122 Classification of the Soils – Racing Series

Classification of the Soils
Racing Series

 Depth class: Very deep

Drainage class: Poorly drained

Permeability: Moderate over slow

Position on landscape: Mountain basins

Parent material: Ash over glacial till

Slope range: 0 to 3 percent

Elevation: 4,000 to 5,500 feet

Average annual precipitation: 50 to 70 inches

Average annual air temperature: 38 to 40 degrees F

Frost-free period: 10 to 30 days

Frequency of ponding: Frequent

 Taxonomic class: Fine-loamy, mixed, superactive, nonacid Aquandic Cryaquepts

 Typical Pedon

 Oa—0 to 4 inches; very dark brown (10YR 2/2) muck, very dark grayish brown (10YR 3/2) dry; fibrous; soft, friable, nonsticky and nonplastic; many very fine, fine, and medium roots; many very fine irregular and dendritic tubular pores; moderately acid (pH 6.0); abrupt smooth boundary.

A—4 to 6 inches; grayish brown (10YR 5/2) silt loam, light brownish gray (10YR 6/2) dry; weak fine granular structure; slightly hard, friable, slightly sticky and slightly plastic; many very fine, fine, and medium roots; many medium dendritic tubular pores; few fine distinct strong brown (7.5YR 5/6) iron concentrations; strongly acid (pH 5.5); abrupt wavy boundary.

Bw—6 to 18 inches; light brownish gray (10YR 6/2) ashy very fine sandy loam, light gray (10YR 7/2) dry; weak fine subangular blocky structure; slightly hard, friable, slightly sticky and slightly plastic; many very fine and fine roots; many medium dendritic tubular pores; many coarse prominent light brownish gray (10YR 6/2) iron depletions and common medium prominent strong brown (7.5YR 5/8) iron concentrations; strongly acid (pH 5.5); clear wavy boundary.

Bg1—18 to 28 inches; gray (10YR 5/1) ashy sandy clay loam, light gray (10YR 7/1) dry; moderate medium subangular blocky structure; slightly hard, friable, slightly sticky and slightly plastic; many very fine and fine roots; common medium dendritic tubular pores; many coarse prominent gray (10YR 5/1) iron depletions and common fine distinct strong brown (7.5YR 5/6) iron concentrations; strongly acid (pH 5.5); clear wavy boundary.

Bg2—28 to 34 inches; greenish gray (10Y 5/1) ashy sandy clay loam; moderate medium subangular blocky structure; slightly hard, friable, slightly sticky and slightly plastic; common medium roots; few medium dendritic tubular pores; many coarse prominent gray (10YR 5/1) iron depletions and common fine distinct strong brown (7.5YR 5/6) iron concentrations; 3 percent fine gravel; strongly acid (pH 5.5); clear wavy boundary.

2Bg3—34 to 50 inches; greenish gray (5G 5/1) very gravelly ashy sandy loam; weak medium subangular blocky structure; soft, friable, nonsticky and nonplastic; many fine interstitial pores; many coarse prominent greenish gray (10Y 5/1) iron depletions and common medium distinct strong brown (7.5YR 5/6) iron concentrations; 35 percent gravel; strongly acid (pH 5.5); clear wavy boundary.

3Bq—50 to 60 inches; grayish brown (10YR 5/2) extremely gravelly loamy sand, light gray (10YR 7/2) dry; massive; hard, firm, nonsticky and nonplastic; discontinuous weak cementation; few very fine interstitial pores; 70 percent gravel and 5 percent cobbles; strongly acid (pH 5.5).

 Typical Pedon Location

 Map unit in which located: Grousehill-Racing complex, 0 to 5 percent slopes

Location in park: About 1/4 mile east and 21/2 miles north of State Highway 62, along the western boundary of “Poison Meadows”; 558778 meters easting and 4752920 meters northing, UTM Zone 10T, NAD 27

 Range in Characteristics

 Profile:

Depth to discontinuous weakly cemented substratum—40 to 60 inches

Content of clay—20 to 30 percent

Depth to bedrock—more than 60 inches

Average content of rock fragments in control section—less than 35 percent

Reaction—very strongly acid to moderately acid

Redoximorphic features are throughout the profile.

Oa horizon (where present):

Value—2 or 3 moist or dry

Chroma—0 to 2 moist or dry

A horizon:

Value—2 to 5 moist, 3 to 6 dry

Chroma—2 or 3 moist, 2 to 4 dry

Content of gravel—0 to 5 percent

Bw horizon (where present):

Value—3 to 6 moist, 3 to 7 dry

Chroma—2 or 3 moist, 2 to 4 dry

Texture—ashy very fine sandy loam, ashy sandy loam, or ashy loam

Content of gravel—0 to 5 percent

Bg horizon:

Hue—10YR, 10Y, or 5G

Value—4 to 6 moist, 6 to 8 dry

Chroma—1 or 2 moist or dry

Texture—silt loam, ashy clay loam, or ashy sandy clay loam

Content of gravel—0 to 5 percent

2Bg horizon:

Hue—10YR, 10Y, or 5G

Value—5 or 6 moist, 7 or 8 dry

Chroma—1 or 2 moist or dry

Texture—loam, ashy loam, ashy sandy loam, clay loam, or ashy clay loam

Content of rock fragments—35 to 80 percent

Content of cobbles—0 to 5 percent

3Bq horizon:

Hue—10YR, 10Y, or 5G

Value—5 or 6 moist, 7 or 8 dry

Chroma—1 or 2 moist, 2 or 3 dry

Content of rock fragments—60 to 85 percent

Content of cobbles—0 to 10 percent

Content of clay—5 to 20 percent

Texture—sand, sandy loam, or ashy sandy loam

Cementation—discontinuous and weak

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