| 单词 | geological period |
| 例句 | A mountain cabin contains a mock-up mountainous landscape, its Scottish Highland rocks and earthy dust apparently derived from the Precambrian geological period that predates human life. This week's new exhibitions 2012-06-08T23:05:26Z Illustration B shows geological periods in a spiral starting with the beginning of earth’s history at the bottom and ending with modern times at the top. Fundamentals of Biology 2015-01-01T00:00:00Z Sasky is advertised as a luxury re-creation of the Late Pleistocene, that geological period on our home world when humanity was bountifully at ease. Review | ‘The Terraformers’ is a dazzling look at the distant future 2023-01-27T05:00:00Z Hydrates form over long geological periods, largely the result of tiny marine organisms powering their bodies in the absence of oxygen and releasing methane as a byproduct. Report of an ancient methane release raises questions for our climate future 2022-08-24T04:00:00Z Paleontologists are analyzing fossils from a newly excavated site with layers dating from several geological periods. Biology for AP Courses 2022-06-09T00:00:00Z The rate at which different species adapt and go extinct varies between clades and geological periods. Miller & Levine Biology 2018-01-01T00:00:00Z The same geological period is also marked by the appearance of many modern groups of insects, including pollinating insects that played a key role in ecology and the evolution of flowering plants. Fundamentals of Biology 2015-01-01T00:00:00Z As already stated, it is no coincidence that the major extinctions all coincide with boundaries of geological periods and even eras. Physical Geology 2015-01-01T00:00:00Z They cut across geological periods: dinosaurs, mammals, even humans. The pandemic has left a huge cache of dinosaur bones stuck in the Sahara 2021-02-15T05:00:00Z The researchers' best estimate is within the current geological period - so, within the last 2.6 million years. Tsunami risk found near future Indonesian capital 2020-04-22T04:00:00Z But these and later efforts could usually pinpoint biodiversity changes only to within about ten million years, because fossils were lumped into relatively long geological periods and analysed en masse. Supercomputer scours fossil record for Earth’s hidden extinctions 2020-01-15T05:00:00Z A proposed term for the current geological period, “Anthropocene” spotlights mankind’s recent enormous influence on its environment. Review | See a stink bug that’s inches long at a National Zoo show all about insects 2017-12-06T05:00:00Z Smith’s work set the stage for the naming and ordering of the geological periods, which was initiated around 1820, first by British geologists, and later by other European geologists. Physical Geology 2015-01-01T00:00:00Z He created his own maps, studied globes and read books about different geological periods. Middle schooler represented SC at National Geographic Bee 2017-06-25T04:00:00Z This suggest a rapid diversification of walruses during this geological period, perhaps mediated by the rising and falling sea levels. Tuskless 10 Million Year-Old Walrus Ancestor Discovered In Japan 2015-08-06T04:00:00Z Notoriously, the field wrangled for 60 years over the Quaternary, the geological period that enwraps the Holocene. Dot Earth Blog: The 'Anthropocene' as Environmental Meme and/or Geological Epoch 2012-09-17T20:02:03Z “In the Cambrian, creatures called lobopods used soft legs to move along the sea floor,” he said, referring to a geological period around 500 million years ago. Evolutionary history helps explain why humans have two legs 2012-07-23T19:07:50Z I was talking at dinner about the great geological periods of creation. p. 144He said, ‘But it took place in one week.’ Edward Hoare, M.A. A record of his life based upon a brief autobiography 2012-03-28T02:00:25.040Z The earliest period in geological period, extending up to the Lower Silurian. Webster's Unabridged Dictionary 2012-03-24T02:00:23.513Z Fauna, fawn′a, n. animals collectively, or those of a particular country, or of a particular geological period:—pl. Chambers's Twentieth Century Dictionary (part 2 of 4: E-M) 2012-01-11T03:00:23.770Z These grand upheavals have occurred at dates vastly remote from each other, and are recognized by science as great geological periods. Nature and Culture 2011-11-17T03:00:34.107Z It appeared on earth latest at the commencement of the Quaternary geological period, but more probably towards the end of the Tertiary period. Morals and the Evolution of Man 2011-11-14T03:00:18.930Z This is the story of the geological period as known to historical geology. Climatic Changes Their Nature and Causes 2011-10-28T02:00:24.840Z Besides active volcanoes, it is known that former eruptive vents 655 have been abundantly and widely distributed over the globe from the earliest geological periods down to our own day. Encyclopaedia Britannica, 11th Edition, Volume 11, Slice 6 "Geodesy" to "Geometry" 2011-09-19T02:00:10.473Z Large areas of fertile marshes are situated at the head of the bay, and the remains of a submerged forest show that