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Miocene
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{{Neogene}}The Miocene ({{IPAc-en|pron|ˈ|m|aɪ|.|ə|ˌ|s|iː|n|,_|ˈ|m|aɪ|.|oʊ|-}} {{respell|MY|ə|seen|,_|MY|oh|-}}{{refn|{{Dictionary.com|Miocene}}}}{{refn|{{MerriamWebsterDictionary|Miocene}}}}) is the first geological epoch of the Neogene Period and extends from about {{mya|23.03|5.333}} (Ma). The Miocene was named by Charles Lyell; its name comes from the Greek words (', "less") and (', "new")See:
  • Letter from William Whewell to Charles Lyell dated 31 January 1831 in: BOOK, Todhunter, Isaac, William Whewell, D. D., Master of Trinity College, Cambridge: An account of his writings with selections from his literary and scientific correspondence, 1876, Macmillan and Co., London, England, vol. 2, 111,weblink
  • BOOK, Lyell, Charles, Principles of Geology, …, 1833, vol. 3, John Murray, London, England, 54,weblink From p. 54: "The next antecedent tertiary epoch we shall name Miocene, from μειων, minor, and χαινος, recens, a minority only of fossil shells imbedded in the formations of this period, being of recent species."DICTIONARY, Miocene, Online Etymology Dictionary,weblink 2016-01-20, and means "less recent" because it has 18% fewer modern sea invertebrates than the Pliocene.BOOK, Lyell, Charles, Principles of Geology, …, 1833, vol. 3, John Murray, London, England, 54,weblink The Miocene is preceded by the Oligocene and is followed by the Pliocene.
As the earth went from the Oligocene through the Miocene and into the Pliocene, the climate slowly cooled towards a series of ice ages. The Miocene boundaries are not marked by a single distinct global event but consist rather of regionally defined boundaries between the warmer Oligocene and the cooler Pliocene Epoch.The apes first evolved, arose, and diversified during the early Miocene (Aquitanian and Burdigalian stages), becoming widespread in the Old World. By the end of this epoch and the start of the following one, the ancestors of humans had split away from the ancestors of the chimpanzees to follow their own evolutionary path during the final Messinian stage (7.5–5.3 mya) of the Miocene. As in the Oligocene before it, grasslands continued to expand and forests to dwindle in extent. In the seas of the Miocene, kelp forests made their first appearance and soon became one of Earth's most productive ecosystems.WEB,weblink BBC Nature - Miocene epoch videos, news and facts, BBC, 2016-11-13, The plants and animals of the Miocene were recognizably modern. Mammals and birds were well-established. Whales, pinnipeds, and kelp spread.The Miocene is of particular interest to geologists and palaeoclimatologists as major phases of the geology of the Himalaya occurred during the Miocene, affecting monsoonal patterns in Asia, which were interlinked with glacial periods in the northern hemisphere.JOURNAL, Evolution of Asian monsoons and phased uplift of the Himalaya–Tibetan plateau since Late Miocene times, Zhisheng, An, Kutzbach, John E., Prell, Warren L., Porter, Stephen C., Nature, 3 May 2001, 411, 6833, 62–66, 10.1038/35075035, 11333976, 2001Natur.411...62Z,

Subdivisions

(File:Miocene Chart.jpg|thumb|Subdivisions of the Miocene)The Miocene faunal stages from youngest to oldest are typically named according to the International Commission on Stratigraphy:WEB, Robert A. Rohde, 2005,weblink GeoWhen Database, March 8, 2011, {| class="wikitable"! Sub-epoch! Faunal stage! Time range
Late MioceneMessinian >annum>Ma
Tortonian >| 11.608–7.246 Ma
Middle MioceneSerravallian >| 13.65–11.608 Ma
Langhian >| 15.97–13.65 Ma
Early MioceneBurdigalian >| 20.43–15.97 Ma
Aquitanian age>Aquitanian 23.03–20.43 Ma
Regionally, other systems are used, based on characteristic land mammals; some of them overlap with the preceding Oligocene and following Pliocene epochs:European Land Mammal Ages North American Land Mammal Ages South American Land Mammal Ages

