LOCATION WILEYFLAT               OR

Tentative Series
IRD. JRD/DAL
02/2013

WILEYFLAT SERIES

The Wileyflat series consists of moderately deep, well drained soils formed in ash mixed with colluvium over residuum from pyroclastic tuffs. These soils are on plateau tops and ridges with slopes from 0 to 40 percent. The mean annual precipitation is about 17 inches and mean annual temperature about 42 degrees F.

TAXONOMIC CLASS: Loamy-skeletal, isotic, frigid Vitrandic Argixerolls

TYPICAL PEDON: Wileyflat channery ashy sandy loam - upland forest, on a 3 percent south slope. (Colors are for dry soils unless otherwise noted.)

Oi--0 to 2 inches, slightly decomposed pine duff and needles.

A--2 to 10 inches; dark brown (10YR 3/3) channery ashy sandy loam, very dark brown (10YR 2/2) moist; weak thin platy structure parting to moderate fine and medium subangular blocky; soft, friable, nonsticky and nonplastic; many very fine, fine and medium roots; many very fine and fine interstitial pores; 20 percent channers and 10 percent flagstones; strongly acid (pH 5.4); abrupt smooth boundary. (7 to 10 inches thick)

Bt1--10 to 19 inches; brown (10YR 5/3) very flaggy loam, dark brown (10YR 3/3) moist; moderate fine and medium subangular blocky structure; slightly hard, friable, slightly sticky and slightly plastic; many very fine, fine and medium roots; many very fine and fine tubular pores; common faint clay films bridging sand grains; 30 percent channers, 15 percent flagstones and 5 percent stones; moderately acid (pH 5.8); clear wavy boundary. (5 to 13 inches thick)

2Bt2--19 to 34 inches; brown (10YR 5/3) extremely stony silty clay loam, dark yellowish brown (10YR 3/4) moist; moderate fine and medium angular blocky structure; hard, firm, sticky and plastic; common fine and medium roots; many very fine and fine tubular pores; common faint clay films bridging sand grains and lining pores; 15 percent channers, 20 percent flagstones and 40 percent stones; moderately acid (pH 5.8); clear wavy boundary. (4 to 20 inches thick)

2R--34 inches; rhyolitic tuff

TYPE LOCATION: Harney County, Oregon; located on 4161 road south of Evaluation Plantation #EP-7; NW 1/4 of the NE1/4 of section 7, T. 20 S., R. 26 E.
Latitude: 43 degrees, 51 minutes, 29 seconds North
Longitude: 119 degrees, 38 minutes, 22 seconds West
UTM coordinates: zone 11; north 4859279.6 meters; east 287867.4 meters; NAD27

RANGE IN CHARACTERISTICS:
Soil Temperature: frigid regime
Mean Annual Soil Temperature: 40 to 45 degrees F
Mean Summer Soil Temperature: 49 to 54 degrees F
Mean Winter Soil Temperature: 30 to 34 degrees F
Soil Moisture: xeric regime, dry 75 to 90 consecutive days in summer

Particle-size Control Section: upper 20 inches of argillic horizon
clay content, average: 20 to 30 percent
rock fragment content, average: 55 to 85 percent, mostly flat channers and flagstones

Diagnostic Horizons and Features:
vitrandic subgroup properties: upper boundary at the mineral surface; 7 to 10 inches thick
Al+1/2Fe (ammonium oxalate): 0.4 to 1.0 percent
Phosphate retention: 25 to 40 percent
glass content in the 0.02-2.0mm fraction: 30 to 40 percent
mollic epipedon: 12 to 20 inches thick
argillic horizon, depth from mineral soil surface: 7 to 10 inches
lithic contact, depth from mineral soil surface: 20 to 40 inches

A horizon -
Value - 2 or 3 moist; 3, 4 or 5 dry
Chroma - 2 or 3 moist and dry.
Texture - CN-ASHY-SL, CN-ASHY-L
Clay content - 8 to 18 percent
Rock fragments - 15 to 35 percent
channers - 15 to 35 percent
flagstones - 5 to 10 percent

Bt1 horizon -
Value - 3 or 4 moist; 3, 4 or 5 dry
Chroma - 2 or 3 moist; 3 or 4 dry
Texture - FLV-L, CNX-L, CNV-L
Clay content - 18 to 27 percent
Rock fragments - 55 to 85 percent
channers - 25 to 60 percent,
flagstones - 10 to 25 percent
stones - 0 to 10 percent

