Last big Ice Age ended 12,000 years ago here on Earth

1.  So, that means to me that there could have been world wide civilizations that were wiped out by the last ice age where people went to other planets with their technology developed then. This seems both possible and plausible to me. It is also possible that ice ages end all big civilizations like ours eventually. Imagine billions of people no longer able to raise food because the ground is frozen over most of the  world for 100,000 years and only maybe the equator region has stuff growing much at all. If the shift came quickly or swiftly the civilization wouldn't have any time to adapt a way forward. When I think of mammoths being rendered extinct mostly in one day like evidence suggests what could have happened to humans during this same mammoth extinction?

1.  Last glacial period - Wikipedia, the free...

   en.wikipedia.org/wiki/Last_glacial_periodCached

   The last glacial period, popularly known as the Ice Age was the most recent glacial period within the current ice age occurring during the last one hundred thousand ... 

   Last glacial period

   From Wikipedia, the free encyclopedia

   For the most recent period cooler than present but without significant glaciation, see Little Ice Age.

   "The Ice Age" redirects here. For the generic geological period of temperature reduction, see Ice age.

   "Last glacial" redirects here. For the period of maximum glacier extent during this time, see Last Glacial Maximum.

   The last glacial period, popularly known as the Ice Age was the most recent glacial period within the current ice age occurring during the last one hundred thousand years of the Pleistocene, from approximately 110,000 to 12,000 years ago.^[1] Scientists consider this "ice age" to be merely the latest glaciation event in a much larger ice age, one that dates back over two million years and has seen multiple glaciations.
   During this period, there were several changes between glacier advance and retreat. The maximum extent of glaciation within this last glacial period was approximately 22,000 years ago. While the general pattern of global cooling and glacier advance was similar, local differences in the development of glacier advance and retreat makes it difficult to compare the details from continent to continent (see picture of ice core data below for differences).
   From the point of view of human archaeology, it falls in the Paleolithic and Mesolithic periods. When the glaciation event started, Homo sapiens was confined to Africa and used tools comparable to those used by Neanderthals in Europe and the Levant and by Homo erectus in Asia. Near the end of the event, Homo sapiens spread into Europe, Asia, and Australia. The retreat of the glaciers allowed groups of Asians to migrate to the Americas and populate them.
   

   

   An artist's impression of the last glacial period at glacial maximum.^[2]

   Contents

   • 1 Origin and definition
   • 2 Overview
   • 3 Named local glaciations
     • 3.1 Antarctica glaciation
     • 3.2 Europe
       • 3.2.1 Devensian & Midlandian glaciation (Britain and Ireland)
       • 3.2.2 Weichselian glaciation (Scandinavia and northern Europe)
       • 3.2.3 Würm glaciation (Alps)
     • 3.3 North America
       • 3.3.1 Pinedale or Fraser glaciation (Rocky Mountains)
       • 3.3.2 Wisconsin glaciation
       • 3.3.3 Tahoe, Tenaya, and Tioga, Sierra Nevada
       • 3.3.4 Greenland glaciation
     • 3.4 South America
       • 3.4.1 Mérida glaciation (Venezuelan Andes)
       • 3.4.2 Llanquihue glaciation (Southern Andes)
   • 4 See also
   • 5 References
   • 6 Further reading
   • 7 External links

