LOCATION PEAVINER                OR

Tentative Series
IRD. RAW/JLW/DAL
03/2013

PEAVINER SERIES

The Peaviner series consists of deep, well drained soils on mountain meadows and basins of mountain valley floors. Peaviner soils are formed in colluvium with an influence of volcanic ash overlying residuum of andesitic tuff and tuff breccia. Slopes are 0 to 15 percent. Mean annual precipitation is about 25 inches and mean annual temperature is about 40 degrees F.

TAXONOMIC CLASS: Fine, smectitic, frigid Vertic Palexerolls

TYPICAL PEDON: Peaviner gravelly ashy sandy clay loam - moist mountain meadows, on a 4 percent southfacing slope at an elevation of 5,927 feet. (Colors are for moist soil unless otherwise noted. Andic soil materials are apparent field textures.)

A--0 to 11 inches; dark brown (7.5YR 3/2) gravelly ashy sandy clay loam; brown (7.5YR 5/4) dry; moderate fine granular structure; slightly hard, friable, moderately sticky and moderately plastic; few very fine and coarse, and common fine and medium roots throughout; few fine irregular and few fine and very fine tubular pores; 15 percent gravel, 5 percent cobbles and 2 percent stones; slightly acid (pH 6.5); clear wavy boundary.

ABt--11 to 20 inches; dark brown (7.5YR 3/3) gravelly sandy clay loam; brown (7.5YR 5/3) dry; moderate fine subangular blocky structure; hard, firm, moderately sticky and moderately plastic; common faint clay films on ped faces; few very fine and medium, and common fine roots throughout; few fine irregular and tubular pores; 20 percent gravel and 10 percent cobbles; neutral (pH 6.7); abrupt wavy boundary. (Combined thickness of A and ABt is 16 to 26 inches)

Bt--20 to 38 inches; brown (7.5YR 5/4) cobbly clay; light brown (7.5YR 6/4) dry; strong medium angular blocky structure; very hard, very firm, very sticky and very plastic; many prominent clay films on ped faces; few very fine and fine roots throughout; few very fine irregular pores; 20 percent gravel and 14 percent cobbles; neutral (pH 7.0); clear smooth boundary. (7 to 28 inches thick)

BCt--38 to 49 inches; brown (7.5YR 5/4) cobbly clay; light brown (7.5YR 6/4) dry; moderate fine subangular blocky structure; very hard, very firm, very sticky and very plastic; common distinct clay films on ped faces; few very fine irregular pores; 20 percent gravel and 14 percent cobbles; neutral (pH 7.1); abrupt wavy boundary. (6 to 11 inches thick)

R--49 inches; hard tuff

TYPE LOCATION: Crook County, Oregon
Section 7 (NE 1/4, NW 1/4, NW 1/4), T. 13 S., R. 21 E.
UTM Zone 11: 4,927,148 northing: 717,962 easting
USGS Quadrangle: Ochoco Butte

RANGE IN CHARACTERISTICS:
Soil Temperature: frigid regime
Mean Annual Soil Temperature: 39 to 44 degrees F
Mean Summer Soil Temperature: 46 to 52 degrees F
Mean Winter Soil Temperature: 32 to 37 degrees F
Soil Moisture: xeric regime, dry 45 to 60 days in summer

Particle-size Control Section: upper 20 inches of argillic horizon
Clay content, average: 35 to 60 percent
Rock fragment content, average: 0 to 35 percent

Diagnostic Horizons and Features:
Vitrandic subgroup soil properties: upper boundary at the mineral surface; 7 to 14 inches thick
A1+1/2Fe(aox): 0.2 to 1.0 percent
bulk density: 1.3 to 1.5 g/cc
P retention: 20 to 40 percent
glass content in the 0.02-2.0mm fraction: 5 to 20 percent
water content at 1500 kPa (air dried): 10 to 30 percent
8Si + 2Fe (aox): less than 3 percent
mollic epipedon: 16 to 26 inches thick
depth to lithic contact: 40 to 60 inches

Major Horizons:
A horizon:
color, moist: 7.5YR 2.5/1, 3/2; 10YR 2/1, 3/2
color, dry: 7.5YR 2.5/2, 4/2, 5/3; 10YR 5/2, 5/3
texture: GR-ASHY-SCL, ASHY-L, ASHY-SCL
clay content: 18 to 30 percent
rock fragment content: 0 to 15 percent
gravel: 0 to 15 percent
cobbles: 0 to 5 percent
stones: 0 to 2 percent
reaction: slightly acid to neutral pH: 6.1 to 7.3

