Geology

257 quotes found

"The abrupt manner in which whole groups of species suddenly appear in certain formations has been urged by several paleontologists . . . as a fatal objection to the belief in the transmutation of species. If numerous species, belonging to the same genera or families, have really started into life at once, the fact would be fatal to the theory of evolution through natural selection. For the development by this means of a group of forms, all of which are descended from some one progenitor, must have been an extremely slow process; and the progenitors must have lived long before their modified descendants. But we continually overrate the perfection of the geological record, and falsely infer, because certain genera or families have not been found beneath a certain stage, that they did not exist before that stage. In all cases positive palæontological evidence may be implicitly trusted; negative evidence is worthless, as experience has so often shown. We continually forget how large the world is, compared with the area over which our geological formations have been carefully examined; we forget that groups of species may elsewhere have long existed, and have slowly multiplied, before they invaded the ancient archipelagoes of Europe and the United States. We do not make due allowance for the intervals of time which have elapsed between our consecutive formations,—longer perhaps in many cases than the time required for the accumulation of each formation. These intervals will have given time for the multiplication of species from some one parent-form: and in the succeeding formation, such groups or species will appear as if suddenly created."

- Paleontology

0 likesGeologyBiology
"Strabo,... enters largely, in the Second Book of his Geography, into the opinions of Eratosthenes and other Greeks on one of the most difficult problems in geology, viz., by what causes marine shells came to be plentifully buried in the earth at such great elevations and distances from the sea. He notices, amongst others, the explanation of Xanthus the Lyclian, who said that the seas had once been more extensive, and that they had afterwards been partially dried up, as in his own time many lakes, rivers, and wells in Asia had failed during a season of drought. Treating this conjecture with merited disregard, Strabo passes on to the hypothesis of Strato, the natural philosopher, who had observed that the quantity of mud brought down by rivers into the Euxine was so great, that its bed must be gradually raised, while the rivers still continued to pour in an undiminished quantity of water. He therefore conceived that, originally, when the Euxine was an inland sea, its level had by this means become so much elevated that it burst its barrier near Byzantium, and formed a communication with the Propontis, and this partial drainage had already, he supposed, converted the left side into marshy ground, and that, at last, the whole would be choked up with soil. So, it was argued, the Mediterranean had once opened a passage for itself by the Columns of Hercules into the Atlantic, and perhaps the abundance of sea-shells in Africa, near the Temple of Jupiter Ammon, might also be the deposit of some former inland sea, which had at length forced a passage and escaped."

- Geology

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"…Next Morn before Break of Day we directed our Steps to the anciently fame’d, but now ruin’d City of Canorein; the way to it is so delightsome, I thought I had been in England; fine Arable, Pasture, and Coppices; thus we passed Five Mile to the Foot of the Hill on which the City stands, and had passed half a Mile through a thick Wood, peopled by Apes, Tygers, wild Buffolo’s, and Jackalls; here were some Flocks of Parockets: When we alighted, the Sun began to mount the Horizon over the Hills, and under our Feet, as if he had newly bathed his fiery Coursers; there appeared the Mouth of a Tank, or Aqueduct, out of a Rock, whose steaming Breath was very hot, but water cold: From hence it is thought the whole City to be supplied with Water; for as we ascend, we find such Places, where convenient, filled with Limpid Water, not over-matched in India: If it be so, (as I know not how to contradict it) that it should have its Current upwards, through the hard Rocks artificially cut, the World cannot parallel so wonderful a Water-course! From hence the Passage is uneasy and inaccessible for more than two abreast, till we come to the City, all cut out of a Rock; where is presented Vulcan’s Forge, supported by two mighty Colosses, bellied in the middle with two Globes. Next a Temple with a beautiful Frontispiece not unlike the Portuco of St. Paul’s West Gate: Within the Porch on each side stand two Monstrous Giants [the Chaitya Caves, the giants being Buddhas], where two Lesser and one Great Gate give a noble Entrance; it can receive no Light but at the Doors and Windows of the Porch, whereby it looks more solemnly; the Roof is Arched, seeming to be born up by huge Pillars of the same Rock, some Round, some Square, 34 in number. The Cornish Work of Elephants, Horses, Lions; at the upper end it rounds like a Bow; near where stands a great Offertory somewhat Oval, the Body of it without Pillars, they only making a narrow Piatzo about, leaving the Nave open: It may be an 100 Feet in Length, in Height 60 Feet or more. Beyond this, by the same Mole-like Industry, was worked out a Court of Judicature (as those going to shew it will needs give Names) or Place of Audience, 50 Feet square, all bestuck with Imagery, Well Engraven according to old Sculpture. On the Side, over against the Door, sate one Superintendent, to whom the Brachmin went with us, paid great Reverence, not speaking of him without a token of worship; whom we called Jougy [jogi], or the Holy Man; under this the way being made into handsome Marble Steps, are the King’s Stables, not different from the Fashion of our Noblemens Stables, only at the head of every Stall seems to be a Dormitory, or Place for Devotion, with Images, which gave occasion to doubt if ever for that End; or rather made for an Heathen Seminary of Devotes and these their Cells or Chappels, and the open Place their Common Hall or School: More aloft stood the King’s Palace, large, stately and magnificent, surrounded with lesser of the Nobility. To see all, would require a Month’s time; but that we might see as much as could be in our allotted time, we got upon the highest part of the Mountain, where we feasted our Eyes with innumerable Entrances of these Cony-burrows, but could not see one quarter part. Whose Labour this should be, or for what purpose, is out of memory; but this Place by the Gentiles is much adored…the Portugals, who are now Masters of it, strive to erace the remainders of this Herculean Work, that it may sink into the oblivion of its Founders."