Paleogeography

Continents continued to drift toward their present positions. Of the modern geologic features, only the land bridge between South America and North America was absent, although South America was approaching the western subduction zone in the Pacific Ocean, causing both the rise of the Andes and a southward extension of the Meso-American peninsula.Mountain building took place in western North America, Europe, and East Asia. Both continental and marine Miocene deposits are common worldwide with marine outcrops common near modern shorelines. Well studied continental exposures occur in the North American Great Plains and in Argentina.India continued to collide with Asia, creating dramatic new mountain ranges. The Tethys seaway continued to shrink and then disappeared as Africa collided with Eurasia in the Turkish–Arabian region between 19 and 12 Ma. The subsequent uplift of mountains in the western Mediterranean region and a global fall in sea levels combined to cause a temporary drying up of the Mediterranean Sea (known as the Messinian salinity crisis) near the end of the Miocene.The global trend was towards increasing aridity caused primarily by global cooling reducing the ability of the atmosphere to absorb moisture. Uplift of East Africa in the late Miocene was partly responsible for the shrinking of tropical rain forests in that region, and Australia got drier as it entered a zone of low rainfall in the Late Miocene.

South America

During the Oligocene and Early Miocene the coast of northern Brazil,JOURNAL, Rossetti, Dilce F., Bezerra, Francisco H.R., Dominguez, José M.L., 2013, Late Oligocene–Miocene transgressions along the equatorial and eastern margins of Brazil, Earth-Science Reviews, 123, 87–112, 10.1016/j.earscirev.2013.04.005, 2013ESRv..123...87R, Colombia, south-central Peru, central Chile and large swathes of inland Patagonia were subject to a marine transgression.JOURNAL, Macharé, José, Devries, Thomas, Barron, John, Fourtanier, Élisabeth, 1988, Oligo-Miocene transgression along the Pacifie margin of South America: new paleontological and geological evidence from the Pisco basin (Peru),weblink Geódynamique, 3, 1–2, 25–37, The transgressions in the west coast of South America is thought to be caused by a regional phenomenon while the steadily rising central segment of the Andes represents an exception. While there are numerous registers of Oligo-Miocene transgressions around the world it is doubtful that these correlate.It is thought that the Oligo-Miocene transgression in Patagonia could have temporarily linked the Pacific and Atlantic Oceans, as inferred from the findings of marine invertebrate fossils of both Atlantic and Pacific affinity in La Cascada Formation.JOURNAL, Encinas, Alfonso, Pérez, Felipe, Nielsen, Sven, Finger, Kenneth L., Valencia, Victor, Duhart, Paul, 2014, Geochronologic and paleontologic evidence for a Pacific–Atlantic connection during the late Oligocene–early Miocene in the Patagonian Andes (43–44°S), Journal of South American Earth Sciences, 55, 1–18, 10.1016/j.jsames.2014.06.008, 2014JSAES..55....1E, JOURNAL, Nielsen, S.N., 2005, Cenozoic Strombidae, Aporrhaidae, and Struthiolariidae (Gastropoda, Stromboidea) from Chile: their significance to biogeography of faunas and climate of the south-east Pacific, Journal of Paleontology, 79, 1120–1130, 10.1666/0022-3360(2005)079[1120:csaasg]2.0.co;2, Connection would have occurred through narrow epicontinental seaways that formed channels in a dissected topography.The Antarctic Plate started to subduct beneath South America 14 million years ago in the Miocene, forming the Chile Triple Junction. At first the Antarctic Plate subducted only in the southernmost tip of Patagonia, meaning that the Chile Triple Junction lay near the Strait of Magellan. As the southern part of Nazca Plate and the Chile Rise became consumed by subduction the more northerly regions of the Antarctic Plate begun to subduct beneath Patagonia so that the Chile Triple Junction advanced to the north over time.JOURNAL, Cande, S.C., Leslie, R.B., 1986, Late Cenozoic Tectonics of the Southern Chile Trench, Journal of Geophysical Research-Solid Earth and Planets, 91, B1, 471–496, 10.1029/jb091ib01p00471, 1986JGR....91..471C, The asthenospheric window associated to the triple junction disturbed previous patterns of mantle convection beneath Patagonia inducing an uplift of ca. 1 km that reversed the Oligocene–Miocene transgression.JOURNAL, Guillame, Benjamin, Martinod, Joseph, Husson, Laurent, Roddaz, Martin, Riquelme, Rodrigo, 2009, Neogene uplift of central eastern Patagonia: Dynamic response to active spreading ridge subduction?, Tectonics (journal), Tectonics, 28, JOURNAL, Guillaume, Benjamin, Gautheron, Cécile, Simon-Labric, Thibaud, Martinod, Joseph, Roddaz, Martin, Douville, Eric, 2013, Dynamic topography control on Patagonian relief evolution as inferred from low temperature thermochronology, Earth and Planetary Science Letters, 3, 157–167, 10.1016/j.epsl.2012.12.036, 2013E&PSL.364..157G, As the southern Andes rose in the Middle Miocene (14–12 million years ago) the resulting rain shadow originated the Patagonian Desert to the east.JOURNAL, Folguera, Andrés, Encinas, Alfonso, Echaurren, Andrés, Gianni, Guido, Orts, Darío, Valencia, Víctor, Carrasco, Gabriel, Constraints on the Neogene growth of the central Patagonian Andes at thelatitude of the Chile triple junction (45–47°S) using U/Pb geochronology insynorogenic strata, Tectonophysics (journal), Tectonophysics, 2018, 744, 134–154, 10.1016/j.tecto.2018.06.011,

