The Geology and Extinct Volcanos of Central France |
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Page 17
... vol- canic ashes and fragments were occasionally ejected from some neighbouring volcano in active eruption . Immediately behind this cliff rises the Puy de Dallet ( 6 in woodcut ) , an isolated hill about 900 feet high above the river ...
... vol- canic ashes and fragments were occasionally ejected from some neighbouring volcano in active eruption . Immediately behind this cliff rises the Puy de Dallet ( 6 in woodcut ) , an isolated hill about 900 feet high above the river ...
Page 28
... vol- canic rocks present themselves . M. le Coq informs me that several basaltic dykes appear near the junction of the porphyry and granite ; while others penetrate through beds of rolled pebbles , probably belonging to the lower term ...
... vol- canic rocks present themselves . M. le Coq informs me that several basaltic dykes appear near the junction of the porphyry and granite ; while others penetrate through beds of rolled pebbles , probably belonging to the lower term ...
Page 32
... vol- canos in activity , or learnt to distinguish with accuracy the substances which have been produced or altered by this class of natural agents , fell into numerous errors ; mistook every chasm for a crater , every mass of basalt for ...
... vol- canos in activity , or learnt to distinguish with accuracy the substances which have been produced or altered by this class of natural agents , fell into numerous errors ; mistook every chasm for a crater , every mass of basalt for ...
Page 35
... ( vol . ii . p . 75 ) , together with a paper in the Edinburgh Phil . Journ . , ' April , 1829 . C. Lyell has since ... vols . ii . , iii . , iv . M. Bertrand Roux , Description du Puy en Velay , 1823 - an excellent work so far as it ...
... ( vol . ii . p . 75 ) , together with a paper in the Edinburgh Phil . Journ . , ' April , 1829 . C. Lyell has since ... vols . ii . , iii . , iv . M. Bertrand Roux , Description du Puy en Velay , 1823 - an excellent work so far as it ...
Page 48
... is therefore wholly unnecessary , nor should we be * Vide Brocchi , Cat . Rag . passim . - Brieslak , Institutions Géologiques , vol . iii . , & c . & c . warranted in the attempt , to account for its production 48 CHAP . V. VOLCANOS OF ...
... is therefore wholly unnecessary , nor should we be * Vide Brocchi , Cat . Rag . passim . - Brieslak , Institutions Géologiques , vol . iii . , & c . & c . warranted in the attempt , to account for its production 48 CHAP . V. VOLCANOS OF ...
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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...