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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