| 单词 | glacial period |
| 例句 | The other, at 12 feet by 20 feet, shows animals and plants of central Alaska during the last glacial period. The beloved murals at Natural History Museum are coming back 2018-06-22T04:00:00Z We call these periods ice ages or glacial periods. Europe was not covered by dense forest before the arrival of modern humans 2023-11-14T05:00:00Z It’s that high because past research was based on wrong calculations of how fast the world warmed between glacial periods, Hansen said. Pioneering scientist says global warming is accelerating. Some experts call his claims overheated 2023-11-02T04:00:00Z "This is what we think happened during the last glacial period. But we don't know how strongly -- or how fast -- these currents will respond to ocean warming." Large swings in past ocean oxygen revealed 2023-10-12T04:00:00Z Extended cold glacial periods when the ice expanded quickly gave way to warm interglacial periods when the ice melted and sea level rose, flooding coastal areas around the world. When Greenland was green: Ancient soil from beneath a mile of ice offers warnings for the future 2023-07-23T04:00:00Z The most recent cold cycle caused the last major glacial period, which ended about 10,000 years ago. Miller & Levine Biology 2018-01-01T00:00:00Z The earliest glacial period was about 2 billion years ago and lasted for around 300 million years. Europe was not covered by dense forest before the arrival of modern humans 2023-11-14T05:00:00Z The current glacial period is known as the Pleistocene Glaciation, and while it was much more intense 20,000 years ago than it is now, we are still in the middle of it. Physical Geology 2015-01-01T00:00:00Z Scientists know that around 200,000 years ago Earth was experiencing a glacial period and our ancestors were migrating out of Africa. Why Was This Ancient Tusk 150 Miles From Land, 10,000 Feet Deep? 2021-11-22T05:00:00Z But today’s melting and large-scale sediment flushing is happening much faster than what would occur at the end of a glacial period, she adds. Muddier Rivers Are Jeopardizing Dams and Water Quality for Millions 2021-10-28T04:00:00Z But about 110,000 years ago, temperatures in Europe dipped suddenly as a new glacial period set in. DNA from cave dirt tells tale of how some Neanderthals disappeared 2021-04-15T04:00:00Z Although it may seem confusing, we are actually in such a major glacial period right now. Europe was not covered by dense forest before the arrival of modern humans 2023-11-14T05:00:00Z Their results show that a dip in CO2 concentrations coincided with the temperature drop associated with the glacial period around 20,000 years ago. Forty years of ice-core records of CO2 2020-03-22T04:00:00Z This provides the strongest confirmation yet of the large-scale accumulation of carbon in the deep ocean during glacial periods owing to a stronger biological pump. 30 years of the iron hypothesis of ice ages 2020-02-16T05:00:00Z When the planet transitioned to 100,000-year ice ages, for example, levels of CO2 dropped on average 24 ppm lower during glacial periods compared with similar events in the previous era. World’s oldest ice core could solve mystery of ‘flipped’ ice age cycles 2019-10-30T04:00:00Z Formed during the late Pleistocene, the Earth’s last glacial period, which ended about 11,700 years ago, Yedoma consists of thick layers of soil packed around gigantic lodes of embedded ice. In fast-thawing Siberia, radical climate change is warping the Earth beneath the feet of millions 2019-10-04T04:00:00Z The current glacial period has lasted for almost 2.6 million years, but we are currently in an interglacial period, now being exacerbated and likely prolonged by human greenhouse gas emissions. Europe was not covered by dense forest before the arrival of modern humans 2023-11-14T05:00:00Z During glacial periods, the currents tend to be vigorous, leading to thin layers of fine sediments. Newly drilled sediment cores could reveal how fast the Antarctic ice sheet will melt 2019-04-15T04:00:00Z Around the time of publication, evidence for high dust delivery during glacial periods had just emerged from studies of deep Antarctic ice cores4. 30 years of the iron hypothesis of ice ages 2020-02-16T05:00:00Z An Indonesia-style collision may push the global climate into a glacial period, but only for a while. Rise of carbon dioxide–absorbing mountains in tropics may set thermostat for global climate 2018-12-28T05:00:00Z And these cycling glacial periods have been recurring for 10's of thousands of years. In Cave in Israel, Scientists Find Jawbone Fossil From Oldest Modern Human Out of Africa 2018-01-25T05:00:00Z Arbogast suspects that these Pacific coast gliders endured a different experience during the glacial period, perhaps becoming isolated in the southern regions of the Pacific coast. Meet This Newly Discovered Flying Squirrel The last glacial period there was 12,000 years ago, while across a sea of water and time, the earliest Israelites were settling Israel, thousands of years before they built the Wall of Jericho. Ashley Jewish cemetery gets rededication 2017-05-13T04:00:00Z Humans and climate change were long the prime suspects in the disappearance of South America’s large mammals, which took place after the last glacial period, about 15,000 years ago. Climate change—not humans—killed giant camels and sloths in South America 2016-08-03T04:00:00Z Now, researchers have extended that theory, finding that such tropical mountain-building collisions coincide with nearly all of the half-dozen or so significant glacial periods in the past 500 million years. Rise of carbon dioxide–absorbing mountains in tropics may set thermostat for global climate 2018-12-28T05:00:00Z The last glacial period isolated the fish in the two locations, according to Montana Fish, Wildlife and Parks. A roundup of recent Michigan newspaper editorials 2016-07-04T04:00:00Z A 2014 study of the AMOC, based on a core from a nearby spot on the Bermuda Rise, found that the currents maintained much of their strength throughout the last glacial period. Crippled Atlantic currents triggered ice age climate change 2016-06-30T04:00:00Z But there were big differences between hemispheres in this and other glacial periods. Was There an Ice Age in the Southern Hemisphere? 