LOCATION ANUGI AK
Tentative Series
ZKA/MPS
11/2024
ANUGI SERIES
Depth class: very deep
Drainage class: well drained
Parent material: gravelly loamy colluvium over residuum weathered from slate
Landscape: mountains, hills
Landform: mountain slopes, hillslopes
Slope: 12 to 50 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 90 days
TAXONOMIC CLASS: Loamy-skeletal, mixed, superactive Typic Haplocryepts
TYPICAL PEDON: Anugi very cobbly sandy loam in an ericaceous scrubland alpine community on an east facing convex, convex backslope on a slope of 32 percent at an elevation of 427m (1400 ft)
Oe--0 to 4 cm (0 to 2 in); moderately decomposed plant material; very dark brown (10YR 2/2) moist, dark grayish brown (10YR 4/2) dry; many very fine and fine roots throughout; moderately acid (pH 5.7); clear smooth boundary. (2 to 8 cm, 1 to 3 in thick)
A--4 to 11 cm (2 to 4 in); very cobbly sandy loam; dark brown (10YR 3/3) moist, brown (10YR 5/3) dry; weak medium granular structure; friable, slightly hard, nonsticky, nonplastic; nonfluid; many very fine and fine roots throughout; common very fine and few fine tubular pores; 20 percent gravel and 16 percent cobbles; moderately acid (pH 5.8); clear smooth boundary. (5 to 18 cm, 2 to 7 in thick)
Bw--11 to 50 cm (5 to 20 in); extremely cobbly sandy loam; dark grayish brown (10YR 4/2) moist, light brownish gray (10YR 6/2) dry; weak fine subangular blocky structure; friable, slightly hard, nonsticky, nonplastic; nonfluid; many very fine and fine roots throughout; many very fine and common fine tubular pores; 35 percent gravel and 35 percent cobbles; moderately acid (pH 5.9); clear smooth boundary. (15 to 50 cm, 6 to 20 in thick)
C1--50 to 70 cm (20 to 28 in); stones; few very fine and fine roots throughout; many very coarse, medium, and coarse interstitial pores; 45 percent cobbles and 50 percent stones; clear wavy boundary. (10 to 30 cm, 4 to 12 in thick)
C2--70 to 170 cm (28 to 67 in); extremely stony sandy loam; dark grayish brown (2.5Y 4/2) moist, light brownish gray (2.5Y 6/2) dry; massive; very friable, soft, nonsticky, nonplastic; nonfluid; many very fine and fine tubular, and common medium and coarse interstitial pores; 40 percent cobbles and 40 percent stones; moderately acid (pH 5.8). (93 to 118 cm, 37 to 47 in thick)
2R--170 to 195 cm (67 to 77 in); indurated slate bedrock.
TYPE LOCATION: Nulato Hills - Continental Divide and Blackburn Hills Soil Survey Area, Alaska; latitude 64.2954169, longitude -160.0478650, datum WGS84, UTM north 7130351.80 and UTM east 449290.22, zone 4, datum WGS84.
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: 2 to 8 cm (1 to 3 in)
Thickness of ochric epipedon: 7 to 26 cm (3 to 10 in)
Thickness of cambic horizon: 15 to 50 cm (6 to 20 in)
Depth to lithic contact: 150 to 200 cm (60 to 79 in)
Oe horizon:
Hue: 5YR, 7.5YR, 10YR
Value: 2 to 3 moist, 4 to 5 dry
Chroma: 1 to 3
Texture: moderately decomposed material
Organic matter: 60 to 90 percent
Reaction class: extremely acid to moderately acid (pH 3.5 to 6)
A horizon:
Hue: 5YR, 7.5YR, 10YR
Value: 2 to 3 moist, 4 to 5 dry
Chroma: 1 to 3
Texture: silt loam, sandy loam or their gravelly or cobbly analogues
Sand: 5 to 75 percent
Silt: 8 to 83 percent
Clay: 2 to 17 percent
Rock fragments: 35 to 59 percent
Gravels: 10 to 50 percent
Cobbles: 5 to 25 percent
Organic matter: 2 to 8 percent
Reaction class: very strongly acid to moderately acid (pH 4.5 to 6)
Bw horizon:
Hue: 10YR or 2.5Y
Value: 4 or 5 moist, 6 to 7 dry
Chroma: 2 to 4
Texture: silt loam, sandy loam or their gravelly or cobbly analogues
Sand: 20 to 75 percent
Silt: 8 to 76 percent
Clay: 4 to 17 percent
Rock fragments: 60 to 85 percent
Gravels: 25 to 45 percent
Cobbles: 15 to 45 percent
Organic matter: 0.5 to 6 percent
Reaction class: strongly acid to slightly acid (pH 5.1 to 6.5)
C1 horizon:
In lieu of texture: stones, cobbles
Rock fragments: 90 to 100 percent
Cobbles: 30 to 60 percent
Stones: 30 to 70 percent
C1 horizon:
Hue: 2.5Y or 5Y
Value: 3 to 5 moist, 4 to 7 dry
Chroma: 2 or 3
Texture: silt loam, sandy loam or their gravelly or stony analogues
Sand: 20 to 75 percent
Silt: 3 to 76 percent
Clay: 4 to 17 percent
Rock fragments: 60 to 89 percent
Gravels: 0 to 45 percent
Cobbles: 10 to 50 percent
Stones: 10 to 70 percent
Organic matter: 0.4 to 3 percent
Reaction class: moderately acid to slightly acid (pH 5.6 to 6.5)
R horizon:
Strongly coherent to indurated slate bedrock.
