SOIL PROFILE DESCRIPTIONS (con.) 

 Unit 13. — Argic Pachic CryoboroU (loamy skeletal mixed) 



Parent Material: Schistose rock 



Slope: 26 percent, complex, southwest aspect 



Drainage: Well drained 



Elevation: 8,000 ft. 



Landform: Colluvial slope 

 Erosion: None apparent 

 Vegetation: Aspen, chokecherry, snow- 

 berry, columbine, lupine, yarrow, brome 



Horizon 



Depth 

 (inches) 



Description 



All 0-1 Dark gi-ayish brown (lOYR 4/2) loam, black (lOYR 2/1) moist; weak 



fine platy breaking to weak fine granular structure; soft, friable, 

 slightly sticky, nonplastic; plentiful micro and few fine roots; neutral 

 (pH 7.0); clear smooth boundary. 



A12 1-12 Dark grayish brown ( lOYR 4/2) loam; very dark brown ( lOYR 2/2) 



moist crushed; moderately fine subangular blocky breaking to 

 moderate very fine granular structure; soft, friable, slightly sticky; 

 plentiful micro and few fine roots; slightly acid (pH 6.5); abrupt wavy 

 boundary. 



llBlt 12-21 Brown (lOYR 5/3) gravelly clay loam, brown to dark brown (lOYR 



4/3) moist crushed; moderate fine subangular blocky breaking to 

 moderate very fine subangular blocky structure; slightly hard, firm, 

 sticky, plastic; common thin clay films on ped faces and as bridging 

 and colloid stains on mineral grains; plentiful fine and medium roots; 

 40 percent gravel; medium acid (pH 6.0); gradual wavy boundary. 



llB2t 21-33 Dark brown (7. SYR 4/4) very gravelly clay, dark brown (7.5YR 3/4) 



moist aggregate; strong medium blocky breaking to moderate fine 

 subangular blocky structure; hard, firm, plastic, sticky; many moder- 

 ately thick clay films on ped faces, in pores, and as bridging; plentiful 

 fine and few medium roots; 50 percent gravel; medium acid (pH 6.0); 

 gradual wavy boundary. 



llBSt 33-40 Brown (7. SYR 5/4) very gravelly clay loam; weak medium subangular 



blocky structure; slightly hard, firm, slightly sticky, slightly plastic; 

 few thin clay films as bridging; few fine roots; 75 percent gravel; 

 medium acid (pH 6.0); clear wavy boundary. 



CI 40-48+ Strong brown to brown (7.5YR 5/5) very cobbly sandy loam; massive; 



very friable; very few fine roots; 75 percent cobble and gravel; medium 

 acid (pH 6.0). 



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