LOCATION SANDUR OR
Tentative Series
IRD. RAW/RJO/DAL
03/2013
SANDUR SERIES
The Sandur series consists of very deep, very poorly drained soils formed in mixed alluvium on low terraces and floodplains of mountain valley floors and on mountain benches. Slopes are 0 to 5 percent. Mean annual precipitation is about 26 inches and mean annual temperature about 43 degrees F.
TAXONOMIC CLASS: Sandy-skeletal, mixed, frigid Aeric Endoaquents
TYPICAL PEDON: Sandur gravelly silt loam - wet meadow, on 0 percent slope at elevation of 4,700 feet. (Colors are for moist soil unless otherwise noted. Soil textures are apparent field textures.)
A--0 to 4 inches; very dark brown (7.5YR 2.5/2) gravelly silt loam, brown (7.5YR 4/2) dry; weak very fine subangular blocky structure; slightly hard, friable, nonsticky and nonplastic; many very fine and fine roots; few very fine irregular pores; 25 percent gravel, and 5 percent cobbles; slightly acid (pH 6.1); clear smooth boundary. (4 to 9 inches thick)
Cg1--4 to 8 inches; very dark brown (7.5YR 2.5/2) very cobbly loamy sand, brown (7.5YR 4/2) dry; many coarse prominent greenish gray (Gley2 5/10BG) redox depletions; massive; moderately hard, friable, nonsticky and nonplastic; common very fine and fine roots; common very fine irregular pores; 20 percent gravel, 15 percent cobbles, and 5 percent stones; slightly acid (pH 6.3); clear smooth boundary. (3 to 7 inches thick)
Cg2--8 to 31 inches; very dark brown (7.5YR 2.5/2) extremely cobbly loamy sand, brown (7.5YR 4/2) dry; common coarse prominent greenish gray (Gley2 5/10BG) redox depletions; single grain; slightly hard, loose, nonsticky and nonplastic; common very fine and few fine roots; common very fine irregular pores; 35 percent gravel, 20 percent cobbles, and 5 percent stones; slightly acid (pH 6.3); clear smooth boundary. (8 to 23 inches thick)
C--31 to 61 inches; dark brown (7.5YR 3/2) extremely cobbly loamy sand, brown (7.5YR 5/2) dry; single grain; slightly hard, loose, nonsticky and nonplastic; common very fine and few fine roots; common very fine irregular pores; 35 percent gravel, 25 percent cobbles, and 10 percent stones; slightly acid (pH 6.3).
TYPE LOCATION: Grant County, Oregon
Section 8 (SW , NW , SW ), T. 12 S., R. 32 E.
Latitude: 44 degrees 32 minutes 18 seconds north
Longitude: 118 degrees 53 minutes 49 seconds west
UTM Coordinates: Zone 11; 4,933,210 northing; 349,300 easting; NAD27
USGS Quadrangle: Magone Lake
RANGE IN CHARACTERISTICS:
Soil Temperature: frigid regime
Mean Annual Soil Temperature: 43 to 47 degrees F
Mean Summer Soil Temperature: 51 to 56 degrees F
Mean Winter Soil Temperature: 34 to 38 degrees F
Soil Moisture: aquic regime
Particle-size control section: 10 to 40 inches
Clay content, average: 1 to 5 percent
Rock fragment content, average: 60 to 80 percent
Diagnostic Horizons and Features:
depth to aquic conditions (gleyed layer): within 10 inches of the soil surface
A horizon:
color, moist: 7.5YR 2.5/1, 2.5/2, 2.5/3, 3/ 1, 3/2
color, dry: 7.5YR 4/2, 4/3, 5/2
texture: GR-SL, SIL, GR-SIL, SL
clay content: 3 to 8 percent
rock fragment content: total 0 to 30 percent
gravel: 0 to 25 percent
cobbles: 0 to 5 percent
reaction: slightly acid to neutral; pH: 6.1 to 7.3
organic carbon: 1.5 to 2.4 percent
Cg horizons:
color, moist: 7.5YR 2.5/2, 2.5/3, 3/2
color, dry: 7.5YR 4/2, 5/2, 5/3
texture: GRV-SL, CBV-LS, GRX-LS, CBX-LS
clay content: 1 to 8 percent
rock fragment content: total 35 to 70 percent
gravel: 20 to 70 percent
cobbles: 0 to 20 percent
stones: 0 to 5 percent
reaction: slightly acid to neutral; pH: 6.1 to 7.3
organic carbon: 0.2 to 0.6 percent
C horizon:
color, moist: 7.5YR 2.5/2, 3/2, 4/2
color, dry: 7.5YR 4/2, 5/2, 5/3, 6/2
texture: GRX-LS, CBX-LS, STX-LS, GRX-S
clay content: 1 to 5 percent
rock fragment content: total 60 to 85 percent
gravel: 30 to 50 percent
cobbles: 10 to 30 percent
stones: 0 to 30 percent
reaction: slightly acid to neutral; pH: 6.1 to 7.3
organic carbon: 0 to 0.2 percent
COMPETING SERIES: There are no competing series.
