LOCATION SKARN                   AK

Established Series
IRD. ATD/NDP/SCD
02/2022

SKARN SERIES

Landscape--mountains
Landform--mountain slopes
Slope--5 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, calcareous Typic Cryorthents

TYPICAL PEDON: Skarn gravelly sandy loam, forested, on a mountain slope of 35 percent at an elevation of 219 m (When described on June 6, 2013, the soil was moist from the surface to a depth of 104 cm.)

Oe--0 to 8 cm; moderately decomposed plant material; very strongly acid (pH 4.9); clear smooth boundary

A--8 to 14 cm; gravelly sandy loam, light yellowish brown (2.5Y 6/3) dry, olive brown (2.5Y 4/3) moist; weak fine granular structure; slightly hard, friable, nonsticky and nonplastic; common very fine, fine, medium, and coarse roots throughout; common very fine and fine irregular pores; 30 percent gravel; noneffervescent (HCL, 1N); strongly acid (pH 5.5); gradual smooth boundary

C1--14 to 60 cm; very gravelly sandy clay loam, light gray (5Y 7/1) dry, gray (5Y 5/1) moist; massive; slightly hard, friable, slightly sticky and slightly plastic; common very fine, fine, and medium roots throughout; common very fine and fine irregular pores; 5 percent subangular cobbles and 35 percent subangular gravel; slightly effervescent (HCL, 1N); moderately alkaline (pH 7.9); gradual smooth boundary

C2--60 to 104 cm; very gravelly sandy clay loam, light gray (5Y 7/1) dry, gray (5Y 5/1) moist; 3 percent medium light olive brown (2.5Y 5/6) mottles; massive; slightly hard, friable, slightly sticky and slightly plastic; common very fine and fine roots throughout; common very fine and fine irregular pores; 5 percent subangular cobbles and 35 percent subangular gravel; slightly effervescent (HCL, 1N); moderately alkaline (pH 8.0); clear smooth boundary

2R--104 cm; bedrock

TYPE LOCATION: Glacier Bay National Park and Preserve-Gustavus Area, Alaska; Hoonah-Angoon Census Area; latitude 58.6804561, longitude -136.3719642, 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)
Depth to lithic contact--100 to 150 cm (deep)

Particle-size control section
*Clay content--18 to 25 percent
*Total rock fragment content--35 to 55 percent

Oe horizon
Thickness--0 to 12 cm

A horizon
Hue--10YR or 2.5Y moist or dry
Value--2 to 4 moist, 4 to 6 dry
Chroma--2 to 4 moist or dry
Clay content--15 to 18 percent
Total rock fragment content--15 to 35 percent
Gravel content--15 to 35 percent
Reaction (pH)--5.5 to 6.1
Thickness--5 to 13 cm

C horizon
Hue--10YR to 5Y moist or dry
Value--3 to 5 moist, 5 to 7 dry
Chroma--1 to 4 moist or dry
Clay content--20 to 25 percent
Total rock fragment content--35 to 55 percent
Gravel content--35 to 50 percent
Cobble content--0 to 8 percent
Reaction (pH)--6.8 to 8.1
Effervescence--slightly effervescent, strongly effervescent
Thickness--30 to 90 cm

COMPETING SERIES:
Coville, Tyeen--no lithic contact within a depth of more than 150 cm (very deep)

GEOGRAPHIC SETTING:
Elevation--30 to 350 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:
Kadachan--no lithic contact within a depth of more than 150 cm (very deep); in drainageways of similar landforms
Polkapenn--25 to 50 cm (shallow) to a lithic contact; on adjacent landforms
Seclusion--25 to 50 cm (shallow) to a lithic contact; on escarpments of similar landforms

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

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
*Depth to lithic contact--104 cm
*Free carbonates--zone from 14 to 104 cm
*Depth to lithologic discontinuity--104 cm
*Particle-size control section--zone from 33 to 104 cm

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National Cooperative Soil Survey
U.S.A.