The American Geologist: A Monthly Journal of Geology and Allied Sciences ..., Band 23Geological publishing Company, 1899 |
Inhalt
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Andere Ausgaben - Alle anzeigen
Häufige Begriffe und Wortgruppen
Acad acid Albany Amer American associated augite basin beds Brachiopoda Bryozoa Bull Cambrian Carboniferous chlorastrolite clay color Cretaceous crystals denudation deposits depth described Descriptions Devonian diabase diamonds dikes district drift Eocene erosion evidence Fauna feet formation Fossils Genera Genus Geological Survey geologists glacial glacier gneiss granite gravel Group Helderberg hight hill Hist Ibid ice-sheet Iowa James Hall Jour Kansas lake land limestone locality loess magma mass Memb miles mineral Miocene Missouri Missouri river Missourian moraine mountains Museum Note Observations occur origin oxides Palæontology Paleozoic pegmatyte peneplain Permian Philos plain plateau plates Plattsmouth present Proc Prof Professor quartz region relations Report Rept river rocks sandstone schists Science shales Silurian Species of Fossils specimens strata structure surface Tertiary thickness tion topographic Triassic U. S. Geol uplands uplift upper valley York
Beliebte Passagen
Seite 142 - I do not know what I may appear to the world, but to myself I seem to have been only like a boy playing on the sea-shore, and diverting myself in now and then finding a smoother pebble or a prettier shell than ordinary, whilst the great ocean of truth lay all undiscovered before me.
Seite 38 - On the Fishes Obtained by the Naturalist Expedition in Rio Grande do Sul. Proc. Amer.
Seite 29 - The Lemuroidea and the Insectivora of the Eocene Period of North America.
Seite 13 - Found in and Near the Same, and on Some Extinct Mammals of the Caves of Anguilla, WI, and of Other Localities.
Seite 8 - Retardation signifies a reduction of the number of such repetitions during the same time." associated the idea that the course of evolution was determined from the beginning of things and that "life is energy directed by sensibility or by a mechanism which has originated under the direction of sensibility.
Seite 216 - Alpine structure [form?] or scenery. There are n'o prominent peaks or cones. The ridges are even-topped for long distances and the average elevation is uniform over wide areas. Looking at the crests alone and imagining the valleys and depressions filled, the surface would approximate to a -plane gently inclined toward the southeast and toward the southwest
Seite 331 - C.) and Forsyth (A.). Notes on the geology and mineral deposits of a portion of the southern Black Hills, S.
Seite 206 - The degradation of the last few inches of a broad area of land above the level of the sea would require a longer time than all the thousands of feet which might have been above it, so far as this degradation depends on mechanical...
Seite 186 - ... make fragments of crystals. As the edges of the crystals are still sharp and unabraded, the locus of formation cannot have been very distant from the present sites. There were probably many sites of crystallisation differing in place and time, or we should not see such distinctive characters in the gems from different mines, nor indeed in the diamonds from different parts of the same mine.
Seite 225 - Grand canyon .... we may observe . . a few bosses of Silurian strata rising higher than the hard quartzitic sandstone which forms the base of the Carboniferous. These are Paleozoic hills, which were buried by the growing mass of sediment. But they are of insignificant mass, rarely exceeding two or three hundred feet in height