the land has subsided in the latest geological period at least 40 ft. Encyclopaedia Britannica, 11th Edition, Volume 11, Slice 3 "Frost" to "Fyzabad" 2011-08-15T02:00:28.473Z They are distinctly characterised as a portion of the chain of oceanic elevation which began in former geological periods and still continues, by the upheaved coral banks, and by the continuous formation of coral reefs. In the Andamans and Nicobars The Narrative of a Cruise in the Schooner "Terrapin" 2011-06-30T02:00:24.487Z A region of faulting may continue to be so through more than one geological period. Encyclopaedia Britannica, 11th Edition, Volume 10, Slice 2 "Fairbanks, Erastus" to "Fens" 2011-06-19T02:00:16.580Z A climate scarcely warmer than that of New Zealand would foster a flora like that which existed in far northern latitudes during some of the milder geological periods. Climatic Changes Their Nature and Causes 2011-10-28T02:00:24.840Z By 665 means of the evidence which they supply, it has been ascertained that volcanic action has been manifested in the globe since the earliest geological periods. Encyclopaedia Britannica, 11th Edition, Volume 11, Slice 6 "Geodesy" to "Geometry" 2011-09-19T02:00:10.473Z Another allied fact is the simultaneous appearance of like types of life in one and the same geological period, over widely separated regions of the earth’s surface. The Chain of Life in Geological Time A Sketch of the Origin and Succession of Animals and Plants 2011-06-01T02:00:24.880Z Then in the next geological period, the Ordovician, new animals evolved to repopulate the seas. Who You Callin' Shrimp? 2011-05-25T18:30:08Z This is a part of the oldest known land of the continent, and, so far as can be learned, has never been covered by the sea since a very ancient geological period. North America 2011-05-05T02:00:20.027Z As we come down through the vista of years the mild geological periods appear to represent a return as nearly as possible to this standard condition of uniformity. Climatic Changes Their Nature and Causes 2011-10-28T02:00:24.840Z Nor would the erosion of such a system of water-courses require a long series of geological periods for its accomplishment. Encyclopaedia Britannica, 11th Edition, Volume 11, Slice 6 "Geodesy" to "Geometry" 2011-09-19T02:00:10.473Z There can be no doubt that at a comparatively recent geological period the Falls of Niagara had no existence. The Falls of Niagara and Other Famous Cataracts 2011-03-26T02:00:15.717Z In short, we have only to suppose that the Creator exactly adapted organic natures to the several geological periods, and we perfectly explain the phenomena of organic remains. The Religion of Geology and Its Connected Sciences 2011-02-28T03:00:28.890Z The attempt to assign a chronological value to any of our geological periods except the latest, must, in the present state of science, be hopeless. A Manual of the Antiquity of Man 2011-02-21T03:00:07.080Z Strangely enough, the conditions during this time are known with less accuracy than are those of geological periods hundreds of times more remote. Climatic Changes Their Nature and Causes 2011-10-28T02:00:24.840Z Many speculations have been made regarding the chemical composition of the atmosphere during former geological periods. Encyclopaedia Britannica, 11th Edition, Volume 11, Slice 6 "Geodesy" to "Geometry" 2011-09-19T02:00:10.473Z That mammals during certain geological periods were not the dominant group in the fossil record was just the fault of the climate, unfavourable for their development, but favourable for reptiles or fish. Climate research in the geologic past 2011-02-17T16:45:00.337Z That such a new creation occurred at the commencement of several geological periods can hardly admit a doubt. The Religion of Geology and Its Connected Sciences 2011-02-28T03:00:28.890Z There is no historic or legendary record of any eruption, but nevertheless the eruptions must have continued to a very recent geological period. Encyclopaedia Britannica, 11th Edition, Volume 9, Slice 2 "Ehud" to "Electroscope" 2011-01-29T03:00:23.777Z These latter fishes swarmed during the earlier geological periods, and were constructed on what is called a highly generalised type, that is they presented diversified affinities with other groups of organisms. The Descent of Man and Selection in Relation to Sex, Vol. I 2011-01-17T03:00:49.523Z The simpler animals of early times are followed by the more complex and more specialised animals of later geological periods. Charles Darwin 2010-12-24T03:00:33.847Z For them the past offers billions of years of room for redefinition and subdivision, with the beginnings and endings of various geological periods and subperiods tussled over continuously. 