| 单词 | boulder clay |
| 例句 | Happisburgh, home to about 1,100 people, is so susceptible to erosion because the cliffs are made from boulder clay which slumps when wet. Happisburgh: The Norfolk village crumbling into the sea 2022-12-30T05:00:00Z Classification of Glacial Deposits—Interglacial Epochs.—Had the deposits of glaciated regions consisted solely of boulder clay little difficulty might have been experienced in dealing with their classification. Encyclopaedia Britannica, 11th Edition, Volume 12, Slice 1 "Gichtel, Johann" to "Glory" 2012-01-11T03:00:20.463Z Glacial boulder clay lies over much of the lower ground, and ridges of gravel and sand flank the hills and form extensive sheets. Encyclopaedia Britannica, 11th Edition, Volume 12, Slice 7 "Gyantse" to "Hallel" 2011-12-26T03:00:11.613Z Most of the county is covered by a superficial deposit of glacial drifts, sands, gravel and in places boulder clay, as at Epping, Dunmow and Hornchurch where the drift lies beneath the Thames gravel. Encyclopaedia Britannica, 11th Edition, Volume 9, Slice 7 "Equation" to "Ethics" 2011-02-27T03:00:31.973Z The largest transported mass occurs at Linksfield, where a succession of limestones and shales rests on boulder clay and is covered by it, which from the fossils may be of Rhaetic or Lower Lias age. Encyclopaedia Britannica, 11th Edition, Volume 9, Slice 3 "Electrostatics" to "Engis" 2011-02-06T03:00:53.093Z Hence the boulder clay of the lowland districts is abundantly charged with boulders of schistose grit, slate, gneiss and granite derived from areas lying far to the north-west. Encyclopaedia Britannica, 11th Edition, Volume 8, Slice 8 "Dubner" to "Dyeing" 2010-12-26T03:00:17.840Z Great deposits of till and boulder clay that lay beneath the glaciers were abandoned in situ, and remain as an unsorted mixture of large boulders, pebbles and mingled fragments, embedded in clay or sand. Encyclopaedia Britannica, 11th Edition, Volume 12, Slice 1 "Gichtel, Johann" to "Glory" 2012-01-11T03:00:20.463Z The stones in our boulder clay are polished and scratched in a way glaciers are known to polish and scratch the stones they carry along, and rub against the rocks and other stones. The Geological Story of the Isle of Wight Much boulder clay is of a bluish-grey colour where unexposed, but it becomes brown upon being weathered. Encyclopaedia Britannica, 11th Edition, Volume 4, Slice 3 "Borgia, Lucrezia" to "Bradford, John" At first, when traces of a temperate flora and fauna were discovered intercalated between two layers of boulder clay, their presence was explained by the supposition of a mild inter-glacial period. The History of the European Fauna The deposit strictly resembles a consolidated modern boulder clay. Encyclopaedia Britannica, 11th Edition, Volume 5, Slice 2 "Camorra" to "Cape Colony" Farther east where the two tracks of the New York and New England railroads converge, a cut shows a section of at least 40 feet of boulder clay. Drainage Modifications and Glaciation in the Danbury Region Connecticut State of Connecticut State Geological and Natural History Survey Bulletin No. 30 At this place a human fibula was found under a layer of boulder clay. The Origin of the World According to Revelation and Science Occasionally, within the boulder clay, there are irregular lenticular masses of more or less stratified sand, gravel or loam. Encyclopaedia Britannica, 11th Edition, Volume 4, Slice 3 "Borgia, Lucrezia" to "Bradford, John" The boulder clay of Germany is supposed to have accumulated underneath this vast "mer de glace," as he calls it. The History of the European Fauna Superimposed on these rocks are Pleistocene boulder clay, and clay and sand deposited in post-glacial lakes or an extension of the Gulf of St Lawrence. Encyclopaedia Britannica, 11th Edition, Volume 5, Slice 2 "Camorra" to "Cape Colony" It consists of a jumbled mass of morainal hills, seemingly of boulder clay, that rise from 50 to 60 feet above the level of the ponds. Drainage Modifications and Glaciation in the Danbury Region Connecticut State of Connecticut State Geological and Natural History Survey Bulletin No. 30 Much glacial boulder clay covers all the higher ground of the county; it is