Climate

Climates remained moderately warm, although the slow global cooling that eventually led to the Pleistocene glaciations continued.Although a long-term cooling trend was well underway, there is evidence of a warm period during the Miocene when the global climate rivalled that of the Oligocene. The Miocene warming began 21 million years ago and continued until 14 million years ago, when global temperatures took a sharp drop—the Middle Miocene Climate Transition (MMCT). By 8 million years ago, temperatures dropped sharply once again, and the Antarctic ice sheet was already approaching its present-day size and thickness. Greenland may have begun to have large glaciers as early as 7 to 8 million years ago,{{Citation needed|date=May 2007}} although the climate for the most part remained warm enough to support forests there well into the Pliocene.

Life

Life during the Miocene Epoch was mostly supported by the two newly formed biomes, kelp forests and grasslands. Grasslands allow for more grazers, such as horses, rhinoceroses, and hippos. Ninety-five percent of modern plants existed by the end of this epoch.

Flora

File:Socotra dragon tree.JPG|thumbnail|The dragon blood tree is considered a remnant of the Mio-Pliocene Laurasian subtropical forests that are now almost extinct in North Africa.JOURNAL, 10.1016/j.biocon.2007.05.009, Will dragonblood survive the next period of climate change? Current and future potential distribution of Dracaena cinnabari (Socotra, Yemen), 2007, Attorre, F., Francesconi, F., Taleb, N., Scholte, P., Saed, A., Alfo, M., Bruno, F., Biological Conservation, 138, 3–4, 430–439, ]]The coevolution of gritty, fibrous, fire-tolerant grasses and long-legged gregarious ungulates with high-crowned teeth, led to a major expansion of grass-grazer ecosystems, with roaming herds of large, swift grazers pursued by predators across broad sweeps of open grasslands, displacing desert, woodland, and browsers. The higher organic content and water retention of the deeper and richer grassland soils, with long-term burial of carbon in sediments, produced a carbon and water vapor sink. This, combined with higher surface albedo and lower evapotranspiration of grassland, contributed to a cooler, drier climate.JOURNAL
, Retallack
, Gregory
, Cenozoic Expansion of Grasslands and Climatic Cooling
, 2001
, The Journal of Geology
, 109
, 4
, 407–426
, University of Chicago Press
,weblink
, 2001JG....109..407R
, 10.1086/320791
, dead
,weblink" title="web.archive.org/web/20130506232759weblink">weblink
, 2013-05-06
, C4 grasses, which are able to assimilate carbon dioxide and water more efficiently than C3 grasses, expanded to become ecologically significant near the end of the Miocene between 6 and 7 million years ago.JOURNAL
, Osborne, C.P., Beerling, D.J., David Beerling
, Nature's green revolution: the remarkable evolutionary rise of C4 plants
, 2006, Philosophical Transactions of the Royal Society B: Biological Sciences, 361, 1465, 173–194
, 10.1098/rstb.2005.1737, 16553316, 1626541, The expansion of grasslands and radiations among terrestrial herbivores correlates to fluctuations in CO2.JOURNAL
, Wolfram M. Kürschner, Zlatko Kvacek & David L. Dilcher
, The impact of Miocene atmospheric carbon dioxide fluctuations on climate and the evolution of terrestrial ecosystems
, 2008, Proceedings of the National Academy of Sciences, 105, 2, 449–53
, 10.1073/pnas.0708588105, 2008PNAS..105..449K, 18174330, 2206556,
Cycads between 11.5 and 5 million years ago began to rediversify after previous declines in variety due to climatic changes, and thus modern cycads are not a good model for a "living fossil".JOURNAL
, Susanne S. Renner
, Living fossil younger than thought
, 2011, Science (journal), Science, 334, 6057, 766–767
, 10.1126/science.1214649, 22076366, 2011Sci...334..766R, Eucalyptus fossil leaves occur in the Miocene of New Zealand, where the genus is not native today, but have been introduced from Australia.WEB,weblink Eucalyptus fossils in New Zealand - the thin end of the wedge - Mike Pole, 2014-09-22,