2016-06-06T04:00:00Z Signs of early inhabitants are also starting to appear along the coast, particularly in spots where the swelling seas have not covered ancient shorelines since the end of the last glacial period. Fishing for the first Americans 2015-09-07T04:00:00Z Previously, the human “overkill” hypothesis gained a lot of ground based on the fact there were not many identified extinction events during glacial periods. Ice Age Megafauna Extinction Coincide With Mysterious Climate Cycles 2015-07-27T04:00:00Z Most scientists agree the Americas were peopled by forefathers who crossed the Bering land and ice bridge which connected modern-day Russia and Alaska in Earth’s last glacial period. One wave of migration from Siberia populated the Americas, DNA shows 2015-07-21T04:00:00Z By looking at historical records of sea level rise following the last glacial period, about 20,000 years ago, they were able to match the stories to coinciding dates. Aboriginal legends reveal ancient secrets to science - BBC News 2015-05-18T04:00:00Z The area, which was declared an American national monument in 1925, affords scientist numerals possibilities o study the glacial periods. Jaeger-LeCoultre, UNESCO Unveil Glacier Bay National Park Video, Photo Exhibit to Honor Ecosystem 2015-04-22T04:00:00Z Dale Guthrie, a Quaternary Period paleontologist who retired from the University of Alaska Fairbanks, said the last glacial period in Alaska was about 18,000 years ago. Mom, son find wooly mammoth tusks 22 years apart 2014-08-14T04:00:00Z It was a commonly thought extinctions would be occurring during the cooling parts of climate cycles during the last glacial period. Ice Age Megafauna Extinction Coincide With Mysterious Climate Cycles 2015-07-27T04:00:00Z Since the Neanderthal population was around during the last glacial period, the species was better acclimatized to a cold-weather climate than that of modern humans. What Cavemen Can Teach You About Leadership 2014-07-31T04:00:00Z The two crows could have diverged from a common ancestor after glacial periods pushed them into isolated southern enclaves, such as Italy and the Iberian Peninsula, Wolf says. Two crows kept separate by their looks 2014-06-19T04:00:00Z Third, we are in a major glacial period, and have been for the last 10 million years. Who Cares About Global Warming? 2013-07-28T18:54:00Z The pronounced elongation of the Magicicada life span may trace to about 20,000 years ago, during the last glacial period. Deciphering the Strange Mathematics of Cicadas [Video] 2013-05-23T14:15:09.293Z The bay is a product of what is known as the Little Ice Age, a glacial period that came and went quickly -- between the 16th and 19th centuries -- as far as geologic time goes. Green Blog: Along a Verdant Shore, a Vision of Past, Present and Future 2012-07-11T13:15:59Z The author seeks to explain it by the glacial periods and variations of climate. Mysterious Psychic Forces An Account of the Author's Investigations in Psychical Research, Together with Those of Other European Savants 2012-03-28T02:00:29.747Z The district affords frequent evidence of ice activity in the glacial period. Encyclopaedia Britannica, 11th Edition, Volume 13, Slice 7 "Horticulture" to "Hudson Bay" 2012-03-04T03:00:13.390Z The soundness of Croll’s astronomical theory regarding the glacial period has since been criticized by E. P. Culverwell in the Geological Magazine for 1895, and by others; and it is now generally abandoned. Encyclopaedia Britannica, 11th Edition, Volume 7, Slice 7 "Crocoite" to "Cuba" 2012-01-22T03:00:24.397Z Extent of Glacial Deposits.—From evidence of the kind cited above, it appears that during the glacial period a series of great ice-sheets covered enormous areas in North America and north-west Europe. Encyclopaedia Britannica, 11th Edition, Volume 12, Slice 1 "Gichtel, Johann" to "Glory" 2012-01-11T03:00:20.463Z The two species probably were separated in a glacial period as seems to have been the case with the wandering shrews. Speciation of the Wandering Shrew 2011-12-22T03:00:30.143Z Map showing the relation of the ice lobes during the Wisconsin epoch of the glacial period 92 37. The Geography of the Region about Devils Lake and the Dalles of the Wisconsin 2011-11-29T03:00:17.347Z Going back to the Proterozoic, it is astonishing to find that evidence of two highly developed glacial periods, and possibly four, has been discovered. Climatic Changes Their Nature and Causes 2011-10-28T02:00:24.840Z Consequently, we are not as yet entitled to assume that climatic characters—i. e. characters acquired by converse with a new environment, continued, say, since the last glacial period—can never have become congenital characters. Darwin, and After Darwin, Volume 2 Post-Darwinian Questions: Heredity and Utility 2011-10-16T02:00:14.153Z The glacial period transformed the climate of the world and destroyed these luxuriant northern forests under a grinding continuous glacier. Trees Worth Knowing 2011-10-13T02:00:48.357Z The Earth needed, for example, 5,000 years to bring atmospheric CO2 concentrations up 80 ppm after the last glacial period. Why Carbon Dioxide Is a Greenhouse Gas 2011-08-16T19:45:06.200Z The history of these several narrows, up to the time of the glacial period may now be summarized. The Geography of the Region about Devils Lake and the Dalles of the Wisconsin 2011-11-29T03:00:17.347Z During the last or Pleistocene glacial period the evidence in America and Europe indicates that the inter-glacial epochs varied in length and that the later ones were shorter than the earlier. Climatic Changes Their Nature and Causes 2011-10-28T02:00:24.840Z The existing land features, with the fjords, are due to ice erosion in the glacial period.1 The climate is oceanic; fogs are common, violent storms are frequent at all seasons. Encyclopaedia