Misplaced Pages

#332667

62-739: The race has a course on winding roads through the two Veluwe national parks, Hoge Veluwe National Park and Veluwezoom National Park , and the Nederrijn river valley in the south east corner of Utrecht province over a distance of roughly 209 km, interspersed with little steep cobbled climbs, the most significant of which are the Grebbeberg and the Posbank in Rhenen , and the Emma Pyramid in Rozendaal . Although

124-635: A type section , Global Boundary Stratotype Section and Point (GSSP), for the upper Pleistocene/Holocene boundary ( i.e. the upper boundary). The proposed section is the North Greenland Ice Core Project ice core 75° 06' N 42° 18' W. The lower boundary of the Pleistocene Series is formally defined magnetostratigraphically as the base of the Matuyama (C2r) chronozone , isotopic stage 103. Above this point there are notable extinctions of

186-585: A change from low-amplitude glacial cycles with a dominant periodicity of 41,000 years to asymmetric high-amplitude cycles dominated by a periodicity of 100,000 years. However, a 2020 study concluded that ice age terminations might have been influenced by obliquity since the Mid-Pleistocene Transition, which caused stronger summers in the Northern Hemisphere . Glaciation in the Pleistocene

248-574: A deviation from today's annual mean temperature, taken as zero. This sort of graph is based on another isotope ratio versus time. Ratios are converted to a percentage difference from the ratio found in standard mean ocean water (SMOW). The graph in either form appears as a waveform with overtones . One half of a period is a Marine isotopic stage (MIS). It indicates a glacial (below zero) or an interglacial (above zero). Overtones are stadials or interstadials. According to this evidence, Earth experienced 102 MIS stages beginning at about 2.588 Ma BP in

310-725: A fenced area in the Radio Kootwijk Reserve and the golden jackal is reaching the area, from which they are not native, but since the jackals reach the area all by their own they are seen as a welcome and new native species. Parts of the Veluwe that have been separated from each other by roads, towns and farmland are being reconnected by returning farmland to nature and creating wildlife crossings over highways. In 2012, nine of these overpasses had been built, each one about 50 metres (200') wide and covered with sand and vegetation to encourage animals to use it. Wildlife corridors connecting

372-421: A few regions had been studied and the names were relatively few. Today the geologists of different nations are taking more of an interest in Pleistocene glaciology. As a consequence, the number of names is expanding rapidly and will continue to expand. Many of the advances and stadials remain unnamed. Also, the terrestrial evidence for some of them has been erased or obscured by larger ones, but evidence remains from

434-543: A large sports complex and Olympic Games training facility, is located in the south of the Veluwe near Arnhem . 52°06′N 5°54′E  /  52.1°N 5.9°E  / 52.1; 5.9 Pleistocene The Pleistocene ( / ˈ p l aɪ s t ə ˌ s iː n , - s t oʊ -/ PLY -stə-seen, -⁠stoh- ; referred to colloquially as the Ice Age ) is the geological epoch that lasted from c.  2.58 million to 11,700 years ago, spanning

496-438: A more sensitive natural area have been removed; taking down remaining fences, as around De Hoge Veluwe ; an old industrial zone near the village of Renkum was cleared away because it blocked a valley that was important for the migration of wildlife; and a military complex near Nunspeet was removed instead of being redeveloped as a business area. The Veluwe is a tourist destination, especially for Dutch people wanting to go on

558-468: A short vacation in their own country. Campsites and bungalow parks are the preferred place to stay for most visitors. There are more than 500 of these sites, most located on the outskirts of the natural area. Tourist attractions in the area include four zoos, over 50 museums including the Kröller-Müller art museum , and the royal palace Het Loo at Apeldoorn . The National Sports Centre Papendal ,

620-568: A team of Russian scientists in collaboration with Princeton University announced that they had brought two female nematodes frozen in permafrost , from around 42,000 years ago, back to life. The two nematodes, at the time, were the oldest confirmed living animals on the planet. The evolution of anatomically modern humans took place during the Pleistocene. At the beginning of the Pleistocene Paranthropus species were still present, as well as early human ancestors, but during

