The Evolution of Earth Structure with a Theory of Geomorphic Changes: By T. Mellard ReadeLongmans, Green, and Company, 1903 - 342 Seiten |
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Amazons anticlinal Ardennes Azores basin beds carbonate Carboniferous changes CHAPTER Chemical Denudation chlorite clay cleavage Clonakilty coast compression compressor continents contour County Cork Cretaceous cubic deep deposits depression depth developed differential dome domical earth's crust elevation evidence exist expansion Experiment fact fathoms faults feet fissile fold geological geologists globe grains Gulf of Mexico inches islands Isostacy Israel Russell land areas lateral pressure layers lithosphere mass material matter mica mineral Mississippi Mountain Ranges movements nature North America Origin of Mountain parallel photograph Phyllades plane Plate Pleistocene portion quarry raised beaches result ridges rise river rocks sand sandstones screwing sea-level sediment sedimentary shearing sheet shown sink slaty-cleavage solid soundings South specific gravity spheroid spiral square miles strata strata-plate structure sub-aërial submarine submerged subsidence surface take place temperature terraces Tertiary theory thickness tion valleys vertical volcanic volume
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Seite 267 - Amazon the turbid flow of the mighty stream overpowers all tides, and produces a constant downward current. The color of the water is different ; that of the Para being of a dingy orangebrown, while the Amazon has an ochreous or yellowish-clay tint.
Seite 218 - They appear to me only resolvable, on the supposition that crystalline or polar forces acted on the whole mass simultaneously, in given directions, and with adequate power.
Seite 226 - ... qualities as slate. We have, we hope, clearly shown that real slaty-cleavage is always accompanied by mineral changes in the body of the rock, which not only give to the rock its foliaceous character, but supply the necessary cement to bind together the heterogeneous overlapping constituent grains and convert what was originally mud into a rock possessing the tenacious and economically useful properties of slate.
Seite 19 - Austen has placed pieces of gold and lead in contact at a temperature of 18° C. After four years the gold had travelled into the lead to such an extent that not only were the two metals united, but, on analysis, appreciable quantities of the gold were detected even...
Seite 18 - Matter in bulk appears to be continuous. Such substances as water or air appear to the ordinary observer to be perfectly uniform in all their properties and qualities, in all their parts. The hasty conclusion that these bodies are really uniform is, nevertheless, unthinkable. In the first place the phenomena of diffusion afford conclusive proof that matter when apparently quiescent is in fact in a state of internal commotion. I need not recapitulate the familiar evidence to prove that gases and many...
Seite 261 - ... greater discharge of the La Plata would more than compensate for the smaller percentage of dissolved matter in its waters, and bring the chemical denudation per square mile of river basin up to or beyond that of the Mississippi. The observations of Mr. Bateman were taken in the month of December, 1870, when the river was at its lowest state. "A continuous drought of six or seven months having diminished the ordinary sources of supply, and the periodical rise from the Andes not having commenced.
Seite 291 - At 500 fathoms the wire was ground like the edge of a razor, and we had to abandon it and lay a cable well inshore. Captain Nares, of the surveying ship
Seite 259 - If we take the drainage area of the Mississippi proper at 1,244,000 square miles, the calculated amount of solids in solution, according to the analysis, will be 120 tons removed from each square mile of surface per annum. From the surface of England and Wales I have shown that 143'5 tons per annum are removed in solution,* and from the Danube basin 90 tons, so this is a mean, and probably correct.
Seite 257 - My former calculations dealt almost exclusively with the amount of matter annually removed in river water from the surface of England and Wales, and from some of the river basins of Europe. I now propose laying before you calculations of a similar nature relating to some of the larger rivers of the two Americas. This done we shall be able to take a wider survey of the subject, and to ascertain how far the provisional generalizations to which previous investigations led are confirmed or otherwise...
Seite 80 - If we find hard ground we know that there must be something to prevent the accumulation of sediment. Now the only thing that prevents...