LOCATION TISUK                   AK

Established Series
Rev. MHC/DLM
02/2022

TISUK SERIES

Depth class: very deep
Drainage class: well drained
Landforms: hills, mountains, till plains
Parent material: silty eolian deposits over gravelly till
Elevation: 387 to 778 feet
Slope: 0 to 20 percent
Annual precipitation: 21 to 29 inches
Annual temperature: 24.8 degrees F
Frost-free period: 60 to 90 days

TAXONOMIC CLASS:

TYPICAL PEDON: Tisuk silt loam - on a slope of 12 percent under ericaceous shrub/lichen dwarf scrub. (All colors are for moist soil)

Oi-0 to 1 inch; very dark brown (10YR 2/2) slightly decomposed plant material; many very fine and fine and common medium roots; extremely acid (pH 4.4); abrupt smooth boundary.

A-1 to 4 inches; very dark brown (10YR 2/2) and dark brown (10YR 3/3) silt loam; very friable, nonsticky and nonplastic; common very fine and fine and few medium roots; 2 percent gravel, 2 percent cobbles; very strongly acid (pH 4.8); clear smooth boundary.

2Bw-4 to 15 inches; dark yellowish brown (10YR 3/4) gravelly loam; friable, nonsticky and nonplastic; common very fine and fine roots; 15 percent gravel, 2 percent cobbles; strongly acid (pH 5.5); gradual smooth boundary.

2C1-15 to 21 inches; olive brown (2.5Y 4/3) very cobbly sandy loam; friable, nonsticky and nonplastic; few very fine and fine roots; 20 percent gravel, 15 percent cobbles; moderately acid (pH 5.9); gradual smooth boundary.

2C2-21 to 60 inches; olive brown (2.5Y 4/3) very cobbly sandy loam; friable, nonsticky and nonplastic; 20 percent gravel, 20 percent cobbles; moderately acid (pH 5.9).

TYPE LOCATION: Steward River Training Site, Alaska; UTM coordinates: Zone 3, Easting 478805, Northing 7185399.

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 strongly contrasting textural stratification: 2 to 5 inches

Oi horizon:
Hue: 7.5YR or 10YR
Value: 2 t0 3
Chroma: 1 t0 3
Organic matter content: 65 to 90 percent
Reaction: extremely acid to very strongly acid

A horizon:
Hue: 7.5YR or 10YR
Value: 2.5 or 3
Chroma: 2 or 3
Clay content: 0 to 10 percent
Silt content: 55 to 75 percent
Sand content: 15 to 35 percent
Organic matter content: 3 to 6 percent
Rock fragments: 0 to 10 percent rounded indurated gravel, 0 to 5 percent rounded indurated cobbles
Reaction: extremely acid to strongly acid

2Bw horizon:
Hue: 10YR or 2.5Y
Value: 3 or 4
Chroma: 3 or 4
Texture: cobbly sandy loam, very cobbly sandy loam, gravelly loam
Clay content: 5 to 25 percent
Silt content: 10 to 45 percent
Sand content: 40 to 75 percent
Organic matter content: 0 to 2 percent
Rock fragments: 0 to 30 percent subangular very strongly cemented gravel, 0 to 5 percent subangular very strongly cemented cobbles
Reaction: very strongly acid to slightly acid

2C horizon:
Hue: 10YR to 5Y
Value: 3 to 5
Chroma: 2 to 4
Texture: very cobbly sandy loam, very gravelly sandy loam
Clay content: 0 to 20 percent
Silt content: 10 to 40 percent
Sand content: 45 to 80 percent
Rock fragments: 15 to 30 percent subangular very strongly cemented gravel, 5 to 40 percent subangular very strongly cemented cobbles
Reaction: very strongly acid to slightly acid

COMPETING SERIES: These are the McKinley and Pinguk soils. McKinley soils are moderately deep to bedrock. Pinguk soils have saturated horizons in the spring.

GEOGRAPHIC SETTING:
Landforms: hills, mountains, till plains
Parent material: silty eolian deposits over gravelly till
Elevation: 387 to 778 feet
Slope: 0 to 20 percent
Annual precipitation: 21 to 29 inches
Annual temperature: 24.8 degrees F
Frost-free period: 60 to 90 days

GEOGRAPHICALLY ASSOCIATED SOILS: These include Dirrant, Imuruk, and Kuzitrin soils. Dirrant soils are very poorly drained, shallow to permafrost, and occur on till plains. Imuruk soils are somewhat excessively drained, very deep, and occur on hills, and outwash plains. Kuzitrin soils are somewhat poorly drained, very deep, and occur on swales on mountains and swales on till plains.

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

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

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

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

SERIES ESTABLISHED: Steward River Training Area, Alaska, 2005

REMARKS: Diagnostic features and horizons recognized in this profile include:
Cambic horizon: 4 to 15 inches. (2Bw horizon)
Weighted average loamy-skeletal particle size control section: 10 to 40 inches
Temperature regime: cryic

ADDITIONAL DATA:

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National Cooperative Soil Survey
U.S.A.