COMPETING SERIES: These are the
Aniruk,
Basaltlake, Buthclake,
Nunatak, Sikrsik,
Telay,
Tui,
Urgiilik (AK),
Enentah,
Storm (CO),
Targhee (CO, ID, MT),
Garlet,
Kegsprings,
Mountedith,
Nooney (MT), Gnomes (NM),
Cuberant (UT),
Raymond (WY) series.
Aniruk soils have a mean annual precipitation range of 300 to 500 mm (12 to 20 in), and have a frost free period range of 70 to 85 days
Basaltlake soils have buried A horizons and have a mean annual air temperature of -4 degrees C. (25 degrees F.)
Butchlake soils have a mean annual air temperature range of -4 to -2 degrees C. (24 to 28 degrees F.)
Nunatak soils have a lithic contact at depths between 100 to 150 cm (40 to 60 in) and have a mean annual air temperature range of 0 to 9 degrees C. (32 to 48 degrees F.)
Siksrik soils have a mean annual precipitation range of 300 to 500 mm (12 to 20 in)
Telay soils have a mean annual air temperature of -3 degrees C. (26 degrees F.)
Tui soils have buried A and Bw horizons
Urgiilik soils have a lithic contact at depths between 50 to 100 cm (20 to 40 in) and have a mean annual precipitation range of 300 to 500 mm (12 to 20 in)
Enentah soils lack an organic surface, have an albic horizon, and have a mean annual air temperature range of 2 to 6 degrees C. (36 to 42 degrees F.)
Storm soils have a mean annual air temperature range of -1 to 3 degrees C. (31 to 38 degrees F.)
Targhee soils have a lithic contact at depths between 50 to 100 cm (20 to 40 in), lack an organic surface, and have a mean annual air temperature range of 2 to 4 degrees C. (36 to 39 degrees F.)
Garlet soils have an albic horizon, have secondary carbonates at depths below 80 cm (32 in), have a mean annual air temperature range of 2 to 7 degrees C. (36 to 45 degrees F.)
Kegsprings soils have a mean annual air temperature range of 1 to 4 degrees C. (34 to 39 degrees F.)
Mountedith soils have a mean annual air temperature range of 1 to 4 degrees C. (34 to 39 degrees F.)
Nooney soils have a lithic contact at depths between 100 to 150 cm (40 to 60 in) and have a mean annual air temperature range of 1 to 4 degrees C. (34 to 39 degrees F.)
Gnomes soils have a mean annual air temperature range of 1 to 3 degrees C. (34 to 38 degrees F.)
Cuberant soils have a lithic contact at depths between 50 to 100 cm (20 to 40 in) and have a mean annual air temperature range of 2 to 5 degrees C. (35 to 41 degrees F.)
Raymond soils have a mean annual air temperature range of 0 to 2 degrees C. (32 to 36 degrees F.)
GEOGRAPHIC SETTING:
Elevation: 100 to 600 meters (325 to 1970 feet)
Parent material: gravelly loamy colluvium over residuum weathered from slate
Landform: mountain slopes, hillslopes
Slope: 12 to 50 percent
Mean annual precipitation: 300 to 600 mm (12 to 24 in)
Mean annual air temperature: -6 to -1 degrees C. (21 to 30 degrees F.)
