LOCATION NUNATAK                 AK

Established Series
IRD. NDP/SCD
05/2022

NUNATAK SERIES

Landscape--mountains
Landform--mountain slopes
Slope--25 to 70 percent
Parent material--colluvium over residuum
Mean annual precipitation--about 1400 mm
Mean annual air temperature--about 5 degrees C
Depth class--deep
Drainage class--well drained
Soil moisture regime--udic
Soil temperature regime--cryic
Soil moisture subclass--typic

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

TYPICAL PEDON: Nunatak cobbly sandy loam, forested, on a mountain slope of 60 percent at an elevation of 264 m (When described on July 23, 2013, the soil was moist throughout.)

Oe--0 to 3 cm; moderately decomposed plant material; strongly acid (pH 5.3); clear smooth boundary

A--3 to 10 cm; gravelly sandy loam, gray (10YR 5/1) dry, very dark gray (10YR 3/1) moist; moderate fine granular structure; soft, very friable, nonsticky and nonplastic; many very fine, fine, medium, and coarse and common very coarse roots throughout; common very fine and fine irregular pore s; 20 percent gravel and 10 percent cobbles; noneffervescent; moderately acid (pH 5.7); clear smooth boundary

Bw--10 to 36 cm; very gravelly coarse sandy loam, reddish yellow (7.5YR 6/6) dry, strong brown (7.5YR 4/6) moist; moderate medium subangular blocky structure; slightly hard, friable, nonsticky and nonplastic; common very fine, fine, medium, coarse, and very coarse roots throughout; common very fine and fine irregular pores; 5 percent cobbles and 50 percent gravel; noneffervescent; slightly acid (pH 6.4); clear wavy boundary

C--36 to 113 cm; very gravelly coarse sandy loam, light gray (2.5Y 7/2) dry, grayish brown (2.5Y 5/2) moist; massive; slightly hard, friable, nonsticky and nonplastic; common fine, medium, and coarse roots in upper part; common very fine and fine irregular pores; 18 percent cobbles and 40 percent gravel; noneffervescent; neutral (pH 7.3); abrupt wavy boundary

2R--113 cm; bedrock

TYPE LOCATION: Glacier Bay National Park and Preserve-Gustavus Area, Alaska; Hoonah-Angoon Census Area; latitude 58.5537575, longitude -136.4776079, datum WGS84 (coordinates determined by a GPS unit)

RANGE IN CHARACTERISTICS:
Mean annual soil temperature--1 to 7 degrees C
Soil moisture control section--dry less than 45 consecutive days in June through October (udic)
Thickness of cambic horizon--15 to 35 cm
Depth to lithic contact--100 to 150 cm

Particle-size control section
*Clay content--5 to 10 percent
*Total rock fragment content--35 to 65 percent

Oe horizon
Thickness--0 to 8 cm

A horizon
Value--2 to 4 moist, 4 to 6 dry
Chroma--2 to 6 moist or dry
Fine-earth texture--coarse sandy loam, sandy loam
Clay content--6 to 10 percent
Total rock fragment content--13 to 35 percent
Gravel content--16 to 32 percent
Cobble content--8 to 13 percent
Reaction (pH)--5.2 to 5.7
Thickness--5 to 15 cm

Bw horizon
Hue--7.5YR or 10YR moist or dry
Value--3 or 4 moist, 5 or 6 dry
Chroma--4 or 6 moist or dry
Fine-earth texture--coarse sandy loam, sandy loam
Clay content--5 to 10 percent
Total rock fragment content--35 to 65 percent
Gravel content--30 to 65 percent
Cobble content--3 to 7 percent
Reaction (pH)--5.3 to 6.7
Thickness--15 to 35 cm

C horizon
Hue--10YR to 5Y moist or dry
Value--3 to 5 moist, 5 to 7 dry
Chroma--2 to 6 moist or dry
Fine-earth texture--coarse sandy loam, sandy loam
Clay content--5 to 10 percent
Total rock fragment content--35 to 65 percent
Gravel content--30 to 65 percent
Cobble content--15 to 35 percent
Reaction (pH)--6.3 to 7.3
Thickness--55 to 80 cm

COMPETING SERIES:
Basaltlake, Butchlake--lithologic discontinuity; no lithic contact within a depth of more than 150 cm (very deep)
Cuberant--50 to 100 cm (moderately deep) to a lithic contact
Enentah--albic and spodic horizons
Garlet--albic horizon; pedogenic accumulations of calcium carbonate
Gromes, Kegsprings--no lithic contact within a depth of more than 150 cm (very deep)
Mountedith--albic horizon
Nooney--elevation of more than 1600 m
Soakpak--mean annual soil temperature below 0 degrees C
Storm--albic horizon; no lithic contact within a depth of more than 150 cm (very deep)
Targhee--50 to 100 cm (moderately deep) to a lithic contact
Telay--no lithic contact within a depth of more than 150 cm (very deep)

GEOGRAPHIC SETTING:
Elevation--20 to 280 m
Climate--cool, moist summers; mild, wet winters
Mean annual precipitation--850 to 1850 mm
Mean annual air temperature--0 to 9 degrees C
Frost-free period--90 to 154 days

GEOGRAPHICALLY ASSOCIATED SOILS:
Dagelet--50 to 100 cm (moderately deep) to a lithic contact; on similar landforms
Escures--50 to 100 cm (moderately deep) to a lithic contact; on adjacent escarpments
Polkapenn--25 to 50 cm (shallow) to a lithic contact; on adjacent hills

DRAINAGE AND SATURATED HYDRAULIC CONDUCTIVITY:
Drainage class--well drained
Depth to saturation in normal years--more than 100 cm year round
Flooding--none
Ponding--none
Saturated hydraulic conductivity (Ksat)--high or very high in A, Bw, and C horizons

USE AND VEGETATION:
Use--wildlife habitat, recreation, subsistence
Potential native vegetation--Sitka alder, western rattlesnake plantain, splendid feather moss, heartleaf twayblade, sidebells wintergreen, Sitka spruce, Schreber's big red stem moss, goose neck moss, strawberryleaf raspberry, western hemlock, Alaska blueberry, oval-leaf blueberry

DISTRIBUTION AND EXTENT: Alexander Archipelago-Gulf of Alaska Coast, Alaska; MLRA 220; moderate extent

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

SERIES ESTABLISHED: Glacier Bay National Park and Preserve-Gustavus Area, Alaska; 2020.

REMARKS:
Diagnostic horizons and other features recognized in this pedon
*Ochric epipedon
*Cambic horizon--zone from 10 to 36 cm
*Depth to lithologic discontinuity--113 cm
*Depth to lithic contact--113 cm
*Particle-size control section--zone from 28 to 103 cm

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National Cooperative Soil Survey
U.S.A.