The Geology and Extinct Volcanos of Central France |
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Page 15
... vent , had fallen through the air into the lake at the time the stratum in which they occur was in the condition of very soft calcareous mud . Geologists will probably see in this fact some analogy to the arrangement of the layers of ...
... vent , had fallen through the air into the lake at the time the stratum in which they occur was in the condition of very soft calcareous mud . Geologists will probably see in this fact some analogy to the arrangement of the layers of ...
Page 38
... vents of eruption which broke out at various periods , but by far the greater number since the quiescence of the habitual volcanos above mentioned , upon a zone running nearly north - west and south - east from the north - west of Riom ...
... vents of eruption which broke out at various periods , but by far the greater number since the quiescence of the habitual volcanos above mentioned , upon a zone running nearly north - west and south - east from the north - west of Riom ...
Page 39
... vents of the Vivarais which have broken out in some tributary gorges of the Ardèche . To these indeed should be added a fourth and inde- pendent group , which I have not myself examined , and of which I have not succeeded in finding any ...
... vents of the Vivarais which have broken out in some tributary gorges of the Ardèche . To these indeed should be added a fourth and inde- pendent group , which I have not myself examined , and of which I have not succeeded in finding any ...
Page 41
... vent of the scoriæ and other fragmentary matters pro- jected into the air by the series of ex- plosive discharges of elastic vapour and gases which usually characterises an eruption . The fragments which fall back into the vent are , of ...
... vent of the scoriæ and other fragmentary matters pro- jected into the air by the series of ex- plosive discharges of elastic vapour and gases which usually characterises an eruption . The fragments which fall back into the vent are , of ...
Page 42
... vents has furnished its stream of lava ; but the bases of the cones being sometimes partially cultivated , or covered with forests , it is impossible in every instance to discover this ; nor , for the same reasons , is it easy to trace ...
... vents has furnished its stream of lava ; but the bases of the cones being sometimes partially cultivated , or covered with forests , it is impossible in every instance to discover this ; nor , for the same reasons , is it easy to trace ...
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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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