LOCATION TEACREEK                AK

Established Series
MPS/SAS/TJR
02/2022

TEACREEK SERIES

Landscape--hills, mountains
Landform--hillslopes, mountain slopes
Slope--5 to 45 percent
Parent material--colluvium
Mean annual precipitation--about 430 mm
Mean annual air temperature--about -3 degrees C
Depth class--very deep
Drainage class--poorly drained
Soil moisture regime--aquic
Soil temperature regime--cryic
Soil moisture subclass--typic

TAXONOMIC CLASS: Loamy-skeletal, mixed, superactive Aquic Haplocryepts

TYPICAL PEDON: Teacreek silt loam on a southeast linear, convex on a slope of 24 percent at an elevation of 269 m (The soil was moist from 0 to 150 when described on June 19, 2018.)

Oa--0 to 4 cm; highly decomposed plant material, brown (7.5YR 4/2) dry, very dark brown (7.5YR 2.5/2) moist; many very fine and common fine and medium roots; very strongly acid (pH 4.5); abrupt smooth boundary

E--4 to 17 cm; silt loam, 70 percent light olive gray (5Y 6/2) and 30 percent light yellowish brown (10YR 6/4) dry, 70 percent olive gray (5Y 4/2) and 30 percent dark yellowish brown (10YR 4/4) moist; weak medium subangular blocky structure; firm, nonsticky, slightly plastic; many very fine roots and common medium and fine roots; common fine irregular pores; 2 percent fine prominent strongly cemented strong brown (7.5YR 4/6) masses of oxidized iron with sharp boundaries between peds; 5 percent gravel; strongly acid (pH 5.5); abrupt wavy boundary

Bw--17 to 25 cm; gravelly silt loam, yellowish brown (10YR 5/4) dry, dark yellowish brown (10YR 3/4) moist; weak fine granular structure; few very fine irregular pores; very friable, nonsticky, nonplastic; common very fine and fine roots; 2 percent cobbles, 15 percent gravel; moderately acid (pH 6.0); abrupt broken boundary

Cg--25 to 40 cm; very gravelly silt loam, light brownish gray (2.5Y 6/2) dry, dark grayish brown (2.5Y 4/2) moist; massive; friable, slightly sticky, nonplastic; common very fine and fine roots; 10 percent cobbles, 25 percent gravel; moderately acid (pH 6.0); clear wavy boundary

C--40 to 150 cm; very cobbly silt loam, light yellowish brown (2.5Y 6/3) dry, olive brown (2.5Y 4/3) moist; massive; friable; 20 percent cobbles, 25 percent gravel; moderately acid (pH 6.0)

TYPE LOCATION: Nome Census Area, Alaska latitude 63.5768010 longitude -160.7349750 degrees, datum WGS84 (coordinates determined with a GPS unit)

RANGE IN CHARACTERISTICS:
Mean annual soil temperature--0 to 3 degrees C
Soil moisture control section--saturated for at least two weeks during the growing season from between 0 and 25 cm to between 25 and 50 cm (aquic soil moisture regime)
Thickness of ochric epipedon--4 to 15 cm
Thickness of cambic horizon--20 to 30 cm
Depth to redoximorphic iron concentrations--0 to 60 cm
Depth to depleted matrix--0 to 25 cm
Depth to aquic conditions--0 to 25 cm

Particle Size Control Section:
*Clay--12 to 22 percent
*Total fragments--35 to 60 percent subangular gravels and cobbles

Oa horizon
Thickness--2 to 10 cm

Bg horizon
Hue--10YR or 5Y
Value--4 or 5 moist, 6 or 7 dry
Chroma-1 or 2
Fine-earth texture--silt loam, silt
Clay--6 to 14 percent
Sand--5 to 20 percent
Organic carbon--3 to 5 percent
Total rock fragment content--0 to 5 percent gravel
Reaction--4.8 to 5.7
Thickness--10 to 15 cm

Bw horizon
Hue--10YR or 2.5Y
Value--3 to 5 moist. 5 to 7 dry
Chroma--3 or 4
Clay--8 to 18 percent
Sand--8 to 15 percent
Organic carbon--3 to 5 percent
Total rock fragment content--0 to 20 percent
Total gravel content--0 to 20 percent gravel
Total cobble content--0 to 5 percent cobble
Reaction--5.0 to 6.0
Thickness--8 to 20 cm

