrial crocodylians like pristichampsus large sharks such as otodus and a handful of primitive large mammal groups like uintatheres mesonychians and pantodonts but as the forests began to recede and the climate began to cool other mammals took over the cenozoic is full of mammals both strange and familiar including chalicotheres creodonts whales primates entelodonts sabre toothed cats mastodons and mammoths three toed horses giant rhinoceros like paraceratherium the rhinoceros like brontotheres various bizarre groups of mammals from south america such as the vaguely elephant like pyrotheres and the dog like marsupial relatives called borhyaenids and the monotremes and marsupials of australia mammal evolution in the cenozoic was predominantly shaped by climatic and geological processes 42 43 cenozoic calcareous nannoplankton experienced rapid rates of speciation and reduced species longevity while suffering prolonged declines in diversity during the eocene and neogene diatoms in contrast experienced major diversification over the eocene especially at high latitudes as the world s oceans cooled 44 diatom diversification was particularly concentrated at the eocene oligocene boundary a second major pulse of diatom diversification occurred over the course of the middle and late miocene 45 see also edit earth sciences portal cretaceous paleogene boundary k t boundary geologic time scale late cenozoic ice age references edit gallipoli map 2nd ed 1 100 000 carta geologica d italia scala 1 100 000 dipartimento per il servizio geologico d italia 1968 sheet foglio 214 retrieved 31 may 2025 cenozoic lexico uk english dictionary oxford university press archived from the original on 23 november 2021 cenozoic merriam webster com dictionary merriam webster oclc 1032680871 cenozoic online etymology dictionary phillips john 1840 palæozoic series penny cyclopaedia of the society for the diffusion of useful knowledge vol 17 london england charles knight and co pp 153 154 from pp 153 154 as many systems or combinations of organic forms as are clearly traceable in the stratified crust of the globe so many corresponding terms as palæozoic mesozoic kainozoic c may be made wilmarth mary grace 1925 bulletin 769 the geologic time classification of the united 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