LOCATION FANDOW IDEstablished Series
TAXONOMIC CLASS: Loamy-skeletal, carbonatic, shallow Xereptic Petrocryids
TYPICAL PEDON: Fandow gravelly loam--on a 5 percent east-facing slope at 6,650 feet elevation in rangeland. (Colors are for dry soil unless otherwise stated. When described on May 12, 1981, the soil was moist throughout.)
A--0 to 3 inches; pale brown (10YR 6/3) gravelly loam, brown (10YR 4/3) moist; weak fine granular structure; soft, very friable; nonsticky and nonplastic; many very fine and fine and few moderate and coarse roots; many very fine and fine interstitial pores; 20 percent pebbles; strongly effervescent (35 percent calcium carbonate); moderately alkaline (pH 8.0); abrupt smooth boundary. (2 to 6 inches thick)
Bk--3 to 9 inches; light yellowish brown (10YR 6/4) very gravelly loam, brown (10YR 5/3) moist; weak medium to fine subangular blocky structure parting to weak fine subangular blocky; slightly hard, friable; nonsticky and nonplastic; many very fine and fine and few medium and coarse roots; many very fine and fine interstitial pores; 40 percent pebbles; lime coatings less than 1 mm thick on undersides of coarse fragments; violently effervescent (60 percent calcium carbonate); moderately alkaline (pH 8.1); clear wavy boundary. (3 to 9 inches thick)
Bkq--9 to 12 inches; pale brown (10YR 6/3) very gravelly loam, brown (10YR 5/3) moist; weak fine subangular blocky structure; slightly hard, friable; nonsticky and nonplastic; common very fine and few fine and medium roots; many very fine and fine interstitial pores; 50 percent pebbles; lime and silica coatings 1 to 2 mm thick on undersides of coarse fragments; violently effervescent (45 percent calcium carbonate); moderately alkaline (pH 8.2); abrupt wavy boundary. (2 to 6 inches thick)
2Bkqm--12 to 14 inches; very pale brown (10YR 7/3) weakly cemented extremely gravelly loamy coarse sand, gray (10YR 6/1) moist; massive; 70 percent very hard and 30 percent hard, 70 percent very firm and 30 percent firm, nonsticky and nonplastic; few very fine dead roots; common fine and medium interstitial pores; a continuous laminar cap less than 1 mm thick is at 12 inches; 70 percent pebbles; lime and silica coatings and pendants 1 to 4 mm thick on undersides of coarse fragments; violently effervescent; strongly alkaline (pH 8.5); clear wavy boundary. (1 to 9 inches thick)
2Bkq1--14 to 26 inches; very pale brown (10YR 7/3) extremely gravelly loamy coarse sand, gray (10YR 6/1) moist; massive; hard, firm; nonsticky and nonplastic; few very fine dead roots; many very fine and few fine and medium interstitial pores; 70 percent pebbles; lime and silica pendants 2 to 4 mm thick undersides and sides of coarse fragments; violently effervescent; strongly alkaline (pH 9.0); clear wavy boundary. (2 to 15 inches thick)
2Bkq2--26 to 60 inches; very pale brown (10YR 7/3) extremely gravelly loamy coarse sand, gray (10YR 6/1) moist; single grain; loose; few very fine dead roots; common fine and medium interstitial pores; a discontinuous secondary duripan occurs at 36 inches; 70 percent pebbles and 10 percent cobbles; lime and silica coatings and pendants 1 to 4 mm thick on undersides of coarse fragments; violently effervescent; very strongly alkaline (pH 9.2).
TYPE LOCATION: Lemhi County, Idaho; about 32 miles southeast of Leadore, Idaho; about 1,500 feet south and 10 feet east from the northwest corner of sec. 16, T. 11 N., R. 29 E. Latitude - 44 degrees, 16 minutes, 25 seconds North.
Longitude - 113 degrees, 00 minutes, 48 seconds West.
RANGE IN CHARACTERISTICS:
Average annual soil temperature - 37 to 40 degrees F
Average summer soil temperature - 55 to 59 degrees F
Particle-size control section - percent total clay averages 12 to 20, percent carbonate free clay - 5 to 10 percent
Rounded coarse fragments average - 35 to 50 percent
Calcium carbonate equivalent - 40 to 65 percent
Depth to duripan (weakly cemented) - 10 to 16 inches
A horizon
Value - 5 or 6 dry, 3 or 4 moist
Reaction - slightly or moderately alkaline
Bk and Bkq horizons
Value - 6 or 7 dry, 3 through 5 moist
Chroma - 3 or 4 dry and moist
Textures - GRV-L, GRV-SL
Rock fragment content - 35 to 55 percent
2Bkq horizons
Value - 5 through 8 dry, 5 through 7 moist,
Chroma - 1 through 4 dry and moist
SAR - 13 to 30
Rounded coarse fragments - 60 to 85 percent
Calcium carbonate equivalent - 30 to 50 percent
Textures - GRX-LCOS or GRX-COS
Reaction - moderately to very strongly alkaline
Total clay - 3 to 8 percent
COMPETING SERIES: There are no competing series.
GEOGRAPHIC SETTING: Fandow soils are on outwash fans and fan terraces and have slopes of 2 to 20 percent. Elevations range from 6,000 to 7,100 feet. The soils formed in alluvium dominantly from limestone. The climate is cold and moist in winter and spring, and cool and dry in summer. Average annual precipitation is 8 to 11 inches, and average annual temperature is 35 to 38 degrees F. The frost-free period is 30 to 60 days.
GEOGRAPHICALLY ASSOCIATED SOILS: These are the Arbus, Bluedome, Mountainboy, Simeroi, Sparmo, Whitecloud and Wiggleton soils. Arbus, Simeroi, Sparmo, and Whitecloud soils are on outwash fans and fan terraces and do not have duripans. Mountainboy and Wiggleton soils are on fan terraces and have mollic epipedons. Bluedome soils are moderately deep to a strongly cemented duripan.
DRAINAGE AND PERMEABILITY: Well drained; runoff is slow; permeability is moderate above the duripan and very rapid below the pan.
USE AND VEGETATION: Rangeland. Vegetation is mainly low sagebrush, black sagebrush and bluebunch wheatgrass.
DISTRIBUTION AND EXTENT: East central Idaho. These soils are moderately extensive.
MLRA OFFICE RESPONSIBLE: Portland, Oregon
SERIES ESTABLISHED: Lemhi County, Idaho, 1999.
REMARKS: Diagnostic features recognized in this pedon are:
Ochric epipedon
Duripan - The zone from 12 to 14 inches (2Bkqm horizon).
Calcic horizon - The zone from 3 to 60 inches (Bk, Bkq, 2Bkqm, 2Bkq1, and 2Bkq2 horizons).
Particle-size control section - The zone from 0 to 12 inches (A, Bk, and Bkq horizons).
ADDITIONAL DATA: S82ID-59-006