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Glacial Period - LoveToKnow Watches   (Site not responding. Last check: 2007-11-01) In addition to the stratified deposits and their contents, important evidence in favour of interglacial epochs occurs in the presence of weathered surfaces on the top of older boulder clays, which are themselves covered by younger glacial deposits. The cause of the interglacial hypothesis has been most ardently championed in England by Professor James Geikie; who has endeavoured to show that there were in Europe six distinct glacial epochs within the Glacial period, separated by five epochs of more moderate temperature. Although it is admitted that no strict correlation of the European and North American stages is possible, it has been suggested that the Aftonian may be the equivalent of the Helvetian; the Kansan may represent the Saxonian; the Iowan, the Polandian; the Jerseyan, the Scanian; the early Wisconsin, the Mecklenburgian. www.1911encyclopedia.org /Glacial_Period   (3278 words)

Ice age - Biocrawler   (Site not responding. Last check: 2007-11-01) The colder periods are called 'glacial periods', the warmer periods 'interglacials', such as the Eemian interglacial era. The complex pattern of changes in Earth's orbit and the change of albedo may influence the occurrence of glacial and interglacial phases — this was first explained by the theory of Milutin Milankovic. In particular, during the last 800 thousand years the dominant inter/glacial oscillation has been 100 thousand years, which corresponds to changes in Earth's eccentricity and orbital inclination, and yet is by far the weakest of the three frequencies predicted by Milankovic. www.biocrawler.com /encyclopedia/Ice_age   (2161 words)

User:Fabartus/scratchpads/Glacial Vs Interglacial Epocs - Wikipedia, the free encyclopedia The last glacial and interglacial phases of the Pleistocene are named, from most recent to most distant, as follows (names before the '/' are North America, names after it Northern European, dates in thousand years BCE. It is now perhaps more common (before the previous interglacial, the Eemian) to refer to periods by their Marine isotopic stage number. The marine record preserves all the past glaciations; the land-based evidence is less complete because successive glaciations may wipe out evidence of their predecessors. en.wikipedia.org /wiki/User:Fabartus/scratchpads/Glacial_Vs_Interglacial_Epocs   (348 words)

[No title] Not only is it extensive in area, but the stratigraphic break is very great, as shown by (I) the excess of metamorphism of the lower group as compared with the upper, and (2) the amount of erosion suffered by the older group before the deposition of the younger. Four defined zones of interglacial deposits are detected, all of which are thought to represent great recessions of the ice, or perhaps its entire disappearance. The climate of some of the interglacial epochs was at least as warm as that of the present time in the same regions. encyclopedia.jrank.org /correction/edit?locale=en&content_id=52657   (10399 words)

Pleistocene - Wikipedia, the free encyclopedia   (Site not responding. Last check: 2007-11-01) The Pleistocene is the third epoch of the Neogene period or 6th epoch of the Cenozoic era. The mean annual temperature at the edge of the ice was −6°C; at the edge of the permafrost, 0°C. Each glacial advance tied up huge volumes of water in continental ice sheets 1500-3000 m thick, resulting in temporary sea level drops of 100 m or more over the entire surface of the Earth. During interglacial times, such as we are experiencing now, drowned coastlines were common, mitigated by isostatic or other emergent motion of some regions. www.io.com /~xiombarg/cgi-bin/nph-colorblind.cgi/000100A/http/en.wikipedia.org/wiki/Pleistocene   (1756 words)

Timeline of glaciation - Wikipedia, the free encyclopedia It has been suggested also that the end of this cold period was responsible for the subsequent Cambrian Explosion, a time of rapid diversification of multicelled life during the Cambrian era. It is now perhaps more common (before the previous interglacial to the current (Holocene) one, the Eemian) to refer to periods by their Marine isotopic stage number. The last glacial and interglacial phases of the Pleistocene are named, from most recent to most distant, as follows. en.wikipedia.org /wiki/Timeline_of_glaciation   (330 words)