Fauna

{{Human timeline}}
missing image!
- CamelFootprintBarstowMiocene.jpg -
upCameloid footprint (Lamaichnum alfi Sarjeant and Reynolds, 1999; convex hyporelief) from the Barstow Formation (Miocene) of Rainbow Basin, California.
Both marine and continental fauna were fairly modern, although marine mammals were less numerous. Only in isolated South America and Australia did widely divergent fauna exist.In the Early Miocene, several Oligocene groups were still diverse, including nimravids, entelodonts, and three-toed equids. Like in the previous Oligocene epoch, oreodonts were still diverse, only to disappear in the earliest Pliocene. During the later Miocene mammals were more modern, with easily recognizable canids, bears, procyonids, equids, beavers, deer, camelids, and whales, along with now extinct groups like borophagine canids, certain gomphotheres, three-toed horses, and semiaquatic and hornless rhinos like Teleoceras and Aphelops. Islands began to form between South and North America in the Late Miocene, allowing ground sloths like Thinobadistes to island-hop to North America. The expansion of silica-rich C4 grasses led to worldwide extinctions of herbivorous species without high-crowned teeth.BOOK
, Steven M. Stanley
, 1999, Earth System History, 525–526, Freeman, New York
, 0-7167-2882-6,
File:Miocene.jpg|thumb|left|upright|Miocene fauna of North America, as restored by paleoartist Jay MatternesJay MatternesA few basal mammal groups endured into this epoch in southern landmasses, including the South American dryolestoid Necrolestes and gondwanathere Patagonia and New Zealand's Saint Bathans mammal. Non-marsupial metatherians were also still around, such as the American and Eurasian herpetotheriids and peradectids such as Siamoperadectes, and the South American sparassodonts.Unequivocally recognizable dabbling ducks, plovers, typical owls, cockatoos and crows appear during the Miocene. By the epoch's end, all or almost all modern bird groups are believed to have been present; the few post-Miocene bird fossils which cannot be placed in the evolutionary tree with full confidence are simply too badly preserved, rather than too equivocal in character. Marine birds reached their highest diversity ever in the course of this epoch.Approximately 100 species of apes lived during this time, ranging throughout Africa, Asia and Europe and varying widely in size, diet, and anatomy. Due to scanty fossil evidence it is unclear which ape or apes contributed to the modern hominid clade, but molecular evidence indicates this ape lived between 7 and 8 million years ago.WEB,weblink New genetic data shows humans and great apes diverged earlier than thought, Yirka, Bob, phys.org, August 15, 2012, The first hominins (bipedal apes of the human lineage) appeared in Africa at the very end of the Miocene, including Sahelanthropus, Orrorin, and an early form of Ardipithecus (A. kadabba) The chimpanzee–human divergence is thought to have occurred at this time.WEB,weblink Fossil Record of Miocene Hominoids, Begun, David, University of Toronto, July 11, 2014,weblink" title="web.archive.org/web/20131030004151weblink">weblink October 30, 2013, dead, The expansion of grasslands in North America also led to an explosive radiation among snakes.BOOK, Holman, J. Alan, Fossil Snakes of North America, 2000, Indiana University Press, Bloomington, IN, 0253337216, 284–323, First, Previously, snakes were a minor component of the North American fauna, but during the Miocene, the number of species and their prevalence increased dramatically with the first appearances of vipers and elapids in North America and the significant diversification of Colubridae (including the origin of many modern genera such as Nerodia, Lampropeltis, Pituophis and Pantherophis).