The Geology and Extinct Volcanos of Central France |
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Page 1
... feet above the sea in the Auvergne and Forèz , and a still greater in the Gevaudan and Vivarais , where it reaches the height of 5500 feet . Here it is abruptly cut down by the deep valley of the Rhone , which , running nearly due north ...
... feet above the sea in the Auvergne and Forèz , and a still greater in the Gevaudan and Vivarais , where it reaches the height of 5500 feet . Here it is abruptly cut down by the deep valley of the Rhone , which , running nearly due north ...
Page 4
... feet high . These plateaux are called " causses " in the provincial dialect , and they have a singularly dreary and desert aspect from the monotony of their form and their barren and rocky character . The valleys which separate them are ...
... feet high . These plateaux are called " causses " in the provincial dialect , and they have a singularly dreary and desert aspect from the monotony of their form and their barren and rocky character . The valleys which separate them are ...
Page 6
... feet . But the lakes have long since been drained - probably through the effect of some of the subterranean convulsions of which this country has evidently been the theatre ; and these lacustrine strata have been cut through , worn down ...
... feet . But the lakes have long since been drained - probably through the effect of some of the subterranean convulsions of which this country has evidently been the theatre ; and these lacustrine strata have been cut through , worn down ...
Page 10
... feet . They are for the most part either light yellowish green or white , and have very much the aspect of chalk , with , like it , a semicon- choidal fracture when the strata are sufficiently thick . Usually , however , they are thinly ...
... feet . They are for the most part either light yellowish green or white , and have very much the aspect of chalk , with , like it , a semicon- choidal fracture when the strata are sufficiently thick . Usually , however , they are thinly ...
Page 11
... feet with the more ordinary marls . The surfaces of these beds are usually mammillated or botryoidal , and the calcareous matter enveloping the Indusiæ is arranged concentrically in the manner of a stalag- mite . Where the bed is ...
... feet with the more ordinary marls . The surfaces of these beds are usually mammillated or botryoidal , and the calcareous matter enveloping the Indusiæ is arranged concentrically in the manner of a stalag- mite . Where the bed is ...
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Common terms and phrases
Allier ancient appears Ardèche augite Auvergne basin bed of basalt breccia calcareous calcareous peperino Cantal cellular Central France chain of puys channel character Clermont clinkstone colour columnar compact conglomerate considerable contains covered crater Crown 8vo current of lava deposits distance district domite dyke east Edition elevation eruption evidently excavation Fcap feet felspar fissures flowed formed fragments freshwater formation geologists Gergovia gneiss granitic platform Graveneire Haute Loire heights hill Illustrations lacustrine lake lava lava-current Le Puy Limagne limestone marls mass matter Mezen miles Mont Dore Monts Dôme mountain neighbouring numerous observed occupied olivine Pariou peperino plain Plate plateau points Pomel Pont Portrait Post 8vo prisms probably Puy de Dôme recent remarkable ridge rise river rock sandstone scoriæ side Sioule slope strata stream of lava substance summit surface tertiary thick tion trachyte tuff valley vent Vivarais volcanic cones Vols Woodcuts
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Page 206 - ... been completed. There was first a period when the spacious lakes, of which we still may trace the boundaries, lay at the foot of mountains of moderate elevation, unbroken by the bold peaks and precipices of Mont d'Or, and unadorned by the picturesque outline of the Puy de Dome, or of the volcanic cones and craters now covering the granitic platform. During this earlier scene of repose, deltas were slowly formed ; beds of marl and sand several hundred feet thick deposited; siliceous and calcareous...