HighBeam Encyclopedia - Pleistocene epoch   (Site not responding. Last check: 2007-11-01) Since the interglacial periods of the Pleistocene were of longer duration than the time elapsed since the end of the Pleistocene 11,000 years ago, it is sometimes suggested that the Holocene, or Recent, epoch, which is occurring now, may be merely another such interglacial stage and that the glaciers may return at some future time. The characteristic formation laid down in the glacial stages of the Pleistocene, as in all glacial periods, is the drift. The interglacial stages were marked by the weathering of the till of the drift to form a sticky, heavy soil called the gumbotil and by the deposition of peat and loess. www.encyclopedia.com /html/P/Pleistoc.asp   (1009 words)

Ice age The idea that, in the past, glaciers had been far more extensive was folk knowledge in some alpine regions of Europe (Imbrie and Imbrie, p25, quote a woodcutter telling de Charpentier of the former extent of the Swiss Grimsel glacier). The cause of ice ages remain controversial, but the general consensus is that it is a combination of up to three different factors: atmospheric composition (particularly the fraction of CO The complex pattern of changes in Earths orbit and the change of albedo may influence the occurrence of glacial and interglacial phases - this was first explained by the theory of Milutin Milankovic. encyclopedia.codeboy.net /wikipedia/i/ic/ice_age_1.html   (1380 words)

KGS--Pleistocene Geology of Kansas--Classification and Correlation In application to the interglacial intervals the term Age is quite appropriate; however, the application of Stage is not so clear because the physical record of much of this time is preserved in soil profiles that represent the alteration of earlier rocks. The change involved the elimination of the Peorian as an interglacial stage and the inclusion of the Iowan stage as the oldest substage of the Wisconsin. The Recent Age (Stage), predominantly comparable in character to an interglacial interval, is the last major subdivision of the Pleistocene and includes the time since the Mankatoan glaciers ceased to exert a recognizable influence in the central interior region of North America. www.kgs.ku.edu /Publications/Bulletins/99/04_prin.html   (7632 words)

New Page 1 The peoples of India lay stagnant, with a civilization that was unprogressing; the yellow man was consolidating his holdings in central Asia; the brown man had not yet begun his civilization on the near-by islands of the Pacific. During the previous hunting era the superior tribes had intermarried with the higher types of war captives and had unvaryingly destroyed those whom they deemed inferior. Man ordinarily evolved into a farmer from a hunter by transition through the era of the herder, and this was also true among the Andites, but more often the evolutionary coercion of climatic necessity would cause whole tribes to pass directly from hunters to successful farmers. www.world-destiny.org /geoforce.htm   (5837 words)

Cromerian interglacial - Unipedia It is a Pleistocene stage of the Quaternary period and is analogous to the Aftonian interglacial in North America and the Günz-Mindel interglacial in the Alps. Cromerian interglacial deposits at Sugworth, near Oxford, England, and their relation to the plateau drift of the Cotswolds and the terrace sequence of... Books : Cromerian interglacial deposits at Sugworth, near Oxford, England, and their relation to the plateau drift of the Cotswolds and the terrace sequence of... www.unipedia.info /Aftonian_interglacial_era.html   (262 words)

Only one Ice Age   (Site not responding. Last check: 2007-11-01) An interglacial is the period between ice ages when all of the glaciers melted, except for Antarctica and Greenland. This mainly consists of presumed interglacial deposits between layers of till and the old appearance of some glacial debris, especially in the north-central United States. In conclusion, the idea that these clay layers represent interglacial times between ice ages is a stretch. www.answersingenesis.org /home/area/fit/chapter11.asp   (4632 words)

Geologic Time Scale Thus, the Paleozoic Era refers to ‘‘ancient life,’’ the Mesozoic Era to ‘‘medieval life’’ and the Cenozoic Era to ‘‘modern life.’’ Rocks older than Paleozoic generally lack diagnostic fossils and are widely known as belonging to the Precambrian Era. This era included about 80 percent of Earth's history, that is, from nearly 5 billion years to 800 million or 700 million years ago. Of particular significance is the investigation of the stratigraphic records of sea floors that has led to new views on the length and frequency of glacial and interglacial episodes. southwest.library.arizona.edu /azso/back.1_div.1.html   (1090 words)

