The Elements of Geology: Adapted to the Use of Schools and Colleges

abundant accumulation action amount animal argillaceous argillaceous slate basalt become carbonate carboniferous causes change of level character clay climate color consists contains coral cretaceous crust crystalline denudation deposited depth dikes division earth earthquake earthy matter effect elevation eruption Europe evidence exist extend felspar force formation fossils fracture furnished geological glacier gneiss granite greensand heat Hence hornblende hundred feet Hypersthene igneous igneous rocks illustrations instances islands land lava layers lignite limestone marine currents mass materials melted metamorphic metamorphic rocks mica miles mineral mountain nearly occur ocean Old Red Sandstone oölite particles peculiar phenomena portion present principal probably produced quartz red sandstone regions river sand School SECTION sediment sedimentary shales silurian slate solid solidified species specific gravity strata stratified rocks structure subsidence substances suppose surface temperature tertiary period thickness thousand feet tion valley vegetable veins volcanic rocks volume