The Geology and Extinct Volcanos of Central France |
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Page 9
... rest , and from which they are scarcely to be distinguished . The cement is generally siliceous , and the resulting rock is some- times hard enough to be used for millstones . At other times the cementing matter is calcareous , and the ...
... rest , and from which they are scarcely to be distinguished . The cement is generally siliceous , and the resulting rock is some- times hard enough to be used for millstones . At other times the cementing matter is calcareous , and the ...
Page 16
... rest diminishing in size in proportion to their distance from thence . These beds dip rapidly below the level of the river , and are covered by- 2. A bed about 4 feet thick of a coarse - grained limestone of an ochreous yellow colour ...
... rest diminishing in size in proportion to their distance from thence . These beds dip rapidly below the level of the river , and are covered by- 2. A bed about 4 feet thick of a coarse - grained limestone of an ochreous yellow colour ...
Page 17
... rests imme- diately on a thick bed which contains much volcanic matter , and is in fact a basaltic breccia , mixed with calcareous particles . It is compact , and seems at a distance irregularly columnar , as is the superimposed basalt ...
... rests imme- diately on a thick bed which contains much volcanic matter , and is in fact a basaltic breccia , mixed with calcareous particles . It is compact , and seems at a distance irregularly columnar , as is the superimposed basalt ...
Page 24
... rest . The upper series consists of calcareous and siliceous marls , containing subordinate beds of silex , gypsum , and limestone . The bands of silex often very much resemble in position and aspect the flints of our English chalk ...
... rest . The upper series consists of calcareous and siliceous marls , containing subordinate beds of silex , gypsum , and limestone . The bands of silex often very much resemble in position and aspect the flints of our English chalk ...
Page 48
... rest , the insulated production of a single and local operation , and asserts that this rock shows itself partially on many other points in the vicinity - a fact tending to show that these separate masses of the same substance were once ...
... rest , the insulated production of a single and local operation , and asserts that this rock shows itself partially on many other points in the vicinity - a fact tending to show that these separate masses of the same substance were once ...
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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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