125 Classification of the Soils – Stirfry Series

Classification of the Soils
Stirfry Series

 Depth class: Very deep

Drainage class: Very poorly drained

Permeability: Moderately rapid

Position on landscape: Drainageways, stream terraces, and seeps on mountains

Parent material: Mossy organic material over ash and pumice

Slope range: 0 to 15 percent

Elevation: 4,100 to 6,500 feet

Average annual precipitation: 25 to 70 inches

Average annual air temperature: 38 to 42 degrees F

Frost-free period: 0 to 50 days

Taxonomic class: Euic Typic Cryosaprists

 Typical Pedon

 Oi—0 to 2 inches; dark brown (7.5YR 3/2) peat; fibrous; soft, very friable, nonsticky and nonplastic; 100 percent nonrubbed sphagnum fiber, 85 percent rubbed fiber; many very fine and fine roots; strongly acid (pH 5.5); clear wavy boundary.

Oe—2 to 8 inches; dark brown (7.5YR 3/2) mucky peat; fibrous; soft, very friable, nonsticky and nonplastic; 90 percent nonrubbed sphagnum fiber, 45 percent rubbed fiber; many very fine and fine roots; strongly acid (pH 5.5); clear wavy boundary.

Oa1—8 to 18 inches; very dark gray (10YR 3/1) muck; fibrous; soft, very friable, nonsticky and nonplastic; 90 percent nonrubbed fiber, 25 percent rubbed fiber; many very fine roots; very strongly acid (pH 5.0); clear wavy boundary.

Oa2—18 to 51 inches; dark brown (7.5YR 3/2) muck; fibrous; soft, very friable, nonsticky and nonplastic; 85 percent nonrubbed fiber, 15 percent rubbed fiber; many very fine, fine, and medium roots; very strongly acid (pH 5.0); abrupt wavy boundary.

2A—51 to 60 inches; black (7.5YR 2.5/1) gravelly ashy very coarse sand, gray (7.5YR 5/1) dry; single grain; loose, nonsticky and nonplastic; many fine interstitial pores; 20 percent andesite gravel; strongly acid (pH 5.5).

 Typical Pedon Location

 Map unit in which located: Mariel-Stirfry complex, 0 to 3 percent slopes

Location in park: Sphagnum Bog; 560930 meters easting and 4760856 meters northing, UTM Zone 10T, NAD 27

 Range in Characteristics

 Profile:

Depth to aquic conditions—0 to 20 inches

Depth to bedrock—more than 60 inches

Depth to water table—less than 6 inches in November

through June and 6 to 12 inches in July through October

Depth to mineral soil—40 to 60 inches

Oi horizon:

Thickness—0 to 20 inches

Percentage of nonrubbed fiber—95 to 100 percent

Percentage of rubbed fiber—75 to 95 percent

Reaction—very strongly acid to moderately acid (pH 4.5 to 6.0)

The Oi horizon is present in areas on microhighs and hummocks, but it is absent in areas on microlows and in depressions.

Oe horizon:

Depth to horizon—0 to 20 inches

Thickness—4 to 20 inches

Hue (nonrubbed)—5YR, 7.5YR, or 10YR dry or moist

Value (nonrubbed)—2 to 4 dry, 2 or 3 moist Chroma (nonrubbed)—1 or 2 dry, 1 to 3 moist Percentage of nonrubbed fiber—60 to 90 percent Percentage of rubbed fiber—20 to 50 percent Reaction—very strongly acid to moderately acid (pH 4.5 to 6.0) Oa horizon:

Depth to horizon—4 to 24 inches

Thickness—30 to 60 inches or more

Hue (nonrubbed)—5YR, 7.5YR, or 10YR

Value (nonrubbed)—2 to 4 dry, 2 or 3 moist

Chroma (nonrubbed)—1 or 2 dry, 1 to 3 moist

Percentage of nonrubbed fiber—20 to 50 percent

Percentage of rubbed fiber—0 to 15 percent

Reaction—very strongly acid to moderately acid (pH 4.5 to 6.0)

2A horizon:

Depth to horizon—51 to 60 inches or more

Texture—ashy loamy coarse sand or ashy coarse sand

Content of paragravel—0 to 25 percent

Content of gravel—0 to 45 percent

 Stirfry Taxadjunct

 Depth class: Very deep

Drainage class: Very poorly drained

Permeability: Moderately rapid

Position on landscape: Drainageways on mountains

Parent material: Mossy organic material over ash, pumice, and andesite fragments

Slope range: 0 to 10 percent

Elevation: 4,500 to 5,500 feet

Average annual precipitation: 50 to 70 inches

Average annual air temperature: 38 to 42 degrees F

Frost-free period: 0 to 50 days

 Taxonomic class: Ashy-skeletal, glassy, euic Terric Cryosaprists

 Typical Pedon

 Oe—0 to 2 inches; dark brown (7.5YR 3/3) peat; fibrous; soft, very friable, nonsticky and nonplastic; 100 percent nonrubbed sphagnum fiber, 85 percent rubbed fiber; many very fine and fine roots; very strongly acid (pH 5.4); clear wavy boundary.

Oa1—2 to 12 inches; very dark brown (10YR 2/2) mucky peat; fibrous; soft, very friable, nonsticky and nonplastic; 90 percent nonrubbed sphagnum fiber, 75 percent rubbed fiber; many very fine and fine roots; very strongly acid (pH 5.4); clear wavy boundary.

Oa2—12 to 26 inches; black (10YR 2/1) mucky peat; fibrous; soft, very friable, nonsticky and nonplastic; 90 percent nonrubbed fiber, 55 percent rubbed fiber; many very fine roots; very strongly acid (pH 5.4); clear wavy boundary.

2C1—26 to 30 inches; dark brown (7.5YR 3/3) mucky ashy sandy loam; single grain; fibrous; soft, very friable, nonsticky and nonplastic; 10 percent nonrubbed fiber, 15 percent rubbed fiber; many very fine, fine, and medium roots; very strongly acid (pH 5.4); clear wavy boundary.

2C2—30 to 60 inches; dark brown (7.5YR 3/3) very gravelly mucky ashy loamy coarse sand; single grain; loose, nonsticky and nonplastic; many fine interstitial pores; 40 percent andesite gravel and 10 percent andesite cobbles; very strongly acid (pH 4.8).

 Typical Pedon Location

Map unit in which located: Stirfry-Grousehill complex, 0 to 10 percent slopes

Location in park: Thousand Springs; 558357 meters easting and 4747464 meters northing, UTM Zone 10T, NAD 27

 Range in Characteristics

 Profile:

Depth to aquic conditions—0 to 20 inches

Depth to bedrock—more than 60 inches

Depth to 2C horizon—20 to 40 inches

Depth to water table—less than 6 inches in November

through June and 6 to 12 inches in July through October

Depth to mineral soil—20 to 40 inches

Oi horizon (where present):

Thickness—0 to 20 inches

Percentage of nonrubbed fiber—95 to 100 percent

Percentage of rubbed fiber—75 to 95 percent

Reaction—very strongly acid to moderately acid (pH 4.5 to 6.0)

The Oi horizon is present in areas on microhighs and hummocks, but it is absent in areas on microlows and in depressions.

Oe horizon:

Depth to horizon—0 to 20 inches

Thickness—4 to 20 inches

Hue (nonrubbed)—5YR, 7.5YR, or 10YR dry or moist

Value (nonrubbed)—2 to 4 dry, 2 or 3 moist

Chroma (nonrubbed)—1 or 2 dry, 1 to 3 moist

Percentage of nonrubbed fiber—60 to 90 percent

Percentage of rubbed fiber—20 to 50 percent

Reaction—very strongly acid to moderately acid (pH 4.5 to 6.0)

Oa horizon:

Depth to horizon—4 to 24 inches

Thickness—30 to 60 inches or more

Hue (nonrubbed)—5YR, 7.5YR, or 10YR

Value (nonrubbed)—2 to 4 dry, 2 or 3 moist

Chroma (nonrubbed)—1 or 2 dry, 1 to 3 moist

Percentage of nonrubbed fiber—20 to 50 percent

Percentage of rubbed fiber—0 to 15 percent

Reaction—very strongly acid to moderately acid (pH 4.5 to 6.0)

2C horizon:

Texture—mucky ashy loamy coarse sand or mucky ashy coarse sand

Content of paragravel—0 to 25 percent

Content of gravel—0 to 60 percent

Content of cobbles—0 to 15 percent

 Taxadjunct Features

 The Stirfry soil in Stirfry-Grousehill complex, 0 to 10 percent slopes, is a taxadjunct to the Stirfry series because mineral soil material is at a depth of 26 inches.

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