LOCATION NAGYAGAT                AK

Established Series
SAS/ABD/MPR
05/2022

NAGYAGAT SERIES

Landscape--mountains, hills
Landform--mountain slopes, hillslopes
Slope--0 to 25 percent
Parent material--drift over residuum
Mean annual precipitation--about 1000 mm
Mean annual air temperature--about 0 degrees C
Depth class--moderately deep
Drainage class--well drained
Soil moisture regime--udic
Soil temperature regime--cryic
Soil moisture subclass--typic

TAXONOMIC CLASS: Loamy-skeletal, isotic Typic Humicryepts

TYPICAL PEDON: Nagyagat very gravelly sandy loam on a northeast-facing, convex, linear mountain summit, on a slope of 3 percent at an elevation of 778 m (The soil was moist throughout when described on July 20, 2012.)

A--0 to 18 cm; very gravelly sandy loam, dark grayish brown (10YR 4/2) dry, very dark brown (10YR 2/2) moist; weak fine granular structure; soft, very friable, nonsticky and nonplastic; many very fine and common fine and medium roots; 35 percent subangular gravel and 10 percent subangular cobbles; extremely acid (pH 4.4); clear smooth boundary

BC--18 to 45 cm; very gravelly sandy loam, light yellowish brown (2.5Y 6/4) dry, olive brown (2.5Y 4/4) moist; weak medium subangular blocky structure; slightly hard, friable, nonsticky and nonplastic; common very fine and fine roots; 35 percent subangular gravel and 10 percent subangular cobbles; strongly acid (pH 5.3); abrupt smooth boundary

2C--45 to 60 cm; extremely channery coarse sand, pale yellow (2.5Y 7/4) dry, light olive brown (2.5Y 5/4) moist; single grain; loose, nonsticky and nonplastic; common very fine roots; 50 percent angular channers and 35 percent angular flagstones; slightly acid (pH 6.2); clear irregular boundary

2R--60 cm; bedrock

TYPE LOCATION: Dillingham Census Area, Alaska, about 135 km north-northwest of the city of Dillingham; latitude 60.0315234 degrees north, longitude 159.8413644 degrees west, datum WGS 84 (coordinates determined with a GPS)

RANGE IN CHARACTERISTICS:
Mean annual soil temperature--0 to 2 degrees C
Soil moisture control section--dry less than 45 consecutive days in June through October
Depth to lithic contact--50 to 100 cm (moderately deep)
Lithology of rock fragments in lower part--sedimentary, volcanic

Particle-size control section
*Clay content--1 to 18 percent
*Sand content--55 to 80 percent
*Total rock fragment content--35 to 85 percent
*Content of fine sand or coarser in loamy-skeletal material--more than 50 percent
*Sodium fluoride pH--8.4 to 11.6
*Ratio of 1500 kPa water to measured clay--0.6 to 6.0

All mineral horizons
*Base saturation--0 to 10 percent

A horizon
Hue--7.5YR, 10YR
Value--2 or 3 moist, 4 or 5 dry
Fine-earth texture--silt loam, sandy loam
Clay content--5 to 20 percent
Reaction--4.4 to 6.1
Total rock fragment content--20 to 45 percent
Gravel content--20 to 40 percent
Cobble content--0 to 10 percent
Thickness--18 to 51 cm
Bulk density--1.1 to 1.5 g/cm3

BC horizon
Value--3 to 5 moist, 5 to 7 dry
Chroma--2 to 4 moist
Clay content--5 to 20 percent
Reaction--5.0 to 6.5
Total rock fragment content--35 to 60 percent
Gravel content--35 to 55 percent
Cobble content--0 to 10 percent
Thickness--15 to 30 cm
Content of fine sand or coarser--more than 50 percent

2C horizon
Hue--10YR, 2.5Y
Value--3 or 4 moist, 5 or 6 dry
Chroma--2 to 4 moist
Fine-earth texture--coarse sand, loamy sand, sandy loam
Clay content--1 to 12 percent
Reaction--5.5 to 6.5
Total rock fragment content--35 to 85 percent
Gravel content--0 to 55 percent
Cobble content--0 to 5 percent
Channer content--5 to 50 percent
Flagstone content--5 to 35 percent
Thickness--2 to 52 cm

COMPETING SERIES:
Bigelow, Buchia--no lithic contact within a depth of 150 cm
Causewa--18 to 27 percent clay in particle-size control section
Crannler--mean annual soil temperature higher than 4 degrees C
Henline--mean annual soil temperature higher than 6 degrees C
Hossick, Mirror--no channers or flagstones in particle size control section

GEOGRAPHIC SETTING:
Elevation--20 to 900 m
Climate--warm, moist summers; cold, moist winters
Mean annual precipitation--620 to 2100 mm
Mean annual air temperature-- -3.6 to 1.8 degrees C
Frost-free period--70 to 140 days

GEOGRAPHICALLY ASSOCIATED SOILS:
Mitlak--aquic conditions below a depth of 50 cm; andic soil properties; plains and lower mountain slopes
Kashaiak--less than 50 cm (shallow) to lithic contact; similar landscape positions
Klak--more than 150 cm (very deep); andic soil properties; lower mountain slopes
Buchia--more than 150 cm (very deep); similar landscape positions
Twin Hills--50 to 100 cm (moderately deep) to paralithic contact; hills
Nagugun--more than 150 cm (very deep) to lithic contact; spodic horizon; andic soil properties; glaciated plains

DRAINAGE AND SATURATED HYDRAULIC CONDUCTIVITY:
Drainage class--well drained
Saturated hydraulic conductivity (Ksat)--moderately high or high in the A and BC horizons, high or very high in the 2C horizon

USE AND VEGETATION:
Use--wildlife habitat, recreation, subsistence
Potential natural vegetation--cup lichen, greygreen reindeer lichen, star reindeer lichen, pincushion plant, eightpetal mountain-avens, black crowberry, marsh Labrador tea, arctic willow, snow lichen

DISTRIBUTION AND EXTENT: Ahklun Mountains, Alaska; MLRA 237; moderate extent

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

SERIES ESTABLISHED: Togiak National Wildlife Refuge, Dillingham Census Area, Alaska; 2019

REMARKS:
Diagnostic horizons and other features in this pedon
*Particle-size control section--zone from 25 to 60 cm
*Umbric epipedon--A horizon
*Cambic horizon-BC horizon
*Depth to lithic bedrock--60 cm
*Depth to lithologic discontinuity-top of 2C horizon

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National Cooperative Soil Survey
U.S.A.