Geological Magazine, Volume 6Henry Woodward Cambridge University Press, 1879 - Electronic journals |
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angular appear basalt base beds Boulder-clay boulders British Cambrian Carboniferous character clay cliffs Coal-measures Coast of Sumatra conglomerate containing corallites corals Cretaceous crystalline denudation deposits described Devonian diamonds Dingle district drift elevation evidence fauna feet felspar formation fossil fragments gabbro genus Geol geologists glacial glaciers Glengariff granite gravel grits hills hornblende island Journ Lake Limestone Lough Neagh Lower M'Coy marine Marl mass Mesozoic metamorphic miles mineral Miocene mountain observed occur Old Red Sandstone origin Paleozoic paper pebbles period Permian Phillips sp plates portion Precambrian present probably Prof quartz raised beach recent referred ridges river rocks sand schists serpentine shales shell side Silurian Skiddaw Skiddaw Slates slate species specimens stones strata Sumatra surface Tertiary thickness tin ground traces Triassic unconformity Upper Silurian valley volcanic Wales whorls Woodw
Popular passages
Page 557 - NICHOLSON. A Manual of Zoology, for the use of Students. With a General Introduction on the Principles of Zoology. By HENRY ALLEYNE NICHOLSON, MD, D.Sc., FLS, FGS, Regius Professor of Natural History in the University of Aberdeen.
Page 545 - ... excellent chemical reasons for maintaining that granite is in every case a rock of sedimentary origin — that is to say, it is made up of materials which were deposited from water, like beds of modern sand and gravel, and includes in its composition quartz, which, so far as we know, can only be generated by aqueous agencies, and at comparatively low temperatures.
Page 38 - Kinalian's work, now before us, aims to give a more detailed account of the strata, and of the facts to be observed in the field, thus acting as a guide to the geologist in his explorations. As the general features of the Geology of Ireland were pointed out at some length in the notice of Prof. Hull's book (see GEOL.
Page 31 - Florence of Worcester says : — "On the third day of the nones of Nov. 1099, the sea came out upon the shore, and buried towns and men very many, and oxen and sheep innumerable.
Page 377 - On the Cambrian (Sedgw.) and Silurian beds of the Dee Valley, as compared with those of the Lake-district.
Page 44 - By JW Davis, Esq., FGS The author described some fossil remains of fish obtained from the bone-bed immediately above the " Better-bed Coal " referred to by him in a former paper (see QJGS vol. xxxii. p. 332). The fossils described included Ichthyodorulites belonging to 4 species, namely : — Pleurodus affinit, a species named, but not described or figured by Agassiz ; Hoplonehus elegans, gen.
Page 154 - The trunks of the trees gradually decay until they are converted into a blackish-brown substance resembling peat, but which still retains more or less of the fibrous structure of the wood ; and layers of this often alternate with layers of clay and sand, the whole being penetrated, to the depth of four or five yards or more, by the long fibrous roots of the willows.
Page 3 - we have no reliable chronological scale in geology but such as is afforded by the relative magnitude of zoological change — in other words, that the geological duration and importance of any system is in strict proportion to the comparative magnitude and distinctness of its collective fauna."* In pursuance of the above principle I have separated the Cambrian System in North America from the Lower Silurian.
Page 330 - FGS Owing to the general absence of mechanical disturbance, the author is of opinion that "the Whin consists in part of altered sedimentary beds, that it partly represents beds which were once in the position it now occupies, that it did not make room for itself simply by thrusting aside these beds but also by incorporating them into itself.
Page 28 - because the lands covered by seas were originally at different altitudes, that the waters have risen, or subsided, or receded from some parts and inundated others. But the reason is, that the same land is sometimes raised up and sometimes depressed, and the sea also is simultaneously raised and depressed, so that it either overflows or returns into its own place again.