LOCATION FLAPJACK                AK

Established Series
IRD. TDM/NDP/SCD
05/2022

FLAPJACK SERIES

Landscape--mountains
Landform--swales of mountain slopes
Slope--5 to 20 percent
Parent material--colluvium over residuum
Mean annual precipitation--about 1400 mm
Mean annual air temperature--about -2 degrees C
Depth class--moderately deep
Drainage class--somewhat poorly drained
Soil moisture regime--udic
Soil temperature regime--gelic
Soil moisture subclass--aquic

TAXONOMIC CLASS: Loamy-skeletal, mixed, superactive, acid, subgelic Oxyaquic Gelorthents

TYPICAL PEDON: Flapjack sandy loam in a swale of a mountain slope of 5 percent at an elevation of 407 m (When described on July 22, 2013, the soil was moist from the surface to a depth of 45 cm and wet from a depth of 45 to 64 cm.)

Oe--0 to 4 cm; moderately decomposed plant material; extremely acid (pH 4.4); clear smooth boundary

A--4 to 20 cm; extremely cobbly sandy loam, dark grayish brown (10YR 4/2) dry, very dark brown (10YR 2/2) moist; moderate fine granular structure; soft, very friable, nonsticky and nonplastic; common very fine, fine, and medium roots throughout; common very fine and fine interstitial pores; 20 percent medium gravel and 60 percent cobbles; very strongly acid (pH 4.7); gradual smooth boundary

C--20 to 64 cm; extremely cobbly sandy loam, light gray (5Y 7/2) dry, olive gray (5Y 5/2) moist; massive; slightly hard, friable, nonsticky and nonplastic; common fine roots throughout; common very fine and few fine interstitial pores; 15 percent cobbles and 45 percent medium gravel; very strongly acid (pH 4.9); clear wavy boundary

2R--64 cm; bedrock

TYPE LOCATION: Glacier Bay National Park and Preserve-Gustavus Area, Alaska; Hoonah-Angoon Census Area; latitude 58.5515101, longitude -136.5138256, datum WGS84 (coordinates determined by a GPS unit)

RANGE IN CHARACTERISTICS:
Mean annual soil temperature-- -2 to 1 degree C
Soil moisture control section--dry less than 45 consecutive days in June through October (udic)
Depth to lithic contact--50 to 100 cm

Particle-size control section
*Clay content--2 to 11 percent
*Total rock fragment content--50 to 82 percent

Oe horizon
Thickness--1 to 8 cm

A horizon
Value--2 to 4 moist, 4 to 6 dry
Chroma--2 to 6 moist or dry
Fine-earth texture--sandy loam, silt loam
Clay content--2 to 11 percent
Total rock fragment content--66 to 82 percent
Gravel content--15 to 25 percent
Cobble content--35 to 60 percent
Reaction (pH)--4.2 to 5.0
Thickness--10 to 17cm

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--sandy loam, silt loam
Clay content--2 to 10 percent
Total rock fragment content--50 to 64 percent
Gravel content--35 to 55 percent
Cobble content--15 to 25 percent
Reaction (pH)--4.5 to 5.5
Thickness--40 to 50 cm

COMPETING SERIES: None

GEOGRAPHIC SETTING:
Elevation--395 to 450 m
Climate--cool, moist summers; cold, wet winters
Mean annual precipitation--850 to 1850 mm
Mean annual air temperature-- -4.5 to 0 degrees C
Frost-free period--90 to 154 days

GEOGRAPHICALLY ASSOCIATED SOILS:
Woodlake--no aquic conditions within a depth of 150 cm; 50 to 100 cm (moderately deep) to a lithic contact; on similar landforms

DRAINAGE AND SATURATED HYDRAULIC CONDUCTIVITY:
Drainage class--somewhat poorly drained
Saturation in normal years--throughflow water table from a depth of 45 to 64 cm in spring, summer, and fall
Saturated hydraulic conductivity (Ksat)--moderately high in A and C horizons

USE AND VEGETATION:
Use--wildlife habitat, recreation
Potential natural vegetation--Sitka willow, Aleutian mountainheath, partridgefoot, western moss heather, copperbush, Sitka alder, Nootka lupine, common ladyfern, climacium moss, feather moss

DISTRIBUTION AND EXTENT: Alexander Archipelago-Gulf of Alaska Coast, Alaska; MLRA 220; small 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 in this pedon
*Ochric epipedon
*Depth to lithologic discontinuity--64 cm
*Depth to lithic contact--64 cm
*Aquic conditions--zone from 45 to 64 cm
*Particle-size control section--zone from 25 to 64 cm

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National Cooperative Soil Survey
U.S.A.