SOIL PROFILE DESCRIPTIONS (con.) 



Unit 20. — Lithic CryoboroU (shallow mixed) 



Parent Material: Medium to fine sandstone and Landform: Residual 



siltstone Erosion: Slight sheet 



Slope: 8-10 percent, complex, south-southwest Vegetation: Big sagebrush, rabbitbrush, 

 aspect lupine, Indian paintbrush, fescue 



Drainage: Well drained 



Elevation: 7,800 ft. 



Horizon 



Depth 

 (inches) 



Description 



Ap 



0-1 



Reddish (5YR 5/2) loam, dark reddish gray f5YR 4/2) moist; weak 

 medium platy breaking to weak very fine granular structure; soft, 

 friable, very few fine roots; slightly effervescent; clear smooth 

 boundary. 



Al 



1-4 



Reddish brown (5YR 5/3) gravelly sandy loam, reddish brown (5YR 

 4/3) moist; weak medium subangular blocky breaking to weak fine 

 granular structure; slightly hard, friable; few micro and plentiful fine 

 and medium roots; 20 percent gravel; slightly effervescent; clear wavy 

 boundary. 



B2t 



4-8 



Red (2.5YR 4/6) cobbly sandy clay loam, dark red (2.5YR 3/6) moist; 

 moderate medium subangular blocky breaking to moderate fine 

 granular structure; hard, firm, sticky, plastic; common thin clay films 

 on ped faces and as bridging; few micro and fine and very few medium 

 roots; 20 percent cobble and gravel; effervescent; clear wavy boundary. 



B3 



8-15 



Red (lOR 5/6) very cobbly loam, red (lOR 4/6) moist; moderate fine 

 subangular blocky structure; slightly hard, friable, slightly sticky, 

 common thin clay films on ped faces and as bridging; plentiful fine 

 and few medium and coarse roots; 75 percent cobble and gravel; 

 effervescent; abrupt irregular boundary. 



R 



15-24 



Well weathered parent rock, noncalcareous; sandy siltstones and thin 

 fissile shale, well fractured, has some translocated clay in fractures and 

 on underside of cobble. 



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