The Geology and Extinct Volcanos of Central France |
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Page xiii
... seen that though I have found it desirable to recast some of the introductory chapters , the body of the work is still the same as was printed in 1826. Indeed on my late visit , I found no reason to alter the conclusions I had come to ...
... seen that though I have found it desirable to recast some of the introductory chapters , the body of the work is still the same as was printed in 1826. Indeed on my late visit , I found no reason to alter the conclusions I had come to ...
Page 6
... seen almost everywhere resting against the granite ranges which , no doubt , formed their shores . The accompany- ing map marks with sufficient accuracy the general disposition and limits of these lacustrine formations . I. LACUSTRINE ...
... seen almost everywhere resting against the granite ranges which , no doubt , formed their shores . The accompany- ing map marks with sufficient accuracy the general disposition and limits of these lacustrine formations . I. LACUSTRINE ...
Page 8
... seen the lowest arenaceous beds are usually found to lean against the granite , sometimes at a considerable angle . The principal divisions of the lacustrine series may be classed as - 1st , grit and conglomerate , associated with red ...
... seen the lowest arenaceous beds are usually found to lean against the granite , sometimes at a considerable angle . The principal divisions of the lacustrine series may be classed as - 1st , grit and conglomerate , associated with red ...
Page 9
... seen to decompose into an alluvium very similar to these tertiary sands and marls . The calcareous element , where it occurs , was , no doubt , added from the interior of the primary crystalline rocks , whence even now issue many ...
... seen to decompose into an alluvium very similar to these tertiary sands and marls . The calcareous element , where it occurs , was , no doubt , added from the interior of the primary crystalline rocks , whence even now issue many ...
Page 11
... seen sometimes to form ranges of concretionary nodules , at others continuous beds , one over another , with layers of the foliated marls interposed . It is well known that certain varieties of the Phryganea ( or caddis - fly ) are in ...
... seen sometimes to form ranges of concretionary nodules , at others continuous beds , one over another , with layers of the foliated marls interposed . It is well known that certain varieties of the Phryganea ( or caddis - fly ) are in ...
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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...