The Geology and Extinct Volcanos of Central France |
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Page viii
... appear from the following passage in the Preface to the Considerations on Volcanos , ' pub- lished in 1825 . " Geology has for its business a knowledge of the physical processes which are in continual or occasional operation within the ...
... appear from the following passage in the Preface to the Considerations on Volcanos , ' pub- lished in 1825 . " Geology has for its business a knowledge of the physical processes which are in continual or occasional operation within the ...
Page ix
... appear to have occurred in the earlier ages of the world's history , that until the processes which give rise to them have been maturely studied under every shape , and then applied with strict impartiality to explain the appearances in ...
... appear to have occurred in the earlier ages of the world's history , that until the processes which give rise to them have been maturely studied under every shape , and then applied with strict impartiality to explain the appearances in ...
Page x
George Poulett Scrope. still to appear cascading over the lips of craters of scoriæ , did assist in no small degree in putting an extinguisher on the then fading and flickering , but shortly before insolently triumphant , dogma . It had ...
George Poulett Scrope. still to appear cascading over the lips of craters of scoriæ , did assist in no small degree in putting an extinguisher on the then fading and flickering , but shortly before insolently triumphant , dogma . It had ...
Page xi
... appear to merit serious discussion . Pushed as it has been to extremity by the two last - named authorities , it in fact denies a volcano to be eruptive at all , that is to say , to be productive of any appreciable amount of lava or ...
... appear to merit serious discussion . Pushed as it has been to extremity by the two last - named authorities , it in fact denies a volcano to be eruptive at all , that is to say , to be productive of any appreciable amount of lava or ...
Page 6
... appear to have been occupied , from an early period in the tertiary æra , by as many freshwater lakes . These have left the proofs of their former existence in sedimentary strata of clay , marl , limestone , and sandstone , fre- quently ...
... appear to have been occupied , from an early period in the tertiary æra , by as many freshwater lakes . These have left the proofs of their former existence in sedimentary strata of clay , marl , limestone , and sandstone , fre- quently ...
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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...