LOCATION COALMINECREEK AK
Established Series
SAS/MPS
02/2022
COALMINECREEK SERIES
Landscape--valleys
Landform--floodplain
Slope--0 to 2 percent
Parent material--silty alluvium over loamy alluvium
Mean annual precipitation--about 340 mm
Mean annual air temperature--about -3 degrees C
Depth class--very deep
Drainage class--poorly drained
Soil moisture regime--udic
Soil temperature regime--cryic
Soil moisture subclass--typic
TAXONOMIC CLASS: Coarse-silty, mixed, superactive, nonacid Fluvaquentic Cryaquepts
TYPICAL PEDON: Coalminecreek silt on a linear, linear floodplain on a slope of 0 percent at an elevation of 10 m (The soil was wet, satiated, from 29 to 36 cm and moist throughout the rest of the profile when described on July 14, 2015.)
Oe--0 to 5 centimeters; moderately decomposed plant material, dark grayish brown (10YR 4/2) dry, very dark brown (10YR 2/2) moist; many very fine, few medium, and common fine roots; strongly acid (pH 5.5); clear smooth boundary
A1--5 to 10 centimeters; silt, dark gray (10YR 4/1) dry, black (10YR 2/1) moist; weak fine subangular blocky structure; friable, nonsticky, nonplastic; many very fine, few medium, and common fine roots; few fine irregular pores; strongly acid (pH 5.4); abrupt smooth boundary
A2--10 to 22 centimeters; stratified silt, 65 percent grayish brown (10YR 5/2) and 35 percent dark grayish brown (10YR 4/2) dry, 65 percent very dark grayish brown (10YR 3/2) and 35 percent very dark brown (10YR 2/2) moist; weak thick platy structure; friable, nonsticky, nonplastic; many very fine roots; few fine irregular pores; moderately acid (pH 5.7); clear smooth boundary
AC--22 to 70 centimeters; silt, grayish brown (10YR 5/2) dry, very dark grayish brown (10YR 3/2) moist; weak thick platy structure; friable, nonsticky, nonplastic; common very fine roots; few medium tubular pores; 1 percent fine prominent irregular noncemented black (10YR 2/1) manganese masses with sharp boundaries in matrix and 10 percent medium faint irregular noncemented dark grayish brown (10YR 4/2) masses of reduced iron with clear boundaries in matrix and 15 percent medium faint irregular noncemented brown (7.5YR 4/3) masses of oxidized iron with clear boundaries in matrix; moderately acid (pH 5.9); gradual smooth boundary
2C--70 to 115 centimeters; stratified very fine sandy loam, grayish brown (2.5Y 5/2) dry, very dark grayish brown (2.5Y 3/2) moist; massive; friable, nonsticky, nonplastic; 1 percent fine prominent irregular black (10YR 2/1) mottles in matrix and 5 percent medium faint lenticular dark yellowish brown (10YR 3/4) mottles with clear boundaries in matrix surrounding redox concentrations and 5 percent medium faint lenticular dark grayish brown (10YR 4/2) mottles with clear boundaries in matrix; moderately acid (pH 5.9); clear smooth boundary
3Cg--115 to 150 centimeters; stratified silt loam, gray (10YR 6/1) dry, dark gray (10YR 4/1) moist; massive; friable, nonsticky, nonplastic; 1 percent medium prominent lenticular noncemented black (10YR 2/1) manganese masses with clear boundaries in matrix and 1 percent coarse prominent irregular noncemented dark brown (7.5YR 3/4) masses of oxidized iron with clear boundaries in matrix; slightly acid (pH 6.2)
TYPE LOCATION: Nome Census Area, Alaska, latitude 63.8877670 longitude -160.6150840 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
Thickness umbric epipedon--25 to 65 cm
Depth to redoximorphic features--10 to 25 cm
Depth to aquic conditions--10 to 25 cm
Depth to reduced matrix--100 to 150 cm