(File:Calvert Zone 10 Calvert Co MD.jpg|thumb|Fossils from the Calvert Formation, Zone 10, Calvert Co., MD (Miocene))File:The Childrens Museum of Indianapolis - Miocene crab.jpg|thumbnail|A Miocene crab (Tumidocarcinus giganteus) from the collection of the Children's Museum of IndianapolisChildren's Museum of IndianapolisIn the oceans, brown algae, called kelp, proliferated, supporting new species of sea life, including otters, fish and various invertebrates.Cetaceans attained their greatest diversity during the Miocene,BOOK
, Peter Klimley
, David Ainley
, yes
, Great White Sharks: the Biology of Carcharodon carcharias
, 1996
, Academic Press
,weblink
, 0-12-415031-4
, 2011-08-12
,weblink" title="web.archive.org/web/20121012190507weblink">weblink
, 2012-10-12
, dead
, with over 20 recognized genera of baleen whales in comparison to only six living genera.JOURNAL, Dooley, Alton C., Fraser, Nicholas C., Luo, Zhe-Xi, The earliest known member of the rorqual—gray whale clade (Mammalia, Cetacea),weblink Journal of Vertebrate Paleontology, en, 24, 2, 453–463, 0272-4634, This diversification correlates with emergence of gigantic macro-predators such as megatoothed sharks and raptorial sperm whales.JOURNAL
, Olivier Lambert, Giovanni Bianucci, Klaas Post, Christian de Muizon, Rodolfo Salas-Gismondi, Mario Urbina, Jelle Reumer, The giant bite of a new raptorial sperm whale from the Miocene epoch of Peru
, 2010, Nature (journal), Nature, 466, 7302, 105–108
, 20596020, 10.1038/nature09067, 2010Natur.466..105L, Prominent examples are C. megalodon and L. melvillei. Other notable large sharks were C. chubutensis, Isurus hastalis, and Hemipristis serra.
Crocodilians also showed signs of diversification during Miocene. The largest form among them was a gigantic caiman Purussaurus which inhabited South America.JOURNAL
, Orangel A. Aguilera, Douglas Riff & Jean Bocquentin-Villanueva
, A new giant Pusussaurus (Crocodyliformes, Alligatoridae) from the Upper Miocene Urumaco Formation, Venezuela
, 2006
, Journal of Systematic Palaeontology
, 4
, 3
, 221–232
,weblink
, 10.1017/S147720190600188X
, dead
,weblink" title="web.archive.org/web/20120329034001weblink">weblink
, 2012-03-29
, Another gigantic form was a false gharial Rhamphosuchus, which inhabited modern age India. A strange form, Mourasuchus also thrived alongside Purussaurus. This species developed a specialized filter-feeding mechanism, and it likely preyed upon small fauna despite its gigantic size.The pinnipeds, which appeared near the end of the Oligocene, became more aquatic. Prominent genus was Allodesmus.JOURNAL
, Lawrence G. Barnes, Kiyoharu Hirota
, yes, Miocene pinnipeds of the otariid subfamily Allodesminae in the North Pacific Ocean: systematics and relationships
, 1994, Island Arc, 3, 4, 329–360
, 10.1111/j.1440-1738.1994.tb00119.x, A ferocious walrus, Pelagiarctos may have preyed upon other species of pinnipeds including Allodesmus.
Furthermore, South American waters witnessed the arrival of Megapiranha paranensis, which were considerably larger than modern age piranhas.New Zealand's Miocene fossil record is particularly rich. Marine deposits showcase a variety of cetaceans and penguins, illustrating the evolution of both groups into modern representatives. The early Miocene Saint Bathans Fauna is the only Cenozoic terrestrial fossil record of the landmass, showcasing a wide variety of not only bird species, including early representatives of clades such as moas, kiwis and adzebills, but also a diverse herpetofauna of sphenodontians, crocodiles and turtle as well as a rich terrestrial mammal fauna composed of various species of bats and the enigmatic Saint Bathans Mammal.