Britannica, 11th Edition, Volume 10, Slice 1 "Evangelical Church Conference" to "Fairbairn, Sir William" 2011-07-16T02:00:16.387Z Ferreras told me that the lynx evolved on the Iberian Peninsula during the Pleistocene epoch glacial periods at the same time as the European rabbit. Deadly Rabbit Disease May Have Doomed Iberian Lynx 2011-07-12T11:45:01.997Z What one might call re-entering the glacial period, eh?” Dorrien of Cranston 2011-07-07T02:00:31.540Z In the case of the ice sheets of the glacial period, each of these stages was probably more or less complex. The Geography of the Region about Devils Lake and the Dalles of the Wisconsin 2011-11-29T03:00:17.347Z According to our stellar hypothesis, occasional groups of glacial epochs would be expected to occur close together and to form long glacial periods. Climatic Changes Their Nature and Causes 2011-10-28T02:00:24.840Z It began to look as though the glacial period had returned to the wurld. The Comstock Club 2011-05-18T02:00:16.367Z Errat�ics, or Erratic Blocks, in geology, boulders or large masses of angular rock which have been transported to a distance from their original positions by the action of ice during a glacial period. The New Gresham Encyclopedia Volume 4, Part 2: Ebert to Estremadura 2011-04-14T02:00:56.200Z In time this gulf is as wide as from the present to several millions of years previous to the glacial period. Studies in the Out-Lying Fields of Psychic Science 2011-04-14T02:00:40.453Z This was true of the streams of the glacial period. The Geography of the Region about Devils Lake and the Dalles of the Wisconsin 2011-11-29T03:00:17.347Z The presence of extensive lakes and other evidences of a pluvial climate during glacial periods in non-glaciated regions which are normally dry is another of the facts which most glacial hypotheses fail to explain satisfactorily. Climatic Changes Their Nature and Causes 2011-10-28T02:00:24.840Z Its no quiet, respectable snow such as you see in civilized countries, but it just piles down as though a new glacial period had descinded upon the worreld. The Comstock Club 2011-05-18T02:00:16.367Z The mountains to the south are young, having been elevated very much since the climax of the glacial period. All about the Klondyke gold mines 2011-04-13T02:00:12.887Z These fractures are analogous to those of human action observed on bones from the glacial period, and identical with those made by northern tribes of the present day, on the skulls of ruminants. A Manual of the Antiquity of Man 2011-02-21T03:00:07.080Z The interruption of this cycle was caused by the advent of the glacial period which disturbed the normal course of erosion. The Geography of the Region about Devils Lake and the Dalles of the Wisconsin 2011-11-29T03:00:17.347Z For instance, the earth's mean temperature during the glacial period has been assumed as 10°C. lower than now, but the difference may have been only 6°. Climatic Changes Their Nature and Causes 2011-10-28T02:00:24.840Z What is the growing opinion with regard to the climatic conditions during the glacial period of Pleistocene times? Geology 2011-02-20T03:00:12.660Z By the end of the glacial period, water levels in the Red Sea would have been more than 100 meters lower than they are currently. Middle Eastern Stone Age Tools Mark Earlier Date for Human Migration out of Africa 2011-01-27T22:45:08.147Z The Geographical Society and the Academy of Sciences wished the prisoner to finish a volume on the glacial period, and using this as a support, Sasha petitioned the authorities to allow his brother resume work. Comrade Kropotkin 2010-12-26T03:00:20.093Z Both the upper and lower Baraboo lakes, as well as the Wisconsin, had probably been reduced to small proportions, if not been completely drained, before the glacial period was at an end. The Geography of the Region about Devils Lake and the Dalles of the Wisconsin 2011-11-29T03:00:17.347Z The glacial period is not a thing of the distant past. Climatic Changes Their Nature and Causes 2011-10-28T02:00:24.840Z Boulders of plutonic rocks from this area have been widely distributed by the ice during the glacial period. Encyclopaedia Britannica, 11th Edition, Volume 8, Slice 8 "Dubner" to "Dyeing" 2010-12-26T03:00:17.840Z And although small watercraft certainly helped, it was a trick of climatic shifts—a window of plentiful rains on the heels of a glacial period—that made the trip possible. Middle Eastern Stone Age Tools Mark Earlier Date for Human Migration out of Africa 2011-01-27T22:45:08.147Z Many geologists believe that subsequently to the glacial period there was a great sea in Western Asia, of which the Caspian and Aral Seas are the remains. The New Gresham Encyclopedia. Vol. 1 Part 2 Amiel to Atrauli While one hemisphere is in a glacial period, the other will be enjoying a specially mild,—a "genial" period. The Geological Story of the Isle of Wight Another objection is that there is no known nebulosity near at hand with which to connect the climatic vicissitudes of the last glacial period. Climatic Changes Their Nature and Causes 2011-10-28T02:00:24.840Z Next day they came to a canyon that filled the Geological Survey man with profound enthusiasm, for, he said, it illustrated both the last glacial period and the last period of volcanic mountain building. Unexplored! But what was the glacial period compared with this new crisis of the globe and the sky? Underground Man There is no doubt in regard to the facts concerning a glacial period that must have existed in the ages past. Nature's Miracles, Volume 1 Familiar Talks on Science—World-Building and Life. Earth, Air and Water. Both these peoples inhabited southern England and the continent before and after the glacial period. Encyclopaedia Britannica, 11th Edition, Volume 5, Slice 5 "Cat" to "Celt" Oldest known glacial period near base of Proterozoic in Canada. Climatic Changes Their Nature and Causes 2011-10-28T02:00:24.840Z “Yes, and the deposits from the glacial period before that are older still,—a souvenir from the age of reptile dominance.” Unexplored! The