LOCATION RAYNOLDSON IDEstablished Series
TAXONOMIC CLASS: Loamy-skeletal, mixed, superactive Calcic Pachic Haplocryolls
TYPICAL PEDON: Raynoldson gravelly loam--on a 2 percent simple west-facing slope in rangeland. When described on July 26, 1984, the soil was moist to 12 inches and dry below. (Colors are for dry soil unless otherwise noted.)
A1--0 to 6 inches; dark yellowish brown (10YR 4/4) gravelly loam, very dark grayish brown (10YR 3/2) moist; weak fine subangular blocky structure; soft, very friable, slightly sticky and slightly plastic; many very fine and fine and few medium and coarse roots; common very fine and fine and few medium tubular pores; 25 percent gravel; moderately alkaline (pH 7.9); gradual smooth boundary. (4 to 6 inches thick)
A2--6 to 12 inches; dark yellowish brown (10YR 4/4) gravelly loam, dark brown (10YR 3/3) moist; moderate fine subangular blocky structure; soft, very friable, slightly sticky and slightly plastic; many very fine and fine and few medium and coarse roots; many very fine and fine and few medium tubular pores; 30 percent gravel; moderately alkaline (pH 7.9); clear smooth boundary. (6 to 9 inches thick)
Bw--12 to 18 inches; dark yellowish brown (10YR 4/4) very gravelly loam, dark brown (10YR 3/3) moist; moderate fine and medium subangular blocky structure; slightly hard, friable, slightly sticky and slightly plastic; many very fine and fine and few medium and coarse roots; common very fine and fine tubular pores; 40 percent gravel, 5 percent cobbles; moderately alkaline (pH 7.9); gradual smooth boundary. (6 to 15 inches thick)
2Bk1--18 to 32 inches; variegated dominantly dark yellowish brown (10YR 4/4) extremely gravelly sandy loam, dark yellowish brown (10YR 3/4) moist; single grain; loose; many very fine and fine and few medium roots; violently effervescent; calcium carbonate coatings 1 mm thick on rock fragments; 50 percent gravel, 15 percent cobbles; moderately alkaline (pH 8.1); gradual smooth boundary. (7 to 16 inches thick)
2Bk2--32 to 60 inches; variegated dominantly dark yellowish brown (10YR 4/4) extremely gravelly loamy sand, dark yellowish brown (10YR 3/4) moist; single grain; loose; many very fine and fine roots; violently effervescent; calcium carbonate coatings 2 mm thick on rock fragments; 45 percent gravel, 20 percent cobbles; moderately alkaline (pH 8.2)
TYPE LOCATION: Fremont County, Idaho; about 1 mile north of the Island Park airport; about 2,600 feet west and 1,100 feet south of the northeast corner, sec. 11, T.15N., R. 43E.
RANGE IN CHARACTERISTICS:
Average annual soil temperature - 36 to 42 degrees F. Average summer soil temperature - 54 to 59 degrees F. The soil is dry for 45 to 100 consecutive days during the four months following the summer solstice. Particle-size control section - Average percent clay: 4 to 12 percent. Reaction - neutral to moderately alkaline. Depth to the calcic horizon- 16 to 30 inches. Thickness of mollic epipedon - 16 to 30 inches
A horizon Hue - 10YR or 7.5YR Value - 3 or 4 dry, 2 or 3 moist. Chroma - 2 to 4 dry, 1 to 3 moist.
Bw horizon Value - 4 to 5 dry, 2 or 3 moist. Chroma - 2 to 6 dry, 2 or 3 moist. Coarse fragments - 20 to 70 percent. Percent clay - 8 to 12 percent
2Bk horizons Texture - GRX-LS, GRX-SL, GRV-SL. Coarse fragments: Pebbles - 45 to 60 percent. Cobbles and stones - 10 to 30 percent. Percent clay - 2 to 12 percent. Calcium carbonate equivalent - 5 to 15 percent
COMPETING SERIES: These are the Eganroc, Levengood (T), Meegernot (T), Polum, and Polumar (T) series. Eganroc soils are moderately deep to hard bedrock. Levengood soils have 15 to 30 percent clay in the particle-size control section. Meegernot soils have 20 to 26 percent clay in the particle-size control section. Polum soils have 12 to 18 percent clay in the particle-size control section. Polumar soils are deep to hard bedrock and have 14 to 18 percent clay in the particle-size control section.
GEOGRAPHIC SETTING: Raynoldson soils are on nearly level to sloping fan terraces and fan remnants. They formed in gravelly alluvium. Elevation is 5,000 to 7,400 feet. The slopes are 1 to 15 percent. Average annual precipitation is 18 to 24 inches. Average annual temperature is 34 to 40 degrees F. The frost-free season is 30 to 60 days.
GEOGRAPHICALLY ASSOCIATED SOILS: These are the Fourme, Kitchell and Lionhead series. Fourme soils have an argillic horizon and are on broad, gently sloping fan terraces. Kitchell soils have a carbonatic mineralogy are forested, and are on north and east-facing mountain slopes. Lionhead soils lack calcic horizons and are on steep mountain slopes.
DRAINAGE AND PERMEABILITY: Well drained. Runoff is medium. Permeability is moderate in the upper portion of the profile and rapid below.
USE AND VEGETATION: Raynoldson soils are used principally as rangeland. Vegetation is mainly Idaho fescue, mountain brome and mountain big sagebrush.
DISTRIBUTION AND EXTENT: Raynoldson soils are of small extent in southeastern Idaho.
MLRA SOIL SURVEY REGIONAL OFFICE (MO) RESPONSIBLE: Portland, Oregon
SERIES ESTABLISHED: Fremont County, Idaho, 1989.
REMARKS: Diagnostic horizons and features recognized in this pedon are:
Mollic epipedon - The zone from the surface to 18 inches (A1, A2, and Bw horizons).
Calcic horizon - the zone from 18 to 60 inches (2Bk1 and 2Bk2 horizons).
Particle-size control section - The zone from 10 to 40 inches (part of the A2 horizon, the Bw, 2Bk1 horizons and part of the 2Bk2 horizon).
Soil moisture regime - xeric
This draftr reflects a change in classification from mixed Calcic Pachic Cryoborolls to mixed, superactive Calcic Pachic Cryoborolls based on Soil Taxonomy issue #18.