682-765: Is estimated that, at maximum glacial extent, 30% of the Earth's surface was covered by ice. In addition, a zone of permafrost stretched southward from the edge of the glacial sheet, a few hundred kilometres in North America , and several hundred in Eurasia . The mean annual temperature at the edge of the ice was −6 °C (21 °F); at the edge of the permafrost, 0 °C (32 °F). Each glacial advance tied up huge volumes of water in continental ice sheets 1,500 to 3,000 metres (4,900–9,800 ft) thick, resulting in temporary sea-level drops of 100 metres (300 ft) or more over

SECTION 10

#1733092530333

744-454: Is no systematic correspondence between pluvials to glacials, however. Moreover, regional pluvials do not correspond to each other globally. For example, some have used the term "Riss pluvial" in Egyptian contexts. Any coincidence is an accident of regional factors. Only a few of the names for pluvials in restricted regions have been stratigraphically defined. The sum of transient factors acting at

806-611: Is the largest push moraine complex in the Netherlands, stretching 60 km (40 miles) from north to south, and reaching heights of up to 110 metres (360'). The Veluwe was formed by the Saalian glacial during the Pleistocene epoch , some 200,000 years ago. Glaciers some 200 metres (600') thick pushed the sand deposits in the Rhine and Maas Delta sideways, creating the hills which now form most of

868-638: The Alpine ice sheet on the Alps . Scattered domes stretched across Siberia and the Arctic shelf. The northern seas were ice-covered. South of the ice sheets large lakes accumulated because outlets were blocked and the cooler air slowed evaporation. When the Laurentide Ice Sheet retreated, north-central North America was completely covered by Lake Agassiz . Over a hundred basins, now dry or nearly so, were overflowing in

930-635: The Ruwenzori Range in east and central Africa were larger. Glaciers existed in the mountains of Ethiopia and to the west in the Atlas Mountains . In the northern hemisphere, many glaciers fused into one. The Cordilleran Ice Sheet covered the North American northwest; the east was covered by the Laurentide . The Fenno-Scandian ice sheet rested on northern Europe , including much of Great Britain;

992-469: The World Championships . Between 1985 and 2006 the race was known as Veenendaal–Veenendaal. Over the years it has been run at three different times on the international cycling calendar. In 1994 the event was moved to mid-April and given a date on a Thursday, the day after La Flèche Wallonne and a few days before Liège–Bastogne–Liège . The race organisers were never happy with this because it reduced

1054-437: The calcareous nannofossils : Discoaster pentaradiatus and Discoaster surculus . The Pleistocene covers the recent period of repeated glaciations. The name Plio-Pleistocene has, in the past, been used to mean the last ice age. Formerly, the boundary between the two epochs was drawn at the time when the foraminiferal species Hyalinea baltica first appeared in the marine section at La Castella, Calabria, Italy. However,

1116-477: The last glacial period ended about 10,000 years ago. Over 11 major glacial events have been identified, as well as many minor glacial events. A major glacial event is a general glacial excursion, termed a "glacial." Glacials are separated by "interglacials". During a glacial, the glacier experiences minor advances and retreats. The minor excursion is a "stadial"; times between stadials are "interstadials". These events are defined differently in different regions of

1178-411: The roe deer , red deer and fallow deer ), several species of snakes (including the common viper ), pine martens , foxes , and badgers . Furthermore, the bird raven was successfully reintroduced, and the introduced Reeves's muntjac and mouflon can sometimes be seen. Furthermore, there live semi-wild and wild cattle and horses like both semi-wild and wild Highland cattle in multiple areas of

1240-588: The woolly rhinoceros , various giraffids , such as the Sivatherium ; ground sloths , Irish elk , cave lions , cave bears , Gomphotheres , American lions , dire wolves , and short-faced bears , began late in the Pleistocene and continued into the Holocene. Neanderthals also became extinct during this period. At the end of the last ice age, cold-blooded animals, smaller mammals like wood mice , migratory birds, and swifter animals like whitetail deer had replaced

1302-701: The "Tarantian"). In addition to these international subdivisions, various regional subdivisions are often used. In 2009 the International Union of Geological Sciences (IUGS) confirmed a change in time period for the Pleistocene, changing the start date from 1.806 to 2.588 million years BP, and accepted the base of the Gelasian as the base of the Pleistocene, namely the base of the Monte San Nicola GSSP . The start date has now been rounded down to 2.580 million years BP. The IUGS has yet to approve

