The Geology and Extinct Volcanos of Central France |
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Page 6
... species of fresh- water mollusks , under such circumstances as to show that they were deposited for the most part in tranquillity along the shores and at the bottom of these basins , until they had accumulated to a thickness of several ...
... species of fresh- water mollusks , under such circumstances as to show that they were deposited for the most part in tranquillity along the shores and at the bottom of these basins , until they had accumulated to a thickness of several ...
Page 11
... species - helices , mytili , planorbes , or other - united by glutinous filaments , and disposed in some sort of order around . These habitations are quitted when the insect's metamorphosis is completed ; and on the banks of rivers or ...
... species - helices , mytili , planorbes , or other - united by glutinous filaments , and disposed in some sort of order around . These habitations are quitted when the insect's metamorphosis is completed ; and on the banks of rivers or ...
Page 12
... species only of mollusks which must have formerly lived and died on the bottom or shores of this extensive lake ! The places where I have observed these characteristic beds best developed are on the hills of Gergovia above Romagnat , at ...
... species only of mollusks which must have formerly lived and died on the bottom or shores of this extensive lake ! The places where I have observed these characteristic beds best developed are on the hills of Gergovia above Romagnat , at ...
Page 13
... species are found in the oldest as in the most recent beds of this formation . Whatever differences occur are such only as are found in the exist- ing fauna , and may be referred to differences in geographical or climatic situation , in ...
... species are found in the oldest as in the most recent beds of this formation . Whatever differences occur are such only as are found in the exist- ing fauna , and may be referred to differences in geographical or climatic situation , in ...
Page 21
... species of peperino , bearing equally the appearance of a violent and intimate union of volcanic fragmentary matter with limestone while yet in a soft state . They enclose ill - defined masses and veins of pure lime- stone , some ...
... species of peperino , bearing equally the appearance of a violent and intimate union of volcanic fragmentary matter with limestone while yet in a soft state . They enclose ill - defined masses and veins of pure lime- stone , some ...
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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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