The Geology and Extinct Volcanos of Central France |
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Page 6
... 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 containing the ...
... 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 containing the ...
Page 7
... occupied by the wide and fertile valley of the Allier , called la Limagne d'Auvergne , extending from Brioude in the south to some distance beyond Moulins on the north , having an average width of near twenty miles . It was bounded ...
... occupied by the wide and fertile valley of the Allier , called la Limagne d'Auvergne , extending from Brioude in the south to some distance beyond Moulins on the north , having an average width of near twenty miles . It was bounded ...
Page 20
... occupied the vesicles formerly existing in the stone . Where the cavity is of a considerable size , it is not filled ... occupy separate cavities . The same crystallizations are found in cavities of the peperino as well as of the basalt ...
... occupied the vesicles formerly existing in the stone . Where the cavity is of a considerable size , it is not filled ... occupy separate cavities . The same crystallizations are found in cavities of the peperino as well as of the basalt ...
Page 49
... occupied , flowing in a manner differing only from that of basaltic lavas in proportion to their different consistence and very inferior fluidity , or the accidental circum- stances which may have concurred to modify their disposition ...
... occupied , flowing in a manner differing only from that of basaltic lavas in proportion to their different consistence and very inferior fluidity , or the accidental circum- stances which may have concurred to modify their disposition ...
Page 50
... occupy , seems to me proved by their rising in every instance either from the middle or the side of a regular crater and cone of scoriæ . * If it could be imagined possible for the volcano of the Mont Dore to have sent forth a vast ...
... occupy , seems to me proved by their rising in every instance either from the middle or the side of a regular crater and cone of scoriæ . * If it could be imagined possible for the volcano of the Mont Dore to have sent forth a vast ...
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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...