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accumulation Alenquer Ammonites angle ankerite appears Arenaceous shale Argillaceous shale beds bones calcareous Cape Mondego carboniferous chalk Channel character cliffs coal coast columella conglomerate containing crater Cret cretaceous D'Orb d'Orbigny denudation deposits depth described district elevation eocene eruption feet ferruginous folds formation fossils fragments gabbro genus Geol geological Goldf granite gravel hills Hippurite limestone igneous inch irregular Island jurassic lava layers leucite limestone Lisbon London clay lower margin marl mass metamorphic miles mineral Mondego Monte n. s. PL nearly numerous Nummulites observed occur oolite organic remains pebbles peperino period PLATE portion present R. I. Murchison red sandstone resemblance ridge river Rocca Monfina rocks rounded sand seen shells side Silurian slate species specimens Stigmaria strata subcretaceous series surface tertiary Testa thickness tion traces trachyte travertine Underclay Underclay Stigmaria upper valley valve vein volcanic whilst whorl
Seite 311 - This river is several hundred miles in length, and from half a mile to a mile and a half in breadth, and winds through a hilly, and in many places a fertile and highly cultivated country.
Seite xlvi - European forest-trees die out, he would reply that such alterations in the inanimate world might be multiplied indefinitely before he should have reason to anticipate, by reference to any known data, that the existing species of trees in our forests would disappear and give place to others. In a word, the movement of the inorganic world is obvious and palpable, and might be likened to the minute-hand of a clock, the progress of which can be seen and heard, whereas the fluctuations of the living creation...
Seite 201 - Journ. vi. 1850, pp. 439-440. [The GSJ says, " This paper was withdrawn by the author with the permission of the Council."] Analogy of the Structure of some Volcanic Rocks with that of Glaciers. Edinb. Roy. Soc. Proc. ii. 1851, pp. 17-18. On the power of Icebergs to make rectilinear, uniformly-directed Grooves across a Submarine Undulatory Surface. Phil. Mag. x. 1855, pp. 96-98. Vitality of Seeds. Gardeners...
Seite xxxii - Geology," the conviction at which I had then arrived, after devoting some time to observation in the field, and to the study of the works of earlier writers, that the existing causes of change in the animate and inanimate world might be similar, not only in kind, but in degree, to those which have prevailed during many successive modifications of the earth's crust.
Seite xlvi - Soc., vol. iii. p. 231. wholly inappreciable to the naturalist, still it is certainly far less manifest than the revolution always in progress in the inorganic world. Every year some volcanic eruptions take place, and a rude estimate might be made of the number of cubic feet of lava and scoriae poured or cast out of various craters. The amount of mud and sand deposited in deltas, and the advance of new land upon the sea, or the annual retreat of wasting sea-cliffs, are changes the minimum amount...
Seite 40 - Bischoff found that carbonic acid was gradually separated from carbonate of lime, by silicic acid with the co-operation of boiling water. This decomposition took place, whether the silicic acid was in a soluble or insoluble condition ; for even finely pulverized quartz decomposed the carbonate of lime, the process, however, in that case being rather slower.
Seite xlv - Whewell has justly observed, that " mechanical power retains its amount, however much it be distributed through time and divested of the character of extraordinary violence,"* — a principle which should never be lost sight of when we contrast the effects of the historical with those of antecedent epochs. It is not the magnitude of the effects, however gigantic their proportions, which can inform us in the slightest degree whether the operation was sudden or gradual, insensible or paroxysmal.
Seite 46 - Thrissops has not been found in any formations newer than the lithographic shales, we must be careful not to attach too much importance to the...
Seite 357 - ... to one-third of a mile northward of the last carboniferous beds, and always in the same band of slate and quartzite. Westward of the Acadia Mine, the course of the vein over the high ground is marked by the colour of the soil, as far as Cook's Brook, about a mile distant. The outcrop of the ore is not exposed in this brook, but large fragments of specular ore have been found in its bed, and a shaft, sunk on the course of the vein, has penetrated more than forty feet through yellow ochre containing...