The Geology and Extinct Volcanos of Central France |
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Page 7
... fragments have evidently been protected from the destruction that has involved the greater part of the forma- tion by a covering of basalt ; others owe their preservation to a 6 * The compilers of the Carte Géo- logique de la France ...
... fragments have evidently been protected from the destruction that has involved the greater part of the forma- tion by a covering of basalt ; others owe their preservation to a 6 * The compilers of the Carte Géo- logique de la France ...
Page 8
... fragments of granite , gneiss , mica - schist , porphyry , the rocks of the adjoining elevated district , but without the admix- ture of basaltic or any other volcanic rocks . These arenaceous strata are not continuous round the margin ...
... fragments of granite , gneiss , mica - schist , porphyry , the rocks of the adjoining elevated district , but without the admix- ture of basaltic or any other volcanic rocks . These arenaceous strata are not continuous round the margin ...
Page 14
... fragments of basaltic lava , crystals of augite , scoriæ , and volcanic ashes are scattered through some of the undis- turbed limestone - beds , and assume frequently a remarkable disposition , the heavier and larger fragments occupying ...
... fragments of basaltic lava , crystals of augite , scoriæ , and volcanic ashes are scattered through some of the undis- turbed limestone - beds , and assume frequently a remarkable disposition , the heavier and larger fragments occupying ...
Page 15
George Poulett Scrope. the upper parts - suggesting the obvious idea that these fragments , after ejection from a volcanic vent , had fallen through the air into the lake at the time the stratum in which they occur was in the condition ...
George Poulett Scrope. the upper parts - suggesting the obvious idea that these fragments , after ejection from a volcanic vent , had fallen through the air into the lake at the time the stratum in which they occur was in the condition ...
Page 16
... fragments at the bottom , the 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 ...
... fragments at the bottom , the 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 ...
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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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