The American Journal of ScienceJ.D. & E.S. Dana, 1919 |
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Common terms and phrases
åkermanite algæ algal anorthosite appear asthenosphere atom Barrell basins beds bowlders Bull CaO MgO CaO.MgO.2SiO Carlim composition CaO Composition wt compound coral cristobalite crust Cryptolithus crystals deflections density deposits diopside earth electrons elevation erosion evidence fauna feet field formation fossils gabbro geodetic Geol Geological geologists Glacial Glass Glass+crystals Glasstrace granite graphite gravity Grenville Hackberry Hayford hypothesis igneous indicated inversion islands isostasy isostatic compensation Joseph Barrell Jour Journal laccolith lagoon limestone mass melting miles mineral monticellite mountain Naticopsis observed ocean Ordovician origin orthogenesis oxide paleontology paper pebbles phases Pleistocene present probably pseudowollastonite quartz reefs region relations rocks Salona schist SCI.-FOURTH SERIES sea-level sediments shale shown silica SiO2 solid solutions species specimens Spirifer structure surface Survey temperature tephroite ternary system theory thickness tion torbernite Trenton tridymite upper vertical Webster wollastonite wollastonite solid writer zone
Popular passages
Page 296 - ... mountains, mountain ranges, and valleys of magnitude equivalent to mountains, exist generally in virtue of the rigidity of the earth's crust; continents, continental plateaus, and oceanic basins exist in virtue of isostatic equilibrium in a crust heterogeneous as to density.
Page 269 - Geology of the Marysville mining district. Montana, a study of igneous intrusion and contact metamorphism, by Joseph Barrel!.
Page 153 - Washington, DC The Institute for Government Research is an association of citizens for cooperating with public officials in the scientific study of government with a view to promoting efficiency and economy in its operations and advancing the science of administration.
Page 302 - From the evidence it is safe to conclude that the isostatic compensation is so nearly complete on an average that the deflections of the vertical are thereby reduced to less than one-tenth of the mean values which they would have if no isostatic compensation existed.
Page x - AMERICAN JOURNAL OF SCIENCE ESTABLISHED BY BENJAMIN SILLIMAN IN 1818. The Leading Scientific Journal in the United States Devoted to the Physical and Natural Sciences, with special reference to Physics and Chemistry on the one hand, and to Geology and Mineralogy on the other.
Page 156 - Lambert projection is conformal, that is, all angles between intersecting lines or curves are preserved; and for any given point (or restricted locality) the ratio of the length of a linear element on the earth's surface to the length of the corresponding map element is constant for all azimuths or directions in which the element may be taken. 2. The meridians are straight lines and the parallels are concentric circles. 3. It has two axes of strength instead of one, the standard parallels of the...
Page 268 - The evidence is regarded as strong that the air-bladder was originally developed as a supplemental breathing organ, although in modern fishes it has been mostly diverted to other uses. Among certain Devonian fishes, living under more and more strenuous climatic conditions of seasonal dryness, the use of the air-bladder for respiration became essential, and with the diminishing availability of the waters of certain regions the gills in those species which survived this crisis in evolution...
Page 156 - Lambert projection that are not found in the Polyconic may be stated briefly as follows: 1. The Lambert projection is conformal — that is, all angles 'between intersecting lines or curves are preserved, and for any given point (or restricted locality) the ratio of the length of a linear element on the earth's surface to the length of the corresponding map element is constant for all azimuths or directions in which the element may be taken. 2. The meridians are straight lines, and the parallels...
Page 269 - The progress of organic evolution has depended upon a series of fortunate physical events, conditioned in the internal nature of sun and earth, rather than the byproduct of mere life activities as expressed in orthogenesis through long periods of time. Evolution is in no sense an inevitable consequence of life, and the compulsion of climatic change has been more than once a fundamental factor in the age-long ascent from protozoan to man.
Page 208 - Geological Notes on the Pribilof Islands, Alaska, with an Account of the Fossil Diatoms; by G.