LOCATION BARTONHILL IDEstablished Series
TAXONOMIC CLASS: Loamy-skeletal, carbonatic, frigid Pachic Calcixerolls
TYPICAL PEDON: Bartonhill very gravelly fine sandy loam at 6,150 feet elevation. (Colors are for dry soil unless otherwise noted. When the series was described on August 4, 1986, the surface was slightly moist.)
A1--0 to 3 inches; grayish brown (10YR 5/2) very gravelly very fine sandy loam, very dark gray (10YR 3/1) moist; weak thin platy structure; slightly hard, friable, nonsticky and nonplastic; many very fine, fine, and medium and few coarse roots; common very fine irregular pores; 30 percent gravel, 10 percent cobbles; lime coatings, 1 to 3 mm thick, on undersides of coarse fragments; strongly effervescent; moderately alkaline (pH 8.4); clear smooth boundary.
A2--3 to 12 inches; gray (10YR 5/1) very gravelly very fine sandy loam, very dark gray (10YR 3/1) moist; weak fine subangular blocky structure; soft, friable, nonsticky and nonplastic; common very fine, fine, medium and coarse roots; common very fine irregular pores; 50 percent gravel and 5 percent cobbles; lime coatings, 1 to 3 mm thick, on undersides of coarse fragments; strongly effervescent (55 percent calcium carbonate equivalent); moderately alkaline (pH 8.2); abrupt smooth boundary. (Combined thickness of the A horizons is 10 to 14 inches thick)
Bw--12 to 22 inches; dark grayish brown (10YR 4/2) very fine sandy loam, very dark gray (10YR 3/1) moist; weak fine subangular blocky structure; slightly hard, friable, nonsticky and nonplastic; common very fine, fine, medium and coarse roots; common very fine irregular pores; 10 percent gravel; lime coatings, 1 to 3 mm thick, on undersides of coarse fragments; strongly effervescent (25 percent calcium carbonate equivalent); moderately alkaline (pH 8.2); clear wavy boundary. (8 to 12 inches thick)
2Bkq1--22 to 46 inches; very dark gray (10YR 3/1) extremely gravelly loamy coarse sand, black (10YR 2/1) moist; single grain; loose, nonsticky and nonplastic; common very fine and , fine and few medium and coarse roots; common very fine irregular pores; 55 percent gravel, 20 percent cobbles; lime and silica coatings, 1 to 3 mm thick, on undersides of coarse fragments; violently effervescent (60 percent calcium carbonate equivalent); moderately alkaline (pH 8.2); clear wavy boundary.
2Bkq2--46 to 56 inches; very dark grayish brown (10YR 3/2) loamy fine sand, black (10YR 2/1) moist; single grain; loose, nonsticky and nonplastic; few very fine and fine, and common medium and coarse roots; common very fine irregular pores; 10 percent gravel; lime and silica coatings, 1 to 3 mm thick, on undersides of coarse fragments; violently effervescent; moderately alkaline (pH 8.4); clear wavy boundary.
2Bkq3--56 to 60 inches; very dark gray (10YR 3/1) extremely gravelly loamy sand, black (10YR 2/1) moist; single grain; loose, nonsticky and nonplastic; common very fine and fine roots; 50 percent gravel, 10 percent cobbles; common very fine irregular pores; lime and silica coatings, 1 to 3 mm thick, on undersides of coarse fragments; violently effervescent; moderately alkaline (pH 8.4).
TYPE LOCATION: Custer County, Idaho; about 3 miles north of Mackay, Idaho; about 800 feet south and 1,320 feet east from the northwest corner sec. 16, T.7N., R.23E. Latitude - 43 degrees, 56 minutes, 36 seconds N. Longitude - 113 degrees, 44 minutes, 22 seconds W.
RANGE IN CHARACTERISTICS:
The soil moisture control section is dry for one-half to three-fourths of the time when the soil temperature is above 41 degrees F. (aridic moisture regime).
Depth to sand and gravel - 20 to 26 inches
Mean annual soil temperature - 39 to 41 degrees F.
Mollic epipedon thickness - 20 to 26 inches
Particle-size control section:
clay content - 8 to 15 percent in the upper part and 3 to 8 in the lower part
rock fragment content weighted average - 35 to 60 percent
calcium carbonate equivalent - 40 to 55 percent average
A horizon:
Chroma - 2 or 3 dry and 1 through 3 moist
Rock fragment content - 35 to 55 percent
2Bkq horizons:
Value - 3 through 5 dry and 2 through 4 moist
Chroma - 1 through 3 dry or moist
Texture - stratified ranging from extremely gravelly loamy coarse sand to loamy fine sand
Rock fragment content - 0 to 90
COMPETING SERIES: This is the Wardbay series. Wardbay soils have a xeric soil moisture regime.
GEOGRAPHIC SETTING: Bartonhill soils are on outwash fans and draws. Slopes are 5 to 15 percent. These soils formed in mixed alluvium. The average annual precipitation is 8 to 13 inches. Elevations are 6,000 to 7,200 feet. The average annual temperature is 37 to 40 degrees F. The frost-free season is 50 to 60 days.
GEOGRAPHICALLY ASSOCIATED SOILS: This is the Simeroi and Whitecloud series. Simeroi soils lack a mollic epipedon and are in drainageways. Whitecloud soils are on fan terraces and lack a mollic epipedon and are somewhat poorly drained.
DRAINAGE AND PERMEABILITY: Well drained; moderately rapid over very rapid permeability.
USE AND VEGETATION: Rangeland and wildlife habitat. The vegetation is principally basin big sagebrush, and bluebunch wheatgrass.
DISTRIBUTION AND EXTENT: Southeast Idaho. The series is not extensive.
MLRA SOIL SURVEY REGIONAL OFFICE (MO) RESPONSIBLE: Portland, Oregon
SERIES ESTABLISHED: Custer County, Idaho, 1999.
REMARKS: Diagnostic horizons and features recognized in this pedon are:
Mollic epipedon - the zone from the surface to 22 inches
Calcic horizon - the zone from 22 to 60 inches (the 2Bkq1, 2Bkq2, and 2Bkq3 horizons)
Aridic soil moisture regime
Particle-size control section - the zone from 10 to 40 inches (part of the A2 and the Bw and part of the 2Bkq1 horizons)