The Geology and Extinct Volcanos of Central France |
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Page 6
... evidently been the theatre ; and these lacustrine strata have been cut through , worn down , and degraded by the usual denuding agencies , pluvial and fluviatile , until but small portions of them remain to tell the tale of their former ...
... evidently been the theatre ; and these lacustrine strata have been cut through , worn down , and degraded by the usual denuding agencies , pluvial and fluviatile , until but small portions of them remain to tell the tale of their former ...
Page 7
... evidently reached some way up the valley of the Loire from the junction of that river and the Allier to the neighbourhood of Roanne . The lower levels of this great valley- plain are for the most part superficially covered with alluvium ...
... evidently reached some way up the valley of the Loire from the junction of that river and the Allier to the neighbourhood of Roanne . The lower levels of this great valley- plain are for the most part superficially covered with alluvium ...
Page 8
... evidently derived . Some beds consist of a conglomerate of worn pebbles and fragments of granite , gneiss , mica - schist , porphyry , the rocks of the adjoining elevated district , but without the admix- ture of basaltic or any other ...
... evidently derived . Some beds consist of a conglomerate of worn pebbles and fragments of granite , gneiss , mica - schist , porphyry , the rocks of the adjoining elevated district , but without the admix- ture of basaltic or any other ...
Page 9
... evidently formed in situ from the disintegrated materials of the granite on which they rest , and from which they are scarcely to be distinguished . The cement is generally siliceous , and the resulting rock is some- times hard enough ...
... evidently formed in situ from the disintegrated materials of the granite on which they rest , and from which they are scarcely to be distinguished . The cement is generally siliceous , and the resulting rock is some- times hard enough ...
Page 20
... evidently occupied the vesicles formerly 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 ...
... evidently occupied the vesicles formerly 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 ...
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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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