The Soil Profih 



81 



Photo U. S. Soil Conservation Service 



Fig. 3.7. Vertical cut through fine sandy loam supporting blue-stem grass at Red 

 Plains Experiment Station, Guthrie, Oklahoma. 



A Horizon, 0-1.0 ft (0-30 cm): grayish brown fine sandy loam. 

 B Horizon, 1.0-2.5 ft (30-75 cm): reddish sandy clay. 

 C Horizon 2.5-3.2 ft (75-95 cm): weathered parent material. 

 D Horizon below 3.2 ft: laminated sandstone and shale. 



greatly from place to place and change with time in the same region 

 as the soil matures. A varying number of subdivisions of each hori- 

 zon are recognized in different situations with the result that a com- 

 plete analysis of the soil profile becomes very complex. In many 

 soils some of the subdivisions are entirely unrepresented, and in other 

 soils strata of considerable thickness may be uniformly mixed. The 

 general nature of the principal horizons and subdivisions are shown 

 diagrammatically in Fig. 3.8. 



