The Geology of England and Wales: A Concise Account of the Lithological Characters, Leading Fossils, and Economic Products of the Rocks; with Notes on the Physical Features of the Country

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Longmans, Green and Company, 1876 - 476 Seiten
 

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Seite 454 - FREDERICK M°CoY, FGS One vol., Royal 410. Plates, /i. is. A CATALOGUE OF THE COLLECTION OF CAMBRIAN AND SILURIAN FOSSILS contained in the Geological Museum of the University of Cambridge, by JW SALTER, FGS With a Portrait of PROFESSOR SEDGWICK.
Seite 433 - The variation of species, and natural selection or the survival of the fittest in the struggle for existence, are Natural History facts, and the consideration of these facts as brought prominently into notice by Darwin, has led to the doctrine of the Evolution of Life being regarded as the " Fundamental Truth of Biology." When, therefore, we hear the subject treated...
Seite 386 - Conein-coue,' as the seam of ironstone breaks into conical forms with the bases of the cones at top and bottom of the seam, and their apices pointing inwards towards each other. The surfaces of these cones are corrugated by small horizontal fretted wavelets, or ridges, rather resembling those on the outside of some stalactites, and each cone is concentrically enveloped by several coats, the surface of each being similarly corrugated.
Seite 365 - ... in a horizontal or nearly horizontal direction, following the sweep of the hillside whether curved or straight. The boundary line between these several strips may have been originally only a mathematical one, connecting, say, two mere-stones, and yet a bank will soon have been formed along it. For each upper cultivator will naturally have taken care not to allow the soil of his strip to descend to fertilize his neighbour's below. He would draw the lower limit of his strip by a reversed furrow,...
Seite 117 - The boundary between them may be roughly marked off by a line running from the mouth of the Tees to the mouth of the Exe.
Seite 302 - Upward of 200,000 years ago the earth — as we know from the calculations of astronomers — was so placed in regard to the sun that a series of physical changes was induced which eventually resulted in conferring upon our hemisphere a most intensely severe climate. All northern Europe and northern America disappeared beneath a thick crust of ice and snow, and the glaciers of such regions as Switzerland assumed gigantic proportions.
Seite 21 - Now does this mean that it may have been two, or three, or four hundred million years ? Because this really makes all the difference.
Seite 286 - ... extending from the river Aide on the north, to the southern extremity of the deposit in Essex. Of these four stages, the 4th is the most constant and important, the 1st, 2nd, and 3rd being frequently either concealed by, or destroyed during the formation of, the succeeding stages. At Walton-on-the-Naze alone do any of the four lower stages contain evidence of being a subaqueous deposit; there the 1st stage is so, but it is covered by two reef stages, and these again by the 5th stage. The 5th...
Seite 385 - ... lead, and many others ; a slight trace of copper in the Bath waters being exceptional. Nevertheless, there is a strong presumption that there exists some relationship between the action of thermal waters and the filling of rents with metallic ores. The component elements of these ores may, in the first instance, rise from great depths in a state of sublimation or of solution in intensely heated water, and may then be precipitated on the walls of a fissure as soon as the ascending vapors or fluids...
Seite 13 - formation," which I have used in the above explanation, expresses in geology any assemblage of rocks which have some character in common, whether of origin, age, or composition.

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