AN INTRODUCTION TO GEOLOGYLongman, Rees, Orme, Brown, Green & Longman, 1833 - 589 páginas |
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Página xxiii
... Craters of Eruption . - Craters of Elevation . - Theory of Von Buch con- firmed by analogous Geological Facts . Eruptions of Mud and Water from Volcanoes . Groups of Volcanic Islands . Fall and Extinction of a Volcano . Vast Extent of ...
... Craters of Eruption . - Craters of Elevation . - Theory of Von Buch con- firmed by analogous Geological Facts . Eruptions of Mud and Water from Volcanoes . Groups of Volcanic Islands . Fall and Extinction of a Volcano . Vast Extent of ...
Página 57
... observed by the author on the side of the volcanic mountain called Grave- naire , in Auvergne , at a small distance from the crater . The Globular structure consists of globular masses , either detached EXTERNAL STRUCTURE OF ROCKS . 57.
... observed by the author on the side of the volcanic mountain called Grave- naire , in Auvergne , at a small distance from the crater . The Globular structure consists of globular masses , either detached EXTERNAL STRUCTURE OF ROCKS . 57.
Página 109
... lagoon or lake within , which is shallow , and supposed to fill the Some species of coral were brought up by soundings , from the depth of one hundred fathoms or more . crater of a submarine volcano . Though the beds of CORAL ISLANDS . 109.
... lagoon or lake within , which is shallow , and supposed to fill the Some species of coral were brought up by soundings , from the depth of one hundred fathoms or more . crater of a submarine volcano . Though the beds of CORAL ISLANDS . 109.
Página 110
Robert Bakewell. crater of a submarine volcano . Though the beds of coral that form islands are not of the vast thick- ness which had been supposed , yet they rival , in extent and magnitude , some of the large calcareous formations of ...
Robert Bakewell. crater of a submarine volcano . Though the beds of coral that form islands are not of the vast thick- ness which had been supposed , yet they rival , in extent and magnitude , some of the large calcareous formations of ...
Página 185
... Craters . High Stile , Cumberland ; Cader Idris , Monmouthshire . - Basaltic Dykes : Extent of the Cleveland Basalt Dyke . Isolated Caps of Ba- salt . - On interstratified Basalt . Řemarks of Professor Sedg- wick on the Protrusion of ...
... Craters . High Stile , Cumberland ; Cader Idris , Monmouthshire . - Basaltic Dykes : Extent of the Cleveland Basalt Dyke . Isolated Caps of Ba- salt . - On interstratified Basalt . Řemarks of Professor Sedg- wick on the Protrusion of ...
Outras edições - Ver tudo
An Introduction to Geology: Intended to Convey a Practical Knowledge of the ... Robert Bakewell Pré-visualização indisponível - 2018 |
An Introduction to Geology: Intended to Convey a Practical Knowledge of the ... Robert Bakewell Pré-visualização indisponível - 2015 |
Palavras e frases frequentes
Alps ancient animals appear ation basalt bed of coal beds of limestone bones calcareous called caverns chalk Chap Charnwood Forest clay coal strata coal-field colour composed contain covered crater crystalline deposited Derbyshire distance districts dyke earth earthquakes elevation England epoch eruptions extend feet felspar fissures fossil fragments frequently freshwater geological geologists globe gneiss granite green sand greywacke gypsum hills hornblende intermixed ironstone island lakes lava lias lime London clay magnesian limestone marine marl mass mastodon metallic mica mica-slate miles mineral mountain limestone nearly numerous observed occur ocean oolite organic remains Paris basin Plate porphyry present primary rocks quadrupeds quartz range recent red marl red sandstone rivers rock-salt secondary strata serpentine shale shells side sienite situations sometimes species stone stratum subterranean surface tains temperature tertiary strata thermal waters thickness tion toadstone trachyte transition limestone transition rocks trap rocks upper valleys vegetable veins volcanic Wealden
Passagens conhecidas
Página 252 - Soon after the explosion commenced a number of meteorites fell to the ground over an area a mile and a half in length and half a mile in breadth. The following masses have been collected : — 1.
Página 367 - Stromboli, though at sixty miles distance, belching forth flames in an unusual manner, and with a noise which I could distinctly hear. But my attention was quickly turned from more remote to contiguous danger.
Página 389 - ... began to give way, and the greatest part of it actually fell in and disappeared in the earth. At the same time a tremendous noise was heard, resembling the discharge of the heaviest cannon. Immense quantities of volcanic substances, which were thrown out at the same time and spread in every direction, propagated the effects of the explosion through the space of many miles.
Página 192 - MP the mountain which is here composed of clinkstone, presents the columnar structure on a magnificent scale ; the columns are slightly bent and inclined. Porphyry, from an intermixture with hornblende frequently passes into sienite ; when this is the case, the latter rock generally forms the upper part of the mass. Porphyry and basalt, in enormous masses, often cover the primary mountains in the Andes. According to Humboldt, " they are arranged in regular columns, which strike the eye of the traveller...
Página 388 - Haec loca vi quondam et vasta convulsa ruina (tantum aevi longinqua valet mutare vetustas) 415 dissiluisse ferunt, cum protinus utraque tellus una foret: venit medio vi pontus et undis Hesperium Siculo latus abscidit, arvaque et urbes litore diductas angusto interluit aestu.
Página 376 - The sky was overcast at noonday with clouds of ashes ; the sun was enveloped in an atmosphere whose ' palpable ' density he was unable to penetrate ; showers of ashes covered the houses, the streets, and the fields, to the depth of several inches ; and amid this darkness explosions were heard at intervals, like the report of artillery, or the noise of distant thunder.
Página 381 - Submarine volcanoes are preceded by a violent boiling and agitation of the water, and by the discharge of volumes of gas and vapour, which take fire and roll in sheets of flame over the surface of the waves. Masses of rock are darted through the water with great violence, and accumulate till they form new islands. Sometimes the crater of the volcano rises out of the sea during an eruption. In 1783, a submarine volcano broke out near Iceland, which formed a new island ; it raged with great fury for...
Página 389 - Immense quantities of volcanic substances, which were thrown out at the same time and spread in every direction, propagated the effects of the explosion through the space of many miles. " It is estimated that an extent of ground, of the mountain itself and its immediate environs, fifteen miles long and full six broad, was by this commotion swallowed up in the bowels of the earth.
Página 314 - In viewing the position of the falls, and the features of the country round, it is impossible not to be impressed with the idea that this great natural raceway has been formed by the continued action of the irresistible Niagara, and that the falls, beginning at Lewiston have, in the course of ages, worn back the rocky strata to their present site.
Página 203 - ... which frequently form isolated caps on detached mountains. The cap of gritstone on Whin Hill, near Castleton, see Plate 4, affords an illustration of this ; and nothing is more common than to see the same bed of limestone, forming the uppermost stratum or cap of the mountains on each side of a valley. The occurrence of thick beds of basalt, divided into regular pentagonal or hexagonal columns, and disposed in ranges of vast extent and height, could not fail to arrest the attention of the most...