a stiff brownish clay with many chalk fragments of travelled rocks. Encyclopaedia Britannica, 11th Edition, Volume 5, Slice 1 "Calhoun" to "Camoens" With the exception of foraminifera which have been found in the boulder clay of widely separated regions, fossils are practically unknown; but in some maritime districts marine shells have been incorporated with the clay. Encyclopaedia Britannica, 11th Edition, Volume 4, Slice 3 "Borgia, Lucrezia" to "Bradford, John" The latter is generally spoken of as "boulder clay," and, with the associated sand and gravel, it may be observed equally well in Russia or Germany, in England or Ireland. The History of the European Fauna This boulder clay covers almost all the low ground north of the Thames Basin, its southern margin fading away into washed sands and gravels. Encyclopaedia Britannica, 11th Edition, Volume 9, Slice 4 "England" to "English Finance" The more usual arrangement is boulder clay overlain by modified drift, the first being laid down by the ice itself, the second being deposited by streams from the melting glacier in its retreat. Drainage Modifications and Glaciation in the Danbury Region Connecticut State of Connecticut State Geological and Natural History Survey Bulletin No. 30 Near Ely there is a remarkable mass of chalk, evidently transported by ice, resting on and surrounded by boulder clay. Encyclopaedia Britannica, 11th Edition, Volume 5, Slice 1 "Calhoun" to "Camoens" To construct it the men had to cut the boulder clay—very unpleasant p. 8stuff to deal with—to hew through granite, to build on morasses and dismal swamps. The Cruise of the Elena or Yachting in the Hebrides The deposits immediately preceding the Forest-Bed would also be contemporaneous with the lower continental boulder clay. The History of the European Fauna The Dombes is characterized by an impervious surface consisting of boulder clay and other relics of glacial action. Encyclopaedia Britannica, 11th Edition, Volume 8, Slice 6 "Dodwell" to "Drama" These are properly parts of the Croton River system, but Andrew Pond has been held back by the deep filling of boulder clay in the valley. Drainage Modifications and Glaciation in the Danbury Region Connecticut State of Connecticut State Geological and Natural History Survey Bulletin No. 30 The term was formerly given to the “boulder clay” deposits, supposed to have been caused by the Noachian deluge. Encyclopaedia Britannica, 11th Edition, Volume 8, Slice 4 "Diameter" to "Dinarchus" In the regions of the country where the drift soil, left by the great ice-sheet, lies deepest, the glacial boulder clay is very far down. Earth and Sky Every Child Should Know Easy studies of the earth and the stars for any time and place Sir A. Geikie, who has himself discovered many similar buried valleys, is of opinion that "they unquestionably belong to the period of the boulder clay." Island Life Or the Phenomena and Causes of Insular Faunas and Floras I can now, however, entertain little doubt that it belonged to the boulder clay period of submergence, and that the fauna with which it was associated bore the ordinary sub-arctic character. My Schools and Schoolmasters or The Story of my Education. 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 They consist of pieces of chalk, similar to those which drop annually in thousands upon thousands down the cliffs from the boulder clay between Bridlington and Flamborough. Ancient Egyptian and Greek Looms It is not clear, but black with mud, called boulder clay, or till, made of ground rock, and mixed with fragments of all shapes and sizes. Earth and Sky Every Child Should Know Easy studies of the earth and the stars for any time and place There are abundant evidences of glaciation, and much boulder clay and drift sand covers the older rocks. Encyclopaedia Britannica, 11th Edition, Volume 2, Part 1, Slice 1 Screw piles may be used if the ground is suitable, but, if it is boulder clay or similar material, the best results will probably be obtained by employing rolled steel joists as piles. The Sewerage of Sea Coast Towns And this boulder clay, as Mr. Jukes Brown further observes, has forced its way up the sides of the chalk, in places, to a height