. The elements of geology, for popular use : containing a description of the geological formations and mineral resources of the United States. Geology; Geology. STRATIFICATION. 59 When they are not horizontal, they are said to dip, and sometimes they stand vertically upon their edges. Fig. When strata protrude above the surface of the ground, as at a, they are said to crop out, and the angle at w^hich they incline below the horizon is their dij); the thickness, of course, is the perpendic- ular distance between their upper and under sur- face. Some rocks, particularly slates, are subdi- v
. The elements of geology, for popular use : containing a description of the geological formations and mineral resources of the United States. Geology; Geology. STRATIFICATION. 59 When they are not horizontal, they are said to dip, and sometimes they stand vertically upon their edges. Fig. When strata protrude above the surface of the ground, as at a, they are said to crop out, and the angle at w^hich they incline below the horizon is their dij); the thickness, of course, is the perpendic- ular distance between their upper and under sur- face. Some rocks, particularly slates, are subdi- vided by numerous vertical joints, dividing the whole mass into cubical or rhomboidal masses, as in the following cut: 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. New-York : Harper & Brothers
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Keywords: ., bookcentury1800, bookdecade1840, booksubjectgeology, bookyear1846
