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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