varying from 300ft. to 400ft. Records of Woodhall Spa and Neighbourhood Historical, Anecdotal, Physiographical, and Archaeological, with Other Matter If you try for seven years, I believe, you will never contrive to make your pebbles lie about in your mud, as they lie about in every pit in the boulder clay. Town Geology The finest material deposited is rock meal, ground by the great glacial mill, and called "boulder clay." Earth and Sky Every Child Should Know Easy studies of the earth and the stars for any time and place The overlying unstratified boulder clays 3 and 4 were thrown down in deeper water by the aid of floating ice coming from the north. The Antiquity of Man Our course at first lay up the banks of a torrent that had cut deeply into beds of boulder clay filled with great stones. The Naturalist in Nicaragua In Denmark, also, recent shells have been found in stratified beds, closely associated with the boulder clay. The Student's Elements of Geology There seem to be only three or four instances as yet known in all Scotland of mammalia having been discovered in boulder clay. The Antiquity of Man The glacier that lodged it there, also rounded the granite dome in Central Park and scattered the rock-strewn boulder clay on Long Island. Earth and Sky Every Child Should Know Easy studies of the earth and the stars for any time and place Already, perhaps, the melting ice has thrown down till and boulders upon those poles, a counterpart of the boulder clay which overlies the forest-bed on the Norfolk cliffs. The Antiquity of Man The range was very steep, and fully 1200 feet high, composed entirely of boulder clay. The Naturalist in Nicaragua On this sand a great mass of boulder clay usually quite devoid of fossils was accumulated. The Student's Elements of Geology The boulder clay Number 2 extends for miles in all directions, and was evidently once continuous from b to c before the valley was scooped out. The Antiquity of Man Yet the oldest memorials of our species at present discovered in Great Britain are post-glacial, or posterior in date to the boulder clay, Number 4, Figures 27 and 33. The Antiquity of Man 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 The ground was entirely composed of boulder clay, and not until we had travelled about five miles did we see any rock in situ. The Naturalist in Nicaragua Another curious phenomenon bearing on this subject was styled by the late Hugh Miller the "striated pavements" of the boulder clay. The Student's Elements of Geology The fluvio-marine series usually terminates upwards in finely laminated sands and clays without fossils, on which reposes the boulder clay. The Antiquity of Man The deposit c in that section consists of sand, mud, gravel, and stones, for the most part unstratified, resembling the till or boulder clay of Europe. The Antiquity of Man The glacial till Number 4 then originated, and the gravel and sands Number 5 were afterwards superimposed on the boulder clay, first in horizontal beds, which became subsequently contorted. The Antiquity of Man This boulder clay had extended all the way from San Rafael, and ranges of hills appeared to be composed entirely of it. The Naturalist in Nicaragua The incumbent till or boulder clay is about 40 feet thick, but it often attains much greater thickness in the same part of Scotland. The Student's Elements of Geology The greatest height to which marine shells have yet been traced in this boulder clay is at Airdie, in Lanarkshire, ten miles east of Glasgow, 524 feet above the level of the sea. The Student's Elements of Geology The difficulty, moreover, of accounting for the entire dearth of marine shells in till is removed when once we have adopted the theory of this boulder clay being the product of land-ice. The Student's Elements of Geology He distinguishes the boulder clay, under the name of "the old alluvial cover," from that more modern alluvium, in which the whales of Airthrie, described in Chapter 3, were found. The Antiquity of Man Upland gravel of various kinds and periods, consisting in some places of unstratified boulder clay or glacial drift. The Student's Elements of Geology |
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