Geological Magazine, Band 3;Band 8;Band 28Henry Woodward Cambridge University Press, 1891 |
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Andere Ausgaben - Alle anzeigen
Häufige Begriffe und Wortgruppen
A. S. Woodward andesites appears Archæan augite beds bones Boulder-clay boulders Cambrian carbonate Carboniferous character chemical clay coal Coal-measures containing Cretaceous Crinoids crystals Daghestan Dendrerpeton denudation deposits described Devonian district disturbed area earthquake elevation Eocene epicentrum Estheria evidence fact fault fauna feet felspar formation fossils fragments Geikie genera genus Geol GEOLOGICAL MAGAZINE geologists glacial glaciers gneiss granite gravel Greensand Himalayas Hylonomus ibid inches interradial island Lake latter limestone lower Lydekker margin mass memoir mica miles mineral Miocene mountains nature nearly observations occur Olenellus original paper period plates Pleistocene Pliocene portion present probably Proc Prof recent referred regard region remains remarks river rocks rutile sand sandstone schists shales shells shock side Silurian skull South species specimens Stegosaurus strata structure surface teeth Tertiary thickness Traquair Triceratops Upper valley vertebræ volcanic
Beliebte Passagen
Seite 493 - HULL— COAL FIELDS of GREAT BRITAIN ; their History, Structure, and Resources ; with Notices of the Coal Fields of other parts of the World. By EDWARD HULL, MA, FRS, Director of the Geological Survey of Ireland, Professor of Geology in the Royal College of Science, Dublin, &c.
Seite 54 - Microseismic shock: recorded by a single seismograph or by seismographs of the same model, but not by several seismographs of different kinds; the shock felt by an experienced observer.
Seite 54 - X. Great disasters, ruins, disturbance of strata, fissures in the earth's crust, rock-falls from mountains.
Seite 126 - Contributions to the Tertiary Fauna of Florida, with especial reference to the miocene silex-beds of Tampa and the pliocene beds of the Caloosahatchie River [including in many cases a complete revision of the generic groups treated of and their American tertiary species].
Seite 318 - I would refer those who may be anxious to know the last word on this much-debated question. The evidence of inter-Glacial conditions within the Alpine lands continues to increase. These are represented by alluvial deposits of silt, sand, gravel, conglomerate, breccia, and lignites. Penck, Bohm, and Bruckner find evidence of two inter-Glacial epochs, and maintain that there have been three distinct and separate epochs of glaciation in the Alps.
Seite 395 - pro-mammalian " group, and not by any of the known forms of Sauropsida ; and there is other evidence which tends in the same direction. Thus, the Amphibia are the only air-breathing Vertebrata, which. like Mammals, have a dicondylian skull. It is only in them that the articular element of the mandibular arch remains cartilaginous; while the quadrate ossification is small, and the squamosal extends down over it to the osseous elements of the mandible ; thus affording an easy transition to the mammalian...
Seite 40 - The supposed continuous upward succession from the rocks on the shore of the Bristol Channel to those in the neighbourhood of Barnstaple, including, according to some authors, no less than ten groups, and classed into three divisions under the names Lower, Middle, and Upper Devonian, is, the author believes, an erroneous interpretation. The beds, he says, have been greatly plicated and faulted, and consequently several times repeated, and instead of being one continuous series, they occur folded...
Seite 41 - Kiver, running in a north-easterly direction along a subsidiary anticline from near Jasper for a distance of sixty miles. From the base of the Cambrian beds, the whole Lower and Upper Palaeozoic formations succeed each other in apparently conformable sequence, except at the junction of the Upper and Lower Silurian series, where a probable discordance occurs. The prolonged period of subsidence and deposition at length gave way to elevation ; acting with the greatest effect along the Alleghanies. Under...
Seite 409 - Berrima in the Southern Coal Field. At Hartley Vale where it has been extensively mined for some years, the seam is from 3 to 5 feet thick, and occurs in the Coal Measures at about 60ft. above their base, or 40 ft. above the main coal seam. This so-called Kerosene shale yields up to 180 gallons of crude oil, or 18,000 cubic feet of gas per ton with an illuminating power equal to 40 candles. For mixing with coal in order to increase the illuminating power of ordinary coal gas, this cannel coal is...
Seite 543 - It seems strange that the occasional inequalities of the floors of the coal beds, the sand or gravel ridges which traverse them, the channels cut through the coal, the occurrence of patches of sand, and the insertion of wedges of such material splitting the beds, have been regarded by some able geologists as evidences of the aquatic origin of coal.