   Origin and definition

   The last glacial period is sometimes colloquially referred to as the "last ice age", though this use is incorrect because an ice age is a longer period of cold temperature in which ice sheets cover large parts of the Earth, such as Antarctica. Glacials, on the other hand, refer to colder phases within an ice age that separate interglacials. Thus, the end of the last glacial period is not the end of the last ice age. The end of the last glacial period was about 10,500 BCE, while the end of the last ice age has not yet come: little evidence points to a stop of the glacial-interglacial cycle of the last million years.
   The last glacial period is the best-known part of the current ice age, and has been intensively studied in North America, northern Eurasia, the Himalaya and other formerly glaciated regions around the world. The glaciations that occurred during this glacial period covered many areas, mainly in the Northern Hemisphere and to a lesser extent in the Southern Hemisphere. They have different names, historically developed and depending on their geographic distributions: Fraser (in the Pacific Cordillera of North America), Pinedale (in the Central Rocky Mountains), Wisconsinan or Wisconsin (in central North America), Devensian (in the British Isles), Midlandian (in Ireland), Würm (in the Alps), Mérida (in Venezuela), Weichselian or Vistulian (in Northern Europe and northern Central Europe), Valdai in Eastern Europe and Zyryanka in Siberia, Llanquihue in Chile, and Otira in New Zealand. The geochronological Late Pleistocene comprises the late glacial (Weichselian) and the immediately preceding penultimate interglacial (Eemian) preiond.
   

   Overview

   

   Vegetation types at time of last glacial maximum

   

   Last glacial period, as seen in ice core data from Antarctica and Greenland

   The last glaciation centered on the huge ice sheets of North America and Eurasia. Considerable areas in the Alps, the Himalaya and the Andes were ice-covered, and Antarctica remained glaciated.
   Canada was nearly completely covered by ice, as well as the northern part of the United States, both blanketed by the huge Laurentide ice sheet. Alaska remained mostly ice free due to arid climate conditions. Local glaciations existed in the Rocky Mountains and the Cordilleran ice sheet and as ice fields and ice caps in the Sierra Nevada in northern California.^[3] In Britain, mainland Europe, and northwestern Asia, the Scandinavian ice sheet once again reached the northern parts of the British Isles, Germany, Poland, and Russia, extending as far east as the Taimyr Peninsula in western Siberia.^[4] The maximum extent of western Siberian glaciation was reached approximately 16,000 to 15,000 BCE and thus later than in Europe (20,000–16,000 BCE).^[5] Northeastern Siberia was not covered by a continental-scale ice sheet.^[6] Instead, large, but restricted, icefield complexes covered mountain ranges within northeast Siberia, including the Kamchatka-Koryak Mountains.^[7][8]
   The Arctic Ocean between the huge ice sheets of America and Eurasia was not frozen throughout, but like today probably was only covered by relatively shallow ice, subject to seasonal changes and riddled with icebergs calving from the surrounding ice sheets. According to the sediment composition retrieved from deep-sea cores there must even have been times of seasonally open waters.^[9]
   Outside the main ice sheets, widespread glaciation occurred on the Alps-Himalaya mountain chain. In contrast to the earlier glacial stages, the Würm glaciation was composed of smaller ice caps and mostly confined to valley glaciers, sending glacial lobes into the Alpine foreland. To the east the Caucasus and the mountains of Turkey and Iran were capped by local ice fields or small ice sheets.^[10] In the Himalaya and the Tibetan Plateau, glaciers advanced considerably, particularly between 45,000–25,000 BCE,^[11] but these datings are controversial.^[12][13] The formation of a contiguous ice sheet on the Tibetan Plateau^[14][15] is controversial.^[16]
   Other areas of the Northern Hemisphere did not bear extensive ice sheets, but local glaciers in high areas. Parts of Taiwan, for example, were repeatedly glaciated between 42,250 and 8,680 BCE^[17] as well as the Japanese Alps. In both areas maximum glacier advance occurred between 58,000 and 28,000 BCE^[18] (starting roughly during the Toba catastrophe). To a still lesser extent glaciers existed in Africa, for example in the High Atlas, the mountains of Morocco, the Mount Atakor massif in southern Algeria, and several mountains in Ethiopia. In the Southern Hemisphere, an ice cap of several hundred square kilometers was present on the east African mountains in the Kilimanjaro Massif, Mount Kenya and the Ruwenzori Mountains, still bearing remnants of glaciers today.^[19]
   Glaciation of the Southern Hemisphere was less extensive because of current configuration of continents. Ice sheets existed in the Andes (Patagonian Ice Sheet), where six glacier advances between 31,500 and 11,900 BCE in the Chilean Andes have been reported.^[20] Antarctica was entirely glaciated, much like today, but the ice sheet left no uncovered area. In mainland Australia only a very small area in the vicinity of Mount Kosciuszko was glaciated, whereas in Tasmania glaciation was more widespread.^[21] An ice sheet formed in New Zealand, covering all of the Southern Alps, where at least three glacial advances can be distinguished.^[22] Local ice caps existed in Irian Jaya, Indonesia, where in three ice areas remnants of the Pleistocene glaciers are still preserved today.^[23]
   

