LOCATION ROCKY AK
Established Series
SAS/ABD/TJR
02/2022
ROCKY SERIES
Landscape--mountain valleys, outwash plains
Landform--outwash terraces, earth hummocks on convex slopes of patterned ground
Slope--0 to 5 percent
Parent material--volcanic ash over outwash
Mean annual precipitation--about 1000 mm
Mean annual air temperature--about 1 degrees C
Depth class--very deep
Drainage class-- well drained
Soil moisture regime--udic
Soil temperature regime--cryic
Soil moisture subclass--typic
TAXONOMIC CLASS: Medial over sandy or sandy-skeletal, amorphic over mixed Typic Haplocryands
TYPICAL PEDON: Rocky medial sandy loam on a nearly level, linear glaciated plain, on a slope of 1 percent at an elevation of 57 m (The soil was moist throughout the profile when described on August 4, 2013.)
Oi--0 to 9 cm; slightly decomposed plant material; many very fine and common fine to coarse roots; very strongly acid (pH 4.6); clear smooth boundary
A--9 to 50 cm; medial sandy loam, yellowish brown (10YR 5/4) dry, dark yellowish brown (10YR 3/4) moist; weak medium granular structure; soft, very friable, slightly sticky and nonplastic; common very fine to medium roots; 3 percent cobbles; strongly acid (pH 5.5); clear smooth boundary
Bw--50 to 90 cm; medial silt loam, yellow (10YR 7/6) dry, yellowish brown (10YR 5/6) moist; moderate medium subangular blocky structure; slightly hard, friable, nonsticky and nonplastic; common very fine and fine roots; 8 percent medium irregular masses of oxidized iron, yellowish red (5YR 5/6) moist, clear boundaries in matrix; 3 percent cobbles; slightly acid (pH 6.1); clear smooth boundary
2C--90 to 150 cm; extremely gravelly coarse sand, gray (10YR 5/1) dry, very dark gray (10YR 3/1) moist; single grain; loose, nonsticky and nonplastic; 60 percent gravel and 10 percent cobbles; slightly acid (pH 6.3)
TYPE LOCATION: Dillingham Census Area, Alaska, about 35 km west of the village of Togiak; latitude 59.0574408 degrees north, longitude 159.7413647 degrees west, datum WGS 84 (coordinates determined with a GPS)
RANGE IN CHARACTERISTICS:
Mean annual soil temperature--0 to 3 degrees C
Soil moisture control section--dry less than 45 consecutive days in June through October (udic moisture regime)
Layers influenced by volcanic ash
*Thickness--36 to 99 cm
*Phosphorous retention--70 to 100 percent
*Bulk density--0.45 to 0.9 g/cm3
*Ammonium oxalate Al plus 1/2 Fe--0.5 to 3.0 percent
*Volcanic glass content--5 to 50 percent
Sandy-skeletal part of particle-size control section
*Clay content--0 to 5 percent
*Sand content--75 to 100 percent
*Total rock fragment content--40 to 85 percent
Oi horizon
Thickness--2 to 14 cm
A horizon
Hue--2.5YR, 5YR, 7.5YR, 10YR
Value--2.5 to 4 moist, 4 to 6 dry
Chroma--2 to 4 moist
Fine-earth texture--medial sandy loam, medial silt loam
Clay content--3 to 12 percent
Reaction--5.0 to 6.5
Total rock fragment content--0 to 20 percent
Gravel content--0 to 20 percent
Cobble content--0 to 5 percent
Thickness--5 to 45 cm
Bulk density--0.6 to 0.9 g/cm3
Phosphorous retention--70 to 100 percent
Volcanic glass content--5 to 50 percent
Bw horizon
Value--3 to 5 moist, 5 to 7 dry
Chroma--3 to 6 moist
Clay content--3 to 14 percent
Reaction--5.5 to 6.7
Total rock fragment content--0 to 30 percent
Gravel content--0 to 30 percent
Cobble content--0 to 10 percent
Thickness--15 to 60 cm
Bulk density--0.7 to 1.0 g/cm3
Phosphorous retention--70 to 100 percent
Volcanic glass content--10 to 50 percent
Extractable aluminum by 1 N KCl--0 to 2 cmol(+)/kg Al3+
Ammonium oxalate Al plus 1/2 Fe--0.4 to 3.0 percent
2C horizon
Hue--10YR, 2.5Y
Value--2 or 3 moist, 4 or 5 dry
Chroma--1 or 2 moist
Fine earth texture--coarse sand, loamy coarse sand, loamy sand
Clay content--0 to 5 percent
Reaction--5.5 to 6.5
Total rock fragment content--40 to 85 percent
Gravel content--40 to 85 percent
Cobble content--0 to 20 percent
Thickness--more than 37 cm
COMPETING SERIES: None
GEOGRAPHIC SETTING:
Elevation--0 to 730 m
Climate--warm, moist summers; cold, moist winters
Mean annual precipitation--600 to 1700 mm
Mean annual air temperature--2.3 to 1.8 degrees C
Frost-free period--75 to 140 days
GEOGRAPHICALLY ASSOCIATED SOILS:
Metervik--spodic horizon; reduced matrix; aquic conditions; similar landform positions
DRAINAGE AND SATURATED HYDRAULIC CONDUCTIVITY:
Drainage class--well drained
Saturated hydraulic conductivity (Ksat)--moderately high or high in the A and Bw horizons, very high in the 2C horizon
USE AND VEGETATION:
Use--wildlife habitat, recreation, subsistence
Potential natural vegetation--dwarf birch, smallawned sedge, cup lichens, greygreen reindeer lichen, star reindeer lichen, black crowberry, flavocetraria cucullata, marsh Labrador tea, grayleaf willow, tealeaf willow, beauverd spirea, snow lichen, bog blueberry, lingonberry
DISTRIBUTION AND EXTENT: Ahklun Mountains, Alaska; MLRA 237; moderate extent
SOIL SURVEY REGIONAL OFFICE (SSRO) RESPONSIBLE: WASILLA, ALASKA
SERIES ESTABLISHED: Togiak National Wildlife Refuge, Dillingham Census Area, Alaska; 2019
REMARKS:
Diagnostic horizons and other features in this pedon
*Particle-size control section--zone from 9 to 109 cm
*Ochric epipedon
*Andic soil properties--zone from 9 to 90 cm
*Cambic horizon--Bw horizon
*Redoximorphic iron concentrations--Bw horizon
*Depth to lithologic discontinuity--90 cm
See laboratory pedon 13N00125 for Bw horizon that has andic soil properties and amorphic mineralogy.
National Cooperative Soil Survey
U.S.A.