원문 (영어)

PART I. The Drift CHAPTER I. THE CHARACTERISTICS OF THE DRIFT. READER,--Let us reason together:-- What do we dwell on? The earth. What part of the earth? The latest formations, of course. We live upon the top of a mighty series of stratified rocks, laid down in the water of ancient seas and lakes, during incalculable ages, said, by geologists, to be from ten to twenty miles in thickness. Think of that! Rock piled over rock, from the primeval granite upward, to a height four times greater t