A Selection of Facts from the Best Authorities: Arranged So as to Form an Outline of the Geology of England and Wales. With a Map and Sections of the StrataWilliam Phillips, 1818 - 240 páginas |
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A Selection of Facts from the Best Authorities: Arranged So as to Form an ... William Phillips Prévia não disponível - 2016 |
Termos e frases comuns
adit alluvium Alum bay appear argillaceous basalt beds of coal beds of limestone belong calcareous spar called chalk range characters chiefly clay-slate cliff clunch Coal formation Coal measures coal-field coast colour composed conglomerate considerable consists contains copper Cornwall cross vein crystals deposite depth Derbyshire dykes east and west encloses England fathoms feet thick felspar flints flucan fossils G. T. vol Geological Society gossan granite gravel green sand greenstone grey greywacké hills horizontal hornblende imbedded inches indurated interstratified Isle of Wight Lead measures lime load London clay magnesian limestone marle masses metalliferous veins miles miner mines mountain limestone nearly neighbourhood nodules north and south noticed numerous occasionally occurs old red sandstone oolite organic remains places plastic clay porphyritic pyrites Quantock hills quarries quartz red marle remarkable rock shale shells side slate slaty sometimes stone strata stratum substance surface termed toadstone tract trap vertical
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Página 205 - a grain of metal attracts the rod as strongly as a pound," for which reason "it has been found to dip equally to a poor as to a rich lode.
Página 110 - ... little to the south of Hartley, or about three miles north of Shields, and running westward crosses the Tyne at Lemington, about four miles west of Newcastle Bridge. In some places it is only a few inches wide, but in Montagu colliery it is 22 yards wide, and is filled with hard and soft sandstone. From the southern side of this dyke two others branch off, one to the south-east and the other to the south-west The latter, called from its breadth the 70-yard dyke, is also filled with hard and soft...
Página 116 - Coal-Field rests on transition rock: it extends from Wombridge, in the parallel of Wellington, to Coal Port, on the Severn, a length of about six miles ; its greatest breadth is about two miles. The coal-measures are composed of the usual alternating strata, which occur without much regularity, except that each bed of coal is always immediately covered by indurated or slaty clay, and not by sandstone. The strata are 86 in number.
Página 91 - The inequality of the surface does not affect the dip or inclination of the strata constituting the coal-measures ; so that when they are interrupted or cut off by the intervention of a. •valley, they will be found on the sides of the opposite hills at the same levels, as if the beds had once been continuous. The conclusion is obvious, that the present irregularities of hill and dale have been occasioned by the partial destruction or dispersion of the uppermost strata constituting the coal-formation.
Página 230 - Add to this, that several parts of the load which were richer than others, have been very indiscreetly hulked and worked within four feet of the sea ; whereby in violent stormy weather the noise overhead has been so tremendous that the workmen have many times deserted their labour, under the greatest fear lest the sea might break in upon them.* The account of Huel Cock above cited, is extracted from the Mineralogia Cornuhiensis of Pryce, page 21.
Página 147 - It consists for the most part of rather fine grains of quartz, with a few spangles of mica, cemented by clay and oxide of iron. Its colour is generally brownish red, and it has but little cohesion ; on which account large tracts of loose deep sand are found in many parts of it. Sometimes it occurs nearly of a cream colour, and is then sufficiently hard to form an excellent building stone : it does not effervesce with acids, and no shells or other organic remains have been found in it.