2Bt2 horizon -
Value -3 or 4 moist; 5 or 6 dry
Chroma - 3 or 4 moist or dry
Texture - STX-SICL; STX-CL
Clay content - 27 to 35 percent
Rock fragments - 60 to 85 percent
channers - 5 to 20 percent
flagstones - 15 to 35 percent
stones - 35 to 65 percent

COMPETING SERIES:
Barneycreek (T): very deep in mixed colluvium from relict alluvial terraces; ash influenced surface horizons have glass content of 5 to 15 percent; rock fragments are rounded or subrounded; dry 60 to 75 consecutive days in summer
Getaway: deep to lithic contact (basalt); mollic epipedon 20 to 35 inches thick; ash influenced surface horizons have glass content of 5 to 20 percent; rock fragments are angular; dry 45 to 75 consecutive days in summer
Klicker: ash influenced surface horizons have glass content of 5 to 20 percent; dry 60 to 75 consecutive days in summer
Klickson: deep and very deep colluvium from basalt or andesite; ash influenced surface horizons have glass content of 5 to 20 percent; dry for 45 to 60 consecutive days following summer solstice
Larabee; ash influenced surface horizons have glass content of 5 to 20 percent; dry for 45 to 60 consecutive days in summer
Ryespur (T); very deep in colluvium from till; mollic epipedon 16 to 30 inches thick; ash influenced surface horizons have glass content of 15 to 30 percent; rock fragments are subrounded; dry 45 to 60 consecutive days in summer
Southworth (T); ash influenced surface horizons have glass content of 5 to 15 percent
Stemilt; deep and very deep colluvium from basalt and andesite; ash influenced surface horizons have glass content of 5 to 20 percent; rock fragments are subangular; dry for 60 to 75 consecutive days in summer
Sycreek: moderately deep and deep to densic horizon (till); ash influenced surface horizons have glass content of 5 to 20 percent; dry for 60 to 75 consecutive days in summer

GEOGRAPHIC SETTING: Wileyflat soils are on plateau tops and ridges. Elevation is 4000 to 6800 feet. Slopes are 0 to 40 percent. These soils formed in ash mixed with colluvium over residuum from pyroclastic tuffs. The climate is characterized by cold, wet winters and hot, dry summers. The mean annual precipitation is 14 to 20 inches. The mean annual temperature is 40 to 45 degrees F. The frost free period is 60 to 90 days.

GEOGRAPHICALLY ASSOCIATED SOILS: These are the Ateron, Egyptcreek, Forbord (T), Jushro (T), Maule (T) and Sintuf (T) soils. Ateron, Sintuf and Jushro soils are 10 to 20 inches to bedrock on plateau tops and shoulders of escarpments. Egyptcreek and Forbord soils are greater than 40 inches deep. Egyptcreek soils are on drainway sideslopes and hillslopes. Forbord soils are on the upland forest border with shrub steppe. Maule soils are clayey-skeletal in the control section and are on mountain sideslopes and hills.

DRAINAGE AND PERMEABILITY: Well drained and moderately slow permeability.

USE AND VEGETATION: Wileyflat soils are used mainly for timber, livestock grazing and wildlife habitat. Native vegetation is ponderosa pine, bitterbrush, elk sedge, western stipa and Wheelers bluegrass.
Blue Mountain Plant Association CPS2-22 (Ponderosa pine/bitterbrush-elk sedge), (Johnson and Clausnitzer, 1992, Plant Associations of the Blue and Ochoco Mountains.) These soils support dry and moist pine, plant association groups.

DISTRIBUTION AND EXTENT: Central Oregon, MLRA 10. This series is of moderate extent.

MLRA SOIL SURVEY REGIONAL OFFICE (MO) RESPONSIBLE: Portland, Oregon.

SERIES PROPOSED: Ochoco National Forest, Harney County, Oregon; part of the Crook County Area soil survey; 2008

REMARKS: Diagnostic horizons and features recognized in this pedon are:
mollic epipedon - 2 to 19 inches (A, Bt1 horizons)
argillic horizon - 10 to 34 inches (Bt1, Bt2 horizons)
vitrandic subgrjoup properties - 2 to 10 inches (A horizon)

ADDITIONAL DATA: Similar pedons sampled as Project 97Z - 11, (RZ97OR043) Ochoco NF, sample nos. 97Z-261S, 97Z-262S, 97Z-263S.

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National Cooperative Soil Survey
U.S.A.