"At the foundation of the understanding of the proper sequential order of rocks and the fossils contained in them lies the principle of superposition . That many rocks are layered and that such rocks commonly bore fossils, were observations made by scores of naturalists from the beginning of man's investigation of the natural phenomena about him. Some rocks were tilted only a little. They could be seen to lie one on top of the other. Other sets were contorted. Their sequential order was more difficult to establish."
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