LOCATION PAGGA AK
Established Series
SAS/MPS
02/2022
PAGGA SERIES
Landscape--ultramafic bedrock controlled hills
Landform--hillslopes and summits
Slope--20 to 45 percent
Parent material--colluvium derived from ultramafic rocks over ultramafic residuum
Mean annual precipitation--about 465 mm
Mean annual air temperature--about -3 degrees C
Depth class--very deep
Drainage class--well drained
Soil moisture regime--udic
Soil temperature regime--cryic
Soil moisture subclass--typic
TAXONOMIC CLASS: Sandy-skeletal, mixed Typic Haplocryepts
TYPICAL PEDON: Pagga gravelly very fine sandy loam on a west northwest facing linear, convex shoulder on a slope of 20 percent at an elevation of 217 m (The soil was moist throughout the profile when described on July 17, 2019.)
Oe--0 to 7 cm; moderately decomposed plant material, dark grayish brown (10YR 4/2) dry, very dark brown (10YR 2/2) moist; nonsticky, nonplastic; many very fine, fine, and coarse and common medium roots throughout; very strongly acid (pH 5.0) clear smooth boundary
E--7 to 10 cm; gravelly very fine sandy loam, gray (10YR 6/1) dry, dark gray (10YR 4/1) moist; weak very fine granular structure; very friable, nonsticky, nonplastic; many very fine, fine, and coarse and common medium roots throughout; 15 percent angular gravel; very strongly acid (pH 5.0); abrupt smooth boundary
Bw1--10 to 18 cm; gravelly fine sandy loam, brown (10YR 5/3) dry, dark brown (10YR 3/3) moist; weak medium subangular blocky structure; friable, nonsticky, nonplastic; common very fine and few fine roots throughout; very fine tubular pores; 15 percent angular gravel; moderately acid (pH 6.0); abrupt smooth boundary
Bw2--18 to 35 cm; gravelly sandy loam, 60 percent brown (7.5YR 5/4) and 40 percent yellowish brown (10YR 5/4) dry, 60 percent dark brown (7.5YR 3/4) and 40 percent dark yellowish brown (10YR 3/4) moist; weak fine subangular blocky structure; very friable, nonsticky, nonplastic; few very fine roots throughout; very fine tubular pores; 25 percent angular gravel; slightly acid (pH 6.1); clear smooth boundary
C1--35 to 93 cm; very gravelly loamy sand, brown (10YR 5/3) dry, dark brown (10YR 3/3) moist; single grain; loose, nonsticky, nonplastic; 45 percent angular gravel; slightly alkaline (pH 7.4); abrupt irregular boundary
C2--93 to 155 cm; gravelly sandy loam, olive gray (5Y 5/2) dry, dark olive gray (5Y 3/2) moist; 10 percent fine irregular very dark gray (N 3/0) and 10 percent fine irregular strong brown(7.5YR 4/6) mottles; single grain; loose, nonsticky, nonplastic; 25 percent angular gravel; slightly alkaline (pH 7.4); clear smooth boundary
2R--155 to 200 cm; ultramafic bedrock
TYPE LOCATION: Yukon-Koyukuk Census Area, Alaska, latitude 63.0622115 longitude -160.6799338 degrees, datum WGS84 (coordinates determined with a GPS unit)
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 soil moisture regime)
Thickness of ochric epipedon--6 to 12 cm
Thickness of cambic horizon--25 to 90 cm
Depth to lithic bedrock--150 to 200 cm
Depth to lithologic discontinuity--150 to 200 cm
Particle Size Control Section:
*Clay--2 to 12 percent
*Total fragments--35 to 60 percent angular gravels derived from ultramafic rock
Oe horizon
Thickness--2 to 10 cm
E horizon
Value--4 to 6 moist, 6 or 8 dry
Chroma-1 or 2
Fine-earth texture--very fine sandy loam, sandy loam
Clay--2 to 10 percent
Sand-55 to 70 percent
Organic carbon--5 to 8 percent
Total rock fragment content--10 to 20 percent angular gravel derived from ultramafic rock
