LOCATION PHELANNA                AK

Established Series
Rev. MHC/DLM
02/2022

PHELANNA SERIES

Depth class: very deep
Drainage class: poorly drained
Landforms: swales on mountains; swales on till plains
Parent material: silty eolian deposits over gravelly till
Elevation: 2,782 to 3,442 feet (848 to 1,049 m)
Slope: 2 to 12 percent
Annual precipitation: 28 to 35 inches (712 to 894 mm)
Annual temperature: 25 degrees F (-4 degrees C)
Frost-free period: 50 to 70 days

TAXONOMIC CLASS: Coarse-loamy, mixed, superactive, nonacid, subgelic Humic Gelaquepts

TYPICAL PEDON: Phelanna mucky silt loam - on a slope of 8 percent under diamondleadf willow scrub, moist. (All colors are for moist soil)

Oe--0 to 3 inches (0 to 8 cm); black (10YR 2/1) mucky peat; many very fine and fine, many medium and many coarse roots; strongly acid (pH 5.4); clear smooth boundary.

A1--3 to 11 inches (8 to 28 cm); very dark brown (10YR 2/2) silt loam; weak fine subangular blocky structure; very friable, nonsticky and nonplastic; many very fine and fine and many medium roots; strongly acid (pH 5.5); gradual smooth boundary.

A2--11 to 19 inches (28 to 48 cm); dark brown (10YR 3/3) silt loam; weak medium subangular blocky structure; very friable, nonsticky and nonplastic; few very fine and fine roots; strongly acid (pH 5.5); gradual smooth boundary.

2C--19 to 60 inches (48 to 152 cm); very dark grayish brown (10YR 3/2) gravelly loam; massive; friable, nonsticky and nonplastic; 15 percent gravel, 5 percent cobbles; strongly acid (pH 5.5).

TYPE LOCATION: Delta River Area, Alaska; UTM coordinates: Zone 6, Easting 547816, Northing 6989067

RANGE IN CHARACTERISTICS:

Soil moisture class: aquic
Average annual soil temperature: 32 to 30 degrees F (-0.1 to -1 degree C
Mean summer soil temperature: 36 to 39 degrees F. (2 to 4 degrees C)
Depth to strongly contrasting textural stratification: 13 to 23 inches (33 to 58 cm)

Oi horizon:
Colorvalue of 2 or 3; chroma of 1 to 4
Organic matter content65 to 90 percent
Reactionstrongly acid to slightly acid

A horizon:
Colorvalue of 2 or 3; chroma of 2 or 3
Texturemucky silt loam or silt loam
Clay content0 to 10 percent
Silt content55 to 75 percent
Sand content15 to 35 percent
Organic matter content8 to 12 percent
Rock fragments0 to 5 percent rounded very strongly cemented gravel
Reactionstrongly acid to slightly acid

2C horizon:
Colorhue of 10YR to 5Y; value of 3 to 5; chroma of 2 or 3
Texturegravelly loam, gravelly sandy loam, or loam
Clay content5 to 20 percent
Silt content10 to 45 percent
Sand content40 to 75 percent
Rock fragments5 to 25 percent subangular very strongly cemented gravel; 0 to 10 percent subangular very strongly cemented cobbles
Reactionstrongly acid to slightly acid

COMPETING SERIES: There are the no competing series in this classification.

GEOGRAPHIC SETTING:
Landforms: swales on mountains; swales on till plains
Parent material: silty eolian deposits over gravelly till
Elevation: 2,782 to 3,442 feet (848 to 1,049 m)
Slope: 2 to 12 percent
Annual precipitation: 28 to 35 inches (712 to 894 mm)
Annual temperature: 25 degrees F (-4 degrees C)
Frost-free period: 50 to 70 days

GEOGRAPHICALLY ASSOCIATED SOILS: These include Basaltlake and McCumbersome soils. Basaltlake soils are well drained, very deep, and occur on mountains. McCumbersome soils are well drained, very deep, and occur on till plains.

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

USE AND VEGETATION: Used for wildlife habitat and recreation. Native vegetation is diamondleadf willow scrub, moist.

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:
Umbric epipedon: 2 to 19 inches. (A1 and A2 horizons)
Coarse-loamy particle size control section: 10 to 40 inches below the mineral soil surface
Temperature regime: cryic
Temperature class: subgelic
Moisture regime: aquic.

ADDITIONAL DATA:

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National Cooperative Soil Survey
U.S.A.