The Journal of Geology, Volumen1;Volúmenes13-14University of Chicago Press, 1893 Vols. for 1893-1923 includes section: "Reviews." |
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Términos y frases comunes
acid anorthosite Appalachian Archean augite basal basin beds belt border boulders calcareous Cambrian carbonate Carboniferous character chemical coal coast conglomerate contain Cretaceous crystalline crystals debris deposits diabases diallage drainage drift drumlins eastern elevation epoch erosion eruptive evidence exhibit fault feet feldspar flows folding formation fossils gabbro Geol Geological Survey geologists glacial glacier gneiss granite gravel hornblende Huronian igneous Jour Keweenawan Lake Superior land Laurentian lime limestone lower magma Malaspina glacier manganese margin mass material metamorphism miles mineral moraine mountain observed occur ocean olivine origin osars oxide Paleozoic plagioclase porphyritic portion pre-Cambrian present probably Professor pyroxene quartz quartzite region rhyolites ridges river rocks sand sandstone schist sections sedimentary sediments sheet Silurian slope specimens strata streams structure subglacial surface terraces Tertiary thickness tion tunnels unconformity upper valley volcanic
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Página 817 - Notes on the Cambrian rocks of Pennsylvania and Maryland from the Susquehanna to the Potomac, by CD \Valcott.
Página 674 - ... square miles, — or one-third of the land area of Europe. In North America nearly one-half of the total area was covered by the Paleozoic sea ; in South America it was considerably less ; and we know too little of the Asiatic and African continents to place any estimate upon their Paleozoic areas. I think, however, if we take one-fourth of the present land area as the territory covered by the Paleozoic seas we shall be considerably within the actual amount, even if we add to the surface of the...
Página 282 - The pieces of limestone are so markedly different from the calcareous bed enclosing them that they cannot be confounded with it. The rock fragments are of unequal distribution in the deposit, both laterally and vertically, sometimes composing almost half of it, and sometimes being almost entirely absent. They vary from a fraction of an inch to several inches in diameter and are indiscriminately mixed.
Página 424 - The geographic development of the eastern part of the Mississippi drainage system. Am. Geol., vol. xi, 1893, pp.
Página 327 - The Evidence of the Fossil Plants as to the Age of the Potomac Formation,' by LF Ward, presented by J. W.
Página 653 - I obtain 113 tons as the total amount of matter in solution discharged into the Atlantic basin per annum from each square mile of area drained into it. Of this 49 tons consist of carbonate of lime and 5.5 tons of sulphate and phosphate of lime.4 Mechanical sediments.
Página 646 - Mr. Upham's paper gives a number of illustrations of geologic phenomena from Tertiary and Pleistocene geology that bear upon the time duration of these epochs. From the foregoing estimates of geologic time, the only conclusion that can be drawn is that the earth is very old, and that man's occupation of it is but a day's span as compared with the eons that have elapsed since the first consolidation of the rocks with which the geologist is acquainted. When I began the preparation of this paper it...
Página 431 - Price 10 cents. 65. Stratigraphy of the Bituminous Coal Field of Pennsylvania, Ohio, and West Virginia, by Israel C. White. 1891. 8". 212pp. 11 pi. Price 20 cents. 66. On a Group of Volcanic Rocks from the Tewan Mountains, New Mexico, and on the occurrence of Primary Quartz in certain Basalts, by Joseph Paxson Iddings.
Página 652 - If we allot 50 tons to carbonate of lime, 20 tons to sulphate of lime, 7 to silica, 4 to carbonate of magnesia, 4 to sulphate of magnesia, 1 to peroxide of iron, 8 to chloride of sodium, and 6 to the alkaline carbonates and sulphates we shall...
Página 648 - ... in partially enclosed seas or mediterraneans and on the borders of the continental plateau. The former is particularly true of the sedimentation of the Cordilleran and Appalachian seas and the broad Mississippian sea. The close of the prolonged period of Paleozoic sedimentation was brought about by what Dana has termed the "Appalachian revolution.