Chemical and Geological EssaysJ.R. Osgood, 1875 - 489 Seiten |
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Andere Ausgaben - Alle anzeigen
Häufige Begriffe und Wortgruppen
alkaline alumina American Journal apatite Bala base beds bicarbonate Bischof calcareous calcite Cambrian Canada carbonate of lime carbonate of soda carbonic acid carboniferous chemical chloride chloride of calcium chloride of sodium composition contain crust crystalline rocks crystalline schists crystals decomposition Delesse deposits described dolomite earthy Emmons evaporation fauna feet feldspar formation fossiliferous fossils Geol geological give rise gneiss granitic granitic veins gypsum heat hornblende hydrogen iron Jour Journal of Science Laurentian lime and magnesia limestones Lingula flags Llandeilo magnesia magnesium mass metamorphism mica mica-schists micaceous mineral Murchison Olenus organic matters origin orthoclase oxide paleozoic petroleum portion Potsdam present Professor pseudomorphism pyroschists pyroxene quartz region saline waters salts sand-rock sandstone schists sea-water Sedgwick sedimentary sediments serpentine shales silicates Silurian similar slates soluble solution species springs strata sulphate of lime sulphate of magnesia sulphide sulphur sulphuretted supposed Taconic temperature tion tourmaline Upper Cambrian vein-stones volcanic
Beliebte Passagen
Seite 241 - Hudson, the Green Mountains of Vermont, and the White Mountains of New Hampshire.
Seite 403 - Logan attempted a new explanation of the stratigraphy of the region; declaring at the same time, that "from the physical structure alone no person would suspect the break which must exist in the neighborhood of Quebec ; and without the evidence of the fossils every one would be authorized to deny it." [Ibid, page 218.] The typical Potsdam sandstone of the New York system, as seen in the Ottawa basin in northern New York and the adjacent parts of Canada, affords but a very meagre fauna, including...
Seite 71 - ... the effects of heat and water upon the buried sediments would bo condensation, from the diminution of porosity and still more from the conversion of the earthy materials into crystalline species of higher specific gravity, thus causing contraction of the mass. A further and very important result of this accumulation...
Seite 78 - As the solid crust sinks together to follow down after the shrinking nucleus, the work expended in mutual crushing and dislocation of its parts is transformed into heat, by which, at the places where the crushing sufficiently takes place, the material of the rock so crushed and of that adjacent to it are heated even to fusion. The access of water to such points determines volcanic eruption.
Seite 401 - Calciferous, and it is brought to the surface by an overturn anticlinal fold with a crack and a great dislocation running along the summit, by which the Quebec group is brought to overlap the Hudson River formation.
Seite 243 - ... series, and are intimately associated with beds of iron ore, generally a slaty hematite, but occasionally magnetite. Chrome, titanium, nickel, copper, antimony, and gold are frequently met with in this series. The gneisses often pass into schistose micaceous quartzites, and the argillites, which abound, frequently assume a soft, unctuous character, which has acquired for them the name of talcose or 6 ADDRESS OF EX-PRESIDENT HUNT.
Seite 47 - ... glass ; which keeps up the temperature beneath it, directly, by preventing the escape of radiant heat, and indirectly by hindering the condensation of the aqueous vapor in the air confined beneath. Now we have only to bear in mind that there are the best of reasons for believing that during the earlier geological periods, all of the carbon since deposited in the forms of limestone and of mineral coal existed in the atmosphere in the state of carbonic acid, and we see at once an agency which must...
Seite 60 - Hopkins, may be supposed still to retain its liquid condition, and to be the seat of volcanic action, whether existing in isolated reservoirs or subterranean lakes; or whether, as suggested by Scrope, forming a continuous sheet surrounding the solid nucleus, whose existence is thus conciliated with the evident facts of a flexible crust, and of liquid ignited matters beneath. Hopkins, in the discussion of this question, insisted upon the...
Seite 37 - ... application ; so that we may suppose that all the elements which make up the sun or our planet would, when so intensely heated as to be in...
Seite 456 - CmH110C12, which is the lowest one representing the tristearic glyceride (ordinary stearine), is probably far from representing the true equivalent weight of this fat in its liquid or solid state ; and if it should hereafter be found that its density corresponds to six times the above formula, it would follow that liquid acetic acid, whose density differs but slightly from that of fused stearine, must have a formula and an equivalent weight about one hundred times that which we deduce from the density...