2010-01-07T09:04:00Z Others are relics of an earlier geological period, when land areas 736 recently upheaved from the sea were spread at low levels with alternate inundations of salt and fresh water. Encyclopaedia Britannica, 11th Edition, Volume 2, Slice 7 "Arundel, Thomas" to "Athens" Whatever it may have been in remote geological periods, it is now extremely limited both in size and numbers. Encyclopaedia Britannica, 11th Edition, Volume 2, Slice 5 "Arculf" to "Armour, Philip" They appeared at an earlier geological period, and their range was formerly much more extensive than what it now is. The Descent of Man and Selection in Relation to Sex, Vol. I 2011-01-17T03:00:49.523Z Within a recent geological period, central Aragon was undoubtedly submerged by the sea, and the parched chalky soil remains saturated with salt, while many of the smaller streams run brackish. Encyclopaedia Britannica, 11th Edition, Volume 2, Slice 3 "Apollodorus" to "Aral" This cream-colored stone is the outcrop of the latest geological period. The Story of Malta Geology.—Brazil is a region which has been free from violent disturbances since an early geological period. Encyclopaedia Britannica, 11th Edition, Volume 4, Slice 4 "Bradford, William" to "Brequigny, Louis" Varieties are uniform, entirely constant under the most various external conditions, in general cross only with difficulty with related varieties, are not varied by accidental crosses, and persist through geological periods. A Mechanico-Physiological Theory of Organic Evolution These highlands exhibit very considerable evidences of volcanic activity both in remote geological periods and also since the Tertiary epoch. Encyclopaedia Britannica, 11th Edition, Volume 5, Slice 5 "Cat" to "Celt" An endeavour is next made to determine at what geological periods the various migrations entered the British Islands. The History of the European Fauna Species of it are found in all geological periods of the secondary strata; but they have not been seen in the tertiary beds. Principles of Geology or, The Modern Changes of the Earth and its Inhabitants Considered as Illustrative of Geology Geology informs us that in the period of which it is cognizant the vegetation of the earth has been several times renewed, and that no plants of the older and middle geological periods now exist. The Origin of the World According to Revelation and Science They possess in fact all the characteristics of a portion of the continent, separated from it at a recent geological period. Island Life Or the Phenomena and Causes of Insular Faunas and Floras But we do not credit the theory, even as applied to former geological periods in the history of our globe. Soil Culture Erebia migrations seem therefore to have taken place by the Southern or Oriental route at different geological periods. The History of the European Fauna From the facts above mentioned, the reader will infer that in the course of successive geological periods there will be great variations in the quantity of rain falling in one and the same region. Principles of Geology or, The Modern Changes of the Earth and its Inhabitants Considered as Illustrative of Geology It might also aid in accounting for the extraordinary evidences of desert conditions and desiccation presented by the salt deposits of different geological periods in temperate latitudes. The Origin of the World According to Revelation and Science We have no single example of such defenceless birds having ever existed on a continent at any geological period, whereas analogous though totally distinct forms do exist in New Zealand, where enemies are equally wanting. Island Life Or the Phenomena and Causes of Insular Faunas and Floras They were fixed on the speaker with all the solemnity the contemplation of a geological period of Time inspires. When Ghost Meets Ghost They inhabit wet and sandy places, and sometimes are of a considerable size even in the present day, but in ancient geological periods they attained the proportions of trees. The Contemporary Review, Volume 36, September 1879 That there has been land as well as sea at all former geological periods, we know from the fact, that fossil trees and terrestrial plants are imbedded in rocks of every age. Principles of Geology or, The Modern Changes of the Earth and its Inhabitants Considered as Illustrative of Geology There is but one system of organic nature; but, to exhibit the whole of it, not only all the climates and conditions now existing are required, but those also of all past geological periods. The Origin of the World According to Revelation and Science Again, it has been answered that transitional geological periods, in which there is much change in the physical geography of a country, will produce more rapid evolution than we at present are experiencing. The Meaning of Evolution The question naturally arises whether one of those divisions, on its first appearance, was of the lowest organization of its class and reached the highest by a gradual development through successive geological periods. The Christian Foundation, Or, Scientific and Religious Journal, Volume I, No. 7, July, 1880 Here he found reason to believe that all the great plains which he was surveying had been raised above the sea level in a modern geological period. Life of Charles Darwin In older geological periods they were not less common; for example, in the Carboniferous in Scotland. Encyclopaedia Britannica, 11th Edition, Volume 3, Part 1, Slice 3 "Banks" to "Bassoon" Days of creation, 115. of creation compared with geological periods, 155. prophetic, 65. The Origin of the World According to Revelation and Science And as the name is Cornish, it follows that Cornish-speaking people must have lived in Cornwall at that early geological period. Chips From A German Workshop. Vol. III. Essays on Literature, Biography, and Antiquities And, consequently, how poor will be his results compared with those accumulated by Nature during whole geological periods! The World's Greatest Books — Volume 15 — Science "There weren't any dates then, unless they counted the geological periods; and the Tower of Babel came later, so the French language wasn't invented," objected Tattie. A harum-scarum schoolgirl Looking back on it from our own time, it seems more like a geological period than the life history of a single nation. The Eye of Osiris Some taxidermists produce rock work of an obscure geological period by covering screen wire forms with a mixture of flour, baking powder and plaster of paris and water. Home Taxidermy for Pleasure and Profit A Guide for Those Who Wish to Prepare and Mount Animals, Birds, Fish, Reptiles, etc., for Home, Den, or Office Decoration How fleeting are the wishes and efforts of man! how short his time! and consequently how poor will his products be, compared with those accumulated by Nature during whole geological periods. On the Origin of Species by Means of Natural Selection or the Preservation of Favoured Races in the Struggle for Life. (2nd edition) On the contrary, we find a progressive development of organic life at successive geological periods. The World's Greatest Books — Volume 15 — Science But yet more important is the probability, nay almost the certainty, that whole formations containing the records of vast geological periods are entirely buried beneath the ocean, and for ever beyond our reach. Contributions to the Theory of Natural Selection A Series of Essays Moreover many groups of organisms show in earlier geological periods a richness of development from which they have now fallen far away. The Theories of Darwin and Their Relation to Philosophy, Religion, and Morality And, as time rolled on its geological periods, the newly born sub-races began to lose their natal capacities. The Story of Atlantis and the Lost Lemuria And yet this space of time, from the Pliocene Age to our own, must, geologically speaking, be extremely insignificant compared to the length of the great geological periods. From Pole to Pole A Book for Young People He appeals to our terror of the infinite, to the shrinking of the human mind before astronomical distances and geological periods of time. Hours in a Library, Volume I. (of III.) Most of the larger and some small groups extend through several geological periods. Contributions to the Theory of Natural Selection A Series of Essays But as the present rate of salt-accumulation is probably much greater than it was during many of the geological periods, the prodigious age just mentioned is in all likelihood far below the mark. The Outline of Science, Vol. 1 (of 4) A Plain Story Simply Told Thus the Cainozoic era would embrace all the geological periods from Eocene to Recent. Encyclopaedia Britannica, 11th Edition, Volume 4, Part 4 "Bulgaria" to "Calgary" In a general sense we may regard the Bryophyta as derived from an algal ancestry, without being able to suggest the nature of the ancestral forms or the geological period at which they arose. Encyclopaedia Britannica, 11th Edition, Volume 4, Part 3 "Brescia" to "Bulgaria" The six days of Creation were six eons or geological periods. Little Journeys to the Homes of the Great - Volume 12 Little Journeys to the Homes of Great Scientists Their colour is that of dusky honey or dun amber; for they are not built of marble, but of sandstone, which at some not very distant geological period must have been a sea-bed. Sketches and Studies in Italy and Greece, Third series As these accidents write their history upon the ground alone, and in a way impermanently, it is difficult to trace the ice times of ancient geological periods. Outlines of the Earth's History A Popular Study in Physiography Father failed perhaps two or three times in a whole winter to notice my light for nearly ten minutes, magnificent golden blocks of time, long to be remembered like holidays or geological periods. The Story of My Boyhood and Youth Suppose one of these beings to be contemplating our geological periods, and slow causes will to him appear rapid causes, and the question of intelligence will be the same for him as for us. The Heavenly Father Lectures on Modern Atheism Many a change during the geological periods have these granite mountains looked upon. The Bay State Monthly, Volume 3, No. 2 The earliest recognised method of arriving at an estimate of the Earth's geological age is based upon the measurement of the collective sediments of geological periods. The Birth-Time of the World and Other Scientific Essays Records of vast geological periods are entirely buried beneath the ocean ... beyond our reach. Alfred Russel Wallace: