LOCATION TUNGALARA               AK

Established Series
Rev. CAP
06/2025

TUNGALARA SERIES

Depth class: very deep
Drainage class: well drained
Parent material: organic material over sandy and loamy volcanic ash over medial silty volcanic ash over gravelly loamy till
Landscape: Islands
Landform: till plains and hills
Slopes: 0 to 20 percent
Mean annual precipitation: about 900 mm (35 in)
Mean annual temperature: 4 degrees C (39 degrees F.)
Frost-free season: 20 to 50 days

TAXONOMIC CLASS: Medial over sandy or sandy-skeletal, amorphic over mixed Typic Haplocryands

TYPICAL PEDON: Tungalara medial silt loam - on a grass herbaceous and shrubby till plain at elevation 79 meters (260 feet). (All colors are for moist soil.)

Oe--0 to 9 centimeters (0 to 4 inches); very dark brown (7.5YR 2.5/2), brown (7.5YR 4/2), dry; moderately decomposed plant material; soft, very friable, nonsticky, nonplastic; many fine, common medium and coarse roots throughout; very strongly acid (pH 4.7); clear smooth boundary.

A--9 to 26 centimeters (4 to 10 inches); very dark brown (7.5YR 2.5/3), brown (7.5YR 4/3), dry; medial silt loam; weak fine granular structure; soft, very friable, nonsticky, nonplastic; common fine, medium, and coarse roots throughout; very strongly acid (pH 4.9); clear wavy boundary.

Bw1--26 to 47 centimeters (10 to 19 inches); dark brown (7.5YR 3/4) medial silt loam; weak medium subangular blocky structure; slightly hard, friable, nonsticky, nonplastic; common fine, medium, and few coarse roots throughout; strongly acid (pH 5.3); gradual wavy boundary.

Bw2--47 to 95 centimeters (19 to 37 inches); dark brown (7.5YR 3/4) medial silt loam; moderate medium subangular blocky structure; slightly hard, friable, nonsticky, nonplastic; common fine roots throughout; 5 percent gravel; moderately acid (pH 5.6); abrupt wavy boundary.

2C--95 to 200 centimeters (37 to 79 inches); dark grayish brown (10YR 4/2) very gravelly loamy sand; single grain; loose, nonsticky, nonplastic; 50 percent gravel and 5 percent cobble; moderately acid (pH 5.8).

TYPE LOCATION: Kodiak Archipelago Soil Survey Area, Alaska; Latitude 57 degrees 30 minutes 52.99 seconds and Longitude 154 degrees 28 minutes 47.00 seconds west, UTM north 6375650.43 and UTM east 411358.85, zone 5, Datum WGS84.

RANGE IN CHARACTERISTICS:

Soil moisture regime: udic
Mean annual soil temperature: 1.6 to 3.3 degrees C. (34.8 to 37.9 degrees F.)
Thickness of organic material: 4 to 18 cm (2 to 7 in)
Depth to andic properties: 4 to 18 cm (2 to 7 in)
Depth to cambic horizon: 14 to 43 cm (6 to 17 in)
Depth to gravelly till: 52 to 130 cm (21 to 51 in)

Oa, Oe, Oi horizon:
Hue: 7.5YR to 10YR
Value: 2 to 5
Chroma: 1 to 4
Texture: slightly, moderately, or highly decomposed plant material
Organic matter: 60 to 90 percent
Reaction class: extremely acid to moderately acid (pH 3.5 to 6.0)

A horizon:
Hue: 7.5YR to 10YR
Value: 2 to 5
Chroma: 1 to 3
Texture: medial silt loam, silt, loam, and very fine sandy loam or their gravelly analogues
Rock fragments: 0 to 14 percent
Silt: 40 to 90 percent
Clay: 2 to 10 percent
Reaction class: extremely acid to moderately acid (pH 3.5 to 6.0)

