LOCATION LATIGO IDTentative Series
TAXONOMIC CLASS: Loamy-skeletal, mixed, superactive Calcic Argicryolls
TYPICAL PEDON: Latigo gravelly silt loam - on a nearly level southwest facing slope of 3 percent under grass and shrubs at 6,820 feet in rangeland. (Colors are for dry soil unless otherwise stated. When described on September 24, 1981, the soil was moist below 12 inches.)
A1--0 to 6 inches; very dark grayish brown (10YR 3/2) gravelly silt loam, very dark brown (10YR 2/2) moist; moderate medium and fine subangular blocky structure parting to moderate medium and fine granular; slightly hard, very friable and slightly plastic; many very fine and fine, few medium and coarse roots; common very fine and fine tubular pores; 20 percent gravel; neutral (pH 7.2); gradual wavy boundary. (5 to 7 inches thick)
A2--6 to 14 inches; dark brown (10YR 3/3) very cobbly silt loam, very dark grayish brown (10YR 3/2); moderate medium and fine subangular blocky structure parting to moderate medium and fine granular; slightly hard, very friable and slightly plastic; many very fine and fine, few medium and coarse roots; common very fine and fine tubular pores; 35 percent cobbles, 10 percent gravel; neutral (pH 7.2); clear wavy boundary. (6 to 9 inches thick)
Bt--14 to 21 inches; yellowish brown (10YR 5/4) very gravelly silt loam, dark brown (10YR 4/3) moist; common fine subangular blocky structure; hard, friable, slightly sticky and slightly plastic; many very fine and fine, few medium and coarse roots; common very fine tubular pores; common faint clay films on peds faces and lining tubular pores; 40 percent gravel, 15 percent cobbles; neutral (pH 7.2); abrupt smooth boundary. (6 to 15 inches thick)
Bk1--21 to 32 inches; white (10YR 8/1) very cobbly silt loam, pale brown (10YR 6/3) moist; massive; slightly hard, friable, slightly sticky and slightly plastic; common very fine and fine, few medium and coarse roots; common very fine tubular pores; violently effervescence (40 percent calcium carbonate); disseminated lime; 35 percent cobbles, 15 percent gravel; moderately alkaline (pH 8.0); gradual wavy boundary. (10 to 21 inches thick)
Bk2--32 to 43 inches; white (10YR 8/1) extremely cobbly sandy loam, light gray (10YR 7/2) moist; massive; slightly hard, friable and slightly plastic; few very fine roots; few very fine tubular pores; violently effervescence (25 percent calcium carbonate); disseminated lime; 50 percent cobbles, 30 percent gravel; moderately alkaline (pH 8.0); gradual wavy boundary. (11 to 34 inches thick)
Bk3--43 to 60 inches; white (10YR 8/1) extremely cobbly sandy loam, pale brown (10YR 6/3) moist; massive; slightly hard, very friable, nonsticky and nonplastic; violent effervescence (10 percent calcium carbonate); disseminated lime; 60 percent cobbles, 30 percent gravels; moderately alkaline (pH 8.0). (15 to 22 inches thick)
TYPE LOCATION: Clark County, Idaho; about 9 miles west and 6 miles south of Small, Idaho; 2,000 feet east and 1,320 feet south of the northwest corner of section. 10, T. 12 N., R. 33 E.
RANGE IN CHARACTERISTICS:
Xeric soil moisture regime
Weighted average of percent clay in the control section -
17 to 20
Weighted average of percent coarse fragments in the control section - 35 to 60
Average annual soil temperature - 37 to 41 degrees F.
Depth to calcic horizon - 18 to 31 inches
A horizon
Thickness - 11 to 15 inches
Color value, dry - 3 or 4
Value, moist - 2 or 3
Chroma - 2 or 3
Bt horizon
Thickness - 6 to 15 inches
Color value, dry - 4 through 6
Value, moist - 3 or 4
Chroma - 2 through 4
Texture - very gravelly silt loam, very cobbly silt loam
Bk horizon
Thickness - 26 to 41 inches
Color value, dry - 6 through 8
Value, moist - 4 through 7
Chroma - 1 through 4
Texture - very cobbly loam through silt loam, extremely cobbly loam through extremely cobbly sandy loam
calcium carbonate equivalent - 10 to 40 percent
Reaction - moderately or strongly alkaline
COMPETING SERIES: These are the Blaine, Bowen, Buena Vista, Elwood, Ess, Fourmile (T), Geertsen, Hoodle, Libeg, Nathrop, Norriston, Nurkey (T), Packer, Parkview, Quander, Tahquats, Thiel, Winada, Woodhall, and Zeebar (T) soils. Blaine, Bowen, Buena Vista, Elwood, Nathrop, Parkview, and Woodhall soils have bedrock at depths shallower than 40 inches. Winada soils have a paralithic contact at depths shallower than 40 inches. Ess, Fourmile, Libeg, Norriston, Packer, Quander, Tahquats, and Zeebar soils are noncalcareous throughout. Geertsen soils have an 0 horizon and a solum thickness up to 50 inches thick, and a mean annual soil temperature of about 41 to 46 degrees F. Hoodle soils are slightly acid in the surface horizon, have sandy clay loam and clay loam textures in the Bt horizon. Nurkey soils have less than 16 inches average annual precipitation, and depth to lime is less than 10 inches. Thiel soils have sand and gravel at depths of 20 to 40 inches.
GEOGRAPHIC SETTING: Latigo soils are on nearly level to steep rhyolite plains at elevations of 6,400 to 7,200 feet. Slopes are 1 to 70 percent. The soils formed in calcareous loess and slope alluvium from material weathered from rhyolite. Average annual precipitation is 16 to 20 inches. Average annual temperature is 35 to 42 degrees F. The frost-free period is 40 to 60 days.
GEOGRAPHICALLY ASSOCIATED SOILS: These are the Argora (T), Blackhorse (T), Fulcher, Tineman, Windicreek (T), Zeale (T), and Zeebar (T) soils. Argora soils are calcareous throughout, lack a mollic epipedon and are on steep and very steep canyon side slopes. Blackhorse and Fulcher soils have greater than 35 percent clay in the textural control section. Blackhorse soils are found in concavities. Fulcher soils are found on higher fan terraces. Tineman and Windicreek soils lack a layer of clay accumulation and are found on higher fan terraces. Zeale soils have greater than 40 percent lime in the control section and are found on higher fan terraces and mountain slopes. Zeebar soils lack a layer of lime accumulation and are found on higher fan terraces.
DRAINAGE AND PERMEABILITY: Well drained; runoff is slow on nearly level slopes, medium on rolling and rapid on steeper slopes; permeability is moderate.
USE AND VEGETATION: This soil is used principally for rangeland. Vegetation is mainly Idaho fescue and mountain big sage.
DISTRIBUTION AND EXTENT: These soils are inextensive in southeast Idaho.
MLRA OFFICE RESPONSIBLE: Portland, Oregon
SERIES PROPOSED: Clark County, Idaho, 1982.
REMARKS: Diagnostic horizons and other features:
Mollic epipedon - 0 to 14 inches
Argillic horizon - 14 to 21 inches
Calcic horizon - 21 to 43 inches
This soil would classify as a Calcic Argicryoll if such a subgroup existed.