   Named local glaciations

   Antarctica glaciation

   During the last glacial period Antarctica was blanketed by a massive ice sheet, much as it is today. The ice covered all land areas and extended into the ocean onto the middle and outer continental shelf.^[24][25] According to ice modelling, ice over central East Antarctica was generally thinner than today.^[26]
   

   Europe

   Devensian & Midlandian glaciation (Britain and Ireland)

   The name Devensian glaciation is used by British geologists and archaeologists and refers to what is often popularly meant by the latest Ice Age. Irish geologists, geographers, and archaeologists refer to the Midlandian glaciation as its effects in Ireland are largely visible in the Irish Midlands. The name Devensian is derived from the Latin Dēvenses, people living by the Dee (Dēva in Latin), a river on the Welsh border near which deposits from the period are particularly well represented.^[27]
   The effects of this glaciation can be seen in many geological features of England, Wales, Scotland, and Northern Ireland. Its deposits have been found overlying material from the preceding Ipswichian Stage and lying beneath those from the following Flandrian stage of the Holocene.
   The latter part of the Devensian includes Pollen zones I-IV, the Allerød and Bølling Oscillations, and the Older and Younger Dryas climatic stages.
   

   Weichselian glaciation (Scandinavia and northern Europe)

   Main article: Weichselian glaciation

   

   Europe during the last glacial period

   Alternative names include: Weichsel glaciation or Vistulian glaciation (referring to the Polish river Vistula or its German name Weichsel). Evidence suggests that the ice sheets were at their maximum size for only a short period, between 25,000 to 13,000 BP. Eight interstadials have been recognized in the Weichselian, including: the Oerel, Glinde, Moershoofd, Hengelo and Denekamp; however correlation with isotope stages is still in process.^[28][29] During the glacial maximum in Scandinavia, only the western parts of Jutland were ice-free, and a large part of what is today the North Sea was dry land connecting Jutland with Britain (see Doggerland). It is also in Denmark that the only Scandinavian ice-age animals older than 13,000 BC are found.^{[citation needed]}
   The Baltic Sea, with its unique brackish water, is a result of meltwater from the Weichsel glaciation combining with saltwater from the North Sea when the straits between Sweden and Denmark opened. Initially, when the ice began melting about 10,300 BP, seawater filled the isostatically depressed area, a temporary marine incursion that geologists dub the Yoldia Sea. Then, as post-glacial isostatic rebound lifted the region about 9500 BP, the deepest basin of the Baltic became a freshwater lake, in palaeological contexts referred to as Ancylus Lake, which is identifiable in the freshwater fauna found in sediment cores. The lake was filled by glacial runoff, but as worldwide sea level continued rising, saltwater again breached the sill about 8000 BP, forming a marine Littorina Sea which was followed by another freshwater phase before the present brackish marine system was established. "At its present state of development, the marine life of the Baltic Sea is less than about 4000 years old," Drs. Thulin and Andrushaitis remarked when reviewing these sequences in 2003.
   Overlying ice had exerted pressure on the Earth's surface. As a result of melting ice, the land has continued to rise yearly in Scandinavia, mostly in northern Sweden and Finland where the land is rising at a rate of as much as 8–9 mm per year, or 1 meter in 100 years. This is important for archaeologists since a site that was coastal in the Nordic Stone Age now is inland and can be dated by its relative distance from the present shore.
   

