LOCATION FIELDS                  AK

Established Series
Rev. MHC/DLM
05/2022

FIELDS SERIES

Depth class: moderately deep
Drainage class: well drained
Landforms: mountains
Parent material: silty eolian deposits over gravelly colluvium and/or till
Elevation: 2,231 to 5,295 feet (680 to 1,614 m)
Slope: 18 to 75 percent
Annual precipitation: 28 to 52 inches (700 to 1,310 mm)
Annual temperature: 25 degrees F (-4 degrees C)
Frost-free period: 50 to 80 days

TAXONOMIC CLASS:

TYPICAL PEDON: Fields silt loam - on a slope of 35 percent under green alder/red current/bluejoint scrub. (All colors are for moist soil)

Oe--0 to 1 inch (0 to 3 cm); very dark brown (10YR 2/2) slightly decomposed plant material; many very fine and fine, medium, and coarse roots; very strongly acid (pH 4.6); clear wavy boundary.

A1--1 to 9 inches (3 to 23 cm); very dark brown (10YR 2/2) silt loam; very friable, nonsticky and nonplastic; many very fine and fine, medium, and coarse roots; very strongly acid (pH 5.0); gradual irregular boundary.

2A2--9 to 18 inches (23 to 46 cm); very dark brown (10YR 2/2) and dark brown (7.5YR 3/3) loam; friable, nonsticky and nonplastic; common very fine and fine and few medium roots; 10 percent gravel; strongly acid (pH 5.5); gradual irregular boundary.

2Bw--18 to 26 inches (46 to 66 cm); dark yellowish brown (10YR 4/4) and dark yellowish brown (10YR 3/4) very cobbly loam; friable, nonsticky and nonplastic; few very fine and fine roots; 20 percent gravel, 15 percent cobbles, 2 percent stones; strongly acid (pH 5.1); gradual wavy boundary.

2C--26 to 36 inches (66 to 91 cm); dark yellowish brown (10YR 3/4) very cobbly loam; friable, nonsticky and nonplastic; 20 percent gravel, 15 percent cobbles, 2 percent stones; moderately acid (pH 5.8); abrupt irregular boundary.

2R--36 to 60 inches (91 to 152 cm); fractured bedrock.

TYPE LOCATION: Delta River Area, Alaska; UTM coordinates: Zone 6, Easting 559958, Northing 7018033.

RANGE IN CHARACTERISTICS:

Soil moisture class: udic
Average annual soil temperature: 32 to 34 degrees F (0.1 to 1 degrees C)
Mean summer soil temperature: 36 to 39 degrees F. (2 to 4 degrees C)
Depth to bedrock (lithic): 22 to 39 inches (56 to 100 cm)
Depth to strongly contrasting textural stratification: 4 to 11 inches (10 to 28 cm)
Coarse fragments in particle size control section (weighted average): 10 to less than 35 percent

Oi horizon:
Colorhue of 2.5YR to 10YR; value of 2 through 4; chroma of 1 to 3
Textureslightly decomposed plant material
Organic matter content65 to 90 percent
Reactionultra acid to very strongly acid

A1 horizon:
Colorhue of 5YR to 10YR; value of 2 or 3; chroma of 1 or 2
Texturemucky silt loam, silt loam
Clay content0 to 10 percent
Silt content55 to 75 percent
Sand content15 to 35 percent
Organic matter content4 to 12 percent
Reactionvery strongly acid to strongly acid

2A2 horizon:
Textureloam; gravelly loam; gravelly sandy loam
Clay content5 to 15 percent
Silt content20 to 50 percent
Sand content40 to 75 percent
Organic matter content3 to 10 percent
Rock fragments0 to 25 percent subangular strongly cemented gravel; 0 to 10 percent subangular strongly cemented cobbles
Reactionvery strongly acid to slightly acid

2Bw horizon:
Colorhue of 7.5YR or 10YR; value of 3 or 4; chroma of 2 to 4
Texturevery cobbly loam, very cobbly sandy loam, very gravelly sandy loam
Clay content5 to 15 percent
Silt content15 to 45 percent
Sand content45 to 75 percent
Rock fragments10 to 30 percent subangular strongly cemented gravel; 2 to 35 percent subangular strongly cemented cobbles; 0 to 20 percent subangular strongly cemented stones
Reactionvery strongly acid to slightly acid

2C horizon:
Colorhue of 2.5Y or 5Y
Texturevery cobbly loam; very cobbly sandy loam; very gravelly sandy loam
Clay content5 to 15 percent
Silt content15 to 45 percent
Sand content45 to 75 percent
Rock fragments10 to 30 percent subangular strongly cemented gravel; 2 to 35 percent subangular strongly cemented cobbles; 0 to 20 percent subangular strongly cemented stones
Reactionvery strongly acid to slightly acid

COMPETING SERIES: These are the Donnel and Gestrin series. Donnel and Gestrin soils lack bedrock between 20 to 40 inches.

GEOGRAPHIC SETTING:
Landforms: mountains
Parent material: silty eolian deposits over gravelly colluvium and/or till
Elevation: 2,231 to 5,295 feet (680 to 1,614 m)
Slope: 18 to 75 percent
Annual precipitation: 28 to 52 inches (700 to 1,310 mm)
Annual temperature: 25 degrees F (-4 degrees C)
Frost-free period: 50 to 80 days

GEOGRAPHICALLY ASSOCIATED SOILS: These include Frostcircle, Minya, and Ogive soils. Frostcircle soils are poorly drained, shallow to deep to permafrost, and occur on mountains and till plains. Minya soils are well drained, shallow, and occur on mountains. Ogive soils are somewhat poorly drained, very deep, and occur on mountains.

DRAINAGE AND PERMEABILITY: Well drained, very high runoff. Saturated hydraulic conductivity is moderately high to high.

USE AND VEGETATION: Used for wildlife habitat and recreation. Native vegetation is green alder/red current/bluejoint scrub.

DISTRIBUTION AND EXTENT: MLRA 228, Interior Alaska Mountains, Alaska. The series is of small extent.

SOIL SURVEY REGIONAL OFFICE (SSRO) RESPONSIBLE: WASILLA, ALASKA

SERIES ESTABLISHED: Delta River Area, Alaska, 2005

REMARKS: Diagnostic features and horizons recognized in this profile include:
Lithic contact: 33 inches. (2R horizon)
Umbric epipedon: 1 to 18 inches. (A1 and 2A2 horizons)
Cambic horizon: 18 to 26 inches. (2Bw horizon)
Lithologic discontinuity: At the upper boundary of A1 horizon
Weighted average coarse-loamy particle size control section: 10 to 36 inches
Temperature regime: cryic

ADDITIONAL DATA:

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National Cooperative Soil Survey
U.S.A.