- Kanheri Caves

0 likesHistory of IndiaGeologyCaves
"... Glaciers are formed on any portion of the earth’s surface that is permanently above the . This line varies locally in the same latitudes, being in some places higher than in others, but in the main it may be described as an elliptical shell surrounding the earth with its longest diameter in the tropics and its shortest in the polar regions, where it touches sea-level. From the extreme regions of the Arctic and Antarctic circles this cold shell swells upwards into a broad dome, from 15,000 to 18,000 ft. high over the tropics, truncating, as it rises, a number of peaks and mountain ranges whose upper portions like all regions above this thermal shell receive all their moisture in the form of snow. Since the temperature above the snow-line is below freezing point evaporation is very slight, and as the snow is solid it tends to accumulate in snow-fields, where the snow of one year is covered by that of the next, and these are wrapped over many deeper layers that have fallen in previous years. If these piles of snow were rigid and immovable they would increase in height until the whole field rose above the zone of ordinary atmospheric precipitation, and the polar ice-caps would add a load to these regions that would produce far-reaching results. The mountain regions also would rise some miles in height, and all their features would be buried in domes of snow some miles in thickness. When, however, there is sufficient weight the mass yields to pressure and flows outwards and downwards. Thus a balance of weight and height is established, and the ice-field is disintegrated principally at the edges, the surplus in polar regions being carried off in the form of icebergs, and in mountain regions by streams that flow from the melting ends of the glaciers."

- Glacier

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"Our villa, perhaps, you never have seen; It lies on the slope of the Alban hill; Lifting its white face, sunny and still, Out of the olives’ pale gray green, That, far away as the eye can go, Stretch up behind it, row upon row. There, in the garden, the cypresses, stirred By the sifting winds, half musing talk, And the cool, fresh, constant voice is heard Of the fountains spilling in every walk. There stately the oleanders grow, And one long gray wall is aglow With golden oranges burning between Their dark stiff leaves of sombre green, And there are hedges all clipped and square, As carven from blocks of malachite, Where fountains keep spinning their threads of light, And statues whiten the shadow there. And, if the sun too fiercely shine, And one would creep from its noonday glare, There are galleries dark, where ilexes twine Their branchy roofs above the head. Or when at twilight the heats decline, If one but cross the terraces, And lean o’er the marble balustrade, Between the vases whose aloes high Show their sharp pike-heads against the sky, What a sight—Madonna mia—he sees! There stretches our great campagna beneath, And seems to breathe a rosy breath Of light and mist, as in peace it sleeps,— And summery thunder-clouds of rain, With their slanting spears, rim over the plain, And rush at the ruins, or, routed, fly To the mountains that lift their barriers high, And stand with their purple pits of shades Split by the sharp-edged limestone blades, With opaline lights and tender grades Of color, that flicker and swoon and die, Built up like a wall against the sky."

- Alban Hills

0 likesGeography of ItalyGeology