The American Journal of Science, Volumes 171-172J.D. & E.S. Dana, 1906 |
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Common terms and phrases
activity amount amphibole andesite angles appears beds biotite carbon Carboniferous cent chemical chloride cm³ color composition compression containing cooling Cretaceous crust crystals curve deposits described determined diameter Elasmosaurus enstatite experiments fauna feet feldspar figure flask formation fossils Geol Geological given glass grams granite heat hornblende hydrochloric acid Ibid igneous indicated interlocked iodine ionization iron limestone liquid lower magma magnesium magnetic mass material measured melting metal meteorite method microscope mineral mixture monoclinic observed obtained occur optical orthoclase orthorhombic oxide Paleozoic paper pegmatite Permian plagioclase plates platinum portion potassium precipitate present pressure primary prism probably produced pyroxene quartz radio-active radium rays refractive region rocks salt SCI.-FOURTH SERIES septa shale shell shown silicate solution species specific gravity specimens stibiotantalite substance sulphate sulphuric surface temperature thickness thorianite thorium tion tridymite tube upper vapor wollastonite zinc
Popular passages
Page 81 - Mendocino. Along the 185 miles of this rift where movement has actually been observed the displacement has been chiefly horizontal on a nearly vertical plane, and the country to the south-west of the rift has moved north-westerly relatively to the country on the north-east of the rift. By this it is not intended to imply that the north-east side was passive and the south-west side active in the movement. Most probably the two sides moved in opposite directions. The evidence of the rupture and of...
Page 363 - Mt Antero, Colorado. Ibid., 213-216. Results obtained by etching a Sphere and Crystals of Quartz with Hydrofluoric Acid (with Otto Meyer).
Page 182 - has for its chief characteristic the well-known and very valuable quarries of the Waverly system that lie along the Ohio River below Portsmouth. This subdivision has a definite base, viz., the upper surface of the Waverly black slate ; but there is no characteristic stratum that constitutes a convenient superior limit. As the most valuable of the building rock, however, that is furnished by this part of the series in southern Ohio occurs within fifty feet of the slate, these fifty feet next above...
Page 121 - ILLUSTRATIONS OF THE CGS SYSTEM OF UNITS. With Tables of Physical Constants. By Prof. JD Everett.
Page 82 - The great length of the rift upon which movement has occurred makes this earthquake unique. Such length implies great depth of rupture, and the study of the question of depth will, it is believed, contribute much to current geophysical conceptions. The time of the beginning of the earthquake as recorded in the observatory at Berkeley was 5(1.
Page 81 - Besides this general horizontal displacement of about 10 feet, there is observable in Sonoma and Mendocino counties a differential vertical movement not exceeding 4 feet, so far as at present known, whereby the south-west side of the rift was raised relatively to the north-east side, so as to present a low scarp facing the north-east. This vertical movement diminishes to the south-east along the rift line, and in San Mateo County is scarcely, if at all, observable.
Page 178 - ... material. When considered in its entirety, the vertebrate fauna of these beds is remarkably similar to, though distinctly more primitive than, that of the Laramie. Almost or quite all of the Laramie types of vertebrates are present, though, as a rule, they are represented by smaller and more primitive forms. The similarity between this fauna and that of the Laramie contrasts strongly with the great dissimilarity between the vertebrates of the Judith River and those of the Atlantosaurus beds,...
Page 37 - ... distilled water at the exact stem divisions observed in the sample water, we have nine pairs of readings, each pair giving the weights of equal volumes of distilled water and of the sample, and therefore each pair giving by their ratio an independent determination of the specific gravity of the sample, referred to that of distilled water of the same temperature as unity. The mean of the nine observations gives a result which, according to the doctrine of probabilities, should have a precision...
Page 302 - The incrustation is especially interesting as showing that the meteoric irons must have been imbedded a long time, as the formation of aragonite would be exceedingly slow in this dry climate. The remarkable quantity of oxidized black fragmental material that •was found at those points where the greatest number of small fragments of meteoric iron were found, would seem to indicate that an extraordinarily large mass of probably 500 or 600 pounds...
Page 103 - ... fine-grained, shows a considerable decrease in compressibility and this tendency to decrease persists even at high pressures". In this same connection, it is interesting to note that Adams and Coker1 had investigated the effects of grain size, including a granite in the trial runs, and concluded: "It will thus be seen that there is no correspondence between the coarseness of grain and the magnitude of the variations in the readings obtained.