Cg horizon
Hue--2.5Y or 5Y
Value--4 or 5 moist, 6 or 7 dry
Chroma--1 to 2
Fine-earth texture--silt loam, loam
Clay--13 to 22 percent
Sand--20 to 45 percent
Organic carbon--1 to 3 percent
Total rock fragment content--35 to 55 percent
Total gravel content--25 to 40 percent
Total cobble content--10 to 15 percent
Reaction--5.6 to 6.5
Thickness--10 to 15 cm

C horizon
Value--3 or 4 moist, 5 or 6 dry
Chroma--2 or 3
Fine-earth texture--silt loam, sandy loam
Clay--10 to 22 percent
Sand--30 to 75 percent
Organic carbon--1 to 2 percent
Total rock fragment content--35 to 55 percent
Total gravel content--25 to 55 percent
Total cobble content--0 to 20 percent
Reaction--5.5 to 6.5
Thickness--90 to 110 cm

COMPETING SERIES: none

GEOGRAPHIC SETTING:
*Elevation--5 to 750 m
*Climate--warm, moist summers; cold, dry winters
*Mean annual precipitation--300 to 680 mm
*Mean annual air temperature-- -5 to -1 degrees C
*Frost-free period--55 to 90 days

GEOGRAPHICALLY ASSOCIATED SOILS:
* Cranberryslough--permafrost present, histic epipedon, fine-loamy particle-class size, gelic soil temperature regime; hillslopes and saddles
* Pointcreek--folistic epipedon, no aquic conditions present; footslopes on hills
* Maggok--coarse loamy particle size class; evidence of illuvial sesquioxides, no aquic conditions present; low ridges and hillslopes
* Kanguq--isotic mineralogy class, lithological discontinuity, moderately deep to paralithic contact, hillslopes and mountain slopes
* Apun--permafrost present, histic epipedon, coarse-loamy particle-size class, gelic soil temperature regime; hillslopes and mountain slopes
* Cascadecreek--isotic mineralogy, well drained; hillslopes, and mountain slopes
* Golsovia--isotic mineralogy, deep to paralithic contact; hillslopes, valley sides, and escarpments
* Peke--depth to aquic conditions 25 to 50 cm, coarse loamy particle size class, clay does not range above 16 percent; valleys and headslopes
* Ottercreek--aquic conditions throughout profile, no cambic horizon present; baseslopes on mountains

DRAINAGE AND SATURATED HYDRAULIC CONDUCTIVITY:
*Drainage class--poorly drained
*Saturation during normal years--saturated from a depth of 0 to 25 cm to a depth of 25 to 50 cm for at least two weeks during the growing season
*Saturated hydraulic conductivity (Ksat)--very high in the organic soil surface, high to moderately high throughout the rest of the profile

USE AND VEGETATION:
Use--wildlife habitat, recreation, subsistence
Potential native vegetation--tall bluebells, bluejoint, Altai fescue, Bigelow's sedge, dwarf birch, bog blueberry, tealeaf willow, marsh Labrador tea, black crowberry, lingonberry, arctic raspberry, fireweed, arctic sweet coltsfeet, star reindeer lichen, greygreen reindeer lichen, reindeer lichen, grayleaf willow, tall Jacob's-ladder, knights plume moss, splendid feather moss, Moss, Schreber's big red stem moss, beaverd spirea, Siberian alder, stiff clubmoss, spreading woodfern, currant, common cowparsnip, slimstem reedgrass,

DISTRIBUTION AND EXTENT: Nulato Hills-Southern Seward Peninsula Highlands, Alaska; MLRA 240; moderate extent

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

SERIES ESTABLISHED: Nulato Hills BLM area, Nome Census Area, Alaska; 2021

REMARKS:
Diagnostic horizons and features recognized in this pedon
*Particle-size control section--zone from 29 to 104 cm
*Ochric epipedon--zone from 0 to 4 cm
*Depleted matrix--zone from 4 to 17 cm and 25 to 40 cm
*Redoximorphic depletions with chroma of 2 or less--zone from 4 to 17 cm
*Redoximorphic concentrations--zone from 4 to 17 cm
*Aquic conditions--zone from 4 to 17 cm and 25 to 40 cm
*Cambic horizon--zone from 4 to 25 cm

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National Cooperative Soil Survey
U.S.A.