KGS--Sedgwick County Geohydrology--Geology 2 Events associated with the Nebraskan Glaciation and the Aftonian Interglaciation in Sedgwick County are not well defined, and most of the sediments deposited at this time have been removed by later erosion or are buried under younger sediments. Scattered remnants of a high-level terrace of presumed Nebraskan and or Aftonian age along the Smoky Hill Valley in western and central Kansas (Frye, Leonard, and Hibbard, 1943) strongly suggest the presence of a major stream in that area. Events associated with the second continental glaciation (the Kansan) and the Yarmouthian Interglacial Stage that followed, are much better known in most of the State, owing to better preservation of the sediments deposited during this time, than are the events of the first continental glaciation (,the Nebraskan) and the Aftonian Interglacial Stage. www.kgs.ku.edu /General/Geology/Sedgwick/geol02.html   (2501 words)

Pleistocene Encyclopedia Articles @ 216.92.11.26 ()   (Site not responding. Last check: 2007-11-01) The mean annual temperature at the edge of the ice was −6°C; at the edge of the permafrost, 0°C. During interglacial times, such as we are experiencing now, drowned coastlines were common, mitigated by isostatic or other emergent motion of some regions. Due to the decrease in oceanic and other evaporation, rainfall was lower. These are periodic variations in regional solar radiation caused by the sum of a number of repeating changes in the Earth's motion. 216.92.11.26 /encyclopedia/Pleistocene   (1302 words)

Eustatics: Sea Level Changes We constructed the A, B1, B2 and C interglacial episodes and the Pleistocene Preglacial of Table 1 from Haq. The concept of interglacial island isolation is not a new one among biologists. So, although few are aware of it, the facts are that the 'split' occurred when it did and each of the species emerged when it did, and the glacial cycles occurred as they did, but only a single hypothesis logically and coherently explains the relationships. interglacial.org /printit/aiih3.htm   (2796 words)

Pleistocene   (Site not responding. Last check: 2007-11-01) The end of the Pleistocene corresponds with the end of the Paleolithic age used in Archaeology. The interglacials corresponding to these glacials are listed in the table below. Corresponding to the terms glacial and interglacial, the terms pluvial and interpluvial are in use. pda.molinu.com /wiki/en/pl/Pleistocene.htm   (1631 words)

[No title] The rock record for the Paleozoic Era (between 570 and 230 million years ago) is dominated by limestone formations formed from calcareous sediments deposited in shallow seas. Through the Triassic and Jurassic Periods of the Mesozoic Era additional sediments were episodically deposited across the Badlands region. The correlation between climatic conditions between glaciation and interglaciations period to surficial processes is a complex, unending debate. geopubs.wr.usgs.gov /open-file/of03-35/Badlands.txt   (16687 words)

History of the State Geological Survey of Iowa This intercontinental correlation of geologic deposits was a significant departure from the geological thinking of the day and represented one of the earliest applications of principles which form the basis of modern geology. This exploratory era was followed by settlement and by more purposeful geological reconnaissance and mapping. The complexity of these glacial periods, including the existence of warm, interglacial episodes as interpreted from the "Aftonian" gravels of western Iowa and their classic fauna of Pleistocene mammals, was unraveled by such men as McGee, Chamberlin, Salisbury, Calvin, and Leverett. www.igsb.uiowa.edu /about/history/history.htm   (4892 words)

1000 Islands Ecology - Geology of the Thousand Islands The Nebraskan was followed by the warmer Aftonian Interglacial, and then by the Kansan Glacial State. The retreat of Kansan ice sheets led to the Yarmouthian Interglacial Stage which was followed by the advance of Illinoian age glaciers, into Ohio, Kentucky, Indiana and Illinois. In a few places, the material formed by earlier glacial and interglacial process was not completely removed from Canada by the scouring action of Wisconsin ice. oliver_kilian.tripod.com /1000islands/IsIn2-Rocks/rocks.htm   (12521 words)

G Each time Era (except the first) is divided into Periods (e.g., the Cenozoic into the Quaternary and the Tertiary) and Periods are further divided into Epochs (e.g., the Tertiary into the Pliocene, Miocene, Oligocene, Eocene, and the Paleocene). Rock formations constituting a specific (time) Era form a Group of rocks; those rocks having been formed during a specific (time) Period constitute a rock System; and those rock formations originating during a specific (time) Epoch are said to belong to a particular Series of rocks. Those recognized for the interior of North America are, in order of age: Jerseyan or Nebraskan (glacial); Aftonian (interglacial); Kansan (glacial); Yarmouth and Buchanan (interglacial); Illinoian (glacial); Sangamon (interglacial); Iowan (glacial); Peorian (interglacial); Earlier Wisconsin (glacial); an unnamed (interglacial) interval; Later Wisconsin (glacial); Champlain (glaciolacustrine epoch). www.fxbrowne.com /html/g.htm   (7315 words)

