LOCATION ROANHIDE IDEstablished Series
The Roanhide series consists of moderately deep over bedrock, well
drained soils on hills and mountains. They formed in material from
intermediate intrusive rocks. Permeability is moderately rapid.
Slopes are 4 to 60 percent. The average annual precipitation is about
14 inches and the average annual air temperature is about 40 degrees F.
TAXONOMIC CLASS: Coarse-loamy, mixed, superactive, frigid Ultic Haploxerolls
TYPICAL PEDON: Roanhide coarse sandy loam - rangeland. (Colors are
for dry soil unless otherwise noted.)
A1--0 to 4 inches; grayish brown (10YR 5/2) coarse sandy loam, very
dark grayish brown (10YR 3/2) moist; moderate very fine and fine
granular structure; soft, very friable; many very fine and few medium
roots; many very fine interstitial pores; neutral (pH 6.8); clear
smooth boundary. (3 to 5 inches thick)
A2--4 to 9 inches; grayish brown (10YR 5/2) coarse sandy loam, very
dark grayish brown (10YR 3/2) moist; weak fine subangular blocky
structure; slightly hard, very friable; many very fine and fine roots;
many fine tubular pores; neutral (pH 7.2); clear smooth boundary. (4
to 6 inches thick)
Bw--9 to 15 inches; brown (10YR 5/3) coarse sandy loam, dark brown
(10YR 3/3) moist; moderate fine and medium subangular blocky structure;
slightly hard, very friable, slightly sticky; many fine and very fine
roots; many fine tubular pores; neutral (pH 7.2); clear smooth
boundary. (5 to 10 inches thick)
C1--15 to 22 inches; light brownish gray (10YR 6/2) coarse sandy
loam, dark grayish brown (10YR 4/2) moist; massive; slightly hard, very
friable; slightly sticky; few fine and very fine roots; few fine
tubular pores; neutral (pH 7.0); gradual wavy boundary. (6 to 16
inches thick)
Cr--22 to 24 inches; slightly weathered, fractured granitic
bedrock; few roots in cracks. (1 to 3 inches thick)
R--24 inches; bedrock.
TYPE LOCATION: Camas County, Idaho; about 7 miles north and one mile
and a quarter east of Hill City, Idaho; 2,000 feet east and 1,200 feet
south of the NW corner of section 27, T.1N., R.12E.
RANGE IN CHARACTERISTICS:
Average annual soil temperature - 41 to 45 degrees F
Depth to bedrock - 20 to 40 inches
Reaction - slightly acid or neutral throughout
Base saturation - 50 to 75 percent in some part above 30 inches
A horizon
Value- 4 or 5 dry, 2 or 3 moist
Chroma- 1 or 2
Bw horizon
Value- 4 through 7 dry, 3 through 5 moist
Chroma- 2 through 4
Texture - COSL, SL, GR-COSL, GR-SL
C horizon
Value- 6 or 7 dry, 3 or 4 moist
Chroma- 2 or 3
Texture - COSL, SL, GR-COSL, GR-SL, ST-COSL, ST-SL
COMPETING SERIES: These are the Baldmountain and Kilmerque series.
Kilmerque soils have an O horizon and lack hard bedrock above depth of
40 inches. Baldmountain soils are greater than 40 inches deep.
GEOGRAPHIC SETTING: Roanhide soils are on hills or mountains and have
slopes of 4 to 60 percent. They formed in material wathered from
granite, quartz monzonite, and other intrusive igneous rocks.
Elevations are 4,000 to 6,800 feet. Average annual precipitation is 12
to 20 inches. Average annual temperature ranges from 39 to 43 degrees
F. Frost-free period is 60 to 100 days.
GEOGRAPHICALLY ASSOCIATED SOILS: These are the Bauscher, Earcree, and
Lockman soils. Bauscher soils have a B2t horizon. Earcree and Lockman
soils have a summer temperature colder than 60 degrees F. Earcree and
Lockman soils are on north-facing slopes. Bauscher soils are on
toeslopes or north-facing slopes at lower elevations.
DRAINAGE AND PERMEABILITY: Well drained; medium to very rapid runoff;
moderately rapid permeability.
USE AND VEGETATION: Used for rangeland or pasture. Vegetation in the
potential natural plant community is bluebunch wheatgrass, Thurber
needlegrass, Sandberg bluegrass, mountain big sagebrush, Idaho fescue,
and bitterbrush.
DISTRIBUTION AND EXTENT: South-central Idaho. The series is
moderately extensive.
MLRA SOIL SURVEY REGIONAL OFFICE (MO) RESPONSIBLE: Portland, Oregon
SERIES ESTABLISHED: Camas County, Idaho, 1977.
REMARKS: Diagnostic horizons and features recognized in this pedon
are:
Mollic epipedon - the zone from 0 to 9 inches (A horizon).
Cambic horizon - the zone from 9 to 15 inches (Bw horizon).
Particle-size control section - the zone from 10 to 22 inches.
National Cooperative Soil Survey