The American Journal of Science, Volume 195J.D. & E.S. Dana, 1918 |
Table des matières
| 4 | |
| 6 | |
| 15 | |
| 34 | |
| 50 | |
| 54 | |
| 64 | |
| 65 | |
| 222 | |
| 231 | |
| 237 | |
| 269 | |
| 281 | |
| 301 | |
| 326 | |
| 336 | |
| 71 | |
| 78 | |
| 81 | |
| 91 | |
| 103 | |
| 118 | |
| 126 | |
| 140 | |
| 151 | |
| 153 | |
| 174 | |
| 185 | |
| 201 | |
| 337 | |
| 347 | |
| 362 | |
| 370 | |
| 377 | |
| 411 | |
| 438 | |
| 445 | |
| 457 | |
| 463 | |
| 470 | |
| 476 | |
| 486 | |
Autres éditions - Tout afficher
Expressions et termes fréquents
Ameghino amount angle appear Arisaig atoll augite axis Beds calcite carbonate cavity cent Chem chemical chert cm³ coal composition coral cordierite Cretaceous cristobalite crystalline crystals curves Cuttingsville cylinder deposits described determined dikes dilutions dolomite eruptive essexite etch evidence faces fauna feet feldspar figures formation fossils Funafuti Geol Geological Glass Granite Hill Hermit trail hornblende hydrogen hydrolysis hypophosphoric acid ilvaite indicate iodine limestone lower marine measured ments method mineral Moraine Moss Creek nordmarkite observed obtained occurs origin oxalate Patagonia Patagonian phase phosphorous acid plane porphyry precipitate present pressure prism probably pulaskite Pyrotherium quartz reef region rhombohedron Rio Negro Roca rock San Jorge sand sandstones sediments shales Silurian SiO2 sodium solution spark species specimen strata Supai surface syenite TABLE temperature ternary Tertiary thick thorium thorium nitrate tion tube Upper valley West Sixmile zone
Fréquemment cités
Page 72 - 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 346 - MAY, 1918. 27 camptonite may prove to be fine-textured essexite porphyries. The dikes range in thickness from a fraction of an inch to 25 feet, with an average of about one foot. The dikes are most numerous in or near eruptive areas. They rarely occur more than half a mile distant. In the eruptive areas they are not confined to any particular kind of plutonic rock, though they seem to be more numerous near contacts of the syenites with essexite. DATE OF ERUPTIVITY. There is little direct evidence...
Page 320 - Wialchia, and probably of Callipteris, if my tentative generic identification of the latter is correct, points to lower Permian age of the flora. * * * In any event, it appears probable that the flora, when it is better known, will be found to indicate a level not below the highest stage of the Pennsylvanian.
Page 442 - ... ramifications and complications of natural rock formation as a problem impossible of adequate solution in the laboratory. It is therefore a matter of satisfaction to all those who have participated in these efforts to see the ^evidences of this apprehension disappearing gradually as the work has progressed. A careful appraisement of the situation to-day, after ten years of activity, reveals the fact that the tangible grounds for anxiety about the accessibility of the problems which we then confronted...
Page 439 - National Academy of Sciences held its annual meeting April 22-24, 1918, at the Smithsonian Institution, President Walcott presiding. The scientific program which -was printed in the last issue of SCIENCE included reports of important researches, summaries of war work connected with the National Research Council (a committee of the Academy), and the William Ellery Hale lectures on " The Beginning of Human History from the Geologic Record," by Dr. John C. Merriam, of the University of California. At...
Page 202 - ... Technology more than twenty-five years ago. The purpose is expressed by the authors thus, — "To furnish a broad general perspective of the evolution of science, to broaden and deepen the range of the students' interests, and to encourage the practise of discriminating scientific reading, ... by furnishing the student and the general reader with a concise account of the origin of that scientific knowledge and that scientific method which, especially within the last century, have come to have...
Page 323 - ... the collecting of tracks a problem requiring special tools and trained personnel. Schuchert's ' description of the Supai as exposed on the Hermit Trail is as follows : The lower Supai formation [Supai of modern nomenclature] begins with a thick-bedded and cross-bedded cliff-making sandstone of about 150 feet in thickness. Beneath it are red sandy shales with two bands of sandstones that together have an estimated thickness of 200 feet. At the base of this zone is another horizon of thin flaggy...
Page 320 - The condition of preservation of the fragments is so bad that caution is necessary in basing conclusions of any kind on the material submitted. However, the presence of...
Page 314 - That the Kaibab limestone is of early Permian age is now admitted by most American stratigraphers. This view, however, has been attained rather from its field relations than through a study of its marine 'fossils, for these in several forms are very much like those of the Pennsylvanian.
Page 434 - The spectrum of the high potential discharge between metallic electrodes in liquids and in gases at high pressures, by GE Hale and NA Kent. For v. 1-2 see preceding catalogue, vi, 6. Hale, George Ellery. r 522.1 His Ten years...