The Geology and Extinct Volcanos of Central France |
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Page 7
... basalt . The substratum , wherever it shows itself , consists of nearly horizontal strata of sand , sandstone , calcareous marl , clay , or limestone , none of which observe a fixed and invariable order of superposition . Several hills ...
... basalt . The substratum , wherever it shows itself , consists of nearly horizontal strata of sand , sandstone , calcareous marl , clay , or limestone , none of which observe a fixed and invariable order of superposition . Several hills ...
Page 17
... basaltic breccia , mixed with calcareous particles . It is compact , and seems at a distance irregularly columnar , as is the superimposed basalt . Here we have unquestionable proof that volcanic eruptions of basaltic lava and scoriæ ...
... basaltic breccia , mixed with calcareous particles . It is compact , and seems at a distance irregularly columnar , as is the superimposed basalt . Here we have unquestionable proof that volcanic eruptions of basaltic lava and scoriæ ...
Page 18
... basalt and scoriæ , cemented by calcareous spar , and finally to a compact basalt . Such examples are found in the Puys de Crouel and de la Poix ( remarkable for its abundant bitumen ) , at Verthaison , Cour - cour , Pont du Château ...
... basalt and scoriæ , cemented by calcareous spar , and finally to a compact basalt . Such examples are found in the Puys de Crouel and de la Poix ( remarkable for its abundant bitumen ) , at Verthaison , Cour - cour , Pont du Château ...
Page 19
... basalt firmly united by a fine cement of calc spar . It is diffi- cult , while examining this rock , to believe that the basaltic parts are in reality mere fragments , and the impression is strongly excited that its peculiar structure ...
... basalt firmly united by a fine cement of calc spar . It is diffi- cult , while examining this rock , to believe that the basaltic parts are in reality mere fragments , and the impression is strongly excited that its peculiar structure ...
Page 20
... basalt . The latter hill is connected by the base with another of a rather larger size , on which stands the town of Monton , but differs from it in substance . Its principal compo- nent rock is like those already described , a peperino ...
... basalt . The latter hill is connected by the base with another of a rather larger size , on which stands the town of Monton , but differs from it in substance . Its principal compo- nent rock is like those already described , a peperino ...
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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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