SECTION 20

#1733092530333

1364-558: The Early Pleistocene Gelasian . Early Pleistocene stages were shallow and frequent. The latest were the most intense and most widely spaced. By convention, stages are numbered from the Holocene, which is MIS1. Glacials receive an even number and interglacials receive an odd number. The first major glacial was MIS2-4 at about 85–11 ka BP. The largest glacials were 2, 6, 12, and 16. The warmest interglacials were 1, 5, 9 and 11. For matching of MIS numbers to named stages, see under

1426-402: The Earth's most recent period of repeated glaciations . Before a change was finally confirmed in 2009 by the International Union of Geological Sciences , the cutoff of the Pleistocene and the preceding Pliocene was regarded as being 1.806 million years Before Present (BP). Publications from earlier years may use either definition of the period. The end of the Pleistocene corresponds with

1488-409: The Earth's surface is cyclical: climate, ocean currents and other movements, wind currents, temperature, etc. The waveform response comes from the underlying cyclical motions of the planet, which eventually drag all the transients into harmony with them. The repeated glaciations of the Pleistocene were caused by the same factors. The Mid-Pleistocene Transition , approximately one million years ago, saw

1550-479: The North American west. Lake Bonneville , for example, stood where Great Salt Lake now does. In Eurasia, large lakes developed as a result of the runoff from the glaciers. Rivers were larger, had a more copious flow, and were braided . African lakes were fuller, apparently from decreased evaporation. Deserts, on the other hand, were drier and more extensive. Rainfall was lower because of the decreases in oceanic and other evaporation. It has been estimated that during

1612-490: The Pleistocene's overall climate could be characterised as a continuous El Niño with trade winds in the south Pacific weakening or heading east, warm air rising near Peru , warm water spreading from the west Pacific and the Indian Ocean to the east Pacific, and other El Niño markers. Pleistocene climate was marked by repeated glacial cycles in which continental glaciers pushed to the 40th parallel in some places. It

1674-782: The Pleistocene, the East Antarctic Ice Sheet thinned by at least 500 meters, and that thinning since the Last Glacial Maximum is less than 50 meters and probably started after ca 14 ka. During the 2.5 million years of the Pleistocene, numerous cold phases called glacials ( Quaternary ice age ), or significant advances of continental ice sheets, in Europe and North America, occurred at intervals of approximately 40,000 to 100,000 years. The long glacial periods were separated by more temperate and shorter interglacials which lasted about 10,000–15,000 years. The last cold episode of

1736-411: The Pleistocene, the plates upon which they sit probably having moved no more than 100 km (62 mi) relative to each other since the beginning of the period. In glacial periods, the sea level would drop by up to 120 m (390 ft) lower than today during peak glaciation, exposing large areas of the present continental shelf as dry land. According to Mark Lynas (through collected data),

1798-620: The Pleistocene. The climate was strongly variable depending on the glacial cycle, with the sea levels being up to 120 metres (390 ft) lower than present at peak glaciation, allowing the connection of Asia and North America via Beringia and the covering of most of northern North America by the Laurentide Ice Sheet . Charles Lyell introduced the term "Pleistocene" in 1839 to describe strata in Sicily that had at least 70% of their molluscan fauna still living today. This distinguished it from

1860-498: The Veluwe to other wildlife areas such as the Oostvaardersplassen in the Netherlands are being developed and further connections to Germany are an option. It is hoped that by doing so the genetic diversity of the wildlife population will increase. In order to turn the entire Veluwe into one IUCN ( Category II ) standard National Park a number of actions have been taken, or are planned, including: bungalow parks located in

1922-419: The Veluwe, semi-wild Sayaguesa cattle and two semi-wild horse breeds: New-forest pony and Icelandic pony . Since 2019 the wolf is officially back with a female and male pair in the northern Veluwe (spring 2019) who had their offspring in the summer of 2019 and one female wolf in middle Veluwe. The prognosis are that many more wolves will reclaim the area. The European bison is also reintroduced as pilot in