Reaction--4.8 to 5.5
Thickness--2 to 5 cm
Bw1 horizon
Chroma--3 to 6
Fine-earth texture--fine sandy loam, loamy sand
Clay--2 to 10 percent
Sand--60 to 85 percent
Organic carbon--2 to 5 percent
Total rock fragment content--15 to 60 percent angular gravel derived from ultramafic rock
Reaction--6.0 to 6.8
Thickness--5 to 15 cm
Bw2 horizon
Hue--10YR or 7.5YR
Value--3 to 5 moist, 5 to 7 dry
Chroma--3 or 4
Fine-earth texture--sandy loam, loamy sand
Clay--2 to 12 percent
Sand--60 to 85 percent
Organic carbon--1 to 4 percent
Total rock fragment content--25 to 65 percent angular gravel derived from ultramafic rock
Reaction--6.1 to 7.0
Thickness--15 to 35 cm
C1 horizon
Hue--10YR or 2.5Y
Chroma--2 or 3
Fine-earth texture--loamy sand, sand
Clay--0 to 8 percent
Sand--75 to 95 percent
Organic carbon--0.5 to 1 percent
Total rock fragment content--40 to 50 percent angular gravel derived from ultramafic rock
Reaction--6.9 to 7.4
Thickness--30 to 70 cm
C2 horizon
Hue--2.5Y or 5Y
Fine-earth texture--sandy loam, loamy sand, sand
Clay--0 to 10 percent
Sand--75 to 95 percent
Organic carbon--0.5 to 1 percent
Total rock fragment content--25 to 40 percent angular gravel derived from ultramafic rock
Reaction--7.1 to 7.4
Thickness--55 to 100 cm
2R horizon
COMPETING SERIES:
*
Southriver--moderately acid to neutral, no lithic contact present, coarse fragments are rounded, mixed river gravels; floodplains
*
Como--moderately acid to slightly acid; no lithic contact present; mountain slopes
*
Donnelly--moderately acid to slightly acid, no lithic contact present; somewhat excessively drained; outwash plains, stream terraces, escarpments, and moraines
*
Pippin--parent material is silty loess over glaciofluvial deposits, no lithic contact present, broad lacustrine terraces and till plains
*
Sinona--no lithic contact present; extremely acid to neutral; fan terraces on alluvial fans and stream terraces
GEOGRAPHIC SETTING:
*Elevation--100 to 450 m
*Climate--warm, moist summers; cold, dry winters
*Mean annual precipitation--465 mm
*Mean annual air temperature-- -5 to -1 degrees C
*Frost-free period--55 to 90 days
GEOGRAPHICALLY ASSOCIATED SOILS: none
DRAINAGE AND SATURATED HYDRAULIC CONDUCTIVITY:
*Drainage class--well drained
*Saturation during normal years--none
*Saturated hydraulic conductivity (Ksat)--very high in the surface organic layer, very high to high throughout the rest of the profile
USE AND VEGETATION:
Use--wildlife habitat, recreation, subsistence
Potential native vegetation--reindeer lichen, common juniper, alpine azalea, herbaceous forb, resin birch, white spruce, Siberian alder, beaverd spirea, black crowberry, bluejoint, stiff clubmoss, dicranum moss, Schreber's big red stem moss, groundcedar, white spruce, greygreen reindeer lichen, eightpetal mountain-avens, grayleaf willow, tealeaf willow, arctic stitchwort
DISTRIBUTION AND EXTENT: Yukon-Kuskokwim Highlands, Alaska; MLRA 230; small extent
SOIL SURVEY REGIONAL OFFICE (SSRO) RESPONSIBLE: WASILLA, ALASKA
SERIES ESTABLISHED: Nulato Hills BLM area, Yukon-Koyukuk Census Area, Alaska; 2021
REMARKS:
Diagnostic horizons and features recognized in this pedon
*Particle-size control section--zone from 32 to 107 cm
*Ochric epipedon--zone from 0 to 10 cm
*Albic horizon--zone from 7 to 10 cm
*Cambic horizon--zone from 10 to 35 cm'
*Depth to lithologic discontinuity--155 cm
*Lithic contact--at 155 cm
National Cooperative Soil Survey
U.S.A.