glacial periods—for we know there have been several—now explained themselves by their reappearance on a large scale. Underground Man Those whose homes are situated between Winnetka and Waukegan on the lake shore have the foundations of their houses set in glacial drift that was shoved into position by the ice during the glacial period. Nature's Miracles, Volume 1 Familiar Talks on Science—World-Building and Life. Earth, Air and Water. Farther, it accords with the known fact that very great changes of level have occurred in connection with the glacial period. The Origin of the World According to Revelation and Science These in turn seem to merge into and be imposed on the greater waves which form glacial stages, glacial epochs, and glacial periods. Climatic Changes Their Nature and Causes 2011-10-28T02:00:24.840Z All these lakes, and the other mountain lakes before referred to, show by the terraces about them that the water stood during the glacial period much higher than it does now. Encyclopaedia Britannica, 11th Edition, Volume 5, Slice 1 "Calhoun" to "Camoens" The sun had certainly revived after the glacial periods; why should it not do so again? asked the optimists. Underground Man The facts of a glacial period are beyond question, but when it occurred, and how it occurred are questions that many have tried to answer. Nature's Miracles, Volume 1 Familiar Talks on Science—World-Building and Life. Earth, Air and Water. Farther, there is the best reason to believe that in the glacial period many old valleys were filled with clay, and that the modern cutting consisted merely in the removal of this clay. The Origin of the World According to Revelation and Science Hence so far as precipitation alone is concerned, we should actually expect that the snow line near the equator would rise a little during glacial periods. Climatic Changes Their Nature and Causes 2011-10-28T02:00:24.840Z I am afraid she still belongs to the glacial period. Molly Brown's Sophomore Days As the glacial period gradually advanced, the tropical plants will have retreated from both sides towards the equator followed in the rear by the temperate productions and these by the arctic. The Fundamental Principles of Old and New World Civilizations During the time of the glacial period there is evidence that there was more than one center of snow and ice accumulation and each of these great centers probably had several subcenters. Nature's Miracles, Volume 1 Familiar Talks on Science—World-Building and Life. Earth, Air and Water. If this is the case, subsidences of the land are natural concomitants of a glacial period, and will powerfully aid in removing all evidence of its occurrence. Island Life Or the Phenomena and Causes of Insular Faunas and Floras Yet such changes appear to have occurred during and since the glacial period. Climatic Changes Their Nature and Causes 2011-10-28T02:00:24.840Z In short, the ice of the great glacial period in America moved over the continent as one continuous sheet, overriding nearly all the inequalities of the surface. The Atlantic Monthly, Volume 14, No. 81, July, 1864 These strata are about the age of the Norwich crag; and the oldest eruptions of Etna must have taken place during the glacial period, but before the period of greatest cold in Northern Europe. Etna A History of the Mountain and of its Eruptions Bowlders of enormous size have been carried for hundreds of miles, and the experienced geologist is able to examine any one of them and tell us where its home was before the glacial period. Nature's Miracles, Volume 1 Familiar Talks on Science—World-Building and Life. Earth, Air and Water. We know that just before and during the glacial period we possessed a fauna almost or quite identical with that of adjacent parts of the continent and equally rich in species. Island Life Or the Phenomena and Causes of Insular Faunas and Floras During the glacial period some of the hurricanes probably swept far over the lands. Climatic Changes Their Nature and Causes 2011-10-28T02:00:24.840Z Greenland and the Arctic regions hold all that remains of the glacial period in North America. The Atlantic Monthly, Volume 14, No. 81, July, 1864 Evidence of considerable climatic changes since the last glacial period is not lacking. Encyclopaedia Britannica, 11th Edition, Volume 6, Slice 5 "Clervaux" to "Cockade" The first theory named is that the glacial period is due to the decrease of the original heat in our climate. Nature's Miracles, Volume 1 Familiar Talks on Science—World-Building and Life. Earth, Air and Water. This complexity of the causes at work may explain the somewhat contradictory evidence as to rise and fall of land, some authors maintaining that it stood higher, and others lower, during the glacial period. Island Life Or the Phenomena and Causes of Insular Faunas and Floras At other times, the ocean has been less extensive than now, as for example during the recent glacial period, and probably during several of the glacial periods of earlier date. Climatic Changes Their Nature and Causes 2011-10-28T02:00:24.840Z A warm oceanic current, like the Gulf Stream of the Atlantic, would shorten a glacial period. The Story of Extinct Civilizations of the West Then followed the reaction period of extreme cold, snow and ice—the glacial period. Solaris Farm A Story of the Twentieth Century This process has been hinted at in a former chapter, but we give it here as one of the kinds of lakes formed during the glacial period. Nature's Miracles, Volume 1 Familiar Talks on Science—World-Building and Life. Earth, Air and Water. They have therefore been generally considered to be snow or ice-caps, and to prove that Mars is now undergoing something like a glacial period. Island Life Or the Phenomena and Causes of Insular Faunas and Floras The bearing of all this on the glacial period may be judged by looking again at Fig. Climatic Changes Their Nature and Causes 2011-10-28T02:00:24.840Z His first impulse was to cross a contiguous, half-reclaimed tract, sprinkled with vast boulders of the glacial