Arnhem–Veenendaal Classic - Misplaced Pages Continue

1984-475: The Veluwe. Because the hills are made of sand, rain water disappears rapidly, and then it flows at a depth of tens of metres (yards) to the edges where it reaches the surface again. Originally the Veluwe was surrounded by a string of swamps, heavily populated with game such as deer and wild boar because these areas offered rich vegetation to feed on. Since the 1990s many plans are underway, or have already been implemented, to restore these wetlands by blocking

2046-525: The Younger Dryas is the official start of the current Holocene Epoch . Although it is considered an epoch, the Holocene is not significantly different from previous interglacial intervals within the Pleistocene. In the ICS timescale, the Pleistocene is divided into four stages or ages , the Gelasian , Calabrian , Chibanian (previously the unofficial "Middle Pleistocene"), and Upper Pleistocene (unofficially

2108-687: The appearance of Homo sapiens about 300,000 years ago. Artifacts associated with modern human behavior are unambiguously attested starting 40,000–50,000 years ago. According to mitochondrial timing techniques, modern humans migrated from Africa after the Riss glaciation in the Middle Palaeolithic during the Eemian Stage , spreading all over the ice-free world during the late Pleistocene. A 2005 study posits that humans in this migration interbred with archaic human forms already outside of Africa by

2170-515: The articles for those names. Both marine and continental faunas were essentially modern but with many more large land mammals such as Mammoths , Mastodons , Diprotodons , Smilodons , tigers , lions , Aurochs , short-faced bears , giant sloths , species within Gigantopithecus and others. Isolated landmasses such as Australia , Madagascar , New Zealand and islands in the Pacific saw

2232-575: The city of Arnhem is featured in the title of the race, it both starts and finishes in the town of Veenendaal , but goes to and from Arnhem during the race. It also passes close to Wageningen , the centre of the Food Valley , which formerly sponsored the name of the race. The race was created in 1985 by the Royal Dutch Cycling Union who wanted to create a preparation race in August just before

2294-527: The climate variation more extreme. The Late Pleistocene witnessed the spread of modern humans outside of Africa as well as the extinction of all other human species. Humans also spread to the Australian continent and the Americas for the first time, co-incident with the extinction of most large-bodied animals in these regions. The aridification and cooling trends of the preceding Neogene were continued in

2356-478: The drainage systems built by farmers during the last 150 years. This results in very dry heathland changing into wetland within a span of just a few hundred metres (yards). The Wisselse Veen near the village of Epe , on the northeastern Veluwe, offers a good example of this. Veluwe derives from Proto-Germanic * falwaz (pale, fallow) and * awjō (island). The name corresponds to "fallow lands" in English and probably

2418-529: The end of the last glacial period and also with the end of the Paleolithic age used in archaeology . The name is a combination of Ancient Greek πλεῖστος ( pleîstos ) 'most' and καινός ( kainós ; Latinized as cænus ) 'new'. At the end of the preceding Pliocene, the previously isolated North and South American continents were joined by the Isthmus of Panama , causing a faunal interchange between

2480-606: The entire surface of the Earth. During interglacial times, such as at present, drowned coastlines were common, mitigated by isostatic or other emergent motion of some regions. The effects of glaciation were global. Antarctica was ice-bound throughout the Pleistocene as well as the preceding Pliocene. The Andes were covered in the south by the Patagonian ice cap. There were glaciers in New Zealand and Tasmania . The current decaying glaciers of Mount Kenya , Mount Kilimanjaro , and

2542-772: The evolution of large birds and even reptiles such as the Elephant bird , moa , Haast's eagle , Quinkana , Megalania and Meiolania . The severe climatic changes during the Ice Age had major impacts on the fauna and flora. With each advance of the ice, large areas of the continents became depopulated, and plants and animals retreating southwards in front of the advancing glacier faced tremendous stress. The most severe stress resulted from drastic climatic changes, reduced living space, and curtailed food supply. A major extinction event of large mammals ( megafauna ), which included mammoths , mastodons , saber-toothed cats , glyptodons ,

