LOCATION HOGSBY MTEstablished Series
TAXONOMIC CLASS: Loamy-skeletal, mixed, superactive, frigid Lithic Haploxerolls
TYPICAL PEDON: Hogsby gravelly loam, in rangeland (colors are for dry soil unless otherwise noted).
A1--0 to 6 inches; dark grayish brown (10YR 4/2) gravelly loam, very dark grayish brown (10YR 3/2) moist; moderate medium granular structure; soft, very friable, slightly sticky and slightly plastic; many fine roots, many fine pores; 20 percent pebbles; neutral (pH 7.0); abrupt smooth boundary. (6 to 10 inches thick)
A2--6 to 15 inches; brown (10YR 5/3) extremely channery loam, dark brown (10YR 3/3) moist; moderate medium subangular blocky structure; soft, very friable, slightly sticky and slightly plastic; many fine roots; many fine pores; 55 percent channers, 15 percent flagstones; neutral (pH 7.0); abrupt smooth boundary. (5 to 10 inches thick)
R--15 inches; quartzite bedrock.
TYPE LOCATION: Lake County, Montana; 200 feet east and 800 feet north of the SW corner of sec. 19, T. 23 N., R. 21 W.
RANGE IN CHARACTERISTICS:
Soil temperature - 43 to 47 degrees F.
Moisture control section - between 4 and 12 inches.
Mollic epipedon thickness - 7 to 15 inches.
Depth to bedrock - 10 to 20 inches.
Some soils have a thin cambic horizon above the bedrock.
Soil phases - stony.
A1 horizon - Hue: 2.5Y, 10YR, 7.5YR, or 5YR
Value: 4 or 5 dry; 2 or 3 moist
Chroma: 2 or 3
Texture: loam or sandy loam
Clay content: 5 to 20 percent
Rock fragments: 5 to 35 percent--0 to 10 percent stones, 0 to 5 percent cobbles or flagstones, 5 to 30 percent pebbles or channers
Reaction: 6.6 to 7.3
A2 horizon - Hue: 2.5Y, 10YR, 7.5YR, or 5YR
Value: 5 to 6 dry; 3 to 4 moist
Chroma: 2 or 3
Texture: loam or sandy loam
Clay content: 10 to 20 percent
Rock fragments: 45 to 80 percent--15 to 25 percent cobbles or flagstones, 30 to 55 percent pebbles or channers
Reaction: 6.6 to 7.3
COMPETING SERIES:
Agassiz (UT) - are usually moist, receive 20 to 35 inches of precipitation, have rock fragments that are calcareous sandstone or limestone.
Alomax (CA) - never freeze, have a 210 day frost free season, have rock fragments that are mainly stone size.
Anatone (WA) - formed in loess and volcanic ash, are moist during the winter months.
Bocker (WA) - are 4 to 10 inches deep to bedrock.
Cedaran (NV) - formed in pyroclastic materials, are over tuff bedrock, are dry from approximately June through October.
Dipcreek ID) - has mean annual soil temperature of 39 to 43 degrees F., has Bw horizons 6 to 10 inches thick.
Falula (UT) - have horizons of secondary carbonate accumulation.
Foxol (UT) - are slightly to medium acid throughout the soil.
Gando (NV) - have horizons of secondary carbonate accumulation.
Gomine (UT) - have more than 20 percent clay in the particle-size control section.
Grink (NV) - have horizons of secondary carbonate accumulation.
Little Pole (UT) - have a cambic horizon with clay films, receive moisture mainly as snow, are dry in the months of May and June.
Nayrib (ID) - are 6 to 10 inches deep to bedrock.
Rexmont (UT) - are moderately to strongly alkaline, are calcareous in the A2 horizon, are usually dry all summer, are over limestone bedrock.
Swanner (ID) - are extremely stony and have a horizon of secondary carbonate accumulation.
Van Wagoner (UT) - are medium acid to neutral in the C horizon, are usually dry in the months of May, June, and July.
GEOGRAPHIC SETTING:
Landform - mountains and hills.
Elevation - 2,600 to 6,000 feet.
Slope- 8 to 60 percent.
Parent material - colluvium derived from argillite and quartzite.
Mean annual precipitation - 14 to 20 inches.
Mean annual temperature - 39 to 43 degrees F.
Frost-free period - 90 to 120 days.
DRAINAGE AND PERMEABILITY: Well drained; moderate permeability.
USE AND VEGETATION: The Hogsby soils are used mainly as rangeland. The potential native vegetation is mainly bluebunch wheatgrass, rough fescue, Columbia needlegrass, and Idaho fescue.
DISTRIBUTION AND EXTENT: The Hogsby soils are of moderate extent in western Montana.
MLRA OFFICE RESPONSIBLE: Bozeman, Montana
SERIES ESTABLISHED: Lake County, Montana, 1991; proposed in Lake County, Montana, 1990.
REMARKS: Soil interpretation records: MT1247, MT1248. Diagnostic horizons and features recognized in this pedon are: a mollic epipedon from the soil surface to 15 inches (A and Bw horizons); a particle size control section from 10 to 15 inches (Bw horizon); a lithic contact at 15 inches (R horizon). Hogsby soils have a frigid temperature regime and a xeric moisture regime.