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abundant alluded alluvium Alps ancient aqueous argillaceous augite basalt beds bones calcareous Caldera called carbonate carboniferous character clay cliffs coal cone conglomerate consist containing corals Crag crater cretaceous crystalline crystals denudation deposits Devonian dikes earth Eocene eruptions fauna feet thick felspar fish fissures flints formations fossil fossiliferous fragments freshwater genera genus Geol geological geologists gneiss granite gravel Greensand height horizontal hornblende igneous island lakes land lava layers Lias lime limestone Llandeilo London clay Lower marine marl mass metamorphic mica miles mineral Miocene mountain newer observed occur older Oolite organic remains origin pebbles period plants Pliocene plutonic rocks portion quadrupeds quartz Red Sandstone region reptiles river sand schists scoriae seen shale shells Silurian slate sometimes species stone strata stratified supposed surface tertiary tion trachyte trap tuff Upper valley veins vertical volcanic rocks Wealden white chalk
Seite iii - Principles of Geology; or, the Modern Changes of the Earth and its Inhabitants considered as illustrative of Geology. Ninth Edition. Woodcuts. 8vo. 18s. - Manual of Elementary Geology ; or, the Ancient Changes of the Earth and its Inhabitants illustrated by its Geological Monuments.
Seite 23 - The upper valve is almost invariably wanting, though occasionally found in a perfect state of preservation in the white chalk at some distance. In this case we see clearly that the sea-urchin first lived from youth to age, then died and lost its spines, which were carried away. Then the young Crania adhered to the...
Seite 318 - ... The peculiar aspect which is most characteristic of the Lias in England, France, and Germany, is an alternation of thin beds of blue or gray limestone, having a surface which becomes light-brown when weathered, 318 NAME OF
Seite 653 - PRACTICAL MERCANTILE CORRESPONDENCE. A Collection of Modern Letters of Business, with Notes, Critical and Explanatory, and an Appendix, containing a Dictionary of Commercial Technicalities, pro forma Invoices, Account Sales, Bills of Lading, and Bills of Exchange ; also an Explanation of the German Chain Rule.
Seite 394 - Ohio, the proportion of hydrogen, oxygen, and other volatile matters, ranges from forty to fifty per cent. Eastward of this line, on the Monongahela, it still approaches forty per cent., where the strata begin to experience some gentle flexures. On entering the Alleghany Mountains, where the distinct anticlinal axes begin to show themselves, but before the dislocations are considerable, the volatile matter is generally in the proportion of eighteen or twenty per cent.
Seite 231 - When we have once arrived at the conviction that the nummulitic formation occupies a middle place in the Eocene series, we are struck with the comparatively modern date to which some of the greatest revolutions in the physical geography of Europe, Asia, and northern Africa must bo referred.
Seite 60 - We often said to ourselves, What clearer evidence could we have had of the different formation of these rocks, and of the long interval . which separated their formation, had we actually seen them emerging from the bosom of the deep ? We felt ourselves necessarily carried back to the time when the schistus on which we stood was yet at the bottom of out.
Seite 141 - Secondly; a gradual submergence then took place, bringing down each part of the land successively to the level of the waters, and then to a moderate depth below them. Large islands and bergs of floating ice came from the north, which, as they grounded on the coast and on shoals, pushed along all loose materials of sand and pebbles, broke off...
Seite 383 - It may be affirmed that generally in the " cypress swamps " of the Mississippi no sediment mingles with the vegetable matter accumulated there from the decay of trees and semi-aquatic plants. As a singular proof of this fact, I may mention that whenever any part of a swamp in Louisiana is dried up, during an unusually hot season, and the wood...
Seite 53 - German geologists, streichen signifying to extend, to have a certain direction. Dip and strike may be aptly illustrated by a row of houses running east and west, the long ridge of the roof representing the strike of the stratum of slates, which dip on one side to the north, and on the other to the south.