LOCATION BOYDHOLLOW IDEstablished Series
The Boydhollow series consists of very deep, well drained soils formed in slope alluvium and residuum derived from sandstone and conglomerate. These soils are on hillslopes and mountain slopes. Slopes are 15 to 65 percent. Permeability is moderately rapid. The average annual precipitation is about 16 inches and the average annual temperature is about 37 degrees F.
TAXONOMIC CLASS: Loamy-skeletal, mixed, superactive Pachic Haplocryolls
TYPICAL PEDON: Boydhollow gravelly loam, rangeland - on a east-north-east facing concave slope of 50 percent at an elevation of 7,000 feet. (Colors are for dry soil unless otherwise stated.)
A1--0 to 3 inches; dark grayish brown (10YR 4/2) gravelly loam, very dark brown (10YR 2/2) moist; weak fine subangular blocky structure parting to moderate fine granular; soft, very friable, nonsticky and nonplastic; many very fine and medium roots; many fine interstitial pores; 25 percent gravel; neutral (pH 7.0); abrupt smooth boundary. (3 to 8 inches thick)
A2--3 to 11 inches; dark grayish brown (10YR 4/2) very gravelly loam, very dark brown (10YR 2/2) moist; weak fine subangular blocky structure parting to moderate fine granular; soft, very friable, nonsticky and nonplastic; many very fine and medium roots; common very fine interstitial pores; 35 percent gravel and 5 percent cobbles; neutral (pH 7.2); clear wavy boundary. (5 to 8 inches thick)
A3--11 to 19 inches; brown (7.5YR 4/3) very gravelly sandy loam, dark brown (7.5YR 3/3) moist; weak fine subangular blocky structure; soft, very friable, nonsticky and nonplastic; many very fine and medium roots; common very fine tubular pores; 50 percent gravel and 5 percent cobbles; neutral (pH 7.3); clear wavy boundary. (6 to 12 inches thick)
Bw--19 to 41 inches; reddish brown (5YR 5/4) extremely gravelly sandy loam, reddish brown (5YR 4/4) moist; weak fine subangular blocky structure; slightly hard, very friable, nonsticky and nonplastic; common very fine and fine roots; many very fine and fine tubular pores; 60 percent gravel and 5 percent cobbles; neutral (pH 7.2); abrupt wavy boundary. (12 to 24 inches thick)
Bk1--41 to 57 inches; light gray (10YR 7/2) extremely gravelly sandy loam, pale brown (10YR 6/3) moist; weak fine and medium subangular blocky structure; hard, firm, nonsticky and nonplastic; few very fine and fine roots; few very fine tubular pores; 65 percent gravel and 10 percent cobbles; violently effervescent disseminated lime, few fine soft masses of lime and lime coatings on all sides of coarse fragments; moderately alkaline (pH 8.2); abrupt wavy boundary; clear wavy boundary. (7 to 17 inches thick)
Bk2--57 to 65 inches; pale brown (10YR 6/3) extremely gravelly loamy sand, brown (10YR 5/3) moist; weak fine subangular blocky structure; slightly hard, very friable, nonsticky and nonplastic; 65 percent gravel and 10 percent cobbles; strongly effervescent disseminated lime, few fine soft masses of lime and lime coatings on all sides of coarse fragments; moderately alkaline (pH 8.2)
TYPE LOCATION: Bear Lake County, Idaho; about 3.5 miles southeast of Pegram, Idaho; 2,400 feet west and 1,500 feet north of the southeast corner of section 21, T. 15 S., R. 46 E. (Latitude 42 degrees 06 minutes 2.8 seconds N., Longitude 111 degrees 04 minutes 52.7 seconds W.)
RANGE IN CHARACTERISTICS:
Soil moisture control section - usually moist, dry for 45 consecutive days or more following the summer solstice. Xeric soil moisture regime.
Mollic epipedon thickness - 16 to 28 inches
Average annual soil temperature - 38 to 43 degrees F.
Average summer soil temperature - 54 to 59 degrees F.
Depth to secondary carbonates - 40 to 55 inches
Particle-size control section
Clay content - 8 to 18 percent clay
Rock fragments - 35 to 65 percent
A1 horizon
Hue: 7.5YR or 10YR
Value: 3 or 4 dry, 2 or 3 moist
Chroma: 1 to 3 dry or moist
Clay content: 10 to 18 percent
Rock fragments: 15 to 30 percent gravel
Reaction: slightly acid or neutral
A2 and A3 horizons
Hue: 10YR or 7.5YR
Value: 3 or 4 dry, 2 or 3 moist
Chroma: 1 to 3 dry or moist
Texture: GRV-L, GRV-SL
Clay content: 10 to 18 percent
Rock fragments - 35 to 60 percent; 35 to 60 percent gravel and 0 to 10 percent cobbles
Reaction: slightly acid to slightly alkaline
Bw horizon
Hue: 7.5YR or 5YR
Value: 4 to 6 dry, 3 to 5 moist
Chroma: 3 or 4 dry or moist
Texture: GRV-L, GRV-FSL, GRX-SL
Clay content: 8 to 18 percent
Rock fragments: 40 to 70 percent; 35 to 65 percent gravel and 5 to 10 percent cobbles
Reaction: slightly acid or neutral
Bk horizons
Hue: 10YR, 7.5YR or 5YR
Value: 6 or 7 dry, 5 or 6 moist
Chroma: 2 to 4 dry or moist
Texture: GRX-SL, GRX-LS, GRV-SL
Clay content: 5 to 10 percent
Calcium carbonate equivalent 5 to 15 percent
Rock fragments: 40 to 75 percent; 35 to 65 percent gravel and 5 to 15 percent cobbles
Reaction: slightly or moderately alkaline
COMPETING SERIES:
Baconcamp - lithic contact at 20 to 40 inches.
