Chemical Denudation in Relation to Geological Time

Cover
D. Bogue, 1879 - 61 Seiten
 

Ausgewählte Seiten

Andere Ausgaben - Alle anzeigen

Häufige Begriffe und Wortgruppen

Beliebte Passagen

Seite 24 - If we allot 50 tons to carbonate of lime, 20 tons to sulphate of lime, 7 to silica, 4 to carbonate of magnesia, 4 to sulphate of magnesia, 1 to peroxide of iron, 8 to chloride of sodium, and 6 to the alkaline carbonates and sulphates we shall...
Seite 39 - When there has been no reason to suppose that the trawl has sunk more than one or two inches in the clay, we have had in the bag over a hundred sharks' teeth, and between thirty and forty ear-bones of whales.
Seite 41 - ... to 12° S., along the shores of the Pacific. This is a distance, in a north and south line, of 2,075 geographical miles. From Byron's observations, the elevation has no doubt extended sixty miles...
Seite 34 - ... suppose that to be a fact; but in reality La Place has proved nothing of the sort, as those geological teachers who have echoed the conclusion should have known, had they deciphered the mathematical argument upon which it has been supposed to rest. By application of Fourier's theorem (or definition) to the observed rate of increment of heat in descending from the geothermal couche of invariable temperature, and the co-efficients of conductivity of the rocks of our earth's crust, as given by the...
Seite 39 - Eadiolarian, and Diatom oozes we have found during the whole cruise only one or two shark's teeth and perhaps one tympanic bone. In shore-deposits they were even more rare. These facts, taken with others that will at once suggest themselves, go to show, as might be expected, that the shore-deposits accumulate faster than the organic oozes, and these last faster than the deep-sea clay. The organisms in our Eadiolarian ooze appear to resemble very closely and in their relative proportions those described...
Seite 55 - ... the harbour accommodation of Buenos Ayres, to ascertain the volume of these streams, and the quantity of matter which they carried in suspension. " For this purpose careful measurements have been made during the month of December, 1870. " The Parana was in its lowest state — a continuous drought of six or seven months having diminished the ordinary sources of supply, and the periodical rise resulting from the melting of the snows of the Andes not having yet commenced. This river is stated to...
Seite 26 - It is probable, also, that marine organisms can in some way directly utilise the sulphate of lime. Bischof shows very beautifully and clearly that the amount of carbonic acid in sea water is subject to very little variation, and that it is present in sufficient quantity to dissolve five times as much of the earthy carbonates as are actually dissolved, and "that the sea water is so far below its point of saturation as regards carbonate of lime, can only depend upon the constant separation of this...
Seite 56 - ... Admiralty by Captain Sulivan and others, I venture to calculate that it may approximately be rated at about 150,000 cubic feet per second in its lowest state, making the total minimum volume of water poured into the River Plate, if the condition of low water occur in both rivers at the same time, about 670,000 cubic feet per second — a quantity equal to the mean volume of thirty-three years passing down the Mississippi.
Seite 27 - Frankland so beautifully shews is constantly being carried into the air from the spray of every wave. What a lengthened vista does not this disclose ? We cannot see the beginning, all that is plain to us is the sequence, the circulation. The matter of the world is continually changing place — its solvent is the rain, its carrier the river, its receiver and distributor the ocean. How many times...

Bibliografische Informationen