The Geology and Extinct Volcanos of Central France |
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Page 2
... principal mass of this ele- vated district is composed of primary crystalline rocks , chiefly granite , overlapped on all sides by secondary strata belonging principally to the Jurassic system , which , at its southern extremity ...
... principal mass of this ele- vated district is composed of primary crystalline rocks , chiefly granite , overlapped on all sides by secondary strata belonging principally to the Jurassic system , which , at its southern extremity ...
Page 8
... principal divisions of the lacustrine series may be classed as - 1st , grit and conglomerate , associated with red , blue , and white marls and sandstones ; 2ndly , green and white foliated marls ; 3rdly , limestone or travertin , often ...
... principal divisions of the lacustrine series may be classed as - 1st , grit and conglomerate , associated with red , blue , and white marls and sandstones ; 2ndly , green and white foliated marls ; 3rdly , limestone or travertin , often ...
Page 20
... 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- reous cement . On ...
... 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- reous cement . On ...
Page 24
... principal distinction consists in the far greater bundance of silex associated with its calcareous marls and lime- stone . As in the Limagne formation , the lower beds are arena- ceous , and derived apparently from the detritus of the ...
... principal distinction consists in the far greater bundance of silex associated with its calcareous marls and lime- stone . As in the Limagne formation , the lower beds are arena- ceous , and derived apparently from the detritus of the ...
Page 35
... principal publications that have appeared on this subject from the French geologists are given below . None , however , are of so complete * M. Rozet , Mémoire sur les Volcans de l'Auvergne : Bulletin XIII . , p . 221 . MM . Le Coq et ...
... principal publications that have appeared on this subject from the French geologists are given below . None , however , are of so complete * M. Rozet , Mémoire sur les Volcans de l'Auvergne : Bulletin XIII . , p . 221 . MM . Le Coq et ...
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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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