Badhap - 18 to 27 percent clay in the control section and lack Bk horizons.
Beehunt (T) - 18 to 27 percent clay in the control section and lack Bk horizons.
Behanco - 40 to 60 inches to lithic contact and 18 to 27 percent clay in the control section.
Belsac - 25 to 40 inches to paralithic contact.
Bullrey - 18 to 27 percent clay in the control section and lack Bk horizons.
Busterback - do not have a horizon with secondary carbonate accumulation.
Croesus - lithic contact at 20 to 40 inches.
Dressel - udic moisture regime, 20 to 30 percent clay in the control section, and do not have a horizon with secondary carbonate accumulation.
Gateview - do not have a cambic horizon or a horizon with secondary carbonate accumulation.
Hapgood - lithic contact at 40 to 60 inches and 18 to 27 percent clay in the control section.
Harcany - lithologic discontinuity in the control section and do not have a horizon with secondary carbonate accumulation.
Hobacker - calcium carbonates at a depth of 20 inches or less.
Lionhead - horizon with secondary carbonate accumulation at 18 to 37 inches.
Lolon - lithologic discontinuity at 20 to 40 inches.
Marcetta - 18 to 25 percent clay in the control section, an E horizon, and an ustic moisture regime.
Mundos - secondary carbonate accumulation at 10 to 30 inches and 18 to 35 percent clay in the control section.
Nagitsy - lithic contact at 20 to 40 inches.
Namela - lithic contact at 20 to 40 inches.
Nazaton - udic soil moisture regime and have an organic surface layer.
Nevatah - lithic contact at 20 to 40 inches.
Papaspila - udic moisture regime, 18 to 35 percent clay in the control section, and do not have a horizon with secondary carbonate accumulation.
Parkcity - have a udic soil moisture regime and do not have a horizon with secondary carbonate accumulation.
Poleline - lithic contact at 40 to 60 inches and do not have a horizon with secondary carbonate accumulation.
Povey - do not have a horizon with secondary carbonate accumulation.
Snacreek (T) - do not have a horizon with secondary carbonate accumulation.
Snopoc - do not have a horizon with secondary carbonate accumulation.
Splitbutte - lithic contact at 20 to 40 inches.
Tonigut - paralithic contact at 40 to 60 inches
GEOGRAPHIC SETTING:
Landform - hillslopes and mountain slopes.
Parent material - slope alluvium and residuum from sandstone and conglomerate.
Slope range - 15 to 65 percent.
Elevation range - 6,300 to 7,700 feet.
Average annual precipitation - 15 to 20 inches.
Average annual temperature - 35 to 40 degrees F.
Frost-free season - 50 to 70 days.
GEOGRAPHICALLY ASSOCIATED SOILS: These are the Boundridge (T), Pontuge (T), Slan (T) and Warshod (T) soils. Boundridge soils are on gently sloping summits, have a duripan within 20 inches and have a mollic epipedon less than 16 inches thick.. Pontuge soils are on less-sloping north and east facing side slopes and have an argillic horizon. Slan soils are on southerly facing side slopes, have a paralithic contact at 20 to 40 inches and are frigid. Warshod soils are on the same position as Boydhollow soils but at lower elevations, are frigid, and have a paralithic contact at 40 to 60 inches.
DRAINAGE AND PERMEABILITY: Well drained; very rapid runoff; moderately rapid permeability.
USE AND VEGETATION: These soils are used mainly for rangeland, wildlife habitat, and watershed. Native vegetation is mountain big sagebrush, serviceberry, arrowleaf balsamroot, and bluebunch wheatgrass.
DISTRIBUTION AND EXTENT: Southeast, Idaho. These soils are of small extent. MLRA 43B.
MLRA SOIL SURVEY REGIONAL OFFICE (MO) RESPONSIBLE: Bozeman, Montana
SERIES ESTABLISHED: Bear Lake County, Idaho, 2008.
REMARKS: Diagnostic horizons and features recognized in this pedon are:
Mollic epipedon - the zone from 0 to 19 inches (A1, A2, and A3 horizons)
Cambic horizon - the zone from 19 to 41 inches (Bw horizon)
Calic horizon - the zone from 41 to 65 inches (Bk horizon). Meets calcic criteria for horizons with less than 18 percent clay.
Particle-size control section - the zone from 10 to 40 inches (part of the A2 horizon, the A3 and part of the Bw horizon)