The Geological ObserverBlanchard and Lea, 1851 - 695 pagina's |
Inhoudsopgave
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Overige edities - Alles bekijken
Veelvoorkomende woorden en zinsdelen
accumulations acid adjoining amid appear atmosphere beach beds beneath bottom breaker action British Islands calcareous carbonate carbonic acid cavities changes clay cliffs coal coast considerable considered coral reefs covered deposits depth detritus distribution district dry land earthquake effected elevation Elie de Beaumont eruptions evidence exposed fathoms feet felspar fissures formed fragments geological glaciers granite hornblende igneous products igneous rocks inferred kind lagoon lakes lava layers lime limestone magnesia manner mass mechanical suspension miles mineral matter mingled mode of occurrence modifications molluscs molten mountain noticed observer occur ocean old red sandstone oolite organic remains pebbles portions present produced quartz red sandstone regards regions respect rise river sand sea-bottom section fig seen shells shores side silica Silurian Sir James Ross sometimes species specific gravity streams submergence substances sufficient surface temperature thrown tidal tide tion trachyte traversed various vegetable veins Victoria Land volcanic
Populaire passages
Pagina 10 - A new edition, with numerous illustrations ; together with a General History of the Horse ; a Dissertation on the American Trotting Horse; how trained and jockeyed; an Account of his Remarkable Performances; and an Essay on the Ass and the Mule.
Pagina 697 - First American edition, with a Glossary and other Additions and Improvements; from the second English edition. Translated from the sixth German edition, by HENRY MEDLOCK, FCS, &c.
Pagina 223 - A GLACIER is AN IMPERFECT FLUID, OR A VISCOUS BODY. WHICH IS URGED DOWN SLOPES OF A CERTAIN INCLINATION BY THE MUTUAL PRESSURE OF ITS PARTS.
Pagina 45 - That there is no notable difference in sea-water under different meridians. 4. That there is no satisfactory evidence that the sea at great depths is more salt than at the surface. 5. That the sea, in general, contains more salt where it is deepest and most remote from land ; and that its saltness is always diminished in the vicinity of large masses of ice. 6. That small inland seas, though communicating with the ocean, are much less salt than the ocean.
Pagina 331 - The sides of the gulf before us, although composed of different strata of ancient lava, were perpendicular for about four hundred feet, and rose from a wide horizontal ledge of solid black lava of irregular breadth, but extending completely round. Beneath this ledge the sides sloped gradually towards the burning lake, which was, as nearly as we could judge, three or four hundred feet lower. It was evident that the large crater had been recently filled with liquid lava up to this black ledge...
Pagina 288 - Elephant prefers, will not enable us to determine, or even to offer a probable conjecture concerning that of the extinct species." The molar teeth of the Elephant possess, as we have seen, a highly complicated, and a very peculiar structure, and there are no other quadrupeds that derive so great a proportion of their food from the woody fibre of the branches of trees. Many mammals browse the leaves ; some small rodents gnaw the bark ; the Elephants alone tear down and crunch the branches, the vertical...
Pagina 339 - The stream may be seen on the eastern slope of the mountain near Giarre, extending over a breadth of more than two miles, and having a length of twenty-four from the summit of the mountain to its final termination in the sea. The spot in question is called the Bosco di Aci ; it contains many large trees, and has a partial coating of vegetable mould, and it is seen that this torrent covered lavas of an older date which existed on the spot.
Pagina 96 - ... coast of England and in the Channel, and that a northwest wind of any continuance causes the Baltic to rise two feet and upwards above its ordinary level. Smeaton ascertained by experiment, that in a canal four miles in length, the water was kept up four inches higher at one end than at the other merely by the action of the wind along the canal ; and...
Pagina 294 - Grand indeed,' says an English naturalist, 'was the fauna of the British islands in those early days. Tigers as large again as the biggest Asiatic species lurked in the ancient thickets; elephants of nearly twice the bulk of the largest individuals that now exist in Africa or Ceylon roamed...
Pagina 143 - ... part being covered with the falling matter: it had the appearance of calcined pumice-stone, nearly the colour of wood ashes ; it lay in heaps of a foot in depth...