period, and reach the turnpike road that led around the mountain. The Advocate That ought not to require more than three or four glacial periods. The So-called Human Race Another effect of the glacial period has been the creation of numerous waterfalls throughout the glaciated area. Nature's Miracles, Volume 1 Familiar Talks on Science—World-Building and Life. Earth, Air and Water. The fact of the hippopotamus having lived at 54� N. Lat. in England immediately after the glacial period seems quite inconsistent with a mere gradual amelioration of climate from that time till the present day. Island Life Or the Phenomena and Causes of Insular Faunas and Floras In the first place this would require a lowering of many degrees,—far more than in the Pleistocene glacial period. Climatic Changes Their Nature and Causes 2011-10-28T02:00:24.840Z In the glacial period these stones were brought down by the ice and stranded on Jutland," said the Pastor; "they are scattered over the whole country more or less. A Danish Parsonage It would have been possible for these people to have come during the third glacial period, at the close of the Old Stone Age, or soon after in the Neolithic period. History of Human Society A vast amount of interest centers about this river because it is the best evidence we have of the time that has expired since the glacial period. Nature's Miracles, Volume 1 Familiar Talks on Science—World-Building and Life. Earth, Air and Water. In Switzerland two glacial periods are distinctly recognised, between which was a warm period when vegetation was so luxuriant as to form beds of lignite sufficiently thick to be worked for coal. Island Life Or the Phenomena and Causes of Insular Faunas and Floras The distribution of the ice in the last glacial period is well known, and is shown in Fig. Climatic Changes Their Nature and Causes 2011-10-28T02:00:24.840Z This tends to strengthen the opinion I had formed of there having been a glacial period in the earlier history of this part of the world also. Farthest North Being the Record of a Voyage of Exploration of the Ship 'Fram' 1893-1896 Vol. I The table on page 64 will contribute to the clearness of this brief statement about the glacial periods. History of Human Society The glacial periods prove that we cannot appeal to geology in aid of the doctrine that a secular cooling of the sun is now in progress. The Story of the Heavens And this must have taken place before the glacial period, because the glacial boulder clay lies upon the Kimeridge clay, which normally underlies the chalk. Records of Woodhall Spa and Neighbourhood Historical, Anecdotal, Physiographical, and Archaeological, with Other Matter Since the temperature in the glacial period was lower than now, we seem forced to attribute the increased precipitation to a strengthening of the winds. Climatic Changes Their Nature and Causes 2011-10-28T02:00:24.840Z It appears that the curious musk ox, which now lives on the fringe of the Arctic circle, and in the glacial period existed in the Thames Valley, is doomed. More Science From an Easy Chair These catastrophes Earthquake of Zante were made the object of special study in Germany and Switzerland, where Agassiz was in the midst of his epoch-making discourses on the glacial period. A History of the Nineteenth Century, Year by Year Volume Two (of Three) Was this the sacrificial stone of an ancient Druid; or are these boulders relics of the glacial period, and were the marks alluded to caused by the action of the weather? Chronicles of Strathearn Then, following the prehistoric and glacial period, more recent fauna—buffalo, elk, deer, bear, and wolf—made paths through the forest from salt lick to refreshing spring. Blue Ridge Country Our whole hypothesis is based on the supposition that what now happens at times of many sunspots was intensified in glacial periods. Climatic Changes Their Nature and Causes 2011-10-28T02:00:24.840Z Another glacial period or an overwhelming catastrophe of cosmic origin may fortunately, at some distant epoch, check the blind process of destruction of natural things and the insane pullulation of humanity. More Science From an Easy Chair In the same way we can explain the occurrence of Arctic vegetation on the Alps and Pyrenees—namely, as left behind by the retreat of the Arctic climate at the close of the glacial period. Darwin, and After Darwin (Vol. 1 and 3, of 3) An Exposition of the Darwinian Theory and a Discussion of Post-Darwinian Questions "Agnes," exclaimed, as I walked to the house with my hands clasped and my eyes raised to the sky, "the glacial period has given thee to me!" My Terminal Moraine 1892 During the glacial period it stood there, its slopes white with snow, apparently as strong and firm as Shasta or Hood or Ranier. The Western United States A Geographical Reader If events at the beginning of the last glacial period took place in accordance with the cyclonic hypothesis, as outlined above, one of the inevitable results would be the production of snowfields. Climatic Changes Their Nature and Causes 2011-10-28T02:00:24.840Z The great ice sheet which crept down over the greater part of the northern hemisphere during the glacial period destroyed the nut forests. Northern Nut Growers Association Report of the Proceedings at the Twenty-Fifth Annual Meeting Battle Creek, Michigan, September 10 and 11, 1934 Once more then, if we mean by primitive, people who inhabited this earth as soon as the vanishing of the glacial period made this earth inhabitable, the Vedic poets were certainly not primitive. India: What can it teach us? A Course of Lectures Delivered before the University Of Cambridge A bit of the glacial period kept in a cave for us! My Terminal Moraine 1892 Geologists tell me that Washington Island and surrounding country plainly shows marks of three distinct glacial periods. Evening Round Up More Good Stuff Like Pep There has been a good deal of debate as to whether these lakes actually date from the glacial period, as is claimed by C. E. P. Brooks, for example, or from some