LOCATION URANATINA AK
Established Series
SDB/MJS
08/2025
URANATINA SERIES
Depth class: very deep
Drainage class: well drained
Parent material: organic material over silty noncalcareous loess over gravelly glaciofluvial deposits
Landscape: lake plains and outwash plains and till plains
Landform: glacial lakes (relict), outwash plains, bluffs, and flats
Slope: 0 to 10 percent
Mean annual precipitation: about 600 mm (24 in)
Mean annual air temperature: about -3 degrees C (27 F)
Frost-free period: 40 to 103 days
TAXONOMIC CLASS: Coarse-loamy, mixed, superactive Typic Haplocryepts
TYPICAL PEDON: Uranatina cobbly silt loam in a white spruce community on an outwash plain with a slope of 6 percent at an elevation of 605m (1980 ft).
Oe--0 to 7 cm (0 to 3 in); moderately decomposed plant material, black (10YR 2/1) moist; weak medium subangular blocky structure; very friable; nonsmeary; many very fine and fine, common medium, and many coarse roots throughout; very fine and fine tubular pores; strongly acid (pH 5.2); abrupt wavy boundary. (5 to 15 cm, 2 to 6 in)
Bw--7 to 23 cm (3 to 9 in); cobbly silt loam, 80 percent dark yellowish brown (10YR 4/4) and 20 percent dark brown (7.5YR 3/4) moist; moderate medium subangular blocky structure; friable, slightly sticky, slightly plastic; nonsmeary; common very fine and fine, few medium, and common coarse roots throughout; very fine and fine tubular pores; 5 percent gravel 30 percent cobbles by volume; moderately acid (pH 5.6); clear wavy boundary. (15 to 32 cm, 6 to 13 in)
C--23 to 51 cm (9 to 20 in); cobbly loamy sand, 60 percent light olive brown (2.5Y 5/3) and 40 percent very dark gray (2.5Y 3/1) moist; single grain; very friable, nonsticky, nonplastic; nonsmeary; few very fine and fine roots throughout; common very fine and fine tubular pores; 15 percent gravel and 30 percent cobbles by volume; moderately acid (pH 5.6); clear smooth boundary. (8 to 34 cm, 3 to 13 in)
2C--51 to 150 cm (20 to 59 in); loam, olive (5Y 5/3) moist; single grain; very friable, nonsticky, nonplastic; nonsmeary; very fine and fine tubular pores; 10 percent gravel and 10 percent cobbles by volume; moderately acid (pH 5.7). (69 to 122 cm, 27 to 48 in)
TYPE LOCATION: North Copper River Soil Survey Area, Alaska; latitude 61.65502, longitude -145.20647, UTM 6837058.68 north and UTM 594992.34 east, zone 6, Datum WGS84.
RANGE IN CHARACTERISTICS:
Soil moisture regime: udic
Soil temperature regime: cryic
Mean annual soil temperature: -1 to 5 degrees C. (30 to 41 F)
Thickness of organic material: 5 to 15 cm (2 to 6 in)
Thickness of ochric epipedon: 5 to 15 cm (2 to 6 in)
Thickness of cambic horizon: 15 to 32 cm (6 to 13 in)
Depth to lithologic discontinuity: 28 to 81 cm (11 to 32 in)
Oi, Oe or Oa horizon:
Hue: 7.5YR or 10YR
Value: 2 to 4
Chroma: 1 to 2
Texture: slightly decomposed organic material, moderately decomposed organic material, highly decomposed organic material
Organic matter: 60 to 90 percent
Reaction class: very strongly acid to strongly acid (pH 4.5 to 5.5)
Bw horizon:
Hue: 10YR or 2.5Y
Value: 4 to 6
Chroma: 2 to 5
Texture: very gravelly loam, gravelly silt loam, gravelly sandy loam, very cobbly silt loam
Sand: 22 to 65 percent
Silt: 32 to 75 percent
Clay: 3 to 13 percent
Rock fragments: 12 to 56 percent
Gravels: 4 to 24 percent
Cobbles: 8 to 32 percent
Organic matter: 0.5 to 1.5 percent
Reaction class: strongly acid to moderately acid (pH 5.1 to 6)
C horizon:
Hue: 2.5Y or 5Y
Value: 4 to 6
Chroma: 1 to 3
Texture: gravelly silt loam, cobbly sand, gravelly sandy loam, very cobbly loamy sand
Sand: 29 to 91 percent
Silt: 0 to 58 percent
Clay: 1 to 13 percent
Rock fragments: 17 to 50 percent
Gravels: 3 to 32 percent
Cobbles: 14 to 18 percent
Organic matter: 0.25 to 1 percent
Reaction class: strongly acid to moderately acid (pH 5.1 to 6)
2C horizon:
Hue: 2.5Y or 5Y
Value: 4 to 6
Chroma: 1 to 3
Texture: gravelly sandy clay loam, gravelly sandy loam, cobbly loamy sand, gravelly silt loam, cobbly loam.
