The Geology and Extinct Volcanos of Central France |
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Page xi
... matter ; since such products , if they really accompanied in enormous quan- tities ( as observers have been in the habit of believing from the evidence of their senses ) the often repeated eruptions of active volcanos , must have ...
... matter ; since such products , if they really accompanied in enormous quan- tities ( as observers have been in the habit of believing from the evidence of their senses ) the often repeated eruptions of active volcanos , must have ...
Page xii
... matter composing the dykes , which are so frequent towards the centre of every volcanic mountain , would indicate ... matters , whether frag- mentary or in the form of congealed lava - currents ; a process which in fact may be witnessed ...
... matter composing the dykes , which are so frequent towards the centre of every volcanic mountain , would indicate ... matters , whether frag- mentary or in the form of congealed lava - currents ; a process which in fact may be witnessed ...
Page 9
... matter is calcareous , and the stone more brittle . The calcareous matter sometimes is aggregated into nodular concretions , passing into solid beds of limestone resembling the Italian travertin or the deposits of mineral springs . It ...
... matter is calcareous , and the stone more brittle . The calcareous matter sometimes is aggregated into nodular concretions , passing into solid beds of limestone resembling the Italian travertin or the deposits of mineral springs . It ...
Page 11
... matter from the depositions of some neighbouring spring , they will assume pre- cisely the appearance of the remarkable rock which we find in Auvergne , composing repeated strata of considerable bulk , alter- nating through a thickness ...
... matter from the depositions of some neighbouring spring , they will assume pre- cisely the appearance of the remarkable rock which we find in Auvergne , composing repeated strata of considerable bulk , alter- nating through a thickness ...
Page 12
... matter is often replaced by calcareous spar , occa- sionally by bitumen , which appears too in veins or crevices of this rock . Some are traversed by veins of flint or semi - opal . Indeed the whole rock becomes in some parts highly ...
... matter is often replaced by calcareous spar , occa- sionally by bitumen , which appears too in veins or crevices of this rock . Some are traversed by veins of flint or semi - opal . Indeed the whole rock becomes in some parts highly ...
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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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