Classification of the Soils
Sunnotch Series
Depth class: Very deep
Drainage class: Somewhat excessively drained
Permeability: Rapid
Position on landscape: Debris flows on mountains
Parent material: Ash and cinders
Slope range: 0 to 45 percent
Elevation: 5,000 to 8,000 feet
Average annual precipitation: 40 to 70 inches
Average annual air temperature: 38 to 42 degrees F
Frost-free period: 0 to 50 days
Taxonomic class: Ashy-skeletal, amorphic Typic Vitricryands
Typical Pedon
Oi—0 to 1 inch; slightly decomposed needle litter; abrupt smooth boundary.
A1—1 inch to 3 inches; very dark brown (10YR 2/2) gravelly ashy sandy loam, very dark grayish brown (10YR 3/2) dry; weak fine and medium granular structure; soft, very friable, nonsticky and nonplastic; few very fine and fine roots; many very fine interstitial pores; 10 percent black cinder gravel, 10 percent andesite gravel, and 10 percent pumice paragravel; moderately acid (pH 5.9); abrupt smooth boundary.
A2—3 to 11 inches; very dark grayish brown (10YR 3/2) ashy loamy sand, brown (10YR 5/3) dry; weak fine granular structure; soft, very friable, nonsticky and nonplastic; many very fine, fine, and medium roots and few coarse roots; many very fine interstitial pores; 5 percent black cinder gravel, 5 percent andesite gravel, and 5 percent pumice paragravel; slightly acid (pH 6.3); clear wavy boundary.
Bw—11 to 25 inches; dark brown (10YR 3/3) very gravelly ashy loamy sand, brown (10YR 5/3) dry; weak medium subangular blocky structure; soft, very friable, nonsticky and nonplastic; many very fine and fine roots and common medium roots; many very fine interstitial pores; 20 percent black cinder gravel, 10 percent red cinder gravel, 10 percent andesite gravel, and 10 percent pumice paragravel; slightly acid (pH 6.4); clear smooth boundary.
2C—25 to 61 inches; dark brown (7.5YR 3/4) very gravelly ashy sand, brown (7.5YR 5/4) dry; single grain; soft, very friable, nonsticky and nonplastic; few fine roots; many very fine interstitial pores; 20 percent black cinder gravel, 10 percent black cinder cobbles, 15 percent andesite gravel, 15 percent pumice paragravel, and 3 percent pumice paracobbles; slightly acid (pH 6.4)
Typical Pedon Location
Map unit in which located: Castlecrest gravelly ashy sandy loam, 2 to 10 percent slopes
Location in park: About 1 mile north of Red Cone Spring and about 350 feet west of Boundary Springs Trail; 565967 meters easting and 4762797 meters northing, UTM Zone 10T, NAD 27; lat. 43o1’0.37″, long. 122o11’29.83″
Range in Characteristics
Profile:
Depth to bedrock—more than 60 inches
Content of rock fragments—averages 35 to 50 percent
Content of pararock fragments—averages 5 to 20 percent
Some pedons may have stone- or boulder-sized cinders on the surface.
Cinders commonly are rounded or subrounded.
A horizon:
Hue—10YR or 7.5YR
Value—2 to 5 moist, 3 to 6 dry
Chroma—2 to 4 moist or dry
Texture—gravelly ashy sandy loam, gravelly ashy loamy sand, ashy sandy loam, and ashy loamy sand
Content of cinder gravel—5 to 20 percent
Content of andesite gravel—5 to 25 percent
Content of pumice paragravel—0 to 20 percent
Bw horizon:
Hue—10YR or 7.5YR
Value—3 or 4 moist, 4 to 6 dry
Chroma—2 to 6 moist or dry
Texture—ashy sandy loam, ashy loamy sand, ashy loamy coarse sand, ashy coarse sand, or ashy sand
Content of cinder gravel—5 to 35 percent
Content of andesite gravel—5 to 20 percent
Content of pumice paragravel—0 to 10 percent
Content of clay—0 to 7 percent
2C horizon:
Hue—10YR, 7.5YR, or 5YR
Value—3 or 4 moist, 5 or 6 dry
Chroma—3 to 6 moist or dry
Texture—ashy loamy sand, ashy loamy coarse sand, ashy coarse sand, or ashy sand
Content of cinder gravel—15 to 40 percent
Content of cinder cobbles—0 to 15 percent
Content of cinders more than 10 inches in diameter—0 to 15 percent
Content of andesite gravel—15 to 60 percent
Content of pumice paragravel—0 to 10 percent
Content of pumice paracobbles—0 to 5 percent
Content of clay—0 to 5 percent
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