LOCATION PARKALLEY IDTentative Series
TAXONOMIC CLASS: Loamy-skeletal, mixed, superactive Pachic Argicryolls
TYPICAL PEDON: Parkalley gravelly loam - on a slope of 9 percent in rangeland at an elevation of 1,963 meters. (When described on August 4, 1982 the soil was dry throughout. Colors are for dry soil unless otherwise noted.)
A1--0 to 10 cm; dark brown (10YR 3/3) gravelly loam, very dark grayish brown (10YR 3/2) moist; moderate fine subangular blocky structure parting to strong fine granular; slightly hard, friable, non sticky and slightly plastic; common very fine and fine, and few medium and coarse roots; common very fine tubular and irregular pores; 20 percent angular gravel; neutral (pH 7.2); clear smooth boundary.
A2--10 to 23 cm; dark brown (10YR 3/3) gravelly loam, very dark grayish brown (10YR 3/2) moist; moderate fine and medium subangular blocky structure; slightly hard, friable, slightly sticky and slightly plastic; common very fine and fine, and few medium and coarse roots; common very fine tubular pores; 25 percent angular gravel; neutral (pH 7.2); clear smooth boundary.
A3--23 to 48 cm; brown (10YR 4/3) gravelly loam, very dark grayish brown (10YR 3/2) moist, moderate medium and coarse subangular blocky structure; slightly hard, friable, slightly sticky and slightly plastic, common very fine and fine, and few medium and coarse roots; common very fine tubular pores; 30 percent angular gravel; neutral (pH 7.0); clear wavy boundary. (Combined thickness of the A horizons is 19 to 50 cm)
Bt--48 to 71 cm; brown (10YR 5/3) very flaggy clay loam, dark brown (10YR 3/3) moist; moderate fine and medium subangular blocky structure; hard, friable, sticky and plastic; few very fine, fine, medium and coarse roots; common very fine tubular pores; few thin clay films on faces of peds and in pores; 25 percent angular gravel and 30 percent flagstones; neutral (pH 7.0); clear wavy boundary. (20 to 80 cm thick)
BC--71 to 104 cm; pale brown (10YR 6/3) extremely flaggy loam, brown (10YR 5/3) moist; weak fine subangular blocky structure; slightly hard, friable, slightly sticky and plastic; few very fine, fine, medium, and coarse roots; few very fine tubular pores; 35 percent gravel and 35 percent flagstones; neutral (pH 7.0); clear wavy boundary. (0 to 35 cm thick)
C--104 to 157 cm; light gray (10YR 7/2) extremely flaggy loam, grayish brown (10YR 5/2) moist; massive; slightly hard, friable, slightly sticky and slightly plastic; few very fine, fine and medium roots; few very fine irregular pores; 25 percent angular gravel and 60 percent flagstones; neutral (pH 7.0).
TYPE LOCATION: Clark County, Idaho; about 9.5 kilometers west and 1.5 kilometers south of Kilgore, Idaho; about 305 meters west and 620 meters north of the southeast corner of section 8, T. 12 N., R. 38 E.; Kilgore USGS topographic quadrangle; lat. 44 degrees 22 minutes 50.1 seconds N. long. 111 degrees 59 minutes 47.3 seconds W. NAD 83.
RANGE IN CHARACTERISTICS:
Mean annual soil temperature: 2.2 to 7.2 degrees C.
Mean summer soil temperature: 10.0 to 15.0 degrees C.