Depth to mottles--45 to 70 cm below the mineral soil surface
Particle Size Control Section:
*Clay--6 to 12 percent
Oe horizon
Thickness--2 to 6 cm
A1 horizon
Value--2 to 3 moist, 4 or 5 dry
Chroma--1 or 2
Fine-earth texture--silt, silt loam
Clay--5 to 10 percent
Sand--2 to 15 percent
Organic carbon--4 to 7 percent
Reaction--5.0 to 6.3
Thickness--2 to 10 cm
A2 horizon
Value--2 to 3 moist, 4 or 5 dry
Chroma--2 or 3
Fine-earth texture--silt, silt loam
Clay--5 to 10 percent
Sand--5 to 20 percent
Organic carbon--3 to 5 percent
Reaction--5.7 to 6.2
Thickness--10 to 30 cm
AC horizon
Value--3 or 4 moist, 5 or 6 dry
Chroma--1 or 2
Clay--5 to 12 percent
Sand--5 to 12 percent
Organic carbon--1 to 2 percent
Reaction--5.7 to 6.5
Thickness-- 45 to 95 cm
2C horizon
Hue--10YR or 2.5Y
Value--3 or 4 moist, 5 or 6 dry
Chroma--1 or 2
Fine-earth texture--fine sandy loam, very fine sandy loam, silt loam
Clay--2 to 12 percent
Sand--25 to 70 percent
Organic carbon--0.5 to 1.5 percent
Reaction--5.7 to 6.3
Thickness--15 to 45
3Cg horizon
Hue--10YR or 5Y
Value--4 or 5 moist, 6 or 7 dry
Chroma--1 or 2
Fine-earth texture--silt, silt loam
Clay--5 to 12 percent
Sand--5 to 35 percent
Organic carbon--0.2 to 1.5 percent
Reaction--5.9 to 6.5
Thickness--20 to 35
COMPETING SERIES:
*
Oskawalikfamily--very poorly or poorly drained, buried A horizon, loess and alluvium, toeslopes of hills and floodplains
GEOGRAPHIC SETTING:
*Elevation--5 to 100 m
*Climate--warm, moist summers; cold, dry winters
*Mean annual precipitation--305 to 380 mm
*Mean annual air temperature-- -5 to -1 degrees C
*Frost-free period--55 to 90 days
GEOGRAPHICALLY ASSOCIATED SOILS:
*
Quekilok--aquic conditions at soil surface, histic epipedon; depressions on floodplains
*
Southriver--sandy skeletal substratum, moderately well to well drained; floodplains
DRAINAGE AND SATURATED HYDRAULIC CONDUCTIVITY:
*Drainage class--poorly drained
*Flooding--occasional, brief
*Saturation during normal years--from a depth of 0 to 25 cm to a depth of 50 to 100 cm for about 2 weeks during the growing season and from a depth of 100 to 150 cm through out much of the growing season
*Saturated hydraulic conductivity (Ksat)--very high in the surface organic layer, moderately high to high in the 2C horizon and moderately high throughout the rest of the profile
USE AND VEGETATION:
Use--wildlife habitat, recreation, subsistence
Potential native vegetation--Moss, Siberian alder, bluejoint, fireweed, field horsetail, splendid feather moss, white spruce, prickly rose, dwarf raspberry, feltleaf willow, littletree willow, Barclay's willow, northern bedstraw, red currant, grayleaf willow, Richardson's willow, tall bluebells, Lapland cornel, balsam poplar, squashberry, Tilesius' wormwood
DISTRIBUTION AND EXTENT: Nulato Hills-Southern Seward Peninsula Highlands, Alaska; MLRA 240; small extent
SOIL SURVEY REGIONAL OFFICE (SSRO) RESPONSIBLE: WASILLA, ALASKA
SERIES ESTABLISHED: Nulato Hills BLM area, Nome Census Area, Alaska; 2021
REMARKS:
Diagnostic horizons and features recognized in this pedon
*Particle-size control section--zone from 30 to 105 cm
*Umbric epipedon--zone from 5 to 70 cm
*Aquic conditions--zone from 22 to 70 and from 115 to 150 cm
*Redoximorphic depletions with chroma 2 or less--zone from 22 to 70 cm
*Redoximorphic concentrations--zone from 22 to 70 and from 115 to 150 cm
*Lithological discontinuity--zone from 70 to 115 cm and from 115 to 150 cm
*Reduced matrix--zone from 115 to 150 cm
National Cooperative Soil Survey
U.S.A.