Letters and Reminiscences, Vol. 1 The best conclusions of scientists in regard to the geological periods of our planet consider that the Glacial Epoch began about two hundred and forty thousand, and ended about eighty thousand, years ago. John L. Stoddard's Lectures, Vol. 10 (of 10) Southern California; Grand Canon of the Colorado River; Yellowstone National Park I am inclined to think after all that we will begin with the geological periods. Kit of Greenacre Farm Wolverines,—unchanged in form from another geological period—marten, mink, fisher, otter, ermine, muskrat, lynx, foxes, beaver carried on their varied affairs of murder or of peaceful industry. The Silent Places During the tertiary period—the last of the great geological periods—the brain in many groups of mammals increased in size, both absolutely and relatively, eight to tenfold. The Whence and the Whither of Man A Brief History of His Origin and Development through Conformity to Environment; Being the Morse Lectures of 1895 Disused Mooring-Post on bank of the Rother, Rye The Isle of Wight in remote geological periods was part of the mainland. Vanishing England When, "during what geological periods did this nascent race flourish?" the same impressive voice replies: "In prehistoric ages, the duration of which no one can now determine." Five Years of Theosophy A recent observation by Sir Wyville Thomson would, however, render it not improbable that some of the great argillaceous accumulations of past geological periods may be really organic. The Ancient Life History of the Earth A Comprehensive Outline of the Principles and Leading Facts of Palæontological Science He presented these figures with an explanatory memoir at the Academy, and announced them as belonging to some creation preceding the present, since no such animals had ever existed in our own geological period. The Atlantic Monthly, Volume 12, No. 71, September, 1863 How fleeting are the wishes and efforts of man! how short his time! and consequently how poor will be his results, compared with those accumulated by nature during whole geological periods! A Series of Lessons in Gnani Yoga In the nineteenth century we talked very glibly about geological periods, and flung millions of eons about in the most lordly manner in our reaction against Archbishop Ussher's chronology. Back to Methuselah But there is a fascinating mystery in considering that even as species correspond to certain geological periods and thus group their sympathies, even so to-day they group themselves according to the seasons. Romance of the Rabbit Exceptions to this, however, are occasionally to be found in some "persistent types," which extend through a succession of geological periods with very little modification. The Ancient Life History of the Earth A Comprehensive Outline of the Principles and Leading Facts of Palæontological Science The heavens at some unknown geological period seemed to have showered down huge volcanic paving-stones, until the earth was covered fifty feet deep with their broken fragments. Tent Life in Siberia They differ from them as all early animals differ from the succeeding ones, every geological period having its special set of representatives. The Atlantic Monthly, Volume 09, No. 55, May, 1862 He wished to know why the sacred books were being dislocated and tortured in order to explain by geological periods the creation which God had accomplished in six days. The Shadow of the Cathedral The same principle according to which animal and vegetable life is distributed over the surface of the earth now prevailed in the earliest geological periods. The Atlantic Monthly, Volume 11, No. 66, April, 1863 Never, in all probability, shall we be able to point to a complete series of deposits, or a complete succession of life linking one great geological period to another. The Ancient Life History of the Earth A Comprehensive Outline of the Principles and Leading Facts of Palæontological Science Sure enough the lake was there, but it had been dry since a previous geological period. The Mountains Leaving aside, then, all historical chronology, how far back can we trace our own geological period, and the Species belonging to it? The Atlantic Monthly, Volume 09, No. 55, May, 1862 These alone could raise the obscure cell of the early geological periods to the superior beings whose inventions were to change the face of the earth. The Psychology of Revolution There is, however, ample evidence that at several distinct geological periods the region has been the seat of great volcanic activity. The Project Gutenberg Encyclopedia Volume 1 of 28 Still, we are in many cases able to draw completely reliable conclusions as to the climate of a given geological period, by an examination of the fossils belonging to that period. The Ancient Life History of the Earth A Comprehensive Outline of the Principles and Leading Facts of Palæontological Science At a later geological period the great plains to the north and east of Santo Domingo City were formed. Santo Domingo A Country with a Future It consists of pudding-stone, "a strange solitary exiled