The Geology and Extinct Volcanos of Central France |
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Page 6
... thickness of several hundred feet . But the lakes have long since been drained - probably through the effect of some of the subterranean convulsions of which this country has evidently been the theatre ; and these lacustrine strata have ...
... thickness of several hundred feet . But the lakes have long since been drained - probably through the effect of some of the subterranean convulsions of which this country has evidently been the theatre ; and these lacustrine strata have ...
Page 10
... thickness of an inch . 3. Interstratified with the marls we find thick beds of an oolitic limestone resembling our Bath stone in colour and struc- ture , and , like it , acquiring greater hardness on exposure to the air . At Gannat and ...
... thickness of an inch . 3. Interstratified with the marls we find thick beds of an oolitic limestone resembling our Bath stone in colour and struc- ture , and , like it , acquiring greater hardness on exposure to the air . At Gannat and ...
Page 11
... thickness of several hundred feet with the more ordinary marls . The surfaces of these beds are usually mammillated or ... thick appear to have covered very many square miles - originally , perhaps , indeed the whole plain СНАР . ІІ . 11 ...
... thickness of several hundred feet with the more ordinary marls . The surfaces of these beds are usually mammillated or ... thick appear to have covered very many square miles - originally , perhaps , indeed the whole plain СНАР . ІІ . 11 ...
Page 16
... thick of a coarse - grained limestone of an ochreous yellow colour and earthy fracture , without any visible admixture of volcanic matter . It contains the casts of numerous shells , Planorbes , Helices , Lymnei , the shells being often ...
... thick of a coarse - grained limestone of an ochreous yellow colour and earthy fracture , without any visible admixture of volcanic matter . It contains the casts of numerous shells , Planorbes , Helices , Lymnei , the shells being often ...
Page 17
... thick bed which contains much volcanic matter , and is in fact a basaltic breccia , mixed with calcareous particles . It is compact , and seems at a distance irregularly columnar , as is the superimposed basalt . Here we have ...
... thick bed which contains much volcanic matter , and is in fact a basaltic breccia , mixed with calcareous particles . It is compact , and seems at a distance irregularly columnar , as is the superimposed basalt . Here we have ...
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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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Page 206 - ... been completed. There was first a period when the spacious lakes, of which we still may trace the boundaries, lay at the foot of mountains of moderate elevation, unbroken by the bold peaks and precipices of Mont d'Or, and unadorned by the picturesque outline of the Puy de Dome, or of the volcanic cones and craters now covering the granitic platform. During this earlier scene of repose, deltas were slowly formed ; beds of marl and sand several hundred feet thick deposited; siliceous and calcareous...