The Geology and Extinct Volcanos of Central France |
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Page 2
... coloured , like those of Baveno . The quartz often also presents beautiful crys- tallizations . The amethysts of Le Vernets , near Issoire , have long been known in commerce . In metals this primary district is not rich . Iron is very ...
... coloured , like those of Baveno . The quartz often also presents beautiful crys- tallizations . The amethysts of Le Vernets , near Issoire , have long been known in commerce . In metals this primary district is not rich . Iron is very ...
Page 10
... colour and struc- ture , and , like it , acquiring greater hardness on exposure to the air . At Gannat and elsewhere this rock contains land - shells and bones of quadrupeds and birds . At Chadrat the oolitic grains are so large as to ...
... colour and struc- ture , and , like it , acquiring greater hardness on exposure to the air . At Gannat and elsewhere this rock contains land - shells and bones of quadrupeds and birds . At Chadrat the oolitic grains are so large as to ...
Page 12
... 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 in veins or crevices of this rock . Some are ...
... 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 in veins or crevices of this rock . Some are ...
Page 16
... colour and earthy fracture , without any visible admixture of volcanic matter . It contains the casts of numerous ... coloured by volcanic ashes . 5. Numerous calcareo - volcanic strata , similar to No. 1 ; some of them being ribboned ...
... colour and earthy fracture , without any visible admixture of volcanic matter . It contains the casts of numerous ... coloured by volcanic ashes . 5. Numerous calcareo - volcanic strata , similar to No. 1 ; some of them being ribboned ...
Page 20
... colour , which has here without doubt burst from below through the calcareous sedimentary beds . Parts of this rock are amygdaloidal , being thickly larded with globules of compact radiated mesotype ; this mineral having evidently ...
... colour , which has here without doubt burst from below through the calcareous sedimentary beds . Parts of this rock are amygdaloidal , being thickly larded with globules of compact radiated mesotype ; this mineral having evidently ...
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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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