LOCATION TANMAN                  OR

Tentative Series
KLM\MPR
02/2025

TANMAN SERIES

Landscape--plateaus
Landform--hillslopes, footslopes
Slope--5 to 80 percent
Parent material--colluvium and residuum derived from shale, conglomerates and sandstones
Mean annual precipitation--280 mm
Mean annual air temperature--9 degrees
Depth class--moderately deep
Drainage class--well drained
Soil moisture regime--aridic
Soil temperature regime--mesic
Soil moisture subclass--xeric

TAXONOMIC CLASS: Loamy-skeletal, mixed, superactive, mesic Calcic Pachic Argixerolls

TYPICAL PEDON: Tanman sandy clay loam - rangeland, on a 55 percent south slope at an elevation of 975 meters. (When described on July 16, 2013, the soil was slightly moist to 53cm. Colors are for moist colors unless otherwise stated.)

A--0 to 12 cm; dark brown (10YR 3/3) sandy clay loam, grayish brown (2.5Y 5/2) dry; weak fine granular structure; loose, loose, slightly sticky, slightly plastic; 2 percent flat shale channers and 10 percent sedimentary gravels; neutral (pH 7.0); clear smooth boundary.

Bt--12 to 35 cm; very dark grayish brown (10YR 3/2) very cobbly sandy clay loam, dark grayish brown (2.5Y 4/2) dry; moderate medium subangular blocky structure; friable, slightly hard, slightly sticky, slightly plastic; 13 percent faint clay films on all faces of peds; 16 percent sedimentary gravels and 35 percent sedimentary cobbles; neutral (pH 7.2); clear wavy boundary.

Btk1--35 to 53 cm; dark brown (10YR 3/3) very gravelly sandy clay loam, grayish brown (2.5Y 5/2) dry; weak fine subangular blocky structure; very friable, soft, slightly sticky, moderately plastic; 3 percent faint clay films on all faces of peds; 15 percent fine prominent irregular very pale brown (10YR 8/2) carbonate masses on faces of peds; 15 percent sedimentary cobbles and 30 percent sedimentary gravels; slightly alkaline (pH 7.5); clear smooth boundary.

Btk2--53 to 71 cm; dark brown (10YR 3/3) very gravelly sandy clay loam, light olive brown (2.5Y 5/3) dry; moderate fine subangular blocky structure; very friable, soft, slightly sticky, moderately plastic; 5 percent faint clay films on all faces of peds; 40 percent coarse prominent very pale brown (10YR 8/2) carbonate masses on bottom of rock fragments; 10 percent sedimentary cobbles and 30 percent sedimentary gravels; slightly alkaline (pH 7.6); clear wavy boundary.

R--71 to 100 cm; very strongly cemented shale

TYPE LOCATION: Wheeler County, Oregon; located about 6 km north of the town of Mitchell; 90 m east and 420 m north of the southwest corner of section 7, T. 11 S., R. 22 E.; Sutton Mountain 7.5' USGS Quad; latitude 44.6267910, longitude -120.142311, WGS84 Datum (coordinates determined from a GPS)

RANGE IN CHARACTERISTICS:
Mean annual soil temperature--8 to 12 degrees C
Soil moisture--Usually dry in all parts for one-half to three-fourths of the time when the soil temperature is above 5 degrees Celsius.
Depth to bedrock--50 to 100 cm
Mollic epipedon-- 50 to 75 cm thick
Reaction--neutral or slightly alkaline

Particle Size Control Section
*Clay content: 18 to 30 percent
*Total rock fragment content: 35 to 85 percent
*Rock fragment type--mixed sedimentary shales, sandstones and conglomerates

A horizon
*Hue--10YR moist, 10YR or 2.5Y dry
*Value--2 or 3 moist, 4 or 5 dry
*Chroma--1 to 3, moist or dry
*Fine earth texture--sandy loam, loam, sandy clay loam, clay loam
*Clay content: 15 to 30 percent
*Sand content--30 to 65 percent
*Organic matter content--1 to 4 percent
*Total rock fragments--0 to 65 percent
*Gravel content-- 5 to 60 percent
*Channer content--0 to 15 percent
*Thickness--8 to 20 cm

Bt horizons
*Hue--10YR moist, 10YR or 2.5Y dry
*Value--2 or 3 moist, 4 or 5 dry
*Chroma--2 to 4, moist or dry
*Fine earth texture--sandy clay loam, clay loam
*Clay content--20 to 35 percent
*Sand content--30 to 70 percent
*Organic matter content--0.5 to 2 percent
*Total rock fragments--35 to 75 percent
*Gravel content--20 to 75 percent
*Channer content--0 to 30 percent
*Cobble content--15 to 40 percent

COMPETING SERIES:
Matheny--greater than 100 cm to lithic contact
Yergenson-lack a lithic contact, greater than 150 cm to restrictive feature, xeric moisture regime
Vosset--greater than 150 cm to restrictive feature

GEOGRAPHIC SETTING:
Elevation--730 to 1280 m
Climate--cold, moist winters and hot, dry summers
Mean annual precipitation--230 to 300 mm
Mean annual air temperature--8 to 12 degrees C
Frost-free period--80 to 150 days
Lithology--shales of the Hudspeth formation and sandstones and conglomerates of the Gable Creek formation

GEOGRAPHICALLY ASSOCIATED SOILS:
Kelsidar--occur on side slopes and ridges; 25 to 50 cm bedrock; occur in complex with Tanman
Oldsferry--occur on side slopes and base slopes; 50 to 100 cm to bedrock; xeric soil moisture regime
Tub--occur on side slopes and base slopes; greater than 100cm to volcanic sediments
Sorf--occur on adjacent south slopes; average greater than 35 percent clay; 50 to 100cm to paralithic contact
Lickskillet--occur on side slopes and ridges; 25 to 50 cm to lithic contact (basalts and andesites)

DRAINAGE AND SATURATED HYDRAULIC CONDUCTIVITY:
Drainage--Well drained
Saturation during normal years--none
Flooding--none
Ponding--none
Saturated hydraulic conductivity (Ksat)--moderately high

USE AND VEGETATION:
Use--livestock grazing, wildlife habitat
Potential native vegetation--bluebunch wheatgrass, Sandberg bluegrass, sand dropseed, basin big sagebrush, antelope bitterbrush, broom snakeweed, and western juniper
Typical ecological site--JD Clayey South 9-12 PZ (R010XB041OR)

DISTRIBUTION AND EXTENT: Central Oregon, MLRA 10. These soils are not extensive.

SOIL SURVEY REGIONAL OFFICE (SSRO) RESPONSIBLE: Bozeman, Montana

SERIES PROPOSED: Wheeler County Area, Oregon, 2013

REMARKS:
Diagnostic horizons and features recognized in this pedon are:
Mollic epipedon--0 to 35 cm (A and Bt1 horizons)
Particle-size control section--12 to 62 cm (Bt1, Bt2, and Btk horizons)
Lithic contact--71 cm (very strongly cemented to indurated materials of the Hudspeth shales)
Secondary carbonates-35 to 71 cm (Btk1 and Btk2 horizons)

Most pedons have a surface that is littered with varying amounts of shale, sandstone, quartzite, gravels and cobbles derived from the Hudspeth and Gable Creek formations.

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National Cooperative Soil Survey
U.S.A.