LOCATION MAULE                   OR

Tentative Series
IRD. JRD/DAL
02/2013

MAULE SERIES

The Maule series consists of moderately deep, well drained soils on plateau tops and mountain sideslopes. They formed in volcanic ash and colluvium over residuum from rhyolitic tuff. Slopes are 5 to 70 percent. The mean annual precipitation is about 21 inches and the mean annual temperature is about 42 degrees F.

TAXONOMIC CLASS: Clayey-skeletal, smectitic, frigid Vitrandic Argixerolls

TYPICAL PEDON: Maule stony ashy sandy loam forestland, on a 17 percent southwest facing slope at 5,300 feet elevation. (Colors are for dry soil unless otherwise noted; apparent field textures.)

Oi--0 to 1 inch; slightly decomposed ponderosa pine needles and grasses

A--1 to 5 inches, brown (10YR 4/3) stony ashy sandy loam, very dark grayish brown (10YR 3/2) moist; moderate medium platy structure parting to moderate fine to medium subangular blocky; soft, friable, slightly sticky and slightly plastic; many very fine and fine roots; many very fine and fine irregular pores; 5 percent gravel, 5 percent cobbles and 5 percent stones; slightly acid (pH 6.4); clear smooth boundary.

AB--5 to 12 inches; brown (10YR 4/3) cobbly ashy clay loam, very dark grayish brown (10YR 3/2) moist; strong medium subangular blocky structure; slightly hard, firm, slightly sticky and moderately plastic; many very fine through medium roots, common coarse roots; many very fine to fine tubular and interstitial pores; 10 percent gravel, 10 percent cobbles and 5 percent stones; slightly acid (pH 6.4); clear wavy boundary. (Combined thickness of A and AB horizons is 7 to 13 inches)

2Bt1--12 to 21 inches; brown (10YR 4/3) very stony clay loam, very dark grayish brown (10YR 3/2) moist; strong fine to medium subangular blocky structure; slightly hard, firm, slightly sticky and moderately plastic; many very fine to coarse roots; many very fine to fine tubular and interstitial pores; common distinct clay films on ped faces; 10 percent gravel; 15 percent cobbles and 25 percent stones; slightly acid (pH 6.4); abrupt smooth boundary. (8 to 10 inches thick.)

2Bt2--21 to 32 inches; dark brown (10YR 3/3) cobbly clay, very dark brown (10YR 2/2) moist, strong medium prismatic structure; very hard, very firm, moderately sticky and moderately plastic; few very fine to coarse roots; few very fine interstitial pores; common distinct clay films on ped faces; 10 percent gravel and 15 percent cobbles; slightly acid (pH 6.4); gradual wavy boundary. (8 to 12 inches thick.)

2Cr--32 to 39 inches; moderately cemented welded tuff with some fingering of clay in bedrock fractures; gradual wavy boundary. (1 to 10 inches thick)

2R--39 inches; indurated welded tuff

TYPE LOCATION: Crook County, Oregon;
Section 9 (E 1/2 of NW 1/4) T. 18 S, R. 21 E.
Latitude: 44 degrees, 02 minutes, 06.8 seconds North
Longitude: 120 degrees, 14 minutes, 18.4 seconds West
UTM coordinates: zone 10; 4,879,276.9 northing; 721,283.6 easting; NAD27
USGS Quadrangle: Arrowwood Point

RANGE IN CHARACTERISTICS:
Soil temperature regime: frigid
Mean annual soil temperature: 40 to 45 degrees F
Mean summer soil temperature: 44 to 49 degrees F
Mean winter soil temperature: 32 to 36 degrees F
Soil Moisture: xeric regime, dry 60 to 90 consecutive days in summer and early fall

Particle size Control Section: upper 20 inches of the argillic horizon.
clay content (weighted average): 35 to 70 percent
rock fragment content (weighted average): 35 to 55 percent

Diagnostic horizons and features:
andic soil properties: upper boundary at the mineral surface; 7 to 13 inches thick
A1+1/2Fe(aox): 0.4 to 1.0 percent
P retention: 25 to 50 percent
0.02-2.0mm fraction: 60 to 80 percent of fine earth fraction
glass content in 0.02-2.0mm fraction: 30 to 50 percent
mollic epipedon: 20 to 40 inches thick
depth to argillic horizon: 7 to 13 inches
paralithic contact, depth below mineral surface: 23 to 35 inches
lithic contact, depth below mineral surface: 27 to 40 inches

