. The elements of geology, for popular use : containing a description of the geological formations and mineral resources of the United States. Geology; Geology. HOW TO OBSERVE. 65 Again: a person who first begins to observe geo- logical phenomena is very apt to mistake an under for an upper stratum. For example, suppose (in figure 20) a hill to be covered with vegetable soil, and Fig. a quarry or pit to be made in it near the bottom, as at a, and the stone was discovered to be sandstone ; if another pit was sunk higher up at b, which cut into limestone, it might be supposed, because the l
. The elements of geology, for popular use : containing a description of the geological formations and mineral resources of the United States. Geology; Geology. HOW TO OBSERVE. 65 Again: a person who first begins to observe geo- logical phenomena is very apt to mistake an under for an upper stratum. For example, suppose (in figure 20) a hill to be covered with vegetable soil, and Fig. a quarry or pit to be made in it near the bottom, as at a, and the stone was discovered to be sandstone ; if another pit was sunk higher up at b, which cut into limestone, it might be supposed, because the limestone is met with at a higher level, that it lies over the sandstone stratum, when it is, in reality, below it. And so at c, at the top of the hill, he might suppose that the slate which crops out on the summit was above both the others, when, in fact, it is the lowest of the three in the order of position, though the highest in point of elevation. We often read in geological works of valleys of denudation; these may be explained by the follow- ing figure. Fig. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Lee, Charles A. (Charles Alfred), 1801-1872; Draper, Daniel, 1841-1931, donor. DSI. New-York : Harper & Brothers
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Keywords: ., bookcentury1800, bookpublishernewyorkharperb, booksubjectgeology
