Excerpt from The Geological Story Briefly Told: An Introduction to Geology for the General Reader
Geology is eminently an out-door science; for strata, river, oceans, mountains, valleys, volcanoes, cannot be taken into a recitation-room. Sketches and sections serve a good purpose in illustrating the objects of which the science treats, but they do not set aside the necessity of seeing the objects themselves. The reader who has any interest in the subject should therefore go, for aid in his study, to the quarries, bluffs, or ledges of rocks in his vicinity, and all places that illustrate geological operations. At each locality accessible to him he should observe the kinds of rocks that there occur; whether they consist of layers or not; and their positions, whether the layers are horizontal, - the positon they had when made; or whether inclined, - a slope in the beds being evidence of a subterranean movement like that which takes place in mountain-making.
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