Advanced Text-Book of Geology

abundant according accumulations America animals appear applied areas arrangement aspect beds bones calcareous called carboniferous chalk character chemical chiefly clay close coal composed composition consists contain corals crust deposits developed distinct districts drift earth elevation England epoch estuaries evidence existing fact feet felspar fishes formation forms fossil frequent geological geologists globe granite gravel groups heat hence igneous indicate iron islands Italy known lakes land layers less lias lignite lime limestone lines lower marine marls mass matter means mineral mountain nature North numerous occur old red oolite organic origin period physical plants pleistocene portion position present recent red sandstone regarded regions remains respect rivers rocks sand shales shells Silurian South species stone strata structure student surface taking term tertiary thickness tion true upper usually varied variety vegetable volcanic whole