. Soils, their properties and management . Fio. 4. — Map show-iiig the soil provinces and soil regions of the United States. Bureau Soils. Bui. 96, 1913. GEOLOGICAL CLASSIFICATION OF SOILS 35 of fact, there is probably a greater difference in age be-tween the soils of the Piedmont Plateau and those ofthe Great Plains Region than has elapsed since the latterwere formed. The soils of the Piedmont Plateau havebeen formed mostly from gneiss and schist. In fact,the Piedmont Plateau is the remnant of the old continent,Appalachia, which was in existence in early Cambriantimes. The rocks of the Appala
. Soils, their properties and management . Fio. 4. — Map show-iiig the soil provinces and soil regions of the United States. Bureau Soils. Bui. 96, 1913. GEOLOGICAL CLASSIFICATION OF SOILS 35 of fact, there is probably a greater difference in age be-tween the soils of the Piedmont Plateau and those ofthe Great Plains Region than has elapsed since the latterwere formed. The soils of the Piedmont Plateau havebeen formed mostly from gneiss and schist. In fact,the Piedmont Plateau is the remnant of the old continent,Appalachia, which was in existence in early Cambriantimes. The rocks of the Appalachian Mountains andPlateaus are limestone, sandstone, and shales. The GreatPlains Region presents limestone, sandstone, and shaleof the Cretaceous, Permian, and Carboniferous ages, be-sides much unconsolidated material. The soils of theseprovinces, extending as they do over great areas, varywithin wide limits due to rock formation, climatic con-ditions, and age; yet certain common characteristics,as already pointed out, are exliibited b
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