LOCATION PRILL OR
Established Series
TMP/RWL
02/2025
PRILL SERIES
Landscape--mountains, foothills
Landform--hillslopes, benches
Slope--0 to 60 percent
Parent Material--colluvium and residuum over volcanic tuff with an influence mixed loess and ash in the surface
Mean annual precipitation--about 360 mm
Mean annual air temperature--about 9 degrees C
Depth class--moderately deep
Drainage class--well drained
Soil moisture regime--xeric
Soil temperature regime--mesic
Soil moisture subclass--typic
TAXONOMIC CLASS: Fine, smectitic, mesic Pachic Palexerolls
TYPICAL PEDON: Prill gravelly silty clay loam--rangeland; on a 20 percent slope at an elevation of 1067 m.
A--0 to 15 cm; black (10YR 2/1) gravelly silty clay loam, very dark gray (10YR 3/1) dry; moderate fine and medium subangular blocky structure; hard, firm, moderately sticky and moderately plastic; many very fine, fine and few medium roots; many very fine, fine and few medium tubular pores; 15 percent gravel; neutral (pH 7.0); abrupt smooth boundary
2Bt1--15 to 36 cm; very dark grayish brown (10YR 3/2) gravelly clay, dark grayish brown (10YR 4/2) dry; moderate coarse prismatic structure parting to strong medium and coarse subangular blocky; very hard, very firm, very sticky and very plastic; common very fine, fine and few medium roots; common very fine, fine and few medium tubular pores; many prominent clay films on faces of peds and lining pores; 20 percent gravel; neutral (pH 7.0); clear smooth boundary
2Bt2--36 to 51 cm; dark brown (10YR 3/3) gravelly clay, brown (10YR 4/3) dry, strong medium and coarse subangular blocky structure; very hard, very firm, very sticky and very plastic; few very fine and fine roots; few very fine and fine tubular pores; many prominent clay films on faces of peds and lining pores; 25 percent gravel; neutral (pH 6.8); clear smooth boundary
2Bt3--51 to 71 cm; brown (10YR 4/3) gravelly clay, brown (10YR 5/3) dry; strong medium and coarse subangular blocky structure; very hard, very firm, very sticky and very plastic; few very fine and fine roots; few very fine and fine tubular pores; many prominent clay films on faces of peds and lining pores; 30 percent gravel; neutral (pH 6.6); gradual wavy boundary
3Bt4--71 to 89 cm; brown (10YR 4/3) extremely cobbly silty clay, pale brown (10YR 6/3) dry; moderate fine and medium subangular blocky structure; hard, firm, moderately sticky and moderately plastic; few very fine and fine roots; few very fine and fine tubular pores; common distinct clay films on faces of peds and lining pores; 70 percent cobbles and 5 percent gravel; slightly acid (pH 6.4) gradual wavy boundary
3Cr--89 cm; volcanic tuff
TYPE LOCATION: Warm Springs Indian Reservation, Wasco County, Oregon, about 762 m east and 610 m north of the SW corner of section 10, T.7 S., R.13 E.; latitude 44.9764481, longitude -121.1644579, WGS84 datum (coordinates estimated from PLSS details)
RANGE IN CHARACTERISTICS:
Mean annual soil temperature--6 to 10 degrees C
Soil Moisture-- usually moist, but are dry in all parts of the moisture control section for 60 to 90 consecutive days within the four months that follow the summer solstice
Thickness of mollic epipedon--50 to 75 cm
Reaction--pH 6.1 to 8.4 (slightly acid to moderately alkaline)
Depth to lithic contact--50 to 100 cm
Estimated properties of layers influenced by volcanic ash
