The Journal of Geology, Band 5University of Chicago Press, 1897 Vols. for 1893-1923 includes section: "Reviews." |
Inhalt
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| 837 | |
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| 862 | |
Andere Ausgaben - Alle anzeigen
Häufige Begriffe und Wortgruppen
abundant acid andesites augite Baltic basalts basin bauxite beaches beds belt biotite bowlder clay Bull Canyon Carboniferous ciminites coast Comanche series Cretaceous débris deposits described Devonian dikes drift east elevation epoch eruptive evidence fault fauna feet feldspar formation fossils Fusulina Gabb Geological Survey geologists glacial glacier gneiss granite Greenland groundmass Hill ice-front ice-sheet igneous Jour Jurassic Lake layers leucite limestone loess lower magma mass miles mineral Mountain movement observed occur olivine orthoclase oscillation paper period phenocrysts plagioclase porphyritic porphyritic granite portion Potomac present probably Professor quarry quartz quartzite range region represented Rept retreat rhyolites ridge River rocks sand sandstone schists shales side Sierra silica slope southern species specimens stage strata structure surface Surv terminal moraines thickness tion topography trachytes U. S. Geol upper valley volcanic Waucobi zone
Beliebte Passagen
Seite 509 - All modifications and variations in progressive series tend to appear first in the adolescent or adult stages of growth, and then to be inherited at earlier and earlier stages according to the law of acceleration, until they either become embryonic or are crowded out of the organization, and replaced in the development by characters of later origin.
Seite 843 - To avoid this grave danger, the method of multiple working hypotheses is urged. It differs from the simple working hypothesis in that it distributes the effort and divides the affections.
Seite 518 - ... later stages of the shell. And by breaking off the outer chambers the naturalist can in effect cause the shell to repeat its life history in inverse order, for each stage of growth represents some extinct ancestral genus. These genera appeared...
Seite 843 - The investigator thus becomes the parent of a family of hypotheses; and by his parental relations to all is morally forbidden to fasten his affections unduly upon any one.
Seite 837 - It is not necessary to this habit of study that the subject-material should be new ; but the process of thought and its results must be individual and independent, not the mere following of previous lines of thought ending in predetermined results. The demonstration of a problem in Euclid precisely as laid down is an illustration...
Seite 509 - The acceleration in the assumption of a character, progressing more rapidly than the same in another character, must soon produce, in a type whose stages were once the exact parallel of a permanent lower form, the condition of inexact parallelism. As all the more comprehensive groups present this relation to each other, we are compelled to believe that acceleration has been the principle of their successive evolution during the long ages of geologic time. Each type has, however, its day of supremacy...
Seite 840 - The moment one has offered an original explanation for a phenomenon which seems satisfactory, that moment affection for his intellectual child springs into existence, and as the explanation grows into a definite theory his parental affections cluster about his offspring and it grows more and more dear to him.
Seite 567 - The scenery had assumed all the features of an old topography, with its gently flowing curves. . . . At the end of the Tertiary came the great lava streams running down the river channels and displacing the rivers ; the heaving up of the Sierra crust-block on its eastern side, forming the great fault-cliff there and transferring the crest to the extreme eastern margin ; the great increase of the western slope and the consequent rejuvenescence of the vital energy of the rivers ; the consequent down-cutting...
Seite 615 - A preliminary annotated check list of the Cretaceous invertebrate fossils of Texas accompanied by a short description of the lithology and stratigraphy of the system : Texas Geol.