The American Geologist, Band 30Newton Horace Winchell Geological Publishing Company, 1902 Includes section "Review of recent geological literature." |
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Andere Ausgaben - Alle anzeigen
Häufige Begriffe und Wortgruppen
American anal side basal Bayou Manchac beds branches Carboniferous Coal Measures creek Cretaceous crevasses crinoid crystals delta deposits Devonian district drift earth earthquake englacial erosion eruption eskers evidence fact fauna feet fissures formation fossils genus Geological Survey geologist geology glacial gneisses granite gravel gypsum hight Ice age ice-sheet Iowa Iowan Jour Kansas lake land limestone loess lower Madrid Madrid earthquake Malaspina glacier mass material melting metasomatic meteorite miles mineral mining Mississippi Missouri moraines mountains mouth Natchez Nebraska northern observed occur Omphalina origin Paleozoic Permian phenomena Pils plain plates Polygyra portion posterior present probably Prof radianal region ridge river rock Sagenocrinus sand schists Science shales shells shocks Silurian skeleton southern species specimens subglacial streams superglacial streams surface theory thick tion tunnel U. S. Geol upper valley veins xenotime zone
Beliebte Passagen
Seite 81 - And they remark that the shocks were clearly distinguishable into two classes; those in which the motion was horizontal, and those in which it was perpendicular.
Seite 143 - The finer portion of the englacial drift, swept down from the icefields by the abundant waters of their melting and of rains, was spread on the lower lands and along valleys in front of the departing ice, as the loess of the Missouri, the Mississippi, and the Rhine.
Seite 82 - The earth was observed to roll in waves a few feet high, with visible depressions between. By and by these swells burst, throwing up large volumes of water, sand, and coal.
Seite 218 - For the moving of large masses of rock, the most powerful engines without doubt which nature employs are the glaciers, those lakes or rivers of ice which are formed in the highest valleys of the Alps, and other mountains of the first order. These great masses are in perpetual motion, undermined by the influx of heat from the earth, and impelled down the declivities on which they rest by their own enormous weight, together with that of the innumerable fragments of rock with which they are loaded.
Seite 104 - Spanish account of this expedition says, concerning the Mississippi, that the ships " entered a river which was found to be very large and very deep, at the mouth of which they say they found an extensive town, where they remained forty days and careened their vessels. The natives treated our men in a friendly manner, trading with them, and giving what they possessed. The Spaniards ascended a distance of six leagues up the river, and saw on its banks, right and left, forty villages.
Seite 216 - ... length of time through which most of these fossils must have continued to live, will be better understood when it is stated that nearly all of the species enumerated in this list from the lower Coal Measures of West Virginia, also occur even in the upper Coal Measure beds in Nebraska, referred by Profs. Marcou and Geinitz to the Permian or so-called Dyas. Indeed, the collections from these two widely separated localities and horizons, contain so many of the same species, that if shown to almost...
Seite 143 - STAGE. Depression of the ice-burdened areas mostly somewhat below their present heights, as shown by fossiliferous marine beds overlying the glacial drift up to 300 feet above the sea in Maine, 560 feet at Montreal, 300 to 400 feet from south to north in the basin of Lake Champlain, 300 to 500 feet south-west of Hudson and James bays, and similar or less altitudes on the coasts of British Columbia, the British Isles, Germany, Scandinavia and Spitzbergen.
Seite 140 - ... Europe, raised the glaciated areas to so high altitudes that they received snow throughout the year and became deeply ice-enveloped. Valleys and fjords show that this elevation was 1,000 to 4,000 feet above the present height. Rudely chipped stone implements and human bones in the plateau gravels of southern England, 90 feet and higher above the Thames, and the similar traces of man in high terraces of the Somme valley, attest his existence there before the maximum stages of the uplift and of...
Seite 140 - UPLIFT, affecting both North America and Europe, raised the glaciated areas to so high altitudes that they received snow throughout the year and became deeply ice-enveloped. Valleys and fjords show that this elevation was 1,000 to 4,000 feet above the present height. Rudely chipped stone implements and human bones in the plateau...
Seite 7 - ... was thinner, has melted down much below the level of that which was protected by the thicker deposit ; and so the debris is sliding down the sides as well as into the tunnel through the center. Thus three ridges approximately parallel are simultaneously forming — one in the middle of the tunnel and one on each side. When the ice has fully melted away, this debris will present all the complications of interlacing ridges, with numerous kettle-holes and knobs characterizing the kames ; and these...