LOCATION UVLUUTIT                AK

Established Series
CBB
11/2024

UVLUUTIT SERIES

Depth class: moderately deep to bedrock, lithic
Drainage class: well drained
Parent material: noncalcareous loess over gravelly loamy residuum weathered from calcareous sandstone
Landscape: hills
Landform: hillslopes
Slopes: 2 to 15 percent
Mean annual precipitation: about 400 mm (16 in)
Mean annual air temperature: about -4 degrees C. (25 degrees F.)
Frost-free period: 70 to 85 days

TAXONOMIC CLASS: Loamy-skeletal, mixed, active Typic Haplocryepts

TYPICAL PEDON: Uvluutit silt loam in a white spruce woodland on a west facing convex, convex backslope on a slope of 9 percent at an elevation of 230 m (755 ft)

Oe--0 to 7 cm (0 to 3 in); moderately decomposed plant material, black (5YR 2.5/1) exterior moist, dark gray (5YR 4/1) exterior dry; weak coarse granular structure; common very fine, fine, and medium roots throughout; neutral (pH 6.8); abrupt smooth boundary. (3 to 8 cm, 1 to 3 in thick)

Oa--7 to 12 cm (3 to 5 in); highly decomposed plant material, black (10YR 2/1) exterior moist, dark gray (10YR 4/1) exterior dry; moderate medium granular structure; common very fine and fine and few medium roots throughout; neutral (pH 6.8); clear wavy boundary. (3 to 6 cm, 1 to 2 in thick)

A--12 to 17 cm (5 to 7 in); silt loam, dark gray (2.5Y 4/1) exterior moist, gray (2.5Y 6/1) exterior dry; moderate medium subangular blocky structure; friable, slightly hard, nonsticky, nonplastic; nonsmeary; common very fine and fine and few medium roots throughout; very fine, fine, and medium tubular pores; 5 percent medium, prominent, irregular strong brown (7.5YR 4/6), moist, masses of oxidized iron in matrix; 10 percent channers; neutral (pH 6.9); clear wavy boundary (3 to 10 cm, 1 to 4 in thick)

Bw--17 to 43 cm (7 to 17 in); channery silt loam, grayish olive (10Y 5/2) exterior moist, light greenish gray (10Y 7/1) exterior dry; moderate medium subangular blocky structure; friable, slightly hard, slightly sticky, moderately plastic; nonsmeary; few very fine roots top of horizon; very fine and fine tubular pores; 1 percent carbonate coats on rock fragments; 15 percent medium, prominent, irregular strong brown (7.5YR 4/6), moist, masses of oxidized iron in matrix; 30 percent channers; neutral (pH 7.3); clear irregular boundary. (15 to 35 cm, 6 to 14 in thick)

2Ck--43 to 95 cm (17 to 37 in); very flaggy sandy loam, dark gray (2.5Y 4/1) exterior moist, gray (2.5Y 6/1) exterior dry; massive; slightly hard, friable, slightly sticky, slightly plastic; nonsmeary; very fine tubular pores; 3 percent distinct carbonate coats on rock fragments; finely disseminated carbonates in matrix and 2 percent fine, distinct, platy mica flakes with sharp boundaries in matrix; 10 percent channers and 45 percent flagstones; strong effervescence; moderately alkaline (pH 7.9); very abrupt irregular boundary. (35 to 60 cm, 14 to 24 in thick)

2R--95 to 120 cm (37 to 47 in); strongly coherent to indurated calcareous sandstone bedrock.

TYPE LOCATION: Nulato Hills - Continental Divide and Blackburn Hills Soil Survey Area, Alaska; latitude 65 degrees 31 minutes 9.53 seconds north, longitude 159 degrees, 50 minutes, 6.84 seconds west, datum WGS84, UTM north 7266589.31 and UTM east 461380.34, zone 4W, d

RANGE IN CHARACTERISTICS:

Soil moisture regime: udic
Soil temperature regime: cryic
Mean annual soil temperature: 0 to 3 degrees C. (32 to 37 degrees F.)
Thickness of organic material: 6 to 14 cm (2 to 6 in)
Thickness of ochric epipedon: 11 to 24 cm (4 to 9 in)
Thickness of cambic horizon: 18 to 43 cm (7 to 17 in)
Depth to redoximorphic concentrations: 11 to 24 cm (4 to 9 in)
Depth to free carbonates: 26 to 59 cm (10 to 23 in)
Depth to lithologic discontinuity: 26 to 59 cm (10 to 23 in)
Depth to lithic contact: 50 to 100 cm (20 to 40 in)

Oe horizon:
Hue: 5YR or 7.5YR
Value: 2 to 3 moist, 4 to 5 dry
Chroma: 1 to 2
Texture: moderately decomposed plant material
Organic matter: 60 to 90 percent
Reaction class: neutral to slightly alkaline (pH 6.6 to 7.8)