*Ammonium oxalate extractable Al + Fe--0.4 to 1.0 percent
*0.02 to 2.0 mm fraction--greater than 30 percent
*Volcanic glass in the 0.02 to 2.0 mm fraction--10 to 30 percent
Particle Size Control Section:
Clay--35 to 60 percent
Total rock fragments--5 to 30 percent
Gravel--5 to 30 percent
Cobble--0 to 30 percent
A horizon
*Hue--10YR or 7.5YR
*Value--2 or 3 moist, 3 or 4 dry
*Chroma--1 or 2
*Fine earth texture--clay loam, silty clay loam, loam
*Clay--15 to 35 percent
*Total fragments
*Sand--10 to 45 percent
*Gravel--0 to 25 percent
*Cobble--0 to 5 percent
*Organic matter--2 to 4 percent
*Reaction--pH 6.6 to 7.3 (neutral)
*Thickness--12 to 40 cm
2Bt horizons
*Hue--10YR or 7.5YR
*Value--3 or 4 moist, 4 or 5 dry
*Chroma--2 to 4
*Fine earth texture--clay, silty clay, silty clay loam, clay loam
*Clay-- 35 to 60 percent
*Sand-- 15 to 40 percent
*Gravel--5 to 30 percent
*Cobble--0 to 5 percent
*Organic matter--1 to 3 percent
*Reaction--pH 6.6 to 7.8 (neutral to slightly alkaline)
*Thickness--15 to 25 cm
3Bt horizons
*Hue--10YR or 7.5YR
*Value--3 or 4 moist, 5 or 6 dry
*Chroma--2 to 4
*Fine earth texture--clay, silty clay, clay loam
*Clay-- 35 to 60 percent
*Sand-- 15 to 35 percent
*Gravel--0 to 15 percent
*Cobble--15 to 70 percent
*Organic matter--0.5 to 2 percent
*Reaction--pH 6.1 to 7.8 (slightly acid to slightly alkaline)
*Thickness--10 to 30 cm
COMPETING SERIES:
Ridley--100 to 150 cm deep to bedrock
Mitchtown--moderately deep to a lithic contact; contain secondary carbonates at depths of 50 to 65 cm
GEOGRAPHIC SETTING:
Elevation--650 to 1400 m
Slope--1 to 60 percent
Climate--cool wet winters, hot dry summers
Mean annual precipitation--300 to 360 mm
Mean annual air temperature--7 to 11 degrees C
Frost-free period--90 to 140 days
GEOGRAPHICALLY ASSOCIATED SOILS:
Fawnspring--occur on adjacent forested side slopes; deep to sedimentary rock
Kaskela--occur on gently sloping benches and side slopes of foothills; very fine, smectitic mineralogy, deep to sedimentary rock
Littlefawn--occur on adjacent forested north-facing side slopes, a thin mantle of ash on the surface
DRAINAGE AND PERMEABILITY:
Drainage--well drained
Flooding--none
Ponding--none
Saturated hydraulic conductivity (Ksat)--moderately high in upper horizons, low to moderately low in lower horizons
USE AND VEGETATION:
Use--livestock grazing, wildlife habitat
Vegetation--antelope bitterbrush, bluebunch wheatgrass, Idaho fescue, Oregon white oak
Typical Ecological Site--JD Clayey 12-16 PZ (R010XB027OR)
DISTRIBUTION AND EXTENT:
North central Oregon; MLRA 10; small extent
SOIL SURVEY REGIONAL OFFICE (SSRO) RESPONSIBLE: Bozeman, Montana
SERIES ESTABLISHED:
Wasco County (Warm Springs Indian Reservation), Oregon 1993
REMARKS:
Diagnostic horizons and features recognized in this pedon are:
*Mollic epipedon--surface to depth of 50 cm (A, 2Bt1 and 2Bt2 horizons)
*Argillic horizon--15 to 89 cm
*Pale feature--argillic horizon with a clayey particle-size class, abrupt upper boundary (2Bt1 horizon) with 20 percent absolute clay increase
*Particle-size control section - from 15 to 65 cm (2Bt1, 2Bt2 and upper 14 cm of 2Bt3 horizon)
1/2020--This official series description was updated according to SSR01 Technical Note 11--Content and Format of Official Series Descriptions (revised 12/2015). Most of the changes were in formatting; no major technical changes were made.
National Cooperative Soil Survey
U.S.A.