   Würm glaciation (Alps)

   Main article: Würm glaciation

   

   Extent of Alpine glaciation during the Würm ice age. Blue: extent of the early ice ages

   The term Würm is derived from a river in the Alpine foreland, approximately marking the maximum glacier advance of this particular glacial period. The Alps were where the first systematic scientific research on ice ages was conducted by Louis Agassiz at the beginning of the 19th century. Here the Würm glaciation of the last glacial period was intensively studied. Pollen analysis, the statistical analyses of microfossilized plant pollens found in geological deposits, chronicled the dramatic changes in the European environment during the Würm glaciation. During the height of Würm glaciation, c. 24,000–10,000 BP, most of western and central Europe and Eurasia was open steppe-tundra, while the Alps presented solid ice fields and montane glaciers. Scandinavia and much of Britain were under ice.
   During the Würm, the Rhône Glacier covered the whole western Swiss plateau, reaching today's regions of Solothurn and Aarau. In the region of Bern it merged with the Aar glacier. The Rhine Glacier is currently the subject of the most detailed studies. Glaciers of the Reuss and the Limmat advanced sometimes as far as the Jura. Montane and piedmont glaciers formed the land by grinding away virtually all traces of the older Günz and Mindel glaciation, by depositing base moraines and terminal moraines of different retraction phases and loess deposits, and by the pro-glacial rivers' shifting and redepositing gravels. Beneath the surface, they had profound and lasting influence on geothermal heat and the patterns of deep groundwater flow.
   

   North America

   Pinedale or Fraser glaciation (Rocky Mountains)

   The Pinedale (central Rocky Mountains) or Fraser (Cordilleran ice sheet) glaciation was the last of the major glaciations to appear in the Rocky Mountains in the United States. The Pinedale lasted from approximately 30,000 to 10,000 years ago and was at its greatest extent between 23,500 and 21,000 years ago.^[30] This glaciation was somewhat distinct from the main Wisconsin glaciation as it was only loosely related to the giant ice sheets and was instead composed of mountain glaciers, merging into the Cordilleran Ice Sheet.^[31] The Cordilleran ice sheet produced features such as glacial Lake Missoula, which would break free from its ice dam causing the massive Missoula floods. USGS Geologists estimate that the cycle of flooding and reformation of the lake lasted an average of 55 years and that the floods occurred approximately 40 times over the 2,000 year period between 15,000 and 13,000 years ago.^[32] Glacial lake outburst floods such as these are not uncommon today in Iceland and other places.
   

   Wisconsin glaciation

   The Wisconsin Glacial Episode was the last major advance of continental glaciers in the North American Laurentide ice sheet. At the height of glaciation the Bering land bridge potentially permitted migration of mammals, including people, to North America from Siberia.
   It radically altered the geography of North America north of the Ohio River. At the height of the Wisconsin Episode glaciation, ice covered most of Canada, the Upper Midwest, and New England, as well as parts of Montana and Washington. On Kelleys Island in Lake Erie or in New York's Central Park, the grooves left by these glaciers can be easily observed. In southwestern Saskatchewan and southeastern Alberta a suture zone between the Laurentide and Cordilleran ice sheets formed the Cypress Hills, which is the northernmost point in North America that remained south of the continental ice sheets.
   The Great Lakes are the result of glacial scour and pooling of meltwater at the rim of the receding ice. When the enormous mass of the continental ice sheet retreated, the Great Lakes began gradually moving south due to isostatic rebound of the north shore. Niagara Falls is also a product of the glaciation, as is the course of the Ohio River, which largely supplanted the prior Teays River.
   With the assistance of several very broad glacial lakes, it released floods through the gorge of the Upper Mississippi River, which in turn was during an earlier glacial period.
   In its retreat, the Wisconsin Episode glaciation left terminal moraines that form Long Island, Block Island, Cape Cod, Nomans Land, Martha's Vineyard, Nantucket, Sable Island and the Oak Ridges Moraine in south central Ontario, Canada. In Wisconsin itself, it left the Kettle Moraine. The drumlins and eskers formed at its melting edge are landmarks of the Lower Connecticut River Valley.
   

