LOCATION SINUKTUK AK

Established Series
Rev. MHC/DLM
02/2022

SINUKTUK SERIES

Depth class: moderately deep
Drainage class: well drained
Landforms: mountains
Parent material: silty eolian deposits over gravelly colluvium derived from schist
Elevation: 381 to 2119 feet
Slope: 5 to 25 percent
Annual precipitation: 22 to 27 inches
Annual temperature: 23 to 25 degrees F
Frost-free period: 60 to 90 days

TAXONOMIC CLASS:

TYPICAL PEDON: Sinuktuk loam- on a slope of 20 percent under ericaceous shrub/lichen dwarf shrub. (All colors are for moist soil)

Oe--0 to 1 inch; very dark brown (10YR 2/2) moderately decomposed plant material; many very fine and fine and few medium roots; 2 percent channers; extremely acid (pH 4.4); abrupt wavy boundary.

A--1 to 3 inches; dark reddish brown (5YR 2.5/2) silt loam; very friable, nonsticky and nonplastic; many very fine and fine and few medium roots; 2 percent channers; 45 percent mica flakes in the fine earth fraction; extremely acid (pH 4.4); clear wavy boundary.

2Bw1--3 to 7 inches; dark brown (7.5YR 3/4) very channery loam; friable, nonsticky and nonplastic; many very fine and fine roots; 45 percent channers, 10 percent flagstones; 55 percent mica flakes in the fine earth fraction; very strongly acid (pH 5.0); clear wavy boundary.

2Bw2--7 to 16 inches; dark yellowish brown (10YR 4/4) very channery loam; friable, nonsticky and nonplastic; common very fine and fine roots; 45 percent channers, 10 percent flagstones; 55 percent mica flakes in the fine earth fraction; very strongly acid (pH 5.0); gradual smooth boundary.

2C1--16 to 31 inches; dark yellowish brown (10YR 4/4) and olive brown (2.5Y 4/4) very channery loam; friable, nonsticky and nonplastic; 45 percent channers, 10 percent flagstones; 55 percent mica flakes in the fine earth fraction; moderately acid (5.9); diffuse smooth boundary.

2C2--31 to 38 inches; olive brown (2.5Y 4/4) very channery loam; friable, nonsticky and nonplastic; 45 percent channers, 10 percent flagstones; 55 percent mica flakes in the fine earth fraction; moderately acid (pH 5.9); clear smooth boundary.

3Cr--38 to 60 inches; fractured bedrock.

TYPE LOCATION: Steward River Training site, Alaska; UTM coordinates: Zone 3, Easting 480989, Northing 7189616

RANGE IN CHARACTERISTICS:
Soil moisture class: udic
Average annual soil temperature: about 29 degrees F.
Mean summer soil temperature: about 35 degrees F.
Depth to bedrock (paralithic): 27 to 38 inches
Depth to strongly contrasting textural stratification: 2 to 6 inches

Oi horizon:
Hue: 2.5YR to 7.5YR
Value: 2 to 3
Chroma: 2 to 4
Organic matter content: 85 to 95 percent
Reaction: extremely acid to moderately acid

A horizon:
Hue: 2.5YR to 7.5YR
Value: 2 to 3
Chroma: 2 or 3
Texture: silt loam, loam
Clay content: 0 to 10 percent
Silt content: 50 to 80 percent
Sand content: 15 to 50 percent
Organic matter content: 2 to 8 percent
Rock fragments: 0 to 5 percent strongly cemented channers, 0 to 2 percent strongly cemented flagstones
Reaction: extremely acid to moderately acid

2Bw horizon:
Hue: 7YR to 2.5Y
Value: 3 to 5
Chroma: 3 or 4
Texture: very channery loam, very channery silt loam, extremely channery silt loam
Clay content: 0 to 10 percent
Silt content: 40 to 65 percent
Sand content: 25 to 50 percent
Organic matter content: 1 to 5 percent
Rock fragments: 25 to 50 percent strongly cemented channers, 0 to 20 percent strongly cemented flagstones
Reaction: very strongly acid to slightly acid

2C horizon:
Hue: 10YR, 2.5Y or 5Y
Value: 3 or 4
Chroma: 2 to 4
Texture: very channery loam, very channery silt loam, extremely channery silt loam
Clay content: 0 to 10 percent
Silt content: 40 to 65 percent
Sand content: 25 to 50 percent
Rock fragments: 25 to 50 percent strongly cemented channers, 0 to 20 percent strongly cemented flagstones
Reaction: strongly acid to slightly alkaline

COMPETING SERIES: There are no completing series in this classification.

GEOGRAPHIC SETTING:
Landforms: mountains
Parent material: silty eolian deposits over gravelly colluvium derived from schist
Elevation: 381 to 2119 feet
Slope: 5 to 25 percent
Annual precipitation: 22 to 27 inches
Annual temperature: 23 to 25 degrees F
Frost-free period: 60 to 90 days

GEOGRAPHICALLY ASSOCIATED SOILS: These include Boldrin, Kiglauik, and Tuksuk soils. Boldrin soils are very poorly drained, shallow to moderately deep to permafrost, and occur on mountain toeslopes and footslopes. Kiglauik soils are somewhat poorly drained, moderately deep to bedrock, and occur on mountains. Tuksuk soils are very poorly drained, moderately deep to bedrock, and occur on mountains.

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

USE AND VEGETATION: Used for military use and wildlife habitat. Native vegetation is ericaceous shrub/lichen dwarf shrub.

DISTRIBUTION AND EXTENT: MLRA 240, Nulato Hill-Southern Seward Peninsula Highlands. Alaska. The series is of small extent.

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

SERIES ESTABLISHED: Steward River Training Site, Alaska, 2005

REMARKS: Diagnostic features and horizons recognized in this profile include:
Paralithic contact: 38 inches. (3Cr horizon)
Cambic horizon: 3 to 16 inches. (2Bw1 and 2Bw2 horizons)
Lithologic discontinuity: At the upper boundary of 2Bw1 horizon
Loamy-skeletal particle size control section: 10 to 38 inches
Temperature regime: cryic

ADDITIONAL DATA:

The mineralogy class was changed from paramicaceous to micaceous in 07/2010 by the National Soil Survey Center on request of the responsible MLRA regional office. The change was necessary based on the eleventh edition of the Keys to Soil Taxonomy, 2010.

National Cooperative Soil Survey
U.S.A.