A horizons
color, moist: hue 10YR; value 2 or 3; chroma 2 or 3
color dry: hue 10YR; value 3 or 4; chroma 2 or 3
texture: ST-ASHY-SL, CB-ASHY-SL, ASHY-SL, ASHY-SIL, ASHY-L
rock fragment content: 5 to 25 percent
gravel: 5 to 15 percent
cobbles: 5 to 10 percent
stones: 0 to 5 percent
reaction: moderately acid to slightly acid, pH: 5.6 to 6.4

2Bt horizons
color, moist: hue 10YR, 7.5YR, 5YR; value 2 to 4; chroma 2 to 4
color dry: hue 10YR, 7.5YR, 5YR; value 3 to 5; chroma 3 to 6
texture: STV-CL, STV-C, CB-C, CBV-C, CBV-CL
clay content: 35 to 70 percent
rock fragment content: 25 to 60 percent
gravel: 5 to 15 percent
cobbles: 10 to 15 percent
stones: 0 to 30 percent
reaction: moderately acid to neutral, pH: 5.6 to 6.6

COMPETING SERIES: These are the;
Breeseranch - deep, mollic epipedon 10 to 20 inches thick
Dupratt occurs over basalt and lacks the paralithic contact over the lithic contact
Erakatak lacks an O horizon, mollic epipedon 8 to 19 inches thick;
Finsel lacks an O horizon
Hamtah - very deep, lacks an O horizon
Home Camp lacks an O horizon, mollic epipedon less than 20 inches thick;
Humarel - mollic epipedon 10 to 18 inches thick
Lamulita - deep to a lithic contact, mollic epipedon 10 to 19 inches thick, dry 45 to 60 consecutive days in summer
Menbo lacks an O horizon, dry 100 to 120 consecutive days in summer
Shotsprings - dry 45 to 60 consecutive days in summer;
Squatterflat - very deep, mollic epipedon 10 to 16 inches thick, dry 60 to 75 days in summer

GEOGRAPHIC SETTING:
Landform: plateau tops, mountain sideslopes, benches, escarpments and small knolls
Slope gradient: 5 to 70 percent
Parent material: volcanic ash over colluvium and residuum
Lithology: pyoclastic rhyolitic tuffs
Elevation: 4,000 to 6,000 feet
Climate: cold, wet winters and hot, dry summers
Mean annual precipitation: 16 to 25 inches
Mean annual temperature: 40 to 45 degrees F.
Frost-free season: 60 to 90 days

GEOGRAPHICALLY ASSOCIATED SOILS:
Egyptcreek - on hillsides and escarpments; lacks an argillic horizon and is loamy-skeletal
Maufin - on mountain sideslopes; deep to paralithic contact
Combsflat - on basins, benches and swales; very deep with 14 to 20 inch ash mantle
Shotsprings - on mountain sideslopes and ridges; dry for 45 to 60 consecutive days under Douglas-fir, ponderosa pine and pinegrass
Maucros - on rolling sideslopes and plateau tops; deep with ash mantle 14 to 20 inches thick, under grand fir, ponderosa pine, heartleaf arnica, pinegrass and pine bluegrass
Wileyflat - on plateau tops and rolling hills; loamy skeletal argillic horizon under ponderosa pine, bitterbrush, Ross's sedge, western needlegrass and Wheelers bluegrass
Normauk - on relict landslides; very deep with 14 to 20 inch thick ash mantle under grand fir, Douglas-fir, ponderosa pine, pine grass and elk sedge
Maucav - on dissected plateaus and rolling hills; under western juniper, ponderosa pine, bitterbrush, mountain big sagebrush and squirreltail.

DRAINAGE AND PERMEABILITY:
Drainage: well drained
Runoff: medium
Permeability: moderately rapid in surface soil; slow in subsoil

USE AND VEGETATION:
Use: timber production, grazing, wildlife habitat and water supply
Natural vegetation: ponderosa pine, Idaho fescue, Ross's sedge, mountain brome and yarrow.

DISTRIBUTION AND EXTENT:
Distribution: MLRA 10; Central Oregon
Ecological region: Blue Mountains, John Day-Clarno Highlands
Extent: Moderate

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

SERIES PROPOSED: Crook County, Ochoco National Forest, Oregon, 2008.

REMARKS:
Diagnostic horizons and features recognized in this pedon are:
andic soil properties: 1 to 12 inches
mollic epipedon (pachic): 1 to 32 inches
argillic horizon: 12 to 32 inches
paralithic contact: 32 to 39 inches
lithic contact: 39 inches

Plant Association: CPS2-21, ponderosa pine, bitterbrush, Ross's sedge, (Hall, 1989, Plant Association and Management Guide for the Ochoco and Southern Blue Mountain Areas)
Plant Association Groups: dry and moist ponderosa pine

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National Cooperative Soil Survey
U.S.A.