LOCATION MARBLEPOINT OR
Established Series
IRD. RJO/JLW/DAL/KMS
02/2019
MARBLEPOINT SERIES
Landscape--mountains
Landform--mountain slopes
Slope--0 to 90 percent
Parent material--thin mantle of volcanic ash over till derived from mixed sources
Mean annual precipitation--about 1030 mm
Mean annual air temperature--about 2 degrees C
Depth class--very deep
Drainage class--well drained
Soil moisture regime--udic
Soil temperature regime--cryic
Soil moisture subclass--typic
TAXONOMIC CLASS: Loamy-skeletal, isotic Andic Haplocryepts
TYPICAL PEDON: Marblepoint stony ashy silt loam in an area of woodland, on a 45-percent, planar, southeast-facing slope at an elevation of 2185 m
Oi--0 to 5 cm; slightly decomposed needles and twigs
A--5 to 15 cm; stony ashy silt loam, brown (10YR 4/3) dry, very dark brown (10YR 2/2) moist; weak fine granular structure; soft, very friable, slightly sticky and slightly plastic; common fine and few medium and coarse roots; few fine irregular pores; 10 percent gravel, 10 percent cobbles, and 10 percent stones; very strongly acid (pH 4.7); clear wavy boundary
Bw--15 to 30 cm; very stony ashy silt loam, dark yellowish brown (10YR 4/4) dry, dark yellowish brown (10YR 3/4) moist; weak very fine subangular blocky structure; slightly hard, friable, slightly sticky and slightly plastic; common fine, medium, and coarse roots; few fine irregular pores; 20 percent gravel, 10 percent cobbles, and 15 percent stones; strongly acid (pH 5.5); gradual smooth boundary
2Bwb--30 to 66 cm; extremely stony loam, yellowish brown (10YR 5/4) dry, dark yellowish brown (10YR 3/4) moist; weak fine and medium subangular blocky structure; soft, friable, slightly sticky and slightly plastic; common fine, medium, and coarse roots; few fine irregular pores; 25 percent gravel, 20 percent cobbles, and 15 percent stones; slightly acid (pH 6.4); gradual smooth boundary
2BC--66 to 102 cm; extremely stony loam, pale brown (10YR 6/3) dry, dark yellowish brown (10YR 3/4) moist; weak fine and medium subangular blocky structure; slightly hard, friable, slightly sticky and slightly plastic; common fine and few medium and coarse roots; 25 percent gravel, 25 percent cobbles, and 20 percent stones; slightly acid (pH 6.5); gradual smooth boundary
2C--102 to 155 cm; extremely stony loam, pale brown (10YR 6/3) dry, dark yellowish brown (10YR 3/4) moist; massive; soft, friable, slightly sticky and slightly plastic; few fine and medium roots; 25 percent gravel, 25 percent cobbles, and 20 percent stones; slightly acid (pH 6.4)
TYPE LOCATION: Baker County, Oregon, about 385 m west and 510 m south of the northeast corner of section 7, T. 6 S., R. 44 E., latitude 45.0609661, longitude -117.3687215, datum WGS 84 (coordinates and PLSS details estimated from point on hard copy map)
RANGE IN CHARACTERISTICS:
Mean annual soil temperature--about 2 to 5 degrees C
Mean summer soil temperature--about 5 to 9 degrees C
Mean winter soil temperature--about -2 to 2 degrees C
Soil moisture--dry 30 to 45 consecutive days in summer
Thickness of ash-influenced layers--23 to 35 cm
Estimated properties of layers influenced by volcanic ash
*Ammonium oxalate extractable Al + 1/2 Fe--1.5 to 3.0 percent
*0.02- to 2.0-mm fraction--40 to 60 percent
*Glass content in 0.02- to 2.0-mm fraction--60 to 90 percent
*1/3-bar bulk density--0.65 to 1.00 g/cm3
*Phosphate retention--60 to 90 percent
*15-bar water retention--5 to 12 percent (dried samples)
*8 x Si plus 2 x Fe--5 to 12 percent
Particle-size control section
*Clay content--5 to 15 percent
*Total rock fragment content--60 to 70 percent
A horizon
Moist color--7.5YR 3/3, 10YR 2/2, 10YR 3/3, 10YR 3/4
Dry color--7.5YR 5/4, 10YR 4/3, 10YR 5/3, 10YR 5/6, 10YR 6/3
Fine-earth texture--ashy silt loam
Clay content--3 to 8 percent
Sand content--20 to 40 percent
Organic matter content--2 to 6 percent
Total rock fragment content--15 to 35 percent
Gravel content--0 to 15 percent
Cobble content--0 to 10 percent
Stone content--0 to 20 percent
Reaction--4.5 to 6.0
Thickness--8 to 13 cm
Bw horizon
Moist color--10YR 3/4, 10YR 4/4, 10YR 4/6, 10YR 5/4
