The American Journal of Science, Volum 48;Volum 198J.D. & E.S. Dana, 1919 |
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Altres edicions - Mostra-ho tot
Frases i termes més freqüents
åkermanite algæ anorthosite appear atom barite Barrell beds bowlders brachiopods cacoclasite calcite CaO.MgO.2SiO cent cleavage color composition CaO Compositions lying compound contains corals cristobalite crust crystals deflections density deposits depth determined diopside earth electrons evidence fauna feet field formation fossils geodetic Geol geological geologists given Glacial glass Glass+crystals Glasstrace granite gravity Grenville Hackberry hausmannite Hayford Hogshooter hypothesis igneous indicate inversion investigation islands isostasy Joseph Barrell Jour Journal laccolith limestone manganese mass Melt method miles minerals monticellite mountain Naticopsis observed ocean Ordovician original orthogenesis oxide paleontology paper phases present probably Professor psilomelane pyrochroite quartz reefs region relations represented residuals rhodochrosite rhombohedron rocks sand SCI.-FOURTH SERIES sea-level sediments shale silica SiO2 solid solutions species specimens structure Suess's surface temperature tephroite ternary system theory thickness tion tridymite vertical waves wollastonite wollastonite solid solution writer zone
Passatges populars
Pàgina 241 - Carlim, and it is for this reason, as well as on account of the fact that the fauna of the Rodman is neither more Stones River than Trenton in general appearance, that I prefer to place the Rodman at the top of the Stones River group.
Pàgina 10 - and has become in consequence much reduced, how can it be still further reduced in size until the merest vestige is left; and how can it be finally quite obliterated. It is scarcely possible that disuse can go
Pàgina 57 - ternary system lime-magnesia-silica has proved to be the most complicated of the four possible ternary systems which may be constructed from the four oxides, lime, magnesia, alumina, and silica. The crystalline phases which are definite compounds and which appear as primary phases are as follows: Lime; magnesia; silica (tridymite and cristobalite);
Pàgina 168 - exposed to air in times of drought,” and ‘ ‘ similar to the basin deposits of the western United States laid down in the Tertiary period between the growing ranges of the Cordillera. ‘ ‘ ‘ ‘ The Great Valley of California may therefore in the present epoch, both in
Pàgina 168 - ‘ Eureka. ‘ ‘ Truly we have here the correct explanation of the origin of the Old Red Sandstone. ‘ ‘ The central conclusion reached in this paper is that the Old Red Sandstone formations were not deposited in lakes and estuaries, nor are they of desert origin.” They are ‘ ‘ river deposits accumulated in
Pàgina 166 - as a deposit partly subaerial built by a river into or against a body of permanent water.” This study concerns the detailed structures of deltas and the physiography of the land that furnished
Pàgina 175 - the accuracy of surveys in inclined seams and an analysis of the sources of error. Ibid., vol. 20, pp. 299-301. Surveys in inclined shafts. Theoretical and practical considerations governing the choice of instruments. Ibid., vol. 20, pp. 420-421. Review of “A memoir on the Paleozoic reticulate sponges constituting the family
Pàgina 39 - I have intentionally refrained from burdening the text with references; and, therefore, the reader, while he is justly entitled to hold me responsible for any errors he may detect, will do well to give me no credit for what may seem original, unless his knowledge is
Pàgina 9 - general rule that a structure or organ once lost in the course of phylogeny can never be regained; if the organism subsequently has occasion to replace it, it cannot be reproduced, but must be constructed afresh in some different mode.
Pàgina 175 - 1907—Geology of the Marysville mining district, Montana: a study of Igneous intrusion and contact metamorphism. U. S. Geol. Survey, Prof. Paper 57, pp. 178, 16