The Geology and Extinct Volcanos of Central France |
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Page xii
... substance of the central part of the cone as having been formed in this manner . And in some such proportion , elevation , in the sense implied by the elevation - crater theorists , may be admitted to have assisted in the production of ...
... substance of the central part of the cone as having been formed in this manner . And in some such proportion , elevation , in the sense implied by the elevation - crater theorists , may be admitted to have assisted in the production of ...
Page 19
... substances during the consolidation of a lava which by some mechanical cause had been universally penetrated with calcareous matter . * La Montagne de Cour - cour , an insulated hill of considerable size rising alone from the plain near ...
... substances during the consolidation of a lava which by some mechanical cause had been universally penetrated with calcareous matter . * La Montagne de Cour - cour , an insulated hill of considerable size rising alone from the plain near ...
Page 20
... substance . Its principal compo- nent rock is like those already described , a peperino of basaltic fragments , small scoriæ , and fine volcanic detritus mingled with fragments of limestone of various sizes , and united by a calca ...
... substance . Its principal compo- nent rock is like those already described , a peperino of basaltic fragments , small scoriæ , and fine volcanic detritus mingled with fragments of limestone of various sizes , and united by a calca ...
Page 21
... substance formerly exuded in great abundance from the Puy de la Poix , but the source at present seems exhausted . At the northern base of the hill upon which Clermont is built rises a spring , the water of which is impregnated by means ...
... substance formerly exuded in great abundance from the Puy de la Poix , but the source at present seems exhausted . At the northern base of the hill upon which Clermont is built rises a spring , the water of which is impregnated by means ...
Page 24
... substance is , however , generally more vitreous , like resinite , and often ap- proaches to opal or agate . Its colours are usually yellowish- brown or greyish - blue , and it is sometimes ribboned delicately with stripes of these ...
... substance is , however , generally more vitreous , like resinite , and often ap- proaches to opal or agate . Its colours are usually yellowish- brown or greyish - blue , and it is sometimes ribboned delicately with stripes of these ...
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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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