Oceans

There is evidence from oxygen isotopes at Deep Sea Drilling Program sites that ice began to build up in Antarctica about 36 Ma during the Eocene. Further marked decreases in temperature during the Middle Miocene at 15 Ma probably reflect increased ice growth in Antarctica. It can therefore be assumed that East Antarctica had some glaciers during the early to mid Miocene (23–15 Ma). Oceans cooled partly due to the formation of the Antarctic Circumpolar Current, and about 15 million years ago the ice cap in the southern hemisphere started to grow to its present form. The Greenland ice cap developed later, in the Middle Pliocene time, about 3 million years ago.

Middle Miocene disruption

The "Middle Miocene disruption" refers to a wave of extinctions of terrestrial and aquatic life forms that occurred following the Miocene Climatic Optimum (18 to 16 Ma), around 14.8 to 14.5 million years ago, during the Langhian stage of the mid-Miocene. A major and permanent cooling step occurred between 14.8 and 14.1 Ma, associated with increased production of cold Antarctic deep waters and a major growth of the East Antarctic ice sheet. A Middle Miocene δ18O increase, that is, a relative increase in the heavier isotope of oxygen, has been noted in the Pacific, the Southern Ocean and the South Atlantic.JOURNAL, Kenneth G. Miller, Richard G. Fairbanks, yes, 1983, Evidence for Oligocene−Middle Miocene abyssal circulation changes in the western North Atlantic, Nature (journal), Nature, 306, 5940, 250–253, 10.1038/306250a0, 1983Natur.306..250M,

Impact event

A large impact event occurred either during the Miocene (23 Ma - 5.3 Ma) or the Pliocene (5.3 Ma - 2.6 Ma). The event formed the Karakul crater (52 km diameter), which is estimated to have an age of less than 23 MaJOURNAL, Karakul: a young complex impact crater in the Pamir, Tajikistan, AGU Fall Meeting Abstracts, 2011, P31A–1701, Bouley, S.; Baratoux, D.; Baratoux, L.; Colas, F.; Dauvergne, J.; Losiak, A.; Vaubaillon, J.; Bourdeille, C.; Jullien, A.; Ibadinov, K. (American Geophysical Union, Fall Meeting 2011), 2011AGUFM.P31A1701B, 2011, or less than 5 Ma.JOURNAL, Gurov, E. P., Gurova, H.P., Rakitskaya, R.B. and Yamnichenko,A.Yu. (1993), The Karakul depression in Pamirs - the first impact structure in central Asia, Lunar and Planetary Science XXIV, Pp. 591-592, 591,weblink 1993LPI....24..591G, 1993,

See also

References

{{Reflist|30em}}

Further reading

  • Cox, C. Barry & Moore, Peter D. (1993): Biogeography. An ecological and evolutionary approach (5th ed.). Blackwell Scientific Publications, Cambridge. {{ISBN|0-632-02967-6}}
  • Ogg, Jim (2004): "weblink" title="web.archive.org/web/20060423084018weblink">Overview of Global Boundary Stratotype Sections and Points (GSSP's)". Retrieved 2006-04-30.

External links

{{Commons category|Miocene}}{{Wikisource portal|Cenozoic#Neogene}} {{Neogene Footer}}{{Geological history|p|c}}{{Authority control}}

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