The Quarterly Journal of the Geological Society of London, Volume 9The Society, 1853 - Electronic journals Vols. 1-108 include Proceedings of the society (separately paged, beginning with v. 30) |
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Common terms and phrases
abundant angle anticlinal appear Archegosaurus Bala bands Beaumont beds belong blue shale bones calcareous Caradoc Caradoc sandstone Carboniferous character circles of reference clay clay-slate cliff coal Coal-measures conglomerate containing corals crystalline DENDRERPETON deposit Devonian district division Eifel Eocene epoch fault feet thick felspathic Ferques fossiliferous fossils fragments genus Geol geologists gneiss granite Graptolites gravel grey hills Hudson River Group inch Island Journ lines of elevation Llandeilo mass Memoir miles mineral Murchison n. s. PL nearly numerous Nummulites observed occur Old Red Sandstone oolite paleozoic parallel pebbles pentagonal phænomena PLATE portion present Prof quartz Quebec R. I. Murchison reseau resembles ridge Salt Range sand schists seen Serra de Bussaco shells side Silurian rocks slates species specimens Spirifer strata surface tertiary testâ tion tufaceous upper valley valve Wales Wenlock
Popular passages
Page xxx - Axis of a great circle of a sphere is that diameter of the sphere which is perpendicular to the plane of the circle.
Page 44 - Bericht iiber die von Overweg auf der Reise von Tripoli nach Murzuk und von Murzuk nach Ghat gefundenen Versteinerungen.
Page 306 - ... and when they are impelled along a muddy bottom, they cannot fail to raise moraines and leave deep depressions in its otherwise smooth surface. But it will be well to bear in mind that when an iceberg touches the ground, if that ground be hard and resisting, it must come to a stand ; and the propelling power continuing, a slight leaning over in the water, or yielding motion of the whole mass, may compensate readily for being so suddenly arrested. If, however, the ground be soft, so as not to...
Page 276 - Each scale bears upon its inner anterior margin a thick solid bony rib, extending upwards beyond the margin of the scale, and sliced off obliquely above and below, on opposite sides, for forming splices with the corresponding processes of the adjoining scales.
Page 297 - Rink, the enterprising Danish traveller, it appears that sandstone is associated with this coal. At Cape Cranstoune, situate on the north side of North-east Bay (Omenak Fiord), and immediately adjacent to the above two localities, the trap-rocks again occur, and thence extend northward, apparently in one unbroken series, as far as Proven, in lat. 72° 20'.
Page 307 - Another, and probably the most common of these unusual modes, is from coast ice, which, impelled by the winds and tides, is often piled up with its load of rounded pebbles, sand, and mud against the sides of icebergs. The foreign substances thus cast upon the surface of an iceberg must necessarily be precipitated to the bottom at the first revolution it undergoes. The quantity of rocky matter which ice is capable of floating away can be estimated from the specific gravity of both substances. Taking...
Page 157 - This curious shell appears related to the family of Calyptreeidee, but it shows no trace of a spiral growth ; as far as can be judged from the imperfect specimens seen, it is equilateral, and both the transverse internal plate and the muscular attachment are placed along the middle of the back of the shell ; the external form may be described as a Calyptraea pressed together laterally till the sides nearly meet, leaving only a narrow opening for the foot of the animal.
Page 307 - ... received from Other sources. I have often thought that the fragments of a huge iceberg, acquiring a state of quiescence after separating into several masses in one of its fearfully grand revolutions, had turned up mud and other earthy matter from the bottom. This, however, is doubtful ; for we can hardly conceive it possible that anything extraneous can adhere to hard and brittle ice passing rapidly through the water during the iceberg's revolution. Icebergs are sometimes floated so close along...
Page 300 - Strait, and if the navigator meets with icebergs in the neighbourhood of this promontory, they must have drifted to it from other sources. As we advance northward along the coast of West Greenland, and thus diminish the annual mean temperature both of the sea and of the atmosphere, we find the glacier approaches nearer and nearer the coast-line, until in Melville Bay, lat. 75°, it presents to the sea one continuous wall of ice, unbroken by land, for a space of probably seventy or eighty miles.
Page 301 - ... until in Melville Bay, lat. 75°, it presents to the sea one continuous wall of ice, unbroken by land, for a space of probably seventy or eighty miles. To the southward of Melville Bay, there are numerous outlets for the ice in the coast, and they vary in breadth from two or three up to fifteen or twenty miles. To have a correct idea of the glacier accumulation in Greenland, we must imagine a continent of ice flanked on its seaward side by a number of islands, and in every other direction lost...