Memoirs of the Geological Survey of England and Wales. ...H.M. Stationery Office, 1846 |
Autres éditions - Tout afficher
Memoirs of the Geological Survey of England and Wales. ..., Volume 3 Geological Survey of Great Britain Affichage du livre entier - 1881 |
Memoirs of the Geological Survey of England and Wales. ..., Volume 2,Partie 2 Geological Survey of Great Britain Affichage du livre entier - 1848 |
Memoirs of the Geological Survey of England and Wales. ... Geological Survey of Great Britain Affichage du livre entier - 1846 |
Expressions et termes fréquents
abundant accumulations animals appear Arenaceous shale argillaceous limestone Argillaceous shale Argillo-arenaceous shale beneath Black Bramerton Bristol Britain British Seas Brown Builth calcareous calcareous matter carbonaceous Carbonaceous shale carbonate carbonic acid carboniferous limestone Celtic coal beds coal measures coast conglomerate contortions copper Coralline crag corals Cornwall denudation deposits detrital Devonian district dolomitic drift European Seas fauna feet flora formed fossil fossiliferous Fusus granite gravel gray argillaceous gray limestone gray sandstone Huel igneous igneous rocks Ireland ironstone land lias lime Linnæus lower mammaliferous crag marine mass Mendip Hills mines molluscs Monmouthshire nodules of ironstone northern observed old red sandstone older rocks organic remains pebbles Pembrokeshire peroxide of iron Petherwin plants portion quartz red crag Red marl sand Seam Second Series sheet Silurian Silurian rocks slates South Devon South Wales species Stigmaria strata thickness thin beds trappean Underclay upper Vein
Fréquemment cités
Page 376 - The archipelago is a little world within itself, or rather a satellite attached to America, whence it has derived a few stray colonists, and has received the general character of its indigenous productions.
Page 430 - ... the electricity which decomposes, and that which is evolved by the decomposition of, a certain quantity of matter, are alike.
Page 324 - Forbes has clearly proved that " the specific identity, to any extent, of the flora and fauna of one area, with those of another, depends on both areas forming, or having formed, part of the same specific centre, or on their having derived their animal and vegetable population by transmission, through migration, over continuous or closely contiguous land, aided, in the case of alpine floras, by transportation on floating masses of ice.
Page 373 - British islands and seas, have originated, so far as that area is concerned, since the meiocene epoch. 2. The assemblages of animals and plants composing that fauna and flora, did not appear in the area they now inhabit simultaneously, but at several distinct points in time. 3. Both the fauna and flora of the British islands and seas are composed partly of species which, either...
Page 376 - The natural history of these islands is eminently curious, and well deserves attention. Most of the organic productions are aboriginal creations, found nowhere else; there is even a difference between the inhabitants of the different islands; yet all show a marked relationship with those of America, though separated from that continent by an open space ofj ocean, between 500 and 600 miles in width.
Page 352 - ... marine shells is well worthy of notice as a geological fact. Cape Cod, the right arm of the Commonwealth, reaches out into the ocean, some fifty or sixty miles. It is nowhere many miles wide ; but this narrow point of land has hitherto proved a barrier to the migrations of many species of Mollusca. Several genera and numerous species, which are separated by the intervention of only a few miles of land, are effectually prevented from mingling by the Cape, and do not pass from one side to the other....
Page 126 - Address delivered at the Anniversary Meeting of the Geological Society of London on the 20th of February, 1857.
Page 453 - The majority of the workings, extending to a considerable depth for some acres over the side of the hill, are open to the day, or worked, as usual in the early days of mining, like a quarry; and the rock through which the lodes run, a portion of the lower Silurian rocks, is in many cases exposed, and exhibits beds much contorted and broken, though having a general tendency to dip northward.
Page 301 - ... latter more rapidly to overcome obstacles to further encroachments, created by itself in the shape of beaches. By further gradually increasing the depth of the surrounding water, ample space would also be afforded for the outspreading of the denuded matter. To such combined forces, namely, the shaving away of coasts by the sea, and the spreading abroad of the material thus obtained, the great plain of shallow soundings which generally surrounds our islands is in all probability attributable (a,...
Page 99 - ... always increases from below upwards : 2nd, that the progression is very different in each order and in each family, and that this progression is even frequently inverse, either in the different orders of the same class, or in the various genera of the same order. If, on the other hand, the development of the...