Sand: 35 to 85 percent
Silt: 10 to 60 percent
Clay: 5 to 21 percent
Rock fragments: 3 to 32 percent
Gravels: 3 to 16 percent
Cobbles: 0 to 16 percent
Organic matter: 0 to 0.2 percent
Reaction class: strongly acid to moderately acid (pH 5.1 to 6)
Some pedons have a 4 to 11 cm thick A horizon with a silt loam or sandy loam texture, hue of 10YR or 2.5Y, value of 2 to 4, and chroma of 1 to 3.
COMPETING SERIES: These are the
Eska (AK), Forthofjuly (AK),
Ganhona (AK),
Kaknau (AK),
Kalambach (AK),
Mine (CO and WY),
Progress (AK),
Sambrito (CO, ID and UT),
Southpaw (AK),
Steese (AK),
Tebay (AK),
Tsana (AK), soils.
Eska is somewhat poorly drained, forms in loess covered gravelly till, and occurs on till plains and hills.
Fourthofjuly soils have an A or A/E horizon and a loess mantle.
Ganhona soils havestratified very fine sandy loam to silt loam surface texture, and occurs on river valleys, flood plains, and lacustrine terraces in mountains.
Kaknau and
Steese soils have paralithic contacts within 2 m (79 in) of surface.
Kalambach,
Progress,
Southpaw,
Tebay, and
Tsana soils have loess mantles.
Mine soils have slop alluvium and colluvium as parent material and occur at elevations above 2000 m (9,840 ft).
Sambrito soils have a paralithic contact within 200 cm (79 in) occur at elevations above 2000 m (9,840 ft).
GEOGRAPHIC SETTING:
Elevation: 200 to 1000 meters (655 to 3280 ft)
Parent material: organic material over silty noncalcareous loess over gravelly fluvial deposits
Landform: glacial lakes (relict), outwash plains, bluffs, and flats
Slopes: 0 to 10 percent
Mean annual precipitation: 300 to 1400 mm (12 to 55 in)
Mean annual air temperature: -5 to -1 degrees C. (23 to 30 degrees F)
Frost-free period: 40 to 103 days
GEOGRAPHICALLY ASSOCIATED SOILS: These are the
Ahtell,
Basaltlake,
Hundell,
Manker,
Thirdlake, and
Tiekel soils.
Ahtell soils are have folistic and umbric epipedons, and occur on hill tops, and hillside positions.
Basaltlake soils have a silt mantle over till, and occur on mountain slopes.
Hundell soils are moderately well drained, do not have a cambic horizon, and occur on flats and bluffs in till plains and outwash plains.
Manker soils are moderately well drained, have permafrost and cryoturbated horizon, and occur on north facing slopes
Thirdlake soils are poorly drained, have aquic conditions starting at a depth of 6 and 27 cm (2 and 11 in) and occur on glacial lakes and flats in outwash plains.
Tiekel soils are very poorly drained, have histic epipedons, have cobbles and gravels the O horizon, and occur in outwash plains and lake plains.
DRAINAGE AND SATURATED HYDRAULIC CONDUCTIVITY:
Drainage class: well drained
Saturated Hydraulic Conductivity: very high in the Oe and C horizons, moderately high in the Bw horizon, high in the 2C horizon.
Permeability: very rapid in the Oe and C horizons, moderate in the Bw horizon, moderately rapid in the 2C horizon.
Runoff: medium
USE AND VEGETATION:
Use: wildlife habitat, recreation, and subsistence
Native vegetation: white spruce and moss
DISTRIBUTION AND EXTENT: MLRA 228 Interior Alaska mountains.
Extent: moderate
SOIL SURVEY REGIONAL OFFICE (SSRO) RESPONSIBLE: Wasilla, Alaska
SERIES ESTABLISHED: North Copper River Soil Survey, Alaska, 2024.
REMARKS: Diagnostic features and horizons recognized in this profile include:
Particle-size control section: 32 to 107 cm (13 to 42 in)
Ochric epipedon: 0 to 7 cm (0 to 3 in) (Oe horizon)
Cambic horizon: 7 to 23 cm (3 to 9 in) (Bw horizon)
Lithologic discontinuity: 51 to 150 cm (20 to 59 in) (2C horizon)
ADDITIONAL DATA:
User pedon Id: 2022AK261226
National Cooperative Soil Survey
U.S.A.