Elements of Geology: Intended for the Use of Students

abundant agency alluvial alluvium America ancient animals appear basaltic beds belong bones calcareous called carbonate of lime carboniferous chalk clay coal coast color consists contain corals cretaceous crust crystalline deposits dikes drift earth elephant elevated England Eocene eruptions Europe exhibits existing extensive extinct feet thick feldspar fishes fissures formations fossil fossiliferous fragments fresh-water genera genus geologists Geology gneiss granite heat hornblende hundred feet hyænas Ichthyosaurus igneous rocks lakes land lava Lias lignite limestone living magnesia marine marls masses mastodon mica miles mineral mountains numerous occur ocean Old Red Sandstone Oolite organic remains oxide of iron period phenomena plants porphyry portion present day quadrupeds quartz recent reptiles resembling river salt sand secondary shales shells silica Silurian skeletons slate soils sometimes species square miles stone strata stratified rocks structure surface Tertiary therion thousand feet tion trap rocks unstratified valleys vegetable veins volcanic Wealden