The Canadian Naturalist and Geologist, Volumen6Dawson., 1861 |
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Página 17
... direction . In this manner he pro- ceeds till he digs to where the fox is , who is generally killed in one of the side galleries , or close to one of the closed entrances . This method of killing a fox entails a large amount of labour ...
... direction . In this manner he pro- ceeds till he digs to where the fox is , who is generally killed in one of the side galleries , or close to one of the closed entrances . This method of killing a fox entails a large amount of labour ...
Página 52
... direction of N. E. to S. W. , from the promontory of Gaspé upon the Gulf of St. Lawrence to Alabama , where the terminal chains sink down and are lost in the recent and almost horizontal strata of the cretaceous and tertiary formations ...
... direction of N. E. to S. W. , from the promontory of Gaspé upon the Gulf of St. Lawrence to Alabama , where the terminal chains sink down and are lost in the recent and almost horizontal strata of the cretaceous and tertiary formations ...
Página 54
... direction of which is nearly straight or forming a gentle curve concave towards the northwest . These three divisions , diminishing in extent , from the north to the south , are well marked ; at the north , by the deep valleys of the ...
... direction of which is nearly straight or forming a gentle curve concave towards the northwest . These three divisions , diminishing in extent , from the north to the south , are well marked ; at the north , by the deep valleys of the ...
Página 55
... direction of the principal parts of the system is also somewhat changed . The main chain which borders the Great Valley on the east , and which more to the north , under the name of the Blue Ridge , separates it from the Atlantic plain ...
... direction of the principal parts of the system is also somewhat changed . The main chain which borders the Great Valley on the east , and which more to the north , under the name of the Blue Ridge , separates it from the Atlantic plain ...
Página 56
... direction of the water courses , attains here its greatest elevation , and descends gradually towards the north- west . The base of the interior chain which runs alongside the Great Valley is , thus depressed to a lower level , and ...
... direction of the water courses , attains here its greatest elevation , and descends gradually towards the north- west . The base of the interior chain which runs alongside the Great Valley is , thus depressed to a lower level , and ...
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Términos y frases comunes
Abundant America animal appear Barrande beds birds brown Calciferous Canada Canadensis Canadian Naturalist Carboniferous character coal coast colour common contain crystalline Dawson deposits Devonian discoveries district eggs Fabr feet formation Fort Simpson fossils fresh water Gaspé genera genus Geological Survey geologists gneiss gold graptolites grey hairs Hamilton's Farm inches Incisors Indian Island Lake Huron Lake Superior land Laurentian limestone lines Linn Logan Lower Canada Lower Silurian miles mineral molars Montreal mountains Natural History Society nearly Nova Scotia observed occur Olenus paleozoic places plants Potsdam present probably Prof quartz Quebec Quebec group region remarkable River rocks rocky Rouge sand sandstone second fauna seen shales shells shore side Sir William Logan slates species specimens stereoscope strata surface Taconic tail Tangier thick tion trilobites upper valley veins woods
Pasajes populares
Página 390 - Just previous to this time, in the Report of the Regents of the University of New York, for 1859, Professor Hall had described and figured by the name of Olenus two species of trilobites from the slates of Georgia, Vermont, which Emmons had wrongly referred to the genus Paradoxides. They were at once recognized by Barrande, who called attention to their primordial character, and thus...
Página 93 - ... like those of the Appalachian range. In truth, Mr. Hall observes, the carboniferous limestone is one of the most extensive marine formations of the continent, and is characterized over a much greater area by its marine fauna than by its terrestrial vegetation. " The accumulations of the coal period were the last that gave form and contour to the eastern side of our continent, from the Gulf of St. Lawrence to the Gulf of Mexico ; and as we have shown that the great sedimentary deposits of successive...
Página 211 - On the final causes of the sexuality of plants, with particular reference to Mr. Darwin's work on the Origin of Species.
Página 277 - On further scrutiny, with the aid of an opera-glass, two sharply cut and very narrow dark channels, bounding the principal ray, could be traced for ten or fifteen degrees from the nucleus ; while outside of them, on either side, were two additional faint rays. The whole issue of nebulous matter, from the nucleus far into the tail, was curiously grooved and striated. It was noticed that both the principal ray and the dark channels penetrated within the outline of the curved tail, the latter being...
Página 240 - ... animals ; the latter is not surprising when we consider that a considerable portion of the tissues of the lower marine animals is destitute of nitrogen, and very similar in chemical composition to the woody fibre of plants.
Página 88 - Sterry Hunt thus expresses himself: — ' We regard the whole Quebec group, with its underlying primordial shales, as the greatly developed representative of the Potsdam and Calciferous groups (with part of that of Chazy), and the true base of the Silurian system.' ' The Quebec group with its underlying shales,' this author adds (and he expresses the opinion of Sir W.
Página 332 - as many as two hundred of these concretions, varying in size from that of a small pea to that of a hazel-nut, to be passed after the administration of a single dose of Podophyllin and the Oil.
Página 404 - zone primordiale" of Bohemia — having no representative in the north-western Highlands, there is necessarily a complete unconformity between the fossil-bearing crystalline limestone and quartz-rocks with the Maclurea, Murchisonia, Orphile'ta, Orthis, Orthoceratites, etc., and those Cambrian rocks on which they rest. A great revolution in the ideas of many an old geologist, including myself, has thus been effected. Strengthened and confirmed as my view has been by the concordant testimony of Ramsay,...
Página 98 - ... beds will be the production within the greater synclinal of numerous smaller synclinal and anticlinal axes, which must gradually decline toward the margin of the great synclinal axis. This process the author observes appears to furnish a satisfactory explanation of the difference of slope on the two sides of the Appalachian anticlinals, where the dips on one side are uniformly steeper than on the other, p. 71. An important question here arises, which is this; — while admitting with Lyell and...
Página 92 - The metals of the sedimentary rocks are now however for the greater part in the form of insoluble sulphurets, so that we have only traces of them in a few mineral springs, which serve to show the agencies once at work in the sediments and waters of the earth's crust.