How Good are those Young-Earth Arguments: Hovind's 'Proofs' (continued) Technically, we are living in an interglaciation period of the present Ice Age. Plots of the collected data for the entire time span from Recent back through the Paleozoic Era showed a nonuniform increase in days per month going back in time, and from this it is inferred that tidal friction has not been uniform in that period. The warm period of 80,000-120,000 years is centered on the Last Interglacial (Ipswichian) interlude; the warm period of 170,000-200,000 years ago takes in the Penultimate Interglaciation (Hoxnian) interlude. www.talkorigins.org /faqs/hovind/howgood-yea2.html   (11119 words)

Time There are many hypotheses, yet none explain the seemingly regular patterns except for the Milankovitch cycles. It is thought that the Milankovitch cycles serve as triggers which start the stages of glacial and interglacial periods. Glacial and interglacial stages are now commonly referred to by their isotopic stage. www.homepage.montana.edu /~geol445/hyperglac/time2   (1100 words)

Ice age Sediment records showing the fluctuating sequences of glacials and interglacials during the last several Myr The present ice age began 40 million years ago with the growth of an ice sheet in Antarctica, but intensified during the Pleistocene (starting around 3 million years ago) with the spread of ice sheets in the Northern Hemisphere. Shows the pattern of temperature and ice volume changes associated with recent glacials and interglacials In between ice ages, there are multi-million year periods of more temperate climate, but also within the ice ages (or at least within the last one), temperate and severe periods occur. ] The last glacial and interglacial phases of the Pleistocene are named, from most recent to most distant, as follows (names before the / are North America, names after it Northern European, dates in thousand years BCE. ice-age.ask.dyndns.dk   (2043 words)

Glaciers   The evidence for glacial and interglacial stages can be found in till deposits and in soils formed during interglacial stages. In North America, there were at least four major glaciations separated by warm interglacial periods during the Great Ice Age beginning 1.6 m.y.a. These advances include the Nebraskan, the Kansan, the Illinoian, and the Wisconsinan glacial cycles and the Aftonian, Yarmouth, the Sangamon and the present interglacial. jove.geol.niu.edu /faculty/fischer/429_info/429trips/NIF/Glaciers.htm   (3107 words)

The Pleistocene Epoch of the Quaternary Period of the Cenozoic Era The Pleistocene Epoch of the Quaternary Period of the Cenozoic Era The Pleistocene epoch is the best-known glacial period, commonly referred to as the Ice Age, of Earth’s history. In South America, Patagonia and the southern Andes lay under an extension of the antarctic sheet, while in Asia and the Caucasus, the Himalayas, and other mountain regions were glaciated. www.science501.com /PTPleistocene.html   (814 words)

Quaternary Geologic History of Minnesota - Outline of Topic one of the tills was deeply weathered by chemical processes during interglacial time to form a thick ancient soil where even the most resistant rock fragments have turned to clay. This is an exciting area of continuing study, all facilitated by careful mapping of glacial deposits and their landforms. For example, if climate changes from a glacial period to an interglacial period, discharge of river systems draining the ice will increase because of large volumes of meltwater available to the streams. www.winona.edu /geology/mrw/Quaternary.htm   (4996 words)

THE CAPE SABLE SEASIDE SPARROW: ITS FORMER AND PRESENT DISTRIBUTION Certainly there were no sparrows anywhere in Florida during the first (Aftonian), or second (Yarmouth) interglacial stages, when according to Cooke (1939) the sea level stood at plus 270 feet and plus 215 feet, respectively. It may have been possible for Seaside Sparrows, if any were then in existence, to have gained a footing on Floridian shores during sub- sequent glacial stages of the Pleistocene Epoch. During the last part of the Wisconsin glacial era when the sea level dropped to minus 25 feet or more, it might have been possible (and probably was) for the ancestral sparrow to populate the west shoreline of Florida then lying several miles out in what is now the Gulf of Mexico. elibrary.unm.edu /sora/Auk/v073n04/p0489-p0502.html   (10153 words)

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