   Tahoe, Tenaya, and Tioga, Sierra Nevada

   In the Sierra Nevada, there are three named stages of glacial maxima (sometimes incorrectly called ice ages) separated by warmer periods. These glacial maxima are called, from oldest to youngest, Tahoe, Tenaya, and Tioga.^[33] The Tahoe reached its maximum extent perhaps about 70,000 years ago. Little is known about the Tenaya. The Tioga was the least severe and last of the Wisconsin Episode. It began about 30,000 years ago, reached its greatest advance 21,000 years ago, and ended about 10,000 years ago.
   

   Greenland glaciation

   In Northwest Greenland, ice coverage attained a very early maximum in the last glacial period around 114,000. After this early maximum, the ice coverage was similar to today until the end of the last glacial period. Towards the end, glaciers readvanced once more before retreating to their present extent.^[34] According to ice core data, the Greenland climate was dry during the last glacial period, precipitation reaching perhaps only 20% of today's value.^[35]
   

   South America

   Mérida glaciation (Venezuelan Andes)

   

   The extent of the glaciers in Venezuelan Andes area during the last glacial period.

   The name Mérida Glaciation is proposed to designate the alpine glaciation which affected the central Venezuelan Andes during the Late Pleistocene. Two main moraine levels have been recognized: one between 2600 and 2700 m, and another between 3000 and 3500 m elevation. The snow line during the last glacial advance was lowered approximately 1200 m below the present snow line (3700 m). The glaciated area in the Cordillera de Mérida was approximately 600 km²; this included the following high areas from southwest to northeast: Páramo de Tamá, Páramo Batallón, Páramo Los Conejos, Páramo Piedras Blancas, and Teta de Niquitao. Approximately 200 km² of the total glaciated area was in the Sierra Nevada de Mérida, and of that amount, the largest concentration, 50 km², was in the areas of Pico Bolívar, Pico Humboldt (4,942 m), and Pico Bonpland (4,893 m). Radiocarbon dating indicates that the moraines are older than 10,000 years B.P., and probably older than 13,000 years B.P. The lower moraine level probably corresponds to the main Wisconsin glacial advance. The upper level probably represents the last glacial advance (Late Wisconsin).^{[36][37][38][39]}
   

   Llanquihue glaciation (Southern Andes)

   

   Map showing the extent of the Patagonian Ice Sheet in the Strait of Magellan area during the last glacial period. Selected modern settlements are shown with yellow dots.

   The Llanquihue glaciation takes its name from Llanquihue Lake in southern Chile which is a fan-shaped piedmont glacial lake. On the lake's western shores there are large moraine systems of which the innermost belong to the last glacial period. Llanquihue Lake's varves are a node point in southern Chile's varve geochronology. During the last glacial maximum the Patagonian Ice Sheet extended over the Andes from about 35°S to Tierra del Fuego at 55°S. The western part appears to have been very active, with wet basal conditions, while the eastern part was cold based. Palsas seems to have developed at least in the unglaciated parts of Isla Grande de Tierra del Fuego. The area west of Llanquihue Lake was ice-free during the LGM, and had sparsely distributed vegetation dominated by Nothofagus. Valdivian temperate rainforest was reduced to scattered remnants in the western side of the Andes.^[40]
   

   

   Modelled maximum extent of the Antarctic ice sheet 21,000 years before present

   See also

   • Current sea level rise
   • Glacial history of Minnesota
   • Glacial lake outburst flood
   • Glacial period
   • Ice age
   • Last Glacial Maximum
   • Timeline of glaciation
   • Valparaiso Moraine

   References

   1. 
      
