LOCATION SIDDOWAY IDEstablished Series
TAXONOMIC CLASS: Sandy, mixed, frigid Calcic Haploxerolls
TYPICAL PEDON: Siddoway loamy fine sand on a southwest-facing convex slope of 3 percent under sagebrush and grass at 5,140 feet elevation. (On May 26, 1982, when described, the soil was moist throughout the profile. Colors are for dry soil unless otherwise noted.)
A1--0 to 5 inches; dark brown (10YR 3/3) loamy fine sand; very dark grayish brown (10YR 3/2) moist; weak fine subangular blocky structure; soft, very friable, nonsticky and nonplastic; many fine and very fine roots; few very fine tubular pores; neutral (pH 7.2); clear smooth boundary. (2 to 5 inches thick)
A2--5 to 19 inches; dark brown (10YR 4/3) loamy fine sand; very dark grayish brown (10YR 3/2) moist; weak medium and fine subangular blocky structure; soft, very friable, nonsticky and nonplastic; common fine and very fine and few medium roots; few very fine tubular pores; 5 percent pebbles; mildly alkaline (pH 7.8); clear wavy boundary. (7 to 14 inches thick)
Bw--19 to 28 inches; brown (10YR 5/3) loamy fine sand; dark brown (10YR 3/3) moist; weak medium prismatic structure parting to moderate medium subangular blocky; soft, friable, nonsticky and slightly plastic; common fine and very fine roots; few very fine tubular pores; 5 percent pebbles; mildly alkaline (pH 7.8); clear wavy boundary. (9 to 10 inches thick)
Bk1--28 to 40 inches; pale brown (10YR 6/3) loamy fine sand; brown (10YR 5/3) moist; moderate medium subangular blocky structure; slightly hard, friable, nonsticky and nonplastic; few very fine roots; few very fine tubular pores; 10 percent pebbles; violent effervescence; moderately alkaline (pH 8.2); clear smooth boundary. (12 to 19 inches thick)
Bk2--40 to 48 inches; pale brown (10YR 6/3) loamy fine sand; brown (10YR 5/3) moist; massive; slightly hard, friable, nonsticky and nonplastic; few very fine roots; few very fine tubular pores; 10 percent pebbles; violent effervescence; moderately alkaline (pH 8.4); clear wavy boundary. (9 to 19 inches thick)
Bk3--48 to 53 inches; white (10YR 8/2) loamy fine sand; pale brown (10YR 6/3) moist; massive; slightly hard, friable, nonsticky and nonplastic; few very fine roots; common very fine tubular pores; 10 percent pebbles and 5 percent cobbles; violent effervescence; strongly alkaline (pH 8.6); abrupt wavy boundary. (0 to 5 inches thick)
2R--53 inches; basalt bedrock.
TYPE LOCATION: Fremont County, Idaho; about 7 miles north of Parker, Idaho; 3,630 feet west, 2,340 feet south of northeast corner sec. 7, T.8N., R.40E.
RANGE IN CHARACTERISTICS:
Textural control section (averages) - 10 to 40 inches
Sand - 75 to 85 percent
Clay - 7 to 12 percent
Pebbles - 0 to 20 percent
Profile ranges
Thickness of mollic epipedon - 18 to 40 inches
Depth to carbonates - 18 to 29 inches
Average annual soil temperature - 39 to 42 degrees F
Depth to bedrock - 40 to greater than 60 inches
A horizon
color value, dry - 3 or 4
value, moist - 2 or 3
chroma, dry and moist - 2 or 3
B horizon
reaction - moderately alkaline or strongly alkaline
color value, dry - 4 through 8
value, moist - 3 through 6
chroma, dry and moist - 2 or 3
texture - LS, LFS, GR-S, GR-LFS, GRV-LFS
pebbles - 0 to 40 percent
COMPETING SERIES: There are no other series in the same family. The closely related Jipper soil has less than 75 percent sand in the control section.
GEOGRAPHIC SETTING: Siddoway soils are on nearly level basalt plains to steep hills, at elevations of 5,000 feet to 6,100 feet. Slopes are from 1 to 25 percent. These soils formed in eolian deposits influenced by loess and slope alluvium from mixed sources. The average annual precipitation is 14 to 18 inches; the average annual air temperature is 37 to 41 degrees F; the average summer temperature ranges from 62 to 67 degrees F; and the frost-free season ranges from 70 to 100 days.
GEOGRAPHICALLY ASSOCIATED SOILS: These are the Jipper, Nayrib, Stipe, and Wolverine series. The Jipper soils are mainly on nearly level basalt plains and have textures finer than loamy fine and. Nayrib soils are mainly on or near rock outcrops and are very shallow over basalt. Stipe soils are on rolling basalt plains and are less than 40 inches deep. Wolverine soils are on stabilized dunes and lack mollic epipedons.
DRAINAGE AND PERMEABILITY: Well drained; slow runoff; rapid permeability.
USE AND VEGETATION: Siddoway soils are used for range and wildlife habitat. Principal vegetation is antelope bitterbrush, basin big sagebrush, needlegrass, Indian ricegrass, chokecherry, and snowberry.
DISTRIBUTION AND EXTENT: Siddoway soils are inextensive 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 28 inches (including the A1, A2 and Bw horizons).
Particle-size control section - the zone from 10 to 40 inches (includes part of the A2, and the Bw and Bk1 horizons).