The Geology and Extinct Volcanos of Central FranceJ. Murray, 1858 - 258 psl. |
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17 psl.
... columnar , as is the superimposed basalt . Here we have unquestionable proof that volcanic eruptions of basaltic lava and scoriæ occurred within or on the banks of the . freshwater lake of the Limagne long before it had ceased to ...
... columnar , as is the superimposed basalt . Here we have unquestionable proof that volcanic eruptions of basaltic lava and scoriæ occurred within or on the banks of the . freshwater lake of the Limagne long before it had ceased to ...
50 psl.
... columnar , at the foot of which is seen a contiguous crater of eruption . The resemblance of this to the Puy de Dôme , rising from the crater of the Petit Puy , is complete . In Hungary also , and elsewhere , tra- chytic domes are ...
... columnar , at the foot of which is seen a contiguous crater of eruption . The resemblance of this to the Puy de Dôme , rising from the crater of the Petit Puy , is complete . In Hungary also , and elsewhere , tra- chytic domes are ...
58 psl.
... columns , the lower portions of which are straight and well formed , the upper twisted into various curves , and less regularly polygonal . The wall of lava is about fifty feet high , and the columnar division is prolonged incompletely ...
... columns , the lower portions of which are straight and well formed , the upper twisted into various curves , and less regularly polygonal . The wall of lava is about fifty feet high , and the columnar division is prolonged incompletely ...
91 psl.
... columnar configuration may be observed . 46. Puy de Las Solas or de la Gravouse . This cone encloses a widely breached crater . Its steep walls of black and crumbling scoria half surround an abyss , which almost seems still to vomit ...
... columnar configuration may be observed . 46. Puy de Las Solas or de la Gravouse . This cone encloses a widely breached crater . Its steep walls of black and crumbling scoria half surround an abyss , which almost seems still to vomit ...
92 psl.
... columnar groups of basaltic plateaux . † The Cheire of La Vache , & c . , is particularly ragged and bristling , as indeed are those of all the puys of the southern extremity of the chain , —a character they owe to the prevalence of ...
... columnar groups of basaltic plateaux . † The Cheire of La Vache , & c . , is particularly ragged and bristling , as indeed are those of all the puys of the southern extremity of the chain , —a character they owe to the prevalence of ...
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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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206 psl. - ... 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...