The Quarterly Journal of the Geological Society of London, المجلد 1The Society, 1845 Vols. 1-108 include Proceedings of the society (separately paged, beginning with v. 30) |
طبعات أخرى - عرض جميع المقتطفات
عبارات ومصطلحات مألوفة
abundant Ammonites appears Atherfield beds Belemnites belong bones boulders calcareous carboniferous cavities cells chalk character clay cliff coast colour conglomerate considerable consist containing coral crag cretaceous Crioceras D'Orbigny deposits described distinct district east elevation Eocene exhibited extending feet thick Forbes fossiliferous fossils fragments furrows genera genus Geological Society Glyptodon gneiss granite Green Sand grey gypsum hills horizontal Hythe inches island lake lamellæ layers lime limestone Lonsdale Lower Green Sand marine marked marl masses miles mineral miocene mollusca Monte mountain nearly Neocomian nodules numerous observed occur oolitic Peasemarsh Pecten Perim Island Permian phragmocone porphyry portion present probably quarries red sandstone remarkable resembling ridge river rocks seen serpentine shales shells shore side Silurian slate species specimens strata striæ structure surface T. C. pl teeth Terebratula tertiary testâ traced transverse trap upper valley whorls
مقاطع مشهورة
الصفحة 368 - Himalayahs, has proved more abundant in genera and species than that of any other region yet explored. As a general expression of the leading features, it may be stated, that it appears to have been composed of representative forms of all ages, from the oldest of the tertiary period...
الصفحة 562 - This fact of the ocean-islands being so generally volcanic, is, also, interesting, in relation to the nature of the mountainchains on our continents, which are comparatively seldom volcanic ; and yet we are led to suppose, that where our continents now stand, an ocean once extended. Do volcanic eruptions, we may ask, reach the surface more readily through fissures, formed during the first stages of the conversion of the bed of the ocean into a tract of land...
الصفحة viii - Geological Observations on the Volcanic Islands visited during the Voyage of HMS Beagle; together with some brief Notices on the Geology of Australia and the Cape of Good Hope; being the second part of the Geology of the Voyage of the Beagle.
الصفحة 566 - Paloeozoic series of Australia and Tasmania may be regarded as partly the equivalent of the Devonian and carboniferous system of other countries. I cannot conclude these brief notes without remarking that many forms in these deposits may have been obliterated ; and others so considerably altered, that it is rather difficult to institute careful comparisons, from the metamorphic action that has been induced on many of the strata by the intrusion of trappean dikes, and which appear to have been more...
الصفحة 391 - ... existence. Reflecting how powerful an agent with respect to denudation, and consequently to the nature and thickness of the deposits in accumulation, the sea must ever be, when acting for prolonged periods on the land, during either its slow emergence or subsidence ; reflecting, also, on the final effects of these movements in the interchange of land and ocean-water on the climate of the earth, and on the distribution of organic beings, I may be permitted to hope, that the conclusions derived...
الصفحة 455 - St. Mary's below the rapids being hidden by drift, water, or an almost impervious forest, so as hitherto to have escaped notice, it is difficult to determine with any confidence its place or age. There seems no reason to think that it can be more recent than the old red sandstone ; and when it is considered that it appears in the St. Mary's at low levels, forming nearly horizontal strata at the bottom of Lake George, whilst the horizontal fossiliferous limestone of Sugar Island and St. Joseph's rises...
الصفحة 125 - ... fins, with greater vigour and precision than the modern Decapod Dibranchiata. The position of the animal was, most probably, more habitually vertical than that of its recent congeners. Thus placed, the Belemnite, in quest of prey, would rise swiftly or stealthily to infix its claws in the belly of a supernatant fish, and then dart down, and drag its prey to the bottom and devour it.
الصفحة 568 - Australian ocean, anterior to that period, contain many fonns which, if not perfectly identical, are at least the representative ones of those of the northern region. " In instituting a comparison between the species collected from the Australian deposits, and those described from the Burdwan coal-field by Professor Royle, we observe both the remarkable analogy of form of some species and the actual identity of others ; from which we may probably be led to infer that the deposition of the strata...
الصفحة 192 - Panoprea to assume when alive. After this a temporary change followed, when an influx of sand mingling with the calcareous mud, caused a state of sea-bottom peculiarly favourable to the presence of animal life. In this way were called into existence a multitude of species, which were added to those which had appeared before these.
الصفحة 391 - We there see vast areas rising, with volcanic matter every now and then bursting forth through the vents or fissures with which they are traversed. We see other wide spaces slowly sinking without any volcanic outbursts ; and we may feel sure, that this sinking must have been immense in amount as well as in area, thus to have buried over the broad face of the ocean every one of those mountains, above which atolls now stand like monuments, marking the place of their former existence.