Bw horizon:
Hue: 7.5YR to 10YR
Value: 2 to 5
Chroma: 3 to 6
Texture: (medial) silt loam, silt, loam, or very fine sandy loam, or their gravelly analogues
Silt: 40 to 90 percent
Clay: 2 to 12 percent
Rock fragments: 0 to 30 percent
Reaction class: extremely acid to moderately acid (pH 3.5 to 6.0)

2C horizon:
Hue: 7.5YR, 10YR, or 2.5Y
Value: 3 to 6
Chroma: 1 to 4
Texture: sandy loam, fine sandy loam, coarse sandy loam, loamy sand, loamy coarse sand, or their very or extremely gravelly analogues
Sand: 50 to 85 percent
Clay: 2 to 10 percent
Rock fragments: 35 to 80 percent
Reaction Class: extremely acid to slightly acid (pH 3.5 to 6.5)

COMPETING SERIES: This is the Sharatin (AK) series.
Sharatin soils have recent volcanic ashy surface horizons and occur on similar landform positions.

GEOGRAPHIC SETTING:
Elevation: 5 to 365 meters (15 to 1200 feet)
Parent material: moderately decomposed herbaceous organic material over sandy and loamy volcanic ash over medial silty volcanic ash over gravelly sandy and loamy outwash
Landform: plains and hills
Slope: 0 to 20 percent
Mean annual precipitation: 600 to 3000 mm (24 to 98 in)
Mean annual temperature: 0 to 6 degrees C. (32 to 43 degrees F.)
Frost free period: 20 to 50 days

GEOGRAPHICALLY ASSOCIATED SOILS: These include Akalura, Aleneva, Koniag, Luchek, Narrow Cape, Rezanof, Sharatin, Sulua, Terror Lake, Tonki, and Wineskey series.
Akalura soils occur on mountain, hill, or ridge on flanks, backslopes, footslopes and toeslopes.
Aleneva soils have aquic features at depths greater between 41 to 100 cm (16 to 40 in) and occur on drainageways and depressions.
Luchek soils have thick organic material over skeletal glacial till and occur in drainageways and depressions.
Narrow Cape soils lack sandy-skeletal substratum and occur on similar landform positions.
Rezanof soils have mollic epipedons and occur on similar landform positions.
Sharatin soils have recent ashy and glassy surface horizons and occur on similar positions.
Sulua soils have thick organic material over skeletal glacial till and occur on drainageways and depressions.
Terror Lake soils have aquic features at depths greater between 41 to 100 cm (16 to 40 in) and occur on drainageways and depressions.
Tonki soils have aquic features within 0 to 25 cm (0 to 10 in) and occur on drainageways and depressions.

DRAINAGE AND PERMEABILITY:
Drainage class: well drained
Saturated Hydraulic Conductivity: very high in the Oe horizon, moderately high to very high in the C horizon, moderately high or high in the A, Bw1, Bw2 horizons, and very high in the 2C.
Permeability: rapid or very rapid in the Oe horizon, moderate to rapid in the A, Bw1, Bw2, and rapid or rapid in the 2C horizons.
Runoff: low to medium.

USE AND VEGETATION:
Used for water shed. Native vegetation is Sitka Spruce, Forb meadow and Grass.

DISTRIBUTION AND EXTENT: MLRA 220 Alexander Archipelago-
Gulf of Alaska Coast
Extent: moderate.

SOIL SURVEY REGIONAL OFFICE (SSRO) RESPONSIBLE: Wasilla, Alaska

SERIES ESTABLISHED: Kodiak Archipelago Soil Survey, Alaska, 2024.

REMARKS: Diagnostic features and horizons recognized in this profile include:

Organic material: 0 to 9 cm (0 to 3 in) (moderately decomposed hemic plant material) (Oe horizon)

Andic soil properties: 9 to 95 cm (4 to 37 in) (A, Bw1, Bw2 horizons)

Cambic horizon: 26 to 95 cm (10 to 37 in) (Bw1, Bw2 horizons)

Lithological discontinuity: 95 to 200 cm (37 to 79 in)

ADDITIONAL DATA:

User pedon Id: 09BL 03602

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National Cooperative Soil Survey
U.S.A.