. The nature and properties of soils; a college text of edaphology. Soils. 40 NATURE AND PROPEETIES OF SOILS gneiss ^ are generally clayey in nature, although loams and even stony loams may occur if the limestone was sandy or cherty and if the igneous rocks carried much quartz. Di)lo- mites weather more slowly than limestone and often give rise to gravelly and stony types. Sandstone of course pro- duces sandy soils, although a soil from an argillaceous sand-. FiG. 8.—Diagram showing the relationship between the underlying rocks and the overlying residual soils. Gettysburg, Pa. (After Emerson.)
. The nature and properties of soils; a college text of edaphology. Soils. 40 NATURE AND PROPEETIES OF SOILS gneiss ^ are generally clayey in nature, although loams and even stony loams may occur if the limestone was sandy or cherty and if the igneous rocks carried much quartz. Di)lo- mites weather more slowly than limestone and often give rise to gravelly and stony types. Sandstone of course pro- duces sandy soils, although a soil from an argillaceous sand-. FiG. 8.—Diagram showing the relationship between the underlying rocks and the overlying residual soils. Gettysburg, Pa. (After Emerson.) stone may be rather heavy. Quartzite and slaty soils are generally shallow, and unfavorable, both in texture and fer- tility, for crop growth. Soils from basic igneous rocks, such as diorite and basalt, generally produce sticky reddish or yel- lowish clays containing little quartz. Rocks that carry con- siderable mica, such as schists, give rise to highly micaceous soils. ^ For a complete discussion of the influence of various parent rocks on the resultant residual soil see Emerson, H. L., Agricultural Geology, Chap. IV J Kew York, 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 Lyon, T. L. (Thomas Lyttleton), 1869-1938; Buckman, Harry Oliver, 1883-. New York, Macmillan
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