ABt horizon (AB horizon in some pedons):
color, moist: 7.5YR 2.5/1, 3/2, 3/3; 10YR 3/2, 3/3
color, dry: 7.5YR 2.5/2, 4/2, 5/3
texture: GR-SCL, GR-CL, CL
clay content: 27 to 40 percent
rock fragment content: 0 to 30 percent
gravel: 0 to 20 percent
cobbles: 0 to 10 percent
reaction: slightly acid to neutral pH: 6.1 to 7.3

Bt horizon:
color, moist: 7.5YR 4/2, 4/3, 5/4; 10YR 4/1, 4/3
color, dry: 7.5YR 4/2, 6/4; 10YR 4/1, 6/3
texture: C, GR-C, CB-C
clay content: 40 to 60 percent
rock fragment content: 0 to 35 percent
gravel: 0 to 20 percent
cobbles: 0 to 15 percent
reaction: slightly acid to neutral pH: 6.1 to 7.3

BCt horizon:
color, moist: 7.5YR 4/2, 5/4; 10YR 3/4, 4/2, 5/2, 5/3
color, dry: 7.5YR 5/3, 6/4; 10YR 5/2, 5/3, 6/4
texture: CB-SC, C, CB-SIC
clay content: 40 to 50 percent
rock fragment content: 0 to 35 percent
gravel: 0 to 20 percent
cobbles: 0 to 15 percent
reaction: slightly acid to neutral pH: 6.1 to 7.3

COMPETING SERIES:

Booth - moderately deep to paralithic weathered tuff; mollic epipedon 7 to 15 inches thick; no ash influence; dry for 80 to 110 days in summer (aridic);
Campcreek - very deep; dry 60 to 75 days in summer;
Carryback - moderately deep to lithic basalt; no ash influence; aridic soil moisture regime;
Crowcamp - very deep; no ash influence; duric Bkq horizon; dry 75 to 90 days in summer;
Golars - moderately deep to lithic basalt; vitrandic subgroup properties less than 7 inches thick; dry 60 to 90 days in summer;
Hankins - dry 60 to 90 days in summer;
Jesh - very deep; no ash influence;
Joenchris - very deep; mollic epipedon 10 to 16 inches thick; 15 to 25 percent gravel in upper part of argillic; dry 75 to 90 days in summer;
Kidnapspring - very deep;
Locrol - very deep; mollic epipedon 7 to 16 inches thick; no ash influence; episaturation at 7 to 16 inches from March to May;
Longbarn - mollic epipedon 7 to 14 inches thick; dry 75 to 90 days in summer;
Meaufun - deep to paralithic weathered tuff or basalt; mollic epipedon 7 to 16 inches thick; dry 60 to 75 days in summer;
Tippett - dry 60 to 90 days in summer;
Warpaint - very deep; mollic epipedon 10 to 15 inches thick; less than 15 percent gravel in upper part of argillic; aridic soil moisture regime;
Zumwalt - moderately deep to lithic basalt; dry 60 to 90 days in summer;

GEOGRAPHIC SETTING:
Landform: toe slopes of basins and mountain valley floors
Slope gradient: 0 to 15 percent
Parent material: colluvium mixed with volcanic ash overlying residuum
Lithology: Mazama ash over Clarno tuffs
Elevation: 4,400 to 6,000 feet
Climate: cold, wet winters; warm, dry summers
Mean annual precipitation: 24 to 27 inches
Mean annual air temperature: 37 to 42 degrees F.
Frost-free period: 30 to 75 days

GEOGRAPHICALLY ASSOCIATED SOILS:
Terrodd (T): on low terraces of mountain valley floors
Tolo: on nearly level upland dissected plateaus and mountain slopes

DRAINAGE AND PERMEABILITY:
Drainage: well drained
Permeability: moderately slow over slow

USE AND VEGETATION:
Use: meadows, range, wildlife, grazing, recreation, watershed.
Native vegetation: sticky cinquefoil, blueleaf strawberry, common yarrow, common timothy.
Plant association: Moist Meadow

DISTRIBUTION AND EXTENT:
MLRA 10
Distribution: Ochoco Mountains of central Oregon, Blue Mountains of northeastern Oregon
Extent: inextensive

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

SERIES PROPOSED: Crook County, Oregon 2007. The name is coined.

REMARKS: Diagnostic horizons and features recognized in this pedon are:
mollic epipedon: 0 to 20 inches; A, ABt
argillic horizon: 20 to 45 inches; Bt, BCt
particle-size control section: 20 to 40 inches; Bt, BCt
vitrandic subgroup feature: 0 to 11 inches; A

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National Cooperative Soil Survey
U.S.A.