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Abundant America animal appear base beds belong birds body brown Canada character Clear coast collected colour common containing covered deposits described direction district eggs elevation evidence existence extending fact Family fauna feet formation fossils genus Geological gives gold hairs Hall head History inches Indian interesting Island July known Lake land latter length less lignite limestone lines Linn localities lower marked miles Montreal mountains Natural nearly notice observed occur origin period places plants portion position present probably Prof Quebec regarded region remains remarkable River rocks round sand sandstone seen shales shells shore short side Silurian similar Sir William Logan slates Society species specimens strata Superior surface tail thick tion upper valley various whole woods
Sivu 392 - 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...
Sivu 97 - ... 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...
Sivu 199 - ... to furnish important collateral evidence in support of the reasoning founded on other sciences, such as philology and ethnology, which has long demanded, for the development of our race, a number of years far exceeding that which is allowed by the chronology previously received. It is the beautiful expression of Sir Thomas Browne, which I find quoted by Dr Mantell in a former paper on this subject, that " Time conferreth a dignity upon the most trifling thing that resisteth his power...
Sivu 242 - ... 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.
Sivu 92 - Hall, shown to be the natural base of the Silurian rocks in America, as Barrande and De Verneuil have proved it to be on the continent...
Sivu 334 - 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.
Sivu 95 - Quebec group is of considerable economic interest inasmuch as it is the great metalliferous formation of North America. To it belongs the gold which is found along the Appalachian chain from Canada to Georgia, together with lead, zinc, copper,, silver, cobalt, nickel, chrome and titanium. I have long since called attention to the constant association of the latter metals, particularly chrome and nickel, with the ophiolites and magnesian rocks of this series, while they are wanting in similar rocks...
Sivu 406 - 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,...
Sivu 104 - bottom strata to establish lines of weakness or of least resistance in the earth's crust, and thus determine the contraction which results from the cooling of the globe to exhibit itself in those regions, and along those lines where the ocean's bed is subsiding beneath the accumulated sediments...
Sivu 329 - Ocean, and divided into two slopes by a watershed that nearly follows the political boundaryline, and throws the drainage to the Gulf of Mexico and the Arctic Ocean. The northern part of this plateau has a slope, from the Rocky Mountains to the eastern or Laurentian axis, of six feet in the mile, but is broken by steppes, which exhibit lines of ancient denudation at three different levels ; the lowest is of freshwater origin ; the next belongs to the Driftdeposits, and the highest is the great Prairie-level...