other period. Climatic Changes Their Nature and Causes 2011-10-28T02:00:24.840Z There were at least three glacial periods—and we don't know in which one the Reds went visiting. The Time Traders The glacial periods which have so modified the surface of the earth in the past were the result of temperature changes. The Last Harvest Such facts, which could be very much extended, make it clear that the climate of glacial periods must have been characterized by a great snowfall, and not by the most intense cold. Outlines of the Earth's History A Popular Study in Physiography The suggestion that xanthochroid Aryans were "bleached" by exposure during the glacial period, does not agree with Wallace's doctrine concerning the coloration of Arctic animals. Logic Deductive and Inductive According to the older glacial hypotheses the lower temperature which is postulated as the cause of glaciation would almost certainly mean less evaporation over the oceans and hence less precipitation during glacial periods. Climatic Changes Their Nature and Causes 2011-10-28T02:00:24.840Z See, I will stretch my hand Between it and the sun; the passing shadow Gives its poor dwellers a glacial period. Songs from Vagabondia During the last great glacial period, we may say the fate of the world hung on the operation of those laws which have concerned us throughout this lecture. The Birth-Time of the World and Other Scientific Essays It has not the unique historic position of the first voyage of Columbus, which brought together two streams of human life that had been disjoined since the glacial period. Great Epochs in American History, Volume I. Voyages Of Discovery And Early Explorations: 1000 A.D.-1682 I cannot see the difficulty about the cessation of the glacial period. Alfred Russel Wallace: Letters and Reminiscences, Vol. 1 Moreover, the greatest accumulations of ice in the glacial period were on the poleward border of the general regions where now the storms appear to increase most at times of solar activity. Climatic Changes Their Nature and Causes 2011-10-28T02:00:24.840Z The second was driven, apparently, from the north, by the invasions of the ice, during the glacial period and spread as far, at least, as the Straits of Gibraltar. The Bay State Monthly — Volume 1, No. 3, March, 1884 Were they still under the influence of the glacial period and attempting to imitate the wild doings of Nature? Humanly Speaking On the other hand, those found in the vault were of a peaceful character, and their surroundings would readily comport, in my opinion, to the glacial period. Scientific American Supplement, No. 841, February 13, 1892 I remember, however, speculating that there must have been some immigration during the glacial period from North America or Japan; but I cannot remember what my grounds were. Alfred Russel Wallace: Letters and Reminiscences, Vol. 1 According to the solar-cyclonic hypothesis, the Pleistocene glacial period was inaugurated at a time when certain terrestrial conditions tended to make the earth especially favorable for glaciation. Climatic Changes Their Nature and Causes 2011-10-28T02:00:24.840Z The lake is simply the river valley with the terraces cleaned out, and was probably made when the river was much higher, at a time not far removed from the glacial period. Bowdoin Boys in Labrador An Account of the Bowdoin College Scientific Expedition to Labrador led by Prof. Leslie A. Lee of the Biological Department It is decadent, geologically speaking, and it suffered a good deal during the last glacial period. Humanly Speaking This great flora, in the epoch anterior to, and probably, in part, during the glacial period, had a greater extension northward than it now presents. COSMOS: A Sketch of the Physical Description of the Universe, Vol. 1 That is quite a new and perplexing point which you specify about the freshwater fishes during the glacial period. Alfred Russel Wallace: Letters and Reminiscences, Vol. 1 Today the earth has swung away from the great diversity of the glacial period. Climatic Changes Their Nature and Causes 2011-10-28T02:00:24.840Z In the old arctogæal continent, for instance, in what is now Europe, Asia, and North America, the glacial period made a complete, but of course explicable, change in the faunal life of the region. African and European Addresses They were exterminated by a glacial period not exceeding one hundred and twenty-five years in duration. The Collected Works of Ambrose Bierce, Volume 1 Before the vast surface changes produced during the last glacial period, three of the great lakes—Michigan, Huron and Superior—discharged their waters southward into the Gulf of Mexico by a broad river. Scientific American Supplement, No. 795, March 28, 1891 Then again, the banks were barren, composed of gravel and clay, centuries older than the verdure-covered land, undisturbed, possibly, since some glacial period deposited it there. Through the Grand Canyon from Wyoming to Mexico At least during the later glacial periods the hypothesis must explain numerous climatic epochs and stages superposed upon a single general period of continental upheaval. Climatic Changes Their Nature and Causes 2011-10-28T02:00:24.840Z Burlington is located on Lake Champlain, and contains the summer residence of that grand old survivor of the glacial period, George F. Edmunds. Eugene Field, a Study in Heredity and Contradictions — Volume 1 He seems to have preferred the former for he has managed to survive the terrible glacial periods which upon four different occasions threatened to kill every human being on the face of the earth. The Story of Mankind First, at the beginning of the glacial period the region now known as the Great Basin was an elevated tableland, not furrowed as at present with mountains and valleys, but comparatively bald and featureless. Steep Trails California, Utah, Nevada, Washington, Oregon, the Grand Canyon And if the gulf stream flows southward during the glacial period north, as he supposes probable, the cap on this continent would probably terminate at the same