North American Mesozoic and Cænozoic Geology and Palæontology; Or, An Abridged History of Our Knowledge of the Triassic, Jurassic, Cretaceous and Tertiary Formations of this ContinentJ. Barclay, 1881 - 338 síður |
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North American Mesozoic and Cænozoic Geology and Palæontology: An Abridged ... Samuel Almond Miller Engin sýnishorn í boði - 2017 |
North American Mesozoic and Caenozoic Geology and Palaeontology: Or, an ... S. A. Miller Engin sýnishorn í boði - 2017 |
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Acad Ammonites arenaceous basin beds bluffs bowlder clay Bridger Group calcareous Canon Cardium Carolina carolinensis cliffs coal coast color Colorado conglomerate consists containing creek Cretaceous Dakota Group deposits described drift east eastern elevation Eocene exposed feet in thickness Fork formation forms Fort Benton Fort Pierre fossils Fox Hills Group Fusus genera glaciers globigerina ooze granite Green river Green River Group greensand Hayden height Inoceramus Jersey Jour Jurassic lake land layers Lignitic limestone lower marine marls miles Miocene Mississippi Missouri mountains mouth nearly northern numerous O. C. Marsh occur Ostrea pebbles Pecten Pierre Group places Pliocene Post-pliocene Proc Prof red sandstone region ridge rocks sandstone shales shells shore side slope South Carolina species stone strata stratified striæ surface Tellina terraces Tertiary Triassic Turritella U. S. Geo Uinta mountains upper Utah valley White river Wyoming yellow
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Síða 37 - ... look and a brownish colour, and become more and more mixed with a fine amorphous red-brown powder, which increases steadily in proportion until the lime has almost entirely disappeared. This brown matter is in the finest possible state of subdivision, so fine that when, after sifting it to separate any organisms it might contain, we put it into jars to settle, it remained for days in suspension, giving the water very much the appearance and colour of chocolate.
Síða 83 - It was also discovered, by the different members of the Survey, at various points on the eastern face of the same range, as far south as New Idria, and, in the summer of 1866, by Mr. Gabb, in Mendocino county near Round Valley, the latter locality being the most northern point at which it is yet known.
Síða 126 - The Judith River beds have their equivalent along the eastern edge of the mountains below the Lignite or Fort Union group, and also in Wyoming, and are Cretaceous, although of a higher horizon than the coal-bearing strata of Coalville and Bear River, Utah. They form either the upper part of the Fox Hill group or a group called "Number Six.
Síða 38 - Mid-Atlantic swarms with pelagic mollusca; and in moderate depths, the shells of these are constantly mixed with the globigerina ooze, sometimes in number sufficient to make up a considerable portion of its bulk. It is clear that these shells must fall in equal numbers...
Síða 171 - Viewed in the distance, indeed, these rocky piles, in their endless succession, assume the appearance of massive, artificial structures, decked out with all the accessories of buttress and turret, arched doorway and clustered shaft, pinnacle, and finial, and tapering spire.
Síða 171 - From the uniform, monotonous, open prairie, the traveller suddenly descends one or two hundred feet, into a valley that looks as if it had sunk away from the surrounding world ; leaving standing, all over it, thousands of abrupt, irregular, prismatic, and columnar masses, frequently capped with irregular pyramids, and stretching up to a height of from one to two hundred feet, or more.
Síða 40 - An ordinary mixture of calcareous Foraminifera, with the shells of pteropods, forming a fair sample of Globigerina ooze from near St. Thomas, was carefully washed, and subjected by Mr. Buchanan to the action of weak acid ; and he found that there remained, after the carbonate of lime had been removed, about one per cent, of a reddish mud, consisting of silica, alumina, and the red oxide of iron. This experiment has been frequently repeated with different samples of Globigerina ooze, and always with...
Síða 171 - One might almost imagine oneself approaching some magnificent city of the dead, where the labour and the genius of forgotten nations had left behind them a multitude of monuments of art and skill. On descending from the heights, however, and proceeding to thread this vast labyrinth, and inspect, in detail, its deep, intricate recesses, the realities of the scene soon dissipate the delusions of the distance. The castellated forms which fancy had conjured up have vanished; and around one, on every...
Síða 312 - It is a terrace of a table-land, the ancient shore of a great body of water, that once filled the whole of the Red River Valley. On its summit it is quite level and extends so, for about five miles westward, to another terrace, the summit of which, I was told, is level with the great Buffalo Plains, that stretch away toward the Missouri, the hunting grounds of the Sioux and the Half-breed population of Red River.
Síða 39 - ... minute cylinders scattered over the field. The larger Foraminifera are attacked, and instead of being vividly white and delicately sculptured, they become brown and worn, and finally they break up, each according to its fashion ; the chamber-walls of Globigerina fall into wedgeshaped pieces, which quickly disappear, and a thick rough crust breaks away from the surface of Orbulina, leaving a thin inner sphere, at first beautifully transparent, but soon becoming opaque and crumbling away. "In the...