2. Clayton, Lee; Attig, John W.; Mickelson, David M.; Johnson, Mark D.; Syverson, Kent M. "Glaciation of Wisconsin" (PDF). Dept. Geology, University of Wisconsin.

40. "South America during the last 150,000 years".

Further reading

• Bowen, D.Q. (1978). Quaternary geology: a stratigraphic framework for multidisciplinary work. Oxford UK: Pergamon Press. ISBN 978-0-08-020409-3.
• Ehlers, J.; Gibbard, P.L., eds. (2004). Quaternary Glaciations: Extent and Chronology 2: Part II North America. Amsterdam: Elsevier. ISBN 0-444-51462-7.
• Ehlers, J.; Gibbard, P.L., eds. (2004). Quaternary Glaciations: Extent and Chronology 3: Part III: South America, Asia, Africa, Australia, Antarctica. Amsterdam: Elsevier. ISBN 0-444-51593-3.
• Gillespie, A.R., Porter, S.C.; Atwater, B.F. (2004). The Quaternary Period in the United States [of America]. Developments in Quaternary Science 1. Amsterdam: Elsevier. ISBN 978-0-444-51471-4.
• Harris, A.G.; Tuttle, E.; Tuttle, S.D. (1997). Geology of National Parks (5th ed.). Iowa: Kendall/Hunt. ISBN 0-7872-5353-7.
• Kuhle, M. (1988). "The Pleistocene Glaciation of Tibet and the Onset of Ice Ages — An Autocycle HypothesisGeoJournal". GeoJournal 17 (4): 581–596. doi:10.1007/BF00209444.
• Mangerud, J.; Ehlers, J.; Gibbard, P., ed. (2004). Quaternary Glaciations : Extent and Chronology 1: Part I Europe. Amsterdam: Elsevier. ISBN 0-444-51462-7.
• Sibrava, V.; Bowen, D.Q; Richmond, G.M. (1986). "Quaternary Glaciations in the Northern Hemisphere". Quaternary Science Reviews 5: 1–514. doi:10.1016/S0277-3791(86)80002-6.
• Pielou, E.C. (1991). After the Ice Age : The Return of Life to Glaciated North America. Chicago IL: University Of Chicago Press. ISBN 0-226-66812-6.

External links

Wikimedia Commons has media related to Ice age 72k-12k BP.

• Pielou, E. C. After the Ice Age: The Return of Life to Glaciated North America. (University of Chicago Press: 1992)
• National Atlas of the USA: Wisconsin Glaciation in North America: Present state of knowledge
• Ray, N.; Adams, J.M. (2001). "A GIS-based Vegetation Map of the World at the Last Glacial Maximum (25,000–15,000 BP)" (PDF). Internet Archaeology 11.

[hide] v t e Ice ages Quaternary Current Antarctica Greenland Iceland Pleistocene Last glacial period 1st: Würm, Wisconsin, Weichselian, Devensian/Midlandian, Pinedale/Fraser, Greenland, Merida, Llanquihue 2nd: Riss, Illinoian, Saale, Wolstonian, Santa María 3rd-6th: Mindel, Pre-Illinoian, Elster, Anglian, Rio Llico 7th-8th: Günz, Pre-Illinoian, Elbe or Menapian, Beestonian, Caracol Carboniferous Karoo (360 Mya to 260 Mya) Ordovician-Silurian Andean-Saharan (460 Mya to 430 Mya) Ediacaran Gaskiers (582 to 580 Mya) Cryogenian Kaigas; Sturtian (720 to 660 Mya); Marinoan (650 to 635 Mya) Paleoproterozoic Huronian (2400 Mya to 2100 Mya) Related topics Greenhouse and icehouse Earth Great Oxygenation Event Interglacial Milankovitch cycles Stadial Timeline of glaciation

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OED

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