Elements of Geology, for the Use of Schools

acid action alluvial animals appear arranged basalt become beds bodies bones called carbon causes chalk changes characters classes clay coal color common compact composed considerable containing covered crystalline crystals deposits depth described diluvial direction distinguished dykes earth earthquakes effects eruption existing extensive facts feet feldspar fire formation fossils frequently Geology globe granite ground heat hills hornblende imbedded important iron islands kind known land lava layers lignite limestone lower masses materials melted metals mica miles minerals mountains nature observed occur ocean organic remains origin oxygen particular pass period phenomena plants position present primitive rocks produced quantity quartz red sandstone regular remarkable rise rivers salt sand secondary rocks seen shew sides similar situation slate sometimes springs stone strata structure substances supposed surface tertiary theory thickness tion transition trap United upper variety various veins volcanos