moderately high latitude. Life: Its True Genesis The remarkable phenomena of glacial periods afford perhaps the best available test to which any climatic hypothesis can be subjected. Climatic Changes Their Nature and Causes 2011-10-28T02:00:24.840Z Hence in this glacial period the condition of the country was very different from what it is now. English Villages And so the glacial period, which had threatened to destroy the human race, became its greatest teacher because it forced man to use his brain. The Story of Mankind He is Ab, fighting with an evening meal off the coast of Wales, two glacial periods ago. A Thousand and One Afternoons in Chicago This influence must have been especially heavy toward the end of the glacial period, when the main ice-sheet began to break up into separate glaciers. Travels in Alaska During this same unfortunate first half of the fourteenth century England also suffered from conditions which, if sufficiently intensified, might be those of a glacial period. Climatic Changes Their Nature and Causes 2011-10-28T02:00:24.840Z Next to the Cathedral Rocks on the south side towers the Sentinel Rock to a height of more than 3000 feet, a telling monument of the glacial period. The Yosemite It is my belief—to return to less fanciful hypotheses—that the Antarctic region, with a superficies of more than five millions of square miles, has remained what our spheroid was during the glacial period. An Antarctic Mystery Above these again come strata of diluvial gravel, and about 400 feet below the surface rocks that bore evident traces of a glacial period. Across the Zodiac Perhaps more than a mile in average depth has the range been thus degraded during the last glacial period,—a quantity of mechanical work almost inconceivably great. The Mountains of California It probably plays a considerable part in preparing the way for glacial periods and in making it possible for other factors to produce the more rapid changes which have so deeply influenced organic evolution. Climatic Changes Their Nature and Causes 2011-10-28T02:00:24.840Z The decrease in rain and snowfall since the close of the glacial period in the Sierra is much less than is commonly guessed. The Yosemite Even the alternation of hot and glacial periods has sometimes been ascribed to this source. Curiosities of the Sky M. Desor, in a memoir on the Swiss and Italian lakes, suggested that they may have escaped being obliterated by sedimentary deposition by having been filled with ice during the whole of the glacial period. The Antiquity of Man It is hard without long and loving study to realize the magnitude of the work done on these mountains during the last glacial period by glaciers, which are only streams of closely compacted snow-crystals. The Mountains of California Moreover, each year, almost, brings new evidence of the great complexity of glacial periods, epochs, and stages. Climatic Changes Their Nature and Causes 2011-10-28T02:00:24.840Z But the cause of the remarkable change of climate during those late Tertiary and post-Tertiary times known as the glacial period is still without a completely satisfactory explanation. The Naturalist in Nicaragua The moraines left by secular glacial periods of folly stretch out over many a plain of our civilisation. The Note-Books of Samuel Butler Boulder clay of glacial period, with far transported erratics, some of them polished and scratched, 20 to 80 feet in thickness. The Antiquity of Man All the Sierra rivers and their tributaries in these high regions are thus lost every winter, as if another glacial period had come on. The Mountains of California He reconstructs the history of the glacial period, and points to its final chapter in the nearest Alpine valleys, connecting these facts again with like phenomena in distant parts of the globe. Louis Agassiz: His Life and Correspondence —Difference of the Mollusca on the east and west coast of the Isthmus of Darien.—The refuge of the tropical American animals and plants during the glacial period.—The lowering of the sea-level. The Naturalist in Nicaragua It will come, it will come as surely as the next glacial period, but I shall not live to see it. Philistia Let us suppose with Charpentier that the Alps gained in height several thousand feet at the time when the intense cold of the glacial period was coming on. The Antiquity of Man The decrease in the rain- and snow-fall since the close of the glacial period in the Sierra is much less than is commonly guessed. The Mountains of California I especially desire it for the glacial period and for that fatal cap of ice which frightens me, child of the equator that I am. Louis Agassiz: His Life and Correspondence Now let us suppose that the glacial period were to return, and that the icy covering, gradually thickening in the north, should push down southward as it did once before. The Naturalist in Nicaragua Scientific men perceived in it a confirmation of their theories concerning the glacial period; so through their persuasions the little tract of ground was bought and permanently protected against being built upon. A Tramp Abroad — Volume 04 His second map, of the great submergence of the glacial period, was not essentially different from our map, Figure 39. The Antiquity of Man The glacial periods, of which there seem to have been several in different parts of the earth, and in different geological periods, no doubt checked it when it occurred. Time and Change With reference to the glacial period he anticipated still more positive results. Louis Agassiz: His Life and Correspondence But I believe there is good reason to infer that at the close of the glacial period volcanic energy was much more intense than now. The Naturalist in Nicaragua In one way the southern coast of Alaska may be said to be perhaps a million years younger than any land on this continent, for it is still in the glacial period. The Iron Trail Upon the whole, it is impossible not to be struck with an apparent correspondence in the succession of events of the glacial period of Switzerland and