CLASSIFICATION BY THE BUREAU OF SOILS 103 



They are unconsolidated, but include certain zones of material 

 which is calcareous and more or less indurated or cemented. 



Amarillo Series. These include chocolate brown to reddish 

 brown soils, with brown to reddish brown subsoils. The subsoil 

 grades into a white or pinkish white calcareous material within 

 three feet of the surface. They are derived from sandstone, shale, 

 limestone, and crystalline rock. More than eleven million acres 

 have been mapped. 



Colorado Series. The soils are of gray to reddish brown color 

 and contain fine quartz and feldspar fragments. The subsoils are 

 reddish brown. They grow vegetables, tree fruits, alfalfa, and 

 melons. 



Dawes Series. The soils are ashy gray to light brown in color, 

 with white to pinkish white subsoils. 



Gannett Series. The soils are light brown, with yellowish 

 sand to light sandy loam subsoils. They are mostly utilized for 

 pasture. 



Greensburg Series. The soils are brown to dark brown in 

 color and the subsoils brown to yellowish brown. The soils are 

 derived mainly from Plains Marl. They are usually treeless and 

 produce wheat, corn, kafir, and sorghum. 



Pratt Series. The soils are brown, with dark reddish brown 

 rather compact sticky subsoils, usually loam to clay loam in tex- 

 ture. They retain water well and under favorable conditions the 

 soils are quite productive, giving good yields of kafir, corn, sorghum, 

 and wheat. Nearly 2,000,000 acres have been mapped. 



Richfield Series. The soils are grayish brown, with grayish 

 brown calcareous subsoils. They are retentive of moisture and 

 produce wheat, corn, alfalfa, and forage crops. More than 8,000,000 

 acres have been mapped. 



Rosebud Series. The surface soils are dark gray to brown. 

 The subsoils arc light colored, almost white, and very calcareous. 

 The topography ranges from undulating to steeply rolling and 

 where badly eroded constitutes " bad land." More than 5,000,000 

 acres have been mapped. 



Zapata Series. The soils have gray calcareous surface, with 

 subsoils of similar color and texture. They have a very low value 

 for agricultiire. They aro used for grazing. 



(6) River Flood Plain Material. These soils are the flood 

 plains and terraces along streams. They occur widely scattered 