Xeric soil moisture regime
Thickness of mollic epipedon: 40 to 75 cm
Depth to base of the argillic horizon: 70 to 100 cm
Particle-size control section:
Clay content averages: 18 to 32 percent
Rock fragment: 0 to 25 percent gravel, 0 to 40 percent channers and 25 to 55 percent flagstones, combined weighted average is greater than 35 percent
A horizons
Value: 3 or 4 dry, 2 or 3 moist
Chroma: 1 to 3 dry or moist
Reaction: moderately acid to neutral
Bt horizon
Value: 4 to 6 dry, 3 to 5 moist
Chroma: 2 to 4 dry or moist
Fine-earth textures: L or CL with 35 to 70 percent total fragments, 0 to 25 percent gravel 10 to 50 percent channers and 10 to 55 percent flagstones
Reaction: moderately acid to neutral
BC horizon
Hue: 7.5YR or 10YR moist
Value: 5 to 7 dry, 4 or 5 moist
Chroma: 2 to 4 dry 3 or 4 moist
Fine-earth texture: L, CL or SCL with 65 to 90 percent total rock fragments, 10 to 45 percent gravel and 30 to 60 percent flagstones
Reaction: moderately acid to neutral
C horizon
Value: 6 to 8 dry, 4 or 5 moist
Chroma: 1 to 4 dry or moist
Fine-earth texture: L, SCL or SL with 25 to 35 percent gravel and 40 to 70 percent flagstones
Reaction: moderately acid to neutral
COMPETING SERIES: These are the Angelwhine, Aspetill, Badwater, Bickmore, Bluebell, Booneville, Buena Vista, Dab, Dailybasin, Delhew, Hawkinspeak, Keman, Littlemud, Lostcannon, Monibasin, Panin, Parkay, Rangertaft, Redbird, Rugherford, Sweetmount and Woodhurst series. Angelwhine, Aspetill, Lostcannon, Monibasin and Sweetmount soils have a base of the argillic horizon at 100 cm or more. Badwater soils have boulders in the particle size control section. Bickmore, Bluebell, Buena Vista, Hawkinspeak, Littlemud, Panin, Rangertaft, Rutherford and Woodhurst soils are moderately deep to bedrock. Booneville soils have an O horizon and the base of the argillic is deeper than 100 cm. Dab, Dailybasin, Delhew and Parkay soils do not have channers and flagstone rock fragments in the particle size control section. Keman soils have a mollic epipedon greater than 76 cm thick. Redbird soils have secondary accumulations of calcium carbonate.
GEOGRAPHIC SETTING:
Landscape: mountains
Landform: mountain slopes and hills
Elevation: 1,814 to 2,286 meters
Slope: 2 to 60 percent
Parent material: loess influenced colluvium and residuum from rhyolitic tuff
Mean annual air temperature: 2.8 to 6.1 degrees C.
Mean annual precipitation: 400 to 660 mm
Frost free period: 30 to 60 days
GEOGRAPHICALLY ASSOCIATED SOILS: These are the Ezbin, Hagenbarth, Latigo, and Zeebar series. The Ezbin, Latigo, and Zeebar soils are not Pachic. Ezbin soils have O horizons under Douglas-fir on mountain slopes. Hagenbarth soils have less than 35 percent rock fragments in the control section and are on mountain slopes and hills. Latigo soils have a calcic horizon and are on nearly level to steep rhyolite mountain slopes and hills. Zeebar soils are on hills and steeper mountain slopes.
DRAINAGE AND SATURATED HYDRAULIC CONDUCTIVITY:
Drainage class: Well
Runnoff: medium to high
Saturated hydraulic conductivity: moderately low
USE AND VEGETATION:
Major uses: livestock grazing and wildlife habitat
Dominant native vegetation: mountain big sagebrush, Idaho fescue, lupine, bluebunch wheatgrass, mountain snowberry, serviceberry and snowbrush ceanothus.
DISTRIBUTION AND EXTENT: Parkalley soils are of small extent in southeast Idaho.
MLRA SOIL SURVEY REGIONAL OFFICE (MO) RESPONSIBLE: Portland, Oregon.
SERIES PROPOSED: Clark County, Idaho, 1984.
REMARKS:
Diagnostic properties and soil characteristics recognized in this pedon are:
Mollic epipedon: from a depth of 0 to 71 cm
Argillic horizon: from a depth of 48 to 71 cm
Particle size control section: from a depth of 48 to 71 cm
Soil temperature regime: cryic
Soil moisture regime: xeric