Frost free period: 70 to 90 days
GEOGRAPHICALLY ASSOCIATED SOILS: These are the
Amigak,
Aniruk,
Aullasik,
Iksrukkaa,
Iyagak,
Niakuk,
Nunapik,
Stovecreek, Tenmileriver, Ugguktuk, and Ungalik soils.
Amigak soils have aquic conditions starting between 0 to 25 cm (0 to 10 in), have a reduced matrix within 65 cm (26 in), lack lithic contact within 200 cm (79 in), lack a fragmental layer, have a histic epipedon, have cryoturbation, and occur on backslopes and footslopes
Aniruk soils lack lithic contact within 200 cm (79 in), lack a fragmental layer, and occur on mountainflanks, upper third
Aullasik soils lack a fragmental layer, have an umbric epipedon, and occur on mountainflanks, center third
Iksrukkaa soils have a paralithic contact at depths between 50 to 100 cm (20 to 40 in), lack a fragmental layer, have a folistic epipedon, lack a cambic horizon, and occur on backslopes and shoulders
Iyagak soils lack lithic contact within 200 cm (79 in), have a fragmental layer starting at depths between 25 to 59 cm (10 to 23 in), have a fragmental particle size class, and occur on swales
Niakuk soils have a lithic contact at depths between 100 to 150 cm (40 to 60 in), have a fragmental layer starting at depths between 20 to 73 cm (8 to 29 in), have a coarse-loamy over fragmental particle size class, and occur on mountainflanks, upper and center thirds
Nunapik soils have permafrost, have aquic conditions starting between 0 and 25 cm (0 and 10 in), have a reduced matrix within 50 cm (20 in), lack lithic contact within 200 cm (79 in), lack a fragmental layer, have a histic epipedon, have a fine-loamy particle size class, have an isotic mineralogy class, have a gelic soil temperature regime, and occur on saddles, mounds on nose slopes, and mounds on mountainflanks, upper third
Stovecreek soils have aquic conditions starting between 0 and 25 cm (0 and 10 in), have a reduced matrix within 70 cm (28 in), lack lithic contact within 200 cm (79 in), lack a fragmental layer, have an umbric epipedon, have a coarse-loamy particle size class, have an isotic mineralogy class, and occur on drainageways
Tenmileriver soils lack lithic contact within 200 cm (79 in), lack a fragmental layer, have an umbric epipedon, have andic soil properties, have a medial over loamy-skeletal particle size class, have an acid reaction class, have a gelic soil temperature regime, and occur on footslopes, backslopes, and mountainflanks, lower third
Ugguktuk soils have a lithic contact at depths between 50 to 100 cm (20 to 40 in), have aquic conditions starting between 25 to 50 cm (10 to 20 in), have a reduced matrix starting within 50 cm (20 in), lack a fragmental layer, have an acid reaction class, and occur on saddles and broad ridges
Ungalik soils have a paralithic contact at depths between 150 to 200 cm (60 to 79 in), lack a fragmental layer, have a mollic epipedon, have a fine-loamy particle size class, and occur on headslopes and mountainflanks, center third
DRAINAGE AND SATURATED HYDRAULIC CONDUCTIVITY:
Drainage class: well drained
Saturated Hydraulic Conductivity: very high in the Oe horizon, moderately high to high in the A, Bw, and C2 horizons, very high in the C1 horizon
Permeability: rapid to very rapid in the Oe horizon, moderate to rapid in the A, Bw, and C2 horizons, very rapid in the C1 horizon
Runoff: medium
USE AND VEGETATION:
Use: wildlife habitat, recreation, and subsistence
Native vegetation: Schreber's big red stem moss, eightpetal mountain-avens, reindeer lichen, netleaf willow, greygreen reindeer lichen, Flavocetraria cucullata, black crowberry, sphagnum, dwarf birch, larkspurleaf monkshood, tealeaf willow, narrowleaf arnica, golden asahinea lichen, boreal sagebrush, arctic lupine, bog blueberry, snow lichen, elegant Indian paintbrush, Sitka alder, alpine bistort
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: 29 to 104 cm (11 to 41 in)
Ochric epipedon: 0 to 11 cm (0 to 4 in) (Oe and A horizons)
Cambic horizon: 11 to 50 cm (4 to 20 in) (Bw horizon)
Lithologic discontinuity: 170 to 195 cm (67 to 77 in) (2R horizon)
Lithic contact: 170 to 195 cm (67 to 77 in) (2R horizon)
ADDITIONAL DATA:
User pedon ID: 2021AK180915
National Cooperative Soil Survey
U.S.A.