The Geology and Extinct Volcanos of Central France |
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Page 2
... felspar , and of felspar porphyry . The felspar of the granitic rocks sometimes takes the form of large twin crystals , occasionally rose - coloured , like those of Baveno . The quartz often also presents beautiful crys- tallizations ...
... felspar , and of felspar porphyry . The felspar of the granitic rocks sometimes takes the form of large twin crystals , occasionally rose - coloured , like those of Baveno . The quartz often also presents beautiful crys- tallizations ...
Page 9
... felspar , evidently formed in situ from the disintegrated materials of the granite on which they rest , and from which they are scarcely to be distinguished . The cement is generally siliceous , and the resulting rock is some- times ...
... felspar , evidently formed in situ from the disintegrated materials of the granite on which they rest , and from which they are scarcely to be distinguished . The cement is generally siliceous , and the resulting rock is some- times ...
Page 10
... felspar , mica , and hornblende , produce aluminous clay , and , by admixture with carbonate of lime from the springs , calcareous marl . This fine sediment would naturally be carried out to a greater distance from the shore than the ...
... felspar , mica , and hornblende , produce aluminous clay , and , by admixture with carbonate of lime from the springs , calcareous marl . This fine sediment would naturally be carried out to a greater distance from the shore than the ...
Page 45
... felspar , & c . , which they contain . The considerable dilapidation of some cones , and the elevated position of their currents relatively to the surrounding soil , are less fallible signs of a superior antiquity , more particularly ...
... felspar , & c . , which they contain . The considerable dilapidation of some cones , and the elevated position of their currents relatively to the surrounding soil , are less fallible signs of a superior antiquity , more particularly ...
Page 46
... felspar , sprinkled with still smaller grains of augite , and occasional pallets of mica . These elements are partly separated from each other by minute pores , which render the substance rough to the touch , light , spongy , and ...
... felspar , sprinkled with still smaller grains of augite , and occasional pallets of mica . These elements are partly separated from each other by minute pores , which render the substance rough to the touch , light , spongy , and ...
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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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