The Geology and Extinct Volcanos of Central France |
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Page 2
... compact 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 ...
... compact 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 ...
Page 9
... compact to be quarried for building - stone . They are , like the con- glomerates above mentioned , with which they occasionally alternate , evidently derived for the most part from the degrada- tion of the adjoining granite or gneiss ...
... compact to be quarried for building - stone . They are , like the con- glomerates above mentioned , with which they occasionally alternate , evidently derived for the most part from the degrada- tion of the adjoining granite or gneiss ...
Page 12
... compact earthy limestone of an ochreous yellow colour , and contain large shells of the genera Helix , Planorbis , or Lymneus . The testaceous matter is often replaced by calcareous spar , occa- sionally by bitumen , which appears too ...
... compact earthy limestone of an ochreous yellow colour , and contain large shells of the genera Helix , Planorbis , or Lymneus . The testaceous matter is often replaced by calcareous spar , occa- sionally by bitumen , which appears too ...
Page 15
... Manual , 5th ed . , p . 244 . 1. The lowest visible beds consist of a compact brownish. 1. Cliff on the Banks of the Allier , near Pont du Château , at the base of the Puy de Dallet . CHAP . II . 15 CALCAREO - VOLCANIC STRATA .
... Manual , 5th ed . , p . 244 . 1. The lowest visible beds consist of a compact brownish. 1. Cliff on the Banks of the Allier , near Pont du Château , at the base of the Puy de Dallet . CHAP . II . 15 CALCAREO - VOLCANIC STRATA .
Page 16
... compact , hard , and fine - grained limestone , with a conchoidal fracture , of a deep bluish - black , probably coloured by volcanic ashes . 5. Numerous calcareo - volcanic strata , similar to No. 1 ; some of them being ribboned with ...
... compact , hard , and fine - grained limestone , with a conchoidal fracture , of a deep bluish - black , probably coloured by volcanic ashes . 5. Numerous calcareo - volcanic strata , similar to No. 1 ; some of them being ribboned with ...
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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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