LOCATION ASTROLABLE              AK

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

ASTROLABLE SERIES

Landscape--shore complex
Landform--tidal marshes and low flood plains
Slope--0 to 3 percent
Parent material--marine deposits and alluvium
Mean annual precipitation--about 2500 mm
Mean annual air temperature--about 6 degrees C
Depth class--very deep
Drainage class--very poorly drained
Soil moisture regime--aquic
Soil temperature regime--cryic
Soil moisture subclass--typic

TAXONOMIC CLASS: Sandy-skeletal, mixed Typic Cryaquents

TYPICAL PEDON: Astrolable sandy clay loam on a tidal marsh, on a slope of 0 percent at sea level (When described on July 02, 2013, the soil was wet throughout.)

Cg1--0 to 25 cm; sandy clay loam, light olive gray (5Y 6/2) dry, olive gray (5Y 4/2) moist; massive; slightly hard, friable, slightly sticky and slightly plastic; common very fine and coarse roots throughout; few very fine and fine interstitial pores; 15 percent coarse masses of reduced iron, dark gray (2.5Y 4/1) moist, and 20 percent coarse masses of oxidized iron, strong brown (7.5YR 4/6) moist; 10 percent coarse gravel; moderately saline (electrical conductivity of 14 dS/m); neutral (pH 7.2); abrupt smooth boundary

Cg2--25 to 150 cm; variegated very gravelly coarse sand; single grain; loose, nonsticky and nonplastic; common very fine, fine, and medium roots; few very fine interstitial pores; 60 percent coarse gravel; strongly saline (electrical conductivity of 16 dS/m); slightly alkaline (pH 7.5)

TYPE LOCATION: Glacier Bay National Park and Preserve-Gustavus Area, Alaska; Hoonah-Angoon Census Area; latitude 58.3777790, longitude -136.3251030, datum WGS84 (coordinates determined by a GPS unit)

RANGE IN CHARACTERISTICS:
Mean annual soil temperature--1 to 7 degrees C
Soil moisture control section--aquic conditions within 25 cm of the soil surface, year round
Depth to redoximorphic iron concentrations and depletions--within 45 cm of the soil surface (having more than 5 percent concentrations and depletions in the horizon)
Sodium adsorption ratio--more than 8 throughout
Electrical conductivity--more than 12 dS/m throughout

Particle-size control section
*Clay content--0 to 4 percent
*Total rock fragment content--35 to 85 percent

Cg1, C1 horizons
Hue--2.5YR to 10YR, or variegated, moist; 5Y to 5BG reduced
Value--2 to 5 moist, 4 to 7 dry
Chroma--1 to 6 moist or dry
Fine-earth texture--sandy clay loam, loam, sandy loam, or fine sandy loam
Clay content--3 to 25 percent
Gravel content--10 to 15 percent
Reaction (pH)--6.2 to 7.6
Electrical conductivity--8 to 15 dS/m
Thickness--3 to 30 cm

Cg2, C2, C3, C4 horizons
Hue--2.5YR to 10YR, or variegated, moist or dry
Value--3 to 5 moist, 5 to 7 dry
Chroma--3 to 6 moist or dry
Fine-earth texture--sand, coarse sand
Clay content--0 to 3 percent
Gravel content--35 to 85 percent
Reaction (pH)--7.2 to 8.0
Effervescence--noneffervescent to strongly effervescent
Electrical conductivity--16 to 26 dS/m
Thickness--25 to 145 cm

COMPETING SERIES:
Anan--O horizon consisting of forest litter; no saltwater influence
Ustiugof--pH of 5.6 to 7.3; lithologic discontinuity

GEOGRAPHIC SETTING:
Elevation--0 to 20 m
Climate--cool, moist summers; mild, wet winters
Mean annual precipitation--850 to 3350 mm
Mean annual air temperature--1 to 7 degrees C
Frost-free period--90 to 154 days

GEOGRAPHICALLY ASSOCIATED SOILS:
Beartrack--calcareous throughout particle-size control section; no rock fragments throughout; on similar landforms
Fingerock--50 to 100 cm (moderately well drained) to aquic conditions; on similar landforms
Lituya, Murkbay--no saturation or aquic conditions; on similar landforms
Strawberry--25 to 50 cm (somewhat poorly drained) to aquic conditions; on similar landforms

DRAINAGE AND SATURATED HYDRAULIC CONDUCTIVITY:
Drainage class--very poorly drained
Depth to saturation in normal years--within 25 cm of the soil surface, year round
Flooding--very frequent, very brief periods; influenced by tides twice daily
Saturated hydraulic conductivity (Ksat)--moderately high in Cg1 horizon, very high in Cg2 horizon

USE AND VEGETATION:
Use--wildlife habitat, recreation
Potential natural vegetation--Lyngbye's sedge, sea milkwort, silverweed cinquefoil, goose tongue, spike bentgrass, cinquefoil, seacoast angelica, tufted hairgrass, water sedge, red fescue, beach pea, American dunegrass

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 in this pedon
*Ochric epipedon
*Redoximorphic iron concentrations--zone from the surface to a depth of 25 cm
*Redoximorphic iron depletions that have chroma of 2 or less--zone from the surface to a depth of 25 cm
*Reduced matrix--zone from the surface to a depth of 150 cm
*Aquic conditions--zone from the surface to a depth of 150 cm
*Particle-size control section--zone from 25 to 100 cm

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National Cooperative Soil Survey
U.S.A.