LOCATION OLA ID+NV
Established Series
Rev. FRK-ALH-JVC-JBF
05/2016
OLA SERIES
The Ola series consists of moderately deep, well drained soils that formed in colluvium and residuum derived from intrusive igneous and metamorphic rocks. Ola soils are on pediments, hills, and mountains. Slopes are 6 to 80 percent. The mean annual precipitation is about 460 mm and the mean annual temperature is about 6 degrees C.
TAXONOMIC CLASS: Coarse-loamy, mixed, superactive, frigid Pachic Haploxerolls
TYPICAL PEDON: Ola loam--rangeland. (Colors are for dry soil unless otherwise noted.)
A1--0 to 18 cm; very dark grayish brown (10YR 3/2) loam, very dark brown (10YR 2/2) moist; weak thin platy structure parting to moderate very fine and fine granular; slightly hard, friable, slightly sticky and slightly plastic; many fine roots; many very fine pores; slightly acid (pH 6.4); abrupt smooth boundary. (5 to 25 cm thick)
A2--18 to 38 cm; very dark grayish brown (10YR 3/2) loam, very dark brown (10YR 2/2) moist; moderate medium and fine granular structure; slightly hard, friable, slightly sticky and slightly plastic; common fine roots; many very fine pores; faint skeletans; slightly acid (pH 6.4); clear wavy boundary. (13 to 25 cm thick)
A3--38 to 53 cm; very dark grayish brown (10YR 3/2) loam, very dark brown (10YR 2/2) moist; weak medium subangular blocky and moderate fine granular structure; slightly hard, friable, slightly sticky and slightly plastic; common fine roots; many very fine pores; faint skeletans; slightly acid (pH 6.4); clear wavy boundary. (8 to 20 cm thick)
C1--53 to 74 cm; dark grayish brown (10YR 4/2) coarse sandy loam, very dark brown (10YR 2/2) moist; weak fine and very fine granular structure; slightly hard, friable, slightly sticky and slightly plastic; common fine roots; many very fine pores; few faint clay films lining pores; few paragravel of weathered granite; slightly acid (pH 6.4); clear wavy boundary. (0 to 25 cm thick)
C2--74 to 89 cm; dark grayish brown (10YR 4/2) gravelly coarse sandy loam, very dark grayish brown (10YR 3/2) moist; massive; slightly hard, friable, slightly sticky and slightly plastic; common fine roots; many very fine pores; few thin to moderately thick dark brown (10YR 3/3) clay films lining pores and coating rock fragments; few paragravel of weathered granite; about 25 percent granite gravel; slightly acid (pH 6.3); clear wavy boundary. (10 to 30 cm thick)
R--89 cm; unweathered granite, upper 8 cm is partially weathered granite bedrock with many medium distinct olive brown (2.5Y 4/4) and common large prominent yellowish red (5YR 4/6) stains; few distinct clay films lining cracks in the bedrock; few roots in cracks; neutral (pH 6.6).
TYPE LOCATION: Gem County, Idaho; about 3 miles northeast of Ola; 600 feet north and 240 feet west of the center of the NE1/4 of section 7, T.10 N., R. 2 E.; latitude 44 degrees 13 minutes 17 seconds N and longitude 116 degrees 15 minutes 31 seconds W; NAD 83.
RANGE IN CHARACTERISTICS:
Soil moisture: Usually moist, moist in winter and spring, dry in late summer and fall; xeric soil moisture regime.
Soil temperature: 6 to 8 degrees C.
Depth to bedrock: 50 to 100 cm to a paralithic (or lithic) contact.
Reaction: Slightly acid or neutral.
Other features: The mollic epipedon commonly extends to the bedrock contact.
Particle-size control section - Rock fragments: Lithology of fragments is intrusive igneous (plutonic) rocks such as granite and metamorphic rocks such as quartzite.
A horizons
Value: 3 through 5 dry, 2 or 3 moist.
Chroma: 1 through 3 dry or moist.
ABt, CBt, or C horizons
Value: 5 through 8 dry, 2 through 6 moist.
Chroma: 2 or 3, dry or moist.
Texture: Loam, sandy loam, coarse sandy loam, gravelly coarse sandy loam, or gravelly sandy loam.
Other features: Illuvial clay is present, but the required clay increase is not met for these horizons to qualify as argillic horizons.
COMPETING SERIES: These are the
Cinderspring,
Iver,
Kabear,
Lobert,
Prucree,
Redmount,
Shively,
Suryon,
Taterpa, and
Wagore series.
Cinderspring,
Iver,
Kabear,
Lobert,
Redmount,
Suryon, and
Wagore soils are very deep.
Prucree soils have mean annual soil temperature of 4 to 6 degrees C.
Shively and
Taterpa soils are 100 to 150 cm to bedrock.
GEOGRAPHIC SETTING: Ola soils are on pediments, hills, and mountains. They formed in residuum and colluvium derived from intrusive igneous rocks and metamorphic rocks. Slopes are 6 to 80 percent. Elevations range from 900 to 2,000 meters in Idaho. Elevations are as high as 2,300 meters on south-facing slopes in northern Nevada. The mean annual precipitation is 360 to 600 mm, the mean annual temperature is 4 to 7 degrees C, and the frost-free period is 65 to 100 days.
GEOGRAPHICALLY ASSOCIATED SOILS: These are the
Brownlee,
Lochsa,
Rainey, and
Yakus soils. Brownlee soils are fine-loamy, deep or very deep, have argillic horizons, and have a mesic temperature regime. Brownlee soils are on dissected terraces and fans. Lochsa soils are deeper than 100 cm to bedrock and are on mountains. Rainey soils are coarse-loamy, moderately deep, have thin mollic epipedons, a mesic temperature regime, and are on south-facing mountain slopes. Yakus soils are loamy, very shallow and shallow to lithic contacts, and are on south and west-facing canyon walls.
DRAINAGE AND SATURATED HYDRAULIC CONDUCTIVITY: Well drained; medium or high surface runoff; moderately high saturated hydraulic conductivity.
USE AND VEGETATION: Ola soils are used primarily for rangeland and wildlife habitat. Dominant natural vegetation is Idaho fescue, bluebunch wheatgrass, antelope bitterbrush, and mountain big sagebrush with widely scattered ponderosa pine.
DISTRIBUTION AND EXTENT: Southwestern and south-central Idaho and areas in northern Nevada. These soils are moderately extensive. MLRAs 10, 11, 23, and 25.
MLRA SOIL SURVEY REGIONAL OFFICE (MO) RESPONSIBLE: Davis, California.
SERIES ESTABLISHED: Gem County, Idaho, 1962.
REMARKS: Diagnostic horizons and features recognized in this pedon are:
Mollic epipedon - The zone from the soil surface to 89 cm (A1, A2, A3, ABt, and CBt horizons).
Lithic contact - The boundary at 89 cm to underlying weathered bedrock (R layer).
Particle-size control section - The zone from 25 to 89 cm (part of the A2 horizon and the A3, ABt, and C1 horizons).
National Cooperative Soil Survey
U.S.A.