116 Classification of the Soils – Grousehill Series

Classification of the Soils
Grousehill Series

 Depth class: Moderately deep to a duripan (fig. 10)

Drainage class: Moderately well drained

Permeability: Moderate

Position on landscape: Ridges and benches

Parent material: Ash over glacial till

Slope range: 0 to 35 percent

Elevation: 4,500 to 7,000 feet

Average annual precipitation: 45 to 70 inches

Average annual air temperature: 38 to 42 degrees F

Frost-free period: 10 to 35 days

 Taxonomic class: Medial-skeletal, amorphic Typic Duricryands

 Typical Pedon

 Oi—0 to 3 inches; slightly decomposed needle litter; abrupt wavy boundary.

 index.16

Figure 10.—Typical profile of a Grousehill soil. Measurements on tape are in feet.

 A—3 to 10 inches; dark brown (7.5YR 3/3) gravelly medial loam, yellowish brown (10YR 5/4) dry; weak fine granular structure; soft, very friable, nonsticky and slightly plastic; many very fine, fine, and medium roots and common coarse roots; many very fine interstitial pores; 10 percent rounded andesite gravel, 5 percent rounded andesite cobbles, and 5 percent pumice paragravel; slightly acid (pH 6.4); clear wavy boundary.

Bw1—10 to 31 inches; dark brown (7.5YR 3/4) very cobbly medial loam, brown (7.5YR 5/4) dry; weak very fine subangular blocky structure; soft, very friable, nonsticky and slightly plastic; many fine and medium roots and common coarse roots; many very fine interstitial pores; 10 percent andesite gravel, 30 percent rounded andesite cobbles, 15 percent rounded andesite stones, and 15 percent pumice paragravel; slightly acid (pH 6.4); clear wavy boundary.

 Bw2—31 to 39 inches; very dark grayish brown (10YR 3/2) very cobbly medial loam, yellowish brown (10YR 5/4) dry; weak very fine subangular blocky structure; slightly hard, friable, slightly sticky and slightly plastic; common medium roots and few fine and coarse roots; many very fine interstitial pores; 10 percent andesite gravel and 30 percent rounded andesite cobbles; slightly acid (pH 6.2); abrupt wavy boundary.

Bqm—39 to 56 inches; dark gray (10YR 4/1) moderately cemented duripan, light gray (10YR 7/1) dry; massive; extremely hard, slightly rigid.

 Typical Pedon Location

 Map unit in which located: Grousehill gravelly medial loam, 0 to 25 percent slopes

Location in park: About 2.5 miles north of State Highway 62 and 1/4 mile east of park boundary; 558994 meters easting and 4753267 meters northing, UTM Zone 10T, NAD 27

 Range in Characteristics

 Profile:

Depth to moderately cemented duripan—20 to 40 inches

Shape of rock fragments—round

Content of clay—15 to 25 percent

Depth to perched water table—28 to 38 inches in November through July

A horizon:

Hue—10YR or 7.5YR

Value—2 to 4 moist, 4 to 6 dry

Chroma—2 to 4 moist or dry

Content of rock fragments—10 to 35 percent

Content of pumice paragravel—0 to 15 percent

Bw horizon:

Hue—10YR or 7.5YR

Value—3 or 4 moist, 4 to 6 dry

Chroma—3 or 4 moist or dry

Texture—medial loam or medial sandy loam

Content of rock fragments—35 to 70 percent

Content of pumice paragravel—0 to 20 percent

Bqm horizon:

Hue—10YR or 7.5YR

Value—3 or 4 moist, 4 to 7 dry

Chroma—1 to 4 moist or dry

Content of rock fragments—35 to 60 percent

Grousehill Taxadjunct

Depth class: Deep to a duripan

Drainage class: Moderately well drained

Permeability: Moderate

Position on landscape: Drainageways on mountains

Parent material: Ash over glacial till

Slope range: 0 to 5 percent

Elevation: 4,000 to 5,500 feet

Average annual precipitation: 50 to 70 inches

Average annual air temperature: 40 to 42 degrees F

Frost-free period: 10 to 50 days

 Taxonomic class: Medial-skeletal, amorphic Aquic Haplocryands

 Typical Pedon

 A1—0 to 2 inches; very dark brown (10YR 2/2) ashy loamy sand, dark brown (10YR 3/3) dry; moderate very fine granular structure; soft, very friable, nonsticky and nonplastic; many very fine roots; many very fine interstitial pores; moderately acid (pH 6.0); clear smooth boundary.

