LOCATION ANCON AK
Established Series
IRD NDP/SCD
02/2022
ANCON SERIES
Landscape--drift plain
Landform--glaciated plains
Slope--0 to 25 percent
Parent material--till over residuum
Mean annual precipitation--about 2500 mm
Mean annual air temperature--about 6 degrees C
Depth class--deep to bedrock
Drainage class--moderately well drained
Soil moisture regime--udic
Soil temperature regime--cryic
Soil moisture subclass--aquic
TAXONOMIC CLASS: Coarse-loamy, mixed, superactive Aquic Haplocryods
TYPICAL PEDON: Ancon fine sandy loam on a glaciated plain, on a slope of 23 percent at an elevation of 30 m (When described on August 10, 2013, the soil was moist throughout.)
Oe--0 to 8 cm; moderately decomposed plant material; extremely acid (pH 4.1); clear smooth boundary
A--8 to 21 cm; fine sandy loam, dark grayish brown (10YR 4/2) dry, very dark brown (10YR 2/2) moist; moderate medium granular structure; soft, very friable, nonsticky and nonplastic; common very fine and very coarse and many fine, medium, and coarse roots throughout; common very fine and fine interstitial pores; extremely acid (pH 4.4); abrupt wavy boundary
E--21 to 24 cm; fine sandy loam, very pale brown (10YR 8/3) dry, pale brown (10YR 6/3) moist; moderate medium subangular blocky structure; soft, very friable, nonsticky and nonplastic; common very fine, fine, medium, and coarse roots throughout; common very fine and fine interstitial pores; very strongly acid (pH 4.5); abrupt broken boundary
Bs/Bhs--24 to 53 cm; fine sandy loam, 75 percent light brown (7.5YR 6/4) and 25 percent dark grayish brown (10YR 4/2) dry, 75 percent brown (7.5YR 4/4) and 25 percent very dark brown (10YR 2/2) moist; weak medium angular blocky structure; slightly hard, friable, nonsticky and nonplastic; few coarse and common very fine, fine, medium, and very coarse roots throughout; common very fine and fine interstitial pores; 1 percent medium masses of oxidized iron, dark yellowish brown (10YR 4/6) moist; very strongly acid (pH 4.8); clear wavy boundary
Bs--53 to 103 cm; coarse sandy loam, reddish yellow (7.5YR 6/6) dry, strong brown (7.5YR 4/6) moist; weak medium subangular blocky structure; slightly hard, friable, nonsticky and nonplastic; common very fine and fine roots; common very fine and fine interstitial pores; 15 percent coarse masses of oxidized iron, strong brown (7.5YR 5/6) moist, and 25 percent medium masses of reduced iron, dark gray (10YR 4/1) moist; 8 percent gravel; moderately acid (pH 5.9); abrupt smooth boundary
2R--103 cm; bedrock
TYPE LOCATION: Glacier Bay National Park and Preserve-Gustavus Area, Alaska; Hoonah-Angoon Census Area; latitude 58.2452325, longitude -136.5805850, datum WGS84 (coordinates determined by a GPS unit)
RANGE IN CHARACTERISTICS:
Mean annual soil temperature--1 to 7 degrees C
Depth to lithic contact--100 to 150 cm (deep)
Soil moisture control section--dry less than 45 consecutive days in June through October (udic)
Depth to redoximorphic iron concentrations and depletions--50 to 100 cm
Particle-size control section
*Clay content--5 to 14 percent
*Total rock fragment content--0 to 10 percent
Oe
Thickness--2 to 10 cm
A horizon
Value--2 or 3 moist, 3 or 4 dry
Chroma--1 or 2 moist or dry
Clay content--5 to 8 percent
Reaction (pH)--4.2 to 4.5
Thickness--8 to 15 cm
E horizon
Hue--10YR, 2.5Y
Value--6 to 8 moist or dry
Chroma--1 to 3 moist or dry
Clay content--5 to 8 percent
Reaction (pH)--4.2 to 4.5
Thickness--1 to 3 cm
Bs/Bhs horizon
Hue--5YR, 7.5YR
Value--2.5 to 4 moist, 3 to 6 dry
Chroma--3 to 6 moist or dry
Clay content--5 to 10 percent
Reaction (pH)--4.3 to 4.9
Thickness--9 to 35 cm
Bs horizon
Hue--5YR, 7.5YR
Value--3 or 4 moist, 4 to 6 dry
Chroma--3 to 6 moist or dry
Clay content--5 to 14 percent
Rock fragment content--0 to 8 percent
Reaction (pH)--5.0 to 5.5
Thickness--40 to 55 cm
COMPETING SERIES:
Matsu--no lithic contact within a depth of more than 150 cm (very deep)
Pioneerpeak--no lithic contact within a depth of more than 150 cm (very deep); skeletal below particle-size control section
GEOGRAPHIC SETTING:
Elevation--5 to 130 m
Climate--cool, moist summers; mild, wet winters
Mean annual precipitation--1780 to 3350 mm
Mean annual air temperature--3 to 7 degrees C
Frost-free period--90 to 154 days
GEOGRAPHICALLY ASSOCIATED SOILS:
Annoksek--25 to 50 cm (shallow) to a lithic contact; on similar landforms
Fingers--25 to 50 cm (somewhat poorly drained) to aquic conditions; on adjacent dissected landforms
Kashoto--organic (muck); on similar landforms
DRAINAGE AND SATURATED HYDRAULIC CONDUCTIVITY:
Drainage class--moderately well drained
Depth to saturation in normal years--53 cm or more
Saturated hydraulic conductivity (Ksat)--high throughout
USE AND VEGETATION:
Use--subsistence, recreation, wildlife habitat
Potential natural vegetation--moss, Alaska cedar, fernleaf goldthread, bunchberry dogwood, Lapland cornel, dicranum moss, splendid feather moss, heartleaf twayblade, American skunkcabbage, rusty menziesia, sidebells wintergreen, Schreber's big red stem moss, Alaska blueberry
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
*Albic material--zone from 21 to 24 cm
*Albic horizon--zone from 21 to 24 cm
*Aquic conditions--zone from 53 to 103 cm
*Redoximorphic iron concentrations--zone from 24 to 103 cm
*Redoximorphic iron depletions that have chroma of 2 or less--zone from 53 to 103 cm
*Spodic horizon--zone from 24 to 103 cm
*Spodic material--zone from 24 to 103 cm
*Depth to lithological discontinuity (lithic contact)--103 cm
*Particle-size control section--zone from 33 to 103 cm
National Cooperative Soil Survey
U.S.A.