Arnhem–Veenendaal Classic - Misplaced Pages Continue

2604-414: The glacial range, which have their own glacial history depending on latitude, terrain and climate. There is a general correspondence between glacials in different regions. Investigators often interchange the names if the glacial geology of a region is in the process of being defined. However, it is generally incorrect to apply the name of a glacial in one region to another. For most of the 20th century, only

2666-450: The historical terminology was established. Corresponding to the terms glacial and interglacial, the terms pluvial and interpluvial are in use (Latin: pluvia , rain). A pluvial is a warmer period of increased rainfall; an interpluvial is of decreased rainfall. Formerly a pluvial was thought to correspond to a glacial in regions not iced, and in some cases it does. Rainfall is cyclical also. Pluvials and interpluvials are widespread. There

2728-613: The large amounts of material moved about by glaciers. Less common are cave deposits, travertines and volcanic deposits (lavas, ashes). Pleistocene marine deposits are found primarily in shallow marine basins mostly (but with important exceptions) in areas within a few tens of kilometres of the modern shoreline. In a few geologically active areas such as the Southern California coast, Pleistocene marine deposits may be found at elevations of several hundred metres. The modern continents were essentially at their present positions during

2790-466: The lower Palaeolithic they disappeared, and the only hominin species found in fossilic records is Homo erectus for much of the Pleistocene. Acheulean lithics appear along with Homo erectus , some 1.8 million years ago, replacing the more primitive Oldowan industry used by A. garhi and by the earliest species of Homo . The Middle Paleolithic saw more varied speciation within Homo , including

2852-478: The megafauna and migrated north. Late Pleistocene bighorn sheep were more slender and had longer legs than their descendants today. Scientists believe that the change in predator fauna after the late Pleistocene extinctions resulted in a change of body shape as the species adapted for increased power rather than speed. The extinctions hardly affected Africa but were especially severe in North America where native horses and camels were wiped out. In July 2018,

2914-577: The older Pliocene Epoch , which Lyell had originally thought to be the youngest fossil rock layer. He constructed the name "Pleistocene" ('most new' or 'newest') from the Greek πλεῖστος ( pleīstos ) 'most' and καινός ( kainós ( Latinized as cænus ) 'new'). This contrasts with the immediately preceding Pliocene ("newer", from πλείων ( pleíōn , "more") and kainós ) and the immediately subsequent Holocene ("wholly new" or "entirely new", from ὅλος ( hólos , "whole") and kainós ) epoch , which extends to

2976-458: The present time. The Pleistocene has been dated from 2.580 million (±0.005) to 11,700 years BP with the end date expressed in radiocarbon years as 10,000 carbon-14 years BP. It covers most of the latest period of repeated glaciation , up to and including the Younger Dryas cold spell. The end of the Younger Dryas has been dated to about 9700 BCE (11,700 calendar years BP). The end of

3038-656: The quality of the field with the top teams unwilling to race three times in four days, however in 2004 the UCI agreed to a date change to a less intense week on the Friday after Paris–Roubaix and two days before the biggest one-day race in the Netherlands, the Amstel Gold Race . However the event was moved to yet another new date in 2006, with the race taking place in June, away from the congested spring classics calendar and no longer competing in

3100-556: The race looked like being cancelled as the Foot and Mouth outbreak hit the Netherlands but the race eventually went ahead as the organisers modified the route to avoid sensitive areas. The 2007 race brought on board the Dutch organisation Food Valley as main sponsors and the event had the alternative title of The Dutch Food Valley Classic . Until 2008, the race always started in Veenendaal, but in 2009

3162-602: The race started in Barneveld . From 2014 onwards, the race became known in Dutch as the Arnhem–Veenendaal Classic, reflecting a new start location in Arnhem . In 2018, a women's race was added to the programme. The race was classified as a 1.1 UCI race and won by Annemiek van Vleuten . However, in 2019 the women's race was removed from the programme again with the organisers citing a lack of availability of police support for

SECTION 50

#1733092530333

3224-537: The race. In 2022, the women's race was put back on the cycling calendar and is held on the day before the men's race. List of winners: Veluwe The Veluwe ( Dutch pronunciation: [ˈveːlyʋə] ) is a forest-rich ridge of hills (1100 km ; 420 sq. mi.) in the province of Gelderland in the Netherlands . The Veluwe features many different landscapes, including woodland , heath , some small lakes and Europe's largest sand drifts. The Veluwe

