The Geology and Extinct Volcanos of Central France |
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Page x
... portion of their country than they had previously given to it . And I have been gratified to find many of the most trust- worthy among them put forward views coinciding with * See last note . my own upon the several problems which there ...
... portion of their country than they had previously given to it . And I have been gratified to find many of the most trust- worthy among them put forward views coinciding with * See last note . my own upon the several problems which there ...
Page xiii
... portion of this work either has as yet been made public . Under these circumstances , none of the publications , whether of French or English writers , which have yet appeared can be considered to afford that general view or detailed ...
... portion of this work either has as yet been made public . Under these circumstances , none of the publications , whether of French or English writers , which have yet appeared can be considered to afford that general view or detailed ...
Page 1
... portions , of which the northern may be considered as a vast plain , whose waters flow gently towards the north and west through the Seine and the lower Loire . South of this line the surface continues to rise with a gradual slope , so ...
... portions , of which the northern may be considered as a vast plain , whose waters flow gently towards the north and west through the Seine and the lower Loire . South of this line the surface continues to rise with a gradual slope , so ...
Page 6
... portions of them remain to tell the tale of their former enormous development . The original boundaries of these several lakes , though not to be laid down with perfect accuracy , may be more easily recognised than is usually the case ...
... portions of them remain to tell the tale of their former enormous development . The original boundaries of these several lakes , though not to be laid down with perfect accuracy , may be more easily recognised than is usually the case ...
Page 16
... portion of volcanic ashes contained in their several zones . Where this proportion is considerable the rock generally has the more compact character and conchoidal fracture ; and by still further increase of the volcanic element it ...
... portion of volcanic ashes contained in their several zones . Where this proportion is considerable the rock generally has the more compact character and conchoidal fracture ; and by still further increase of the volcanic element it ...
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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...