The Journal of Geology, المجلد 1;المجلدات 13-14University of Chicago Press, 1893 Vols. for 1893-1923 includes section: "Reviews." |
طبعات أخرى - عرض جميع المقتطفات
عبارات ومصطلحات مألوفة
anorthosite Archean augite basal basin beds belt boulders calcareous Cambrian carbonate of lime carbonic acid Carboniferous character chemical coal coast conglomerate Cretaceous crystalline crystals deposits diabases diallage drainage drift eastern englacial erosion eruptive evidence exhibit fact feet feldspar folding formation fossils gabbro Geol Geological Survey geologists glacial epoch glacier gneiss granite gravels hornblende Huronian ice-sheet igneous iron and manganese Jour Keweenawan Lake Superior later Laurentian lavas limestone lower magma manganese mass material metamorphism miles mineral moraine mountain observations occur ocean olivine origin oxide paleolithic Paleozoic phenomena plagioclase porphyritic portion pre-Cambrian present probably Professor pyroxene quartz quartzite region rhyolites ridges Riga Schist river rocks sand sandstone schist sections sedimentary sediments sheet Silurian slope specimens strata streams structure surface terrace Tertiary theory thickness tion unconformity upper valley volcanic
مقاطع مشهورة
الصفحة 175 - He was a fellow of the royal societies of London and Edinburgh, and a member of some other learned bodies.
الصفحة 266 - 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.
الصفحة 404 - The geographic development of the eastern part of the Mississippi drainage system. Am. Geol., vol. xi, 1893, pp.
الصفحة 611 - Agency of organisms; 2". Chemical precipitation; 3. By mechanical methods. It is the general opinion of geologists that limestone rocks are the result almost entirely of the consolidation of lime removed from the sea water through the agency of life, and that they consist of the remains of foraminifera, crinoids, corals, etc., or their fragments, embedded in a more or less crystalline matrix resulting from subsequent alteration of the original deposits. This, however, has been seriously questioned....
الصفحة 201 - The Crocodilian Remains found in the Elgin Sandstones, with remarks on the Ichnites of Cummingstone.
الصفحة 432 - The non-feldspathic intrusive rocks of Maryland and the course of their alteration.
الصفحة 609 - 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.
الصفحة 409 - 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.
الصفحة 607 - Our knowledge of the conditions north of the 55th parallel is limited by the want of accurate geologic data. If Cambrian and Carboniferous rocks were not deposited in the Mackenzie river basin and also on the eastern side of the area now covered by Cretaceous strata, the inference is that during Cambrian and Carboniferous time there was a land area to the east and north of the northern Cordilleran sea that may have been tributary to the latter.
الصفحة 625 - It is correlated with the Bow River series, which contains, in the upper portion, the lower Cambrian fauna. The presence of these calcareous beds indicates a slower rate of deposition than we have estimated for the lower portion of the Cambrian...