Dry color--10YR 4/4, 10YR 6/4, 10YR 7/4
Fine-earth texture--ashy silt loam
Clay content--3 to 8 percent
Sand content--35 to 40 percent
Organic matter content--1 to 3 percent
Total rock fragment content--35 to 55 percent
Gravel content--5 to 20 percent
Cobble content--5 to 15 percent
Stone content--0 to 20 percent
Reaction--5.1 to 6.5
Thickness--15 to 25 cm
2Bwb horizon, or 2Ab or 2AEb horizon (where present)
Moist color--10YR 3/4, 10YR 5/2, 10YR 5/3, 10YR 5/6
Dry color--10YR 6/2, 10YR 6/3, 10YR 6/4, 10YR 6/6, 2.5Y 5/4
Fine-earth texture--sandy loam, loam, loamy sand, silt loam
Clay content--3 to 16 percent
Sand content--35 to 75 percent
Organic matter content--0.5 to 3.5 percent
Total rock fragment content--35 to 70 percent
Gravel content--20 to 50 percent
Cobble content--5 to 25 percent
Stone content--5 to 30 percent
Reaction--5.1 to 6.5
Thickness--13 to 36 cm
2BC and 2C horizons
Moist color--10YR 3/4, 2.5Y 3/2, 2.5Y 5/6
Dry color--10YR 6/3, 2.5Y 5/4
Fine-earth texture--sandy loam, loam, loamy sand
Clay content--3 to 18 percent
Sand content--40 to 80 percent
Organic matter content--0.3 to 2.0 percent
Total rock fragment content--65 to 75 percent
Gravel content--20 to 50 percent
Cobble content--10 to 25 percent
Stone content--10 to 30 percent
Reaction--5.1 to 6.5
Thickness of 2BC horizon--30 to 40 cm
COMPETING SERIES:
Bearpawmeadow--50 to 100 cm (moderately deep) to lithic contact (andesite, basalt)
Bordengulch--50 to 100 cm (moderately deep) to lithic contact (argillite, sandstone)
Monumentrock--100 to 150 cm (deep) to lithic contact (andesitic basalt, basalt)
Risingwolf--medial texture modifiers in upper part
Vandamine--formed in material derived from argillite or metavolcanic rock; rock fragments dominantly angular or subangular gravel
GEOGRAPHIC SETTING:
Elevation--1500 to 2600 m
Climate--cold, wet winters; cool, moist summers
Mean annual precipitation--about 760 to 1680 mm
Mean annual air temperature--about 0 to 4 degrees C
Frost-free period--15 to 65 days
GEOGRAPHICALLY ASSOCIATED SOILS:
Angelbasin--on glacially scoured mountain backslopes; 50 to 100 cm (moderately deep) to lithic contact (granite)
Bucketlake--on footslopes and glacial valley floors; mantle of volcanic ash more than 35 cm thick
Burgerbutte--on backslopes, shoulders, and ridges of glacially scoured mountains; 35 to 50 cm (shallow) to lithic contact (basalt)
Elkhorncrest--on glacially scoured trough walls and valley floors; 25 to 50 cm (shallow) to lithic contact (granite)
Moodybasin--on lateral moraines in glaciated mountain valleys; 50 to 100 cm (moderately deep) to densic contact
Mudlakebasin--on heavily forested glacial benches and valley floors; 50 to 100 cm (moderately deep) to lithic contact (granitic rock)
Pattenbutte--on moderately steep, south-facing slopes under an open forest canopy; 35 to 50 cm (shallow) to lithic contact (granite)
DRAINAGE AND SATURATED HYDRAULIC CONDUCTIVITY:
Saturation during normal years--none
Flooding--none
Ponding--none
Saturated hydraulic conductivity (Ksat)--moderately high, high
USE AND VEGETATION:
Use--timber production, watershed, recreation, wildlife habitat
Potential native vegetation--subalpine fir, Engelmann spruce, lodgepole pine, grand fir, Douglas-fir, western larch, grouse huckleberry, big huckleberry, heartleaf arnica, darkwoods violet, sidebells wintergreen, lupine, sweetcicely, Utah honeysuckle, prince's pine, pinegrass, Sitka valerian, sickletop lousewort, skunkleaf polemonium, western meadow-rue, elk sedge
DISTRIBUTION AND EXTENT: Blue Mountains of northeastern Oregon; MLRA 10; small extent
SOIL SURVEY REGIONAL OFFICE (SSRO) RESPONSIBLE: Portland, Oregon
SERIES ESTABLISHED: Wallowa-Whitman National Forest, Oregon; 2018
REMARKS:
Diagnostic horizons and other features recognized in this pedon
*Ochric epipedon
*Upper cambic horizon--zone from 15 to 30 cm
*Buried cambic horizon--zone from 30 to 66 cm
*Volcanic glass--zone from 5 to 30 cm
*Andic soil properties--zone from 5 to 30 cm
*Particle-size control section--zone from 30 to 107 cm
National Cooperative Soil Survey
U.S.A.