The Geology and Extinct Volcanos of Central France |
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Page xi
... existing hollow , afterwards raised by some sudden and anomalous process into the form of a mountain ! It has never , of course , been denied by any sound writer on volcanic action , that a certain proportion of the frame of a volcanic ...
... existing hollow , afterwards raised by some sudden and anomalous process into the form of a mountain ! It has never , of course , been denied by any sound writer on volcanic action , that a certain proportion of the frame of a volcanic ...
Page xii
... existing among French geologists on the great extinct volcanos of their own country . The clue to an understanding of a volcanic district must of course be a sound know- ledge of the " modus operandi " of volcanic action ; and this has ...
... existing among French geologists on the great extinct volcanos of their own country . The clue to an understanding of a volcanic district must of course be a sound know- ledge of the " modus operandi " of volcanic action ; and this has ...
Page 7
... existing river - beds . But these distinctions do not seem to me as yet well made out . † Mémoire sur le Nivellement des Monts Dômes . similar capping of horizontal strata of a hard and durable CHAP . II . LIMAGNE D'AUVERGNE .
... existing river - beds . But these distinctions do not seem to me as yet well made out . † Mémoire sur le Nivellement des Monts Dômes . similar capping of horizontal strata of a hard and durable CHAP . II . LIMAGNE D'AUVERGNE .
Page 9
... existing lakes . * Other beds consist of a quartzose grit formed of separate crystals of quartz , mica , and felspar , evidently formed in situ from the disintegrated materials of the granite on which they rest , and from which they are ...
... existing lakes . * Other beds consist of a quartzose grit formed of separate crystals of quartz , mica , and felspar , evidently formed in situ from the disintegrated materials of the granite on which they rest , and from which they are ...
Page 20
... existing in the stone . Where the cavity is of a considerable size , it is not filled throughout with the zeolite , but a nest or hollow pouch appears , lined with the most brilliant crystals . These are too well known in all mine ...
... existing in the stone . Where the cavity is of a considerable size , it is not filled throughout with the zeolite , but a nest or hollow pouch appears , lined with the most brilliant crystals . These are too well known in all mine ...
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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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