3286-417: The ratio of O to O (two isotopes of oxygen ) by mass (measured by a mass spectrometer ) present in the calcite of oceanic core samples is used as a diagnostic of ancient ocean temperature change and therefore of climate change. Cold oceans are richer in O , which is included in the tests of the microorganisms ( foraminifera ) contributing the calcite. A more recent version of

3348-564: The revised definition of the Quaternary , by pushing back the start date of the Pleistocene to 2.58 Ma, results in the inclusion of all the recent repeated glaciations within the Pleistocene. Radiocarbon dating is considered to be inaccurate beyond around 50,000 years ago. Marine isotope stages (MIS) derived from Oxygen isotopes are often used for giving approximate dates. Pleistocene non-marine sediments are found primarily in fluvial deposits , lakebeds, slope and loess deposits as well as in

3410-475: The same midweek with the Scheldeprijs . For the 2010 season, another date change is scheduled: the race will move to mid-August. In 2005 Veenendaal–Veenendaal benefited from the creation of the new UCI ProTour structure when it was elevated to 1.HC standard bringing to the same level as Belgium's Omloop "Het Volk" and Germany's Rund um den Henninger Turm , thus bringing more sponsorship and publicity. In 2001

3472-407: The sampling process makes use of modern glacial ice cores. Although less rich in O than seawater, the snow that fell on the glacier year by year nevertheless contained O and O in a ratio that depended on the mean annual temperature. Temperature and climate change are cyclical when plotted on a graph of temperature versus time. Temperature coordinates are given in the form of

3534-632: The sole factor responsible for the variations in climate since they explain neither the long-term cooling trend over the Plio-Pleistocene nor the millennial variations in the Greenland Ice Cores known as Dansgaard-Oeschger events and Heinrich events. Milankovitch pacing seems to best explain glaciation events with periodicity of 100,000, 40,000, and 20,000 years. Such a pattern seems to fit the information on climate change found in oxygen isotope cores. In oxygen isotope ratio analysis, variations in

3596-421: The study of cyclical climate changes. The glacials in the following tables show historical usages, are a simplification of a much more complex cycle of variation in climate and terrain, and are generally no longer used. These names have been abandoned in favour of numeric data because many of the correlations were found to be either inexact or incorrect and more than four major glacials have been recognised since

3658-428: The traditional linguistic boundary between Low Franconian dialects (i.e. essentially Dutch and closely related dialects) to the west and south and Low Saxon dialects further north and east. There are both coniferous and deciduous forests on the Veluwe, and some 500 different plant species can be found. The region is also home to many different species of animals, such as wild boar , several species of deer (like

3720-732: The two regions and changing ocean circulation patterns, with the onset of glaciation in the Northern Hemisphere occurring around 2.7 million years ago. During the Early Pleistocene (2.58–0.8 Ma), archaic humans of the genus Homo originated in Africa and spread throughout Afro-Eurasia . The end of the Early Pleistocene is marked by the Mid-Pleistocene Transition , with the cyclicity of glacial cycles changing from 41,000-year cycles to asymmetric 100,000-year cycles, making

3782-543: Was a series of glacials and interglacials, stadials and interstadials, mirroring periodic climate changes. The main factor at work in climate cycling is now believed to be Milankovitch cycles . These are periodic variations in regional and planetary solar radiation reaching the Earth caused by several repeating changes in the Earth's motion. The effects of Milankovitch cycles were enhanced by various positive feedbacks related to increases in atmospheric carbon dioxide concentrations and Earth's albedo. Milankovitch cycles cannot be

SECTION 60

#1733092530333

3844-511: Was used in opposition to the fertile "good lands" of the Betuwe (from * bataz , good, and * awjō , island) to the south. There are 21 municipalities in the Veluwe region: Apeldoorn , Arnhem , Barneveld , Brummen , Ede , Elburg , Epe , Ermelo , Harderwijk , Hattem , Heerde , Nijkerk , Nunspeet , Oldebroek , Putten , Renkum , Rheden , Rozendaal , Scherpenzeel , Voorst and Wageningen . The sparsely populated, infertile Veluwe acts as

#332667