Oa horizon:
Hue: 10YR, 7.5YR, or 5YR
Value: 2 to 3 moist, 4 to 5 dry
Chroma: 1 to 2
Texture: highly decomposed plant material
Organic matter: 60 to 90 percent
Reaction class: neutral to slightly alkaline (pH 6.6 to 7.4)

A horizon:
Hue: 2.5Y, 10YR, or 7.5YR
Value: 2 to 4 moist, 4 to 6 dry
Chroma: 1 to 2
Texture: silt loam
Sand: 5 to 40 percent
Silt: 50 to 83 percent
Clay: 6 to 12 percent
Rock fragments: 0 to 14 percent
Channers: 0 to 14 percent
Organic matter: 1 to 6 percent
Reaction class: neutral to slightly alkaline (pH 6.6 to 7.4)

Bw horizon:
Hue: 10Y, 5Y, 2.5Y, or 10YR
Value: 3 to 5 moist, 5 to 7 dry
Chroma: 2 to 3
Texture: silt loam, loam, or their channery analogues
Sand: 5 to 52 percent
Silt: 31 to 83 percent
Clay: 8 to 17 percent
Rock fragments: 15 to 59 percent
Channers: 15 to 50 percent
Organic matter: 0.5 to 3 percent
Reaction class: neutral to slightly alkaline (pH 6.6 to 7.8)

2Ck horizon:
Hue: 2.5Y or 10YR
Value: 4 to 5 moist, 6 to 7 dry
Chroma: 1 to 4
Texture: sandy loam, silt loam, or their flaggy analogues
Sand: 20 to 70 percent
Silt: 13 to 72 percent
Clay: 8 to 17 percent
Rock fragments: 35 to 59 percent
Channers: 5 to 35 percent
Flagstones: 0 to 50 percent
Organic matter: 0.4 to 2 percent
Reaction class: neutral to moderately alkaline (pH 6.6 to 8.4)

2R horizon

COMPETING SERIES: There are no competing series.

GEOGRAPHIC SETTING:
Elevation: 130 to 400 meters (425 to 1310 feet)
Parent material: noncalcareous loess over gravelly loamy residuum weathered from calcareous sandstone
Landform: hillslopes
Slopes: 2 to 15 percent
Mean annual precipitation: 300 to 500 mm (12 to 20 in)
Mean annual air temperature: -6 to -2 degrees C. (21 to 28 degrees F.)
Frost free period: 70 to 85 days

GEOGRAPHICALLY ASSOCIATED SOILS: These are the Littlekalusukcreek, Igniq, and Tikigak soils.
Littlekalusukcreek soils have a histic epipedon, a calcic horizon at depths between 23 to 110 cm (9 to 43 in), and occur on ridges of hills.
Igniq soils have a folistic epipedon, cryoturbation at depths below 15 cm (6 in), and occur on similar landforms on footslope and backslope positions.
Tikigak soils have a mollic epipedon and occur on similar landforms on linear, linear backslopes.

DRAINAGE AND SATURATED HYDRAULIC CONDUCTIVITY:
Drainage class: well drained
Saturated Hydraulic Conductivity: very high in the O horizons, moderately high in the A horizon, and moderately high to high in the Bw and 2Ck horizons
Permeability: rapid to very rapid in the O horizons, moderate in the A horizon, moderate to moderately rapid in the Bw horizon, and moderate to rapid in the 2Ck horizon
Runoff: medium

USE AND VEGETATION:
Use: wildlife habitat, recreation, and subsistence
Native vegetation: bog blueberry, splendid feather moss, Richardson's willow, white spruce, white arctic mountain heather, Schreber's big red stem moss, tealeaf willow, black crowberry, moss, tomentypnum moss, grayleaf willow, cetraria lichen, red fruit bearberry, netleaf willow, greygreen reindeer lichen, felt lichen, Dasiphora fruticosa, resin birch, cup lichen, reindeer lichen, arctic lupine, entireleaf mountain-avens, lingonberry, and Altai fescue.

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

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

SERIES ESTABLISHED: Nulato Hills - Continental Divide and Blackburn Hills Soil Survey, Alaska, 2024.

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

Particle-size control section: 37 to 95 cm (15 to 37 in)

Ochric epipedon: 0 to 17 cm (0 to 7 in) (Oe, Oa, and A horizons)

Cambic horizon: 12 to 43 cm (5 to 17 in) (A and Bw horizons)

Redoximorphic concentrations: 17 to 43 cm (7 to 17 in) (Bw horizon)

Lithologic discontinuity: 43 to 120 cm (17 to 47 in) (2Ck and 2R horizon)s

Lithic contact: 95 cm (37 in) (2R horizon)

ADDITIONAL DATA:

User pedon ID: 2023AK188105

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National Cooperative Soil Survey
U.S.A.