LOCATION JERICHO UT+NVEstablished Series
TAXONOMIC CLASS: Loamy-skeletal, mixed, superactive, mesic, shallow Xeric Haplodurids
TYPICAL PEDON: Jericho gravelly fine sandy loam--rangeland. (Colors are for dry soil unless otherwise noted).
A--0 to 5 inches; pale brown (10YR 6/3) gravelly fine sandy loam, brown (10YR 4/3) moist; weak thin platy structure parting to weak fine granular; soft, very friable, slightly sticky and nonplastic; common very fine and fine roots; many very fine pores; 20 percent pebbles, 10 percent cobbles, and 1 percent stones; strongly effervescent; moderately alkaline (pH 8.0); clear smooth boundary. (2 to 5 inches thick)
Bw--5 to 9 inches; light yellowish brown (10YR 6/4) gravelly fine sandy loam, dark yellowish brown (10YR 4/4) moist; weak fine subangular blocky structure; soft, friable, slightly sticky and slightly plastic; common very fine and fine roots; many very fine pores; 20 percent pebbles, 10 percent cobbles, and 1 percent stones; strongly effervescent; moderately alkaline (pH 8.2); clear smooth boundary. (0 to 6 inches thick)
Bk--9 to 13 inches; very pale brown (10YR 7/3) very gravelly fine sandy loam, brown (10YR 5/3) moist; weak fine subangular blocky structure; soft, friable, slightly sticky and slightly plastic; few very fine and fine roots; many very fine pores; 30 percent pebbles, 15 percent cobbles, and 2 percent stones; secondary calcium carbonate segregated throughout matrix; violently effervescent; moderately alkaline (pH 8.2); clear wavy boundary. (0 to 10 inches thick; combined thickness of Bk or Bkq horizons is 6 inches greater)
Bkq--13 to 19 inches; very pale brown (10YR 8/3) very gravelly fine sandy loam, pale brown (10YR 6/3) moist; massive; hard, friable, slightly sticky and slightly plastic; few very fine roots; many very fine pores; 40 percent pebbles, 15 percent cobbles, and 2 percent stones; secondary calcium carbonate and silica segregated throughout matrix; violently effervescent; moderately alkaline (pH 8.4); abrupt wavy boundary. (0 to 6 inches thick; combined thickness of Bk or Bkq horizons is 6 inches greater)
Bqkm--19 to 30 inches; duripan; very hard and brittle; an indurated laminar cap about 1 mm thick stops roots; material below cap breaks down with difficulty to a very gravelly sandy loam; secondary calcium carbonate and silica segregated throughout matrix; violently effervescent; strongly alkaline (pH 8.6); clear wavy boundary. (5 to 18 inches thick)
C--30 to 42 inches; very pale brown (10YR 8/4) very gravelly loamy sand, very pale brown (10YR 7/4) moist; single grain; loose; nonsticky and nonplastic; 45 percent pebbles; neutral (pH 7.2); abrupt wavy boundary. (6 to 38 inches thick)
Bqkmb--42 inches; duripan; characteristics similar to Bqkm.
TYPE LOCATION: Juab County, Utah; about 6 miles north of Jericho; 2,300 feet east and 1,800 feet south of the northwest corner of section 9, T. 12 S., R. 3 W.
RANGE IN CHARACTERISTICS:
Soil moisture - These soils are dry for 55 to 75 percent of the time that the soil temperature at 20 inches is above 41 degrees F; aridic moisture regime that borders on xeric.
Mean annual soil temperature - 47 to 52 degrees F.
Mean summer soil temperature - 62 to 66 degrees F.
Depth to calcic horizon - 2 to 10 inches.
Depth to duripan - 14 to 20 inches.
Control section - Clay content: 10 to 18 percent; Rock fragments: 35 to 60 percent, mainly pebbles. Lithology of fragments are mixed.
Other features - Some pedons have buried duripans below 40 inches.
A horizon - Value: 5 through 7 dry, 3 through 5 moist.
Chroma: 2 through 4, dry or moist.
Rock fragments: 15 to 45 percent.
Reaction: Moderately alkaline or strongly alkaline.Calcium carbonate equivalent: 3 to 20 percent.
Effervescence: Slightly effervescent to violently effervescent.
Bw horizon (when present) - Value: 5 through 7 dry, 4 or 5 moist.
Chroma: 2 through 4, dry or moist.
Texture: Gravelly sandy loam, gravelly fine sandy loam, gravelly coarse sandy loam, or very gravelly sandy loam.
Consistence: Very friable or friable, moist.
Rock fragments: 15 to 45 percent.
Reaction: Moderately alkaline or strongly alkaline.
Calcium carbonate equivalent: 5 to 30 percent.
Salinity (EC): 0 to 2 mmhos/cm.
Sodicity (SAR): 0 to 5.
Effervescence: Slightly effervescent to violently effervescent.
Bk horizon and Bkq horizon (when present) - Value: 6 through 8 dry, 5 through 7 moist.
Chroma: 1 through 4, dry or moist.
Texture: Very gravelly sandy loam, very gravelly fine sandy loam, or very gravelly coarse sandy loam.
Rock fragments: 35 to 60 percent.
Structure: Weak or moderate, very fine to medium subangular blocky or massive.
Consistence: Soft to hard, dry.
Secondary calcium carbonates: Occur throughout the matrix or as coats on rock fragments.
Reaction: Moderately alkaline or