Classification of the Soils

Collier Series

 Depth class: Very deep (fig. 9)

Drainage class: Somewhat excessively drained

Permeability: Rapid

Position on landscape: Ashflows

Parent material: Ash and cinders

Slope range: 0 to 80 percent

Elevation: 4,000 to 6,000 feet

Average annual precipitation: 20 to 60 inches

Average annual air temperature: 41 to 44 degrees F

Frost-free period: 0 to 50 days

Taxonomic class: Ashy, glassy Xeric Vitricryands

 Typical Pedon

 Oi—0 to 1 inch; slightly decomposed needle litter.

A—1 inch to 5 inches; very dark brown (10YR 2/2) ashy sandy loam, dark yellowish brown (10YR 4/4) dry; weak fine granular structure; loose, very friable, nonsticky and nonplastic; many very fine and fine roots and common medium roots; many very fine interstitial pores; 5 percent pumice paragravel and 3 percent hard gravel; slightly acid (pH 6.1); clear wavy boundary.

BA—5 to 12 inches; dark brown (7.5YR 3/2) ashy loamy sand, brown (7.5YR 5/2) dry; weak fine subangular blocky structure; loose, nonsticky and nonplastic; many very fine and fine roots; many fine interstitial pores; 5 percent pumice paragravel and 3 percent hard gravel; slightly acid (pH 6.1); clear wavy boundary.

Bw—12 to 23 inches; brown (7.5YR 4/2) paragravelly ashy loamy sand, light brown (7.5YR 6/3) dry; weak fine subangular blocky structure; loose, nonsticky and nonplastic; few very fine roots; many fine interstitial pores; 15 percent pumice paragravel and 8 percent hard gravel; slightly acid (pH 6.1); clear wavy boundary.

Figure 9.—Typical profile of a Collier soil. Measurements on tape are in centimeters.

C—23 to 62 inches; brown (7.5YR 4/4) paragravelly ashy sand, light brown (7.5YR 6/4) dry; single grain; slightly hard, very friable, nonsticky and nonplastic; few fine roots; many fine interstitial pores; 15 percent pumice paragravel and 8 percent cinder gravel; neutral (pH 6.6).

 Typical Pedon Location

 Map unit in which located: Collier ashy loamy sand, 0 to 7 percent slopes

Location in park: About 2 miles west of Sharps Peak; 579858 meters easting and 4760342 meters northing, UTM Zone 10T, NAD 27; lat. 42o59’36.00″ N., long. 122o01’17.48″ W.

 Range in Characteristics

 Profile:

Depth to bedrock—more than 60 inches

Thickness of solum—14 to 30 inches

Average content of rock fragments—less than 35 percent

Hue—5YR, 7.5YR, or 10YR

A horizon:

Value—2 or 3 moist, 3 to 5 dry

Chroma—2 or 3 moist or dry

Texture—ashy sandy loam, ashy loamy sand, and very gravelly ashy loamy sand

Content of cinder gravel—0 to 15 percent

Content of pumice paragravel—0 to 15 percent

Content of andesite gravel—0 to 15 percent

Content of clay—0 to 3 percent

Bw horizon:

Value—3 or 4 moist, 4 or 5 dry

Chroma—3 or 4 moist or dry

Texture—ashy loamy sand or ashy sandy loam

Content of cinder gravel—0 to 15 percent

Content of pumice paragravel—0 to 20 percent

Content of andesite gravel—0 to 10 percent

Content of clay—0 to 5 percent

C horizon:

Value—3 or 4 moist, 4 or 5 dry

Chroma—2 to 4 moist or dry

Texture—ashy loamy sand or ashy sand

Content of cinder gravel—0 to 20 percent

Content of pumice paragravel—0 to 25 percent

Content of andesite gravel—0 to 10 percent

Content of cinder cobbles—0 to 5 percent

Content of cinder stones—0 to 5 percent

Content of clay—0 to 2 percent

 

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