GEOGRAPHIC SETTING:
Landform: low terraces and floodplains of mountain valley floors and mountain benches
Slope gradient: 0 to 5 percent
Parent material: alluvium
Lithology: mixed rocks
Elevation: 3,600 to 4,800 feet
Climate: cold, wet winters and warm, dry summers
Mean annual precipitation: 17 to 34 inches
Mean annual air temperature: 41 to 44 degrees F
Frost-free period: 40 to 110 days
GEOGRAPHICALLY ASSOCIATED SOILS:
Bullroar: on well drained high terraces, with thick volcanic ash mantle, ashy over loamy-skeletal particle-size control section, and udic moisture regime under moist grand fir forest;
Dardry: on well drained high terraces and mountain valley toeslopes with loamy-skeletal particle-size control section, and under conifer forest with a xeric moisture regime;
Melloe: on poorly drained floodplains; with loamy-skeletal particle-size control section, aquic conditions within 10 to 18 inches, under wet meadow vegetation;
Mugwump: on moderately well drained planar to complex terraces with a mollic epipedon and loamy-skeletal particle-size control section, under fir and spruce forest with udic moisture regime;
Tamara: on well drained high terraces with thick volcanic ash mantle, argillic horizon, ashy over loamy particle-size control section, and udic moisture regime under moist grand fir forest;
Terlough: on somewhat poorly drained low terraces with a mollic epipedon, loamy-skeletal substratum and oxyaquic conditions within 16 inches, under fir and spruce forest with udic moisture regime;
DRAINAGE AND PERMEABILITY:
Drainage: very poorly drained
Permeability: moderately rapid in surface horizon and very rapid in substratum
USE AND VEGETATION:
Use: watershed, wildlife habitat and recreation
Native vegetation: mountain alder, stinking currant, common yarrow, common horsetail, large-leaf avens, tufted hairgrass, Holms Rocky Mountain sedge, woolly sedge and small-winged sedge
Plant Association: various mountain alder and sedge communities: CASC12 (Holms Rocky Mountain sedge), CALA30 (woolly sedge), EQAR (common horsetail), ALIN/EQAR (mountain alder/common horsetail), ALIN/CALA30 (mountain alder/woolly sedge)
DISTRIBUTION AND EXTENT:
Distribution: Blue Mountains of northeastern Oregon; MLRA 10
Extent: small
MLRA SOIL SURVEY REGIONAL OFFICE (MO) RESPONSIBLE: Portland, Oregon
SERIES PROPOSED: Malheur National Forest, Oregon 2007. Name is coined.
REMARKS: Diagnostic horizons and features recognized in this pedon are:
mollic subgroup feature: 0 to 31 inches
aeric subgroup feature: moist color having hue of 7.5YR, value of 4 and chroma of 2 from 8 to 31 inches
particle-size control section: 10 to 40 inches is sandy-skeletal
redoximorphic depletions: 4 to 31 inches
Fluvially washed, sand and rock fragments in lower substratum are assumed to be void of organic carbon needed for Fluvaquents criterion. Rapid streamflow has also removed volcanic glass from the fluvial materials.
National Cooperative Soil Survey
U.S.A.