that of the British Isles before described. The Antiquity of Man This is exactly what we see going on during the great physical changes which are accomplished over large areas in Central Asia, owing to the desiccation which is going on there since the glacial period. Mutual Aid; a factor of evolution I think the glacial period is returning and the ice cap is moving down from the North Pole. Letters of Franklin K. Lane Whether this be so or not, there can be no doubt that at the melting away of the ice of the glacial period there was an enormous change in the strains on the earth's crust. The Naturalist in Nicaragua Thus it seems probable that the glacial period with the ice sheet of which we have spoken was brought about by a great elevation of the land, accompanied by a change to intense cold. The Dawn of Canadian History : A Chronicle of Aboriginal Canada Another point of great interest and importance, arising directly from the study of early man is the nature of the events constituting the glacial period in Britain and elsewhere. The Antiquity of Man Mr. Trimmer has suggested, in explanation of such phenomena, the intercalation in the glacial period of large irregular masses of snow or ice between layers of sand and gravel. The Student's Elements of Geology Innumerable boulders, relics of the glacial period, encumbered the track. Letters from High Latitudes I shall not enter upon the question of the cause of the cold of the glacial period. The Naturalist in Nicaragua Some geologists state that the glacial period was sixty thousand years ago. See America First They are seen in some places to rest on the boulder clay of the glacial period, which will be described in future chapters. The Antiquity of Man For some reason not yet understood this was the part of America where snow accumulated most deeply and where the largest glaciers were formed during the last great glacial period. The Red Man's Continent: a chronicle of aboriginal America A rounded pebble, often hardly larger than one's fist, one of those cobbles with which the waters of the glacial period covered the terraces of the Rhone Valley, forms the most popular support. The Mason-Bees We have many facts tending to prove that during the extreme extent of the glacial period the land stood much higher relatively to the sea than it now does. The Naturalist in Nicaragua Is there any reason to suppose that New Zealand could have been more closely connected with South Australia during the glacial period, when the Eucalypti, etc., might have been driven further North? Life and Letters of Charles Darwin — Volume 2 The shells, as a whole, are those of the glacial period, and not of the Norwich Crag. The Antiquity of Man Since early man lived through the successive epochs of the glacial period, he must have been subject to the urgency of vast climatic changes. The Red Man's Continent: a chronicle of aboriginal America With respect to migration during the glacial period: I think Lyell quite comprehends, for he has given me a supporting fact. Life and Letters of Charles Darwin — Volume 1 I have said that during the glacial period, if, as I believe, it was contemporaneous in the two hemispheres, the sea must have stood at least 1000 feet lower than it now does. The Naturalist in Nicaragua If the glacial period were uniformity, what was catastrophe? The Education of Henry Adams The age of this underlying drift, which is 140 feet thick at Natchez, has not yet been determined; but it may possibly belong to the glacial period. The Antiquity of Man But we shall follow the changes more readily, by supposing a new glacial period slowly to come on, and then pass away, as formerly occurred. The Origin of Species by means of Natural Selection, 6th Edition Will it matter, in the days when the glacial period shall have come again, to clothe the earth with silence, whose foot first trod the Pole? Second Thoughts of an Idle Fellow Lands now submerged must have been uncovered, and on the return of the waters at the close of the glacial period many a peopled lowland must have been overwhelmed in the nearly universal deluge. The Naturalist in Nicaragua What upstarts of yesterday are the Pharaohs in comparison with the men who survived the tragedy of the glacial period! The Evolution of Modern Medicine A Series of Lectures Delivered at Yale University on the Silliman Foundation in April, 1913 This must have occurred during some part of the glacial period, which would naturally be a period of heavy precipitation. The Antiquity of Man With respect to more ancient glacial periods, several geologists are convinced, from direct evidence, that such occurred during the miocene and eocene formations, not to mention still more ancient formations. The Origin of Species by means of Natural Selection, 6th Edition Consider the prodigious vicissitudes of climate during the pleistocene period, which includes the whole glacial period, and note how little the specific forms of the inhabitants of the sea have been affected. On the Origin of Species By Means of Natural Selection, or, the Preservation of Favoured Races in the Struggle for Life Mr. Alfred Tylor considers that the ice cap of the glacial period was the cause of a great reduction of the level of the sea, amounting to at least 600 feet.* The Naturalist in Nicaragua We shall see later that the rhinoceros continued in Europe even during the severe conditions of the glacial period, in a branch that developed a woolly coat. The Story of Evolution The weak point of this theory, which is mathematically unassailable, is that it proves too much, and postulates a constant succession of glacial periods throughout earth-history, and for this there is no evidence. The Antiquity of Man So conversely it will be with the northern hemisphere, while the southern passes through a glacial period. The Origin of Species by means of Natural Selection, 6th Edition The refuge of the tropical American animals and plants during the glacial period. The Naturalist in Nicaragua |
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