LOCATION SECLUSION               AK

Established Series
IRD. NDP/SCD
02/2022

SECLUSION SERIES

Landscape--mountains
Landform--escarpments
Slope--5 to 100 percent
Parent material--colluvium over residuum
Mean annual precipitation--about 1400 mm
Mean annual air temperature--about 5 degrees C
Depth class--shallow
Drainage class--well drained
Soil moisture regime--udic
Soil temperature regime--cryic
Soil moisture subclass--typic

TAXONOMIC CLASS: Loamy-skeletal, mixed, superactive, calcareous Lithic Cryorthents

TYPICAL PEDON: Seclusion very gravelly sandy loam in an area of scrub, on a mountain escarpment, on a slope of 82 percent at an elevation of 19 m (When described on August 29, 2013, the soil was moist from the surface to a depth of 40 cm.)

Oe--0 to 9 cm; moderately decomposed plant material; strongly acid (pH 5.2); clear smooth boundary

AC--9 to 15 cm; very gravelly sandy loam, pale yellow (2.5Y 7/3) dry, light olive brown (2.5Y 5/3) moist; weak fine granular structure; soft, very friable, nonsticky and nonplastic; common very fine, fine, medium, coarse, and very coarse roots throughout; common very fine and fine irregular pores ; 10 percent cobbles and 30 percent gravel; slightly effervescent (HCL, 1N); moderately alkaline (pH 7.9); gradual smooth boundary

C--15 to 40 cm; very gravelly sandy loam, pale yellow (2.5Y 7/3) dry, light olive brown (2.5Y 5/3) moist; single grain; slightly hard, friable, nonsticky and nonplastic; common fine and medium roots throughout; common very fine and fine irregular pores; 10 percent cobbles and 35 percent gravel; strongly effervescent (HCL, 1N); strongly alkaline (pH 8.5); clear smooth boundary

2R--40 cm; bedrock

TYPE LOCATION: Glacier Bay National Park and Preserve-Gustavus Area, Alaska; Hoonah-Angoon Census Area; latitude 58.8199448, longitude -136.3498519, 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--25 to 50 cm (shallow)

Particle-size control section
*Clay content--5 to 10 percent
*Total rock fragment content--35 to 60 percent

Oe horizon
Thickness--1 to 13 cm

A or AC horizon
Hue--10YR or 2.5Y moist or dry
Value--2 to 5 moist, 4 to 7 dry
Chroma--2 to 4 moist or dry
Clay content--5 to 10 percent
Total rock fragment content--35 to 60 percent
Gravel content--15 to 50 percent
Cobble content--5 to 15 percent
Reaction (pH)--6.0 to 7.9
Effervescence--very slightly effervescent, slightly effervescent
Thickness--5 to 15 cm

C horizon
Hue--10YR or 2.5Y moist or dry
Value--4 or 5 moist, 6 or 7 dry
Chroma--3 to 6 moist or dry
Clay content--5 to 8 percent
Total rock fragment content--35 to 60 percent
Gravel content--30 to 50 percent
Cobble content--5 to 15 percent
Reaction (pH)--7.0 to 8.5
Effervescence--slightly effervescent, strongly effervescent
Thickness--15 to 30 cm

COMPETING SERIES:
Starman--lithic contact within 25 cm of soil surface (very shallow); underlain by calcareous sandstone

GEOGRAPHIC SETTING:
Elevation--20 to 150 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:
Enigma--50 to 100 cm (moderately deep) to a lithic contact; in avalanche chutes of similar landforms
Kadachan--pH of 5.1 to 7.3 throughout control section; in drainageways of similar landforms
Skarn--100 to 150 cm (deep) to a lithic contact; on similar landforms

DRAINAGE AND SATURATED HYDRAULIC CONDUCTIVITY:
Drainage class--well drained
Depth to saturation in normal years--more than 40 cm
Flooding--none
Ponding--none
Saturated hydraulic conductivity (Ksat)--high in AC and C horizons

USE AND VEGETATION:
Use--wildlife habitat, recreation, subsistence
Potential native vegetation--Sitka alder, bride's feathers, common ladyfern, spreading woodfern, splendid feather moss, Schreber's big red stem moss, goose neck moss, salmonberry, Barclay's willow, red elderberry, Sitka willow

DISTRIBUTION AND EXTENT: Alexander Archipelago-Gulf of Alaska Coast, Alaska; MLRA 220; large 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
*Free carbonates--zone from 9 to 40 cm
*Depth to lithic contact--40 cm
*Depth to lithologic discontinuity--40 cm
*Particle-size control section--zone from 9 to 40 cm

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National Cooperative Soil Survey
U.S.A.