A2—2 to 12 inches; very dark brown (10YR 2/2) ashy sandy loam, yellowish brown (10YR 5/4) dry; moderate fine subangular blocky structure; soft, very friable, nonsticky and nonplastic; many very fine and fine roots and common medium roots; many very fine interstitial pores; 5 percent andesite gravel; moderately acid (pH 6.0); clear smooth boundary.

2Bw1—12 to 30 inches; dark grayish brown (10YR 4/2) very gravelly medial loam, light brownish gray (10YR 6/2) dry; weak fine subangular blocky structure; slightly hard, friable, slightly sticky and slightly plastic; many very fine and fine roots; common fine dendritic tubular pores; 20 percent andesite gravel and 15 percent rounded andesite cobbles; moderately acid (pH 6.0); clear smooth boundary.

2Bw2—30 to 36 inches; brown (10YR 4/3) very gravelly medial clay loam, pale brown (10YR 6/3) dry; moderate medium subangular blocky structure; hard, friable, slightly sticky and slightly plastic; many fine roots; few fine dendritic tubular pores; 20 percent andesite gravel, 15 percent rounded andesite cobbles, and 5 percent rounded andesite stones; few faint medium brown (10YR 5/3) iron depletions and common very fine distinct strong brown (7.5YR 4/6) iron concentrations; moderately acid (pH 6.0); clear irregular boundary.

2BC—36 to 45 inches; brown (10YR 4/3) very gravelly medial sandy clay loam, pale brown (10YR 6/3) dry; moderate medium subangular blocky structure; hard, friable, slightly sticky and slightly plastic; many fine roots; few fine dendritic tubular pores; 30 percent andesite gravel, 10 percent rounded andesite cobbles, and 5 percent rounded andesite stones; few faint medium brown (10YR 5/3) iron depletions and common very fine distinct strong brown (7.5YR 4/6) iron concentrations; moderately acid (pH 6.0); clear irregular boundary.

2Bqm—45 to 60 inches; brown (10YR 4/3) moderately cemented duripan, light brownish gray (10YR 6/2) dry; massive; very hard, slightly rigid; 35 percent andesite gravel, 15 percent rounded andesite cobbles, and 10 percent rounded andesite stones.

 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 in “Poison Meadows”; 558656 meters easting and 4752907 meters northing, UTM Zone 10T, NAD 27

 Range in Characteristics

 Profile:

Depth to moderately cemented duripan—40 to 60 inches

Depth to bedrock—more than 60 inches

Depth to redoximorphic features—20 to 30 inches

Content of clay—10 to 28 percent

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

A horizon:

Hue—10YR or 7.5YR

Value—2 to 4 moist, 3 to 6 dry

Chroma—2 or 3 moist or dry

Content of gravel—0 to 15 percent

Content of cobbles—0 to 10 percent

2Bw and 2BC horizons:

Hue—10YR or 7.5YR

Value—3 or 4 moist, 6 or 7 dry

Chroma—2 to 4 moist or dry

Content of rock fragments—35 to 70 percent

Content of gravel—15 to 50 percent

Content of cobbles—0 to 25 percent

Content of stones—0 to 15 percent

2Bqm horizon:

Hue—10YR or 7.5YR

Value—3 or 4 moist, 4 to 7 dry

Chroma—1 to 4 moist or dry

Content of gravel—15 to 50 percent

Content of cobbles—0 to 25 percent

Content of stones—0 to 15 percent

Taxadjunct Features

The Grousehill soil in areas of Grousehill-Racing complex, 0 to 5 percent slopes, is a taxadjunct to the Grousehill series because the duripan is at a depth of 40 to 60 inches and redoximorphic features are in the upper 1 meter.

 

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