£. Determine whether the mapped soil series or phase is on the 

 national list of hydric soils (Section 2). CAUTION: It will 

 often be necessary to compare the profile description of the 

 soil with that of the soil series or phase indicated on the 

 soil map to verify that the soil was correctly mapped. This is 

 especially true when the soil survey indicates the presence of 

 inclusions or when the soil is mapped as an association of two 

 or more soil series. 



h. Look for iron and manganese concretions. Look for small 



(>0. 08-inch) aggregates within 3 inches of the soil surface. 

 These are usually black or dark brown and reflect prolonged 

 saturation near the soil surface. 



Sandy soils . 



Look for one of the following indicators in sandy soils: 



a. A layer of organic material above the mineral surface or high 

 organic matter content in the surface horizon (see para- 

 graph 45a of the main text) . This is evidenced by a darker 

 color of the surface layer due to organic matter interspersed 

 among or adhering to the sand particles. This is not observed 

 in upland soils due to associated aerobic conditions. 



b. Streaking of subsurface horizons (see paragraph 45£ of the main 

 text). Look for dark vertical streaks in subsurface horizons. 

 These streaks represent organic matter being moved downward in 

 the profile. When soil is rubbed between the fingers, the 

 organic matter will leave a dark stain on the fingers. 



c. Organic pans (see paragraph 45b of the main text). This is 

 evidenced by a thin layer of hardened soil at a depth of 12 to 

 30 inches below the mineral surface. 



D4 



