. Principles of agricultural chemistry [microform] . ivides the United States^ Bulletin No. 55. ORIGIN 01^ SOILS 75 into thirteen provinces, based chiefly on climate, origin and topo-graphy of the soils. These are better shown in the map thandescribed. Two great divisions are based on climate; first, humid,and second, arid and semi-arid. The soil provinces are as follows:Humid —i. Atlantic and Gulf Coastal Plains.—Theseconsist of a belt of land narrow in New Jersey but much widertowards the south. The surface is a plain cut into hills andvalleys by rivers, about 200 to 300 feet above
. Principles of agricultural chemistry [microform] . ivides the United States^ Bulletin No. 55. ORIGIN 01^ SOILS 75 into thirteen provinces, based chiefly on climate, origin and topo-graphy of the soils. These are better shown in the map thandescribed. Two great divisions are based on climate; first, humid,and second, arid and semi-arid. The soil provinces are as follows:Humid —i. Atlantic and Gulf Coastal Plains.—Theseconsist of a belt of land narrow in New Jersey but much widertowards the south. The surface is a plain cut into hills andvalleys by rivers, about 200 to 300 feet above sea level along theinner margin, but nearer the coast it has many areas with deficientdrainage. The soils are made up of gravels, sands, and sandyclays. The deposits on the Atlantic coast are derived from thePiedmont Plateau through oceanic agencies, while the deposits onthe gulf coast are derived from material transported from glacialdeposits and from the western plains. There are also some soilsderived from limestone deposits. ^^^•trikv,;^. Fig. 23.—Shell rock, Florida. 2. Piedmont Plateau.—This area lies between the coastal plainand the Appalachian Mountains, and is most extensive in Virginia,North Carolina, South Carolina, and Georgia. The altitudevaries from 300 to over 1,000 feet above sea level. These soilsare derived largely from the weathering of igneous andmetamorphic rocks in place. The prevailing series of these soilsare the Cecil series and the Chester series. Both these seriesusually contain mica and quartz. 76 PRINCIPIvES OF AGRICUI^TURAI, CHEMISTRY 3. Appalachian Mountains and Allegheny Plateau.—The soilsof the eastern ranges of these mountains are of igneous ormetamorphic origin, while the western ranges and the Alleghenyplateau are of sedimentary origin. General farming is notpracticed in a large part of this area on account of the unevennessof its topography. The land is, however, well suited to grazingand fruit growing. 4. Limestone Valleys and
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