peak, drifted away in the beginning of things from its brethren of the Pyrenees, and stranded in a different geological period." Castles and Cave Dwellings of Europe Subsequently, I have referred to the growth of the continent in different geological periods. Scientific American Supplement, No. 384, May 12, 1883 The crystalline massif, therefore, presents a solid block which has remained elevated since early palaeozoic times, and against which earth waves of several geological periods have broken. The Project Gutenberg Encyclopedia Volume 1 of 28 My eyes have grown dim over books; believing in geological periods, cave-dwellers, Chinese Dynasties, and the fixed stars has prematurely aged me. Trivia In a recent geological period this island as well as Java and Sumatra formed part of Asia. Through Central Borneo; an Account of Two Years' Travel in the Land of Head-Hunters Between the Years 1913 and 1917 This," said Steelman, breaking the rotten piece between his fingers, "belongs probably to an older geological period than its position would indicate—a primitive sandstone level perhaps. While the Billy Boils Looking back on it from our own time, it seems more like a geological period than the life-history of a single nation. The Vanishing Man A year of individual life is the symbol of a geological period of progression. American Big Game in Its Haunts Their age does not, therefore, go back to earlier geological periods; they belong to our times, geologically speaking. Louis Agassiz: His Life and Correspondence And he comes to the conclusion that these very countries have been singularly free from any great changes of the kind for long geological periods. Life and Letters of Thomas Henry Huxley — Volume 3 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 If I live till the next geological period I never shall love anybody as insanely as you love. Beulah Not only have some of these basins been forming for countless ages, but others exist which must have been completed in a former geological period. A Week on the Concord and Merrimack Rivers If there is a type of Echinoderms characteristic of a geological period, it is the genus Micraster of the cretaceous formation, in its original circumscription. Louis Agassiz: His Life and Correspondence From finds that have been made in other parts of Antarctica it is known that in former geological periods -- the Jurassic epoch -- even this desolate continent possessed a rich and luxurious vegetation. The South Pole; an account of the Norwegian Antarctic expedition in the "Fram," 1910-12 — Volume 1 and Volume 2 It will be seen in the following chapters that in the earth's crust there are volcanic tuffs of all ages, containing marine shells, which bear witness to eruptions at many successive geological periods. The Student's Elements of Geology In all cases the origin of the gas is thought to be in the destructive distillation, extending through long geological periods, of coal or of other vegetable or animal matter in the earth's interior. An Introduction to Chemical Science We will not be confined by historical, even geological periods which would allow us to doubt of a progress in human affairs. A Week on the Concord and Merrimack Rivers Innumerable questions of this kind, of great importance for zoology, are suggested at every step, as soon as we compare the present distribution of animals with that of the inhabitants of former geological periods. Louis Agassiz: His Life and Correspondence But there is no cause for uneasiness: the inundation is at hand, which has never failed since the commencement of our geological period. Egypt (La Mort de Philae) I shall now select examples of contemporaneous volcanic rocks of successive geological periods, to show that igneous causes have been in activity in all past ages of the world. The Student's Elements of Geology In opposition to prevalent views on this subject, Darwin points out that his observations are opposed to the conclusion that a higher temperature prevailed universally over the globe during early geological periods. Geological Observations on South America They have not left so distinct a trace as the delicate flower of a remote geological period on the coal in my grate. A Week on the Concord and Merrimack Rivers From finds that have been made in other parts of Antarctica it is known that in former geological periods — the Jurassic epoch — even this desolate continent possessed a rich and luxurious vegetation. The South Pole; an account of the Norwegian antarctic expedition in the "Fram," 1910-1912 — Volume 2 And the silver moonlight silvers the silver-sand, while the skeletons of the Xth sink deeper and deeper, to be rediscovered perhaps at some future geological period, and recognised as a type of primitive man. At Suvla Bay Being the notes and sketches of scenes, characters and adventures of the Dardanelles campaign, made by John Hargrave ("White Fox") while serving with the 32nd field ambulance, X division, Mediterranean expeditionary force, during the great war. Between the period when a Plutonic rock crystallises in the subterranean regions and the era of its protrusion at any single point of the surface, one or two geological periods must usually intervene. The Student's Elements of Geology With a simple sweep it carries me back over a stretch of time measurable only in astronomical terms and geological periods. Mark Twain's Letters — Volume 5 (1901-1906) They believe it will take nineteen geological periods to breed her match. Mark Twain's Speeches Then in the late geological period known as the early Tertiary the land was lifted up again, and once more erosion went on. The Red Man's Continent: a chronicle of aboriginal America Eruptions on parallel lines of fissure within the same geological period. Volcanic Islands For eruptions are repeated at uncertain intervals throughout the whole or a large part of a geological period, some of the surrounding and contiguous districts remaining quite undisturbed. The Student's Elements of Geology When you speak of plants having undergone more change since old geological periods than animals, are you not rather comparing plants with higher animals? More Letters of Charles Darwin — Volume 1 They appeared at an earlier geological period, and their range was formerly much more extensive than at present. The Descent of Man Hence, with respect to terrestrial productions, a tract of country, which had oftenest within the late geological periods subsided and been converted into islands, and reunited, I should expect to contain most forms. Life and Letters of Charles Darwin — Volume 1 FLORA.—The totality of the plants growing naturally in a country, or during a given geological period. The Origin of Species by means of Natural Selection, 6th Edition In short there are no general regions, not even for each class separately, unless this class be one which is confined to a comparatively short geological period. Darwin and Modern Science What a curious case is offered by land-shells, which become modified in every sub-district, and have yet retained the same general structure from very remote geological periods! More Letters of Charles Darwin — Volume 1 These latter fishes swarmed during the earlier geological periods, and were constructed on what is called a generalised type, that is, they presented diversified affinities with other groups of organisms. The Descent of Man This was not a fish, but the fossil remains of a reptile of one of the earliest geological periods. First Across the Continent The story of the exploring expedition of Lewis and Clark in 1804-5-6 This period will seldom be remote in any extreme degree, as species rarely endure for more than one geological period. The Origin of Species by means of Natural Selection, 6th Edition The Sub-kingdom of the higher Spore-plants, the Cryptogamia possessing a vascular system, was more prominent in early geological periods than at present. Darwin and Modern Science Even now they afford a most interesting page in the story of evolution, and their total disappearance from the face of the earth in the next geological period will not be unintelligible. The Story of Evolution The succession of the same types of structure within the same areas during the later geological periods ceases to be mysterious, and is intelligible on the principle of inheritance. The Origin of Species by means of Natural Selection, 6th Edition FAUNA.—The totality of the animals naturally inhabiting a certain country or region, or which have lived during a given geological period. The Origin of Species by means of Natural Selection, 6th Edition Whether organisation on the whole has actually advanced from the remotest geological periods to the present day will be more conveniently discussed in our chapter on Geological Succession. The Origin of Species by means of Natural Selection, 6th Edition Mr. Croll, in an interesting paper, remarks that we do not err "in forming too great a conception of the length of geological periods," but in estimating them by years. The Origin of Species by means of Natural Selection, 6th Edition And within a single geological period the overwhelming majority of them, especially the larger and more formidable of them, were ruthlessly slain, leaving not a single descendant on the earth. The Story of Evolution The total area was probably greater than the enormous area covered with ice in Europe and America during the familiar ice-age of the latest geological period. The Story of Evolution In the succeeding geological period, the Oligocene, we find several horse-types in which the adaptation of the limbs to running on the firm grassy plains and of the teeth to eating the grass continues. The Story of Evolution We have evidence of almost every conceivable kind, organic and inorganic, that, within a very recent geological period, central Europe and North America suffered under an Arctic climate. The Origin of Species by means of Natural Selection, 6th Edition The prolonging of such conditions during a geological period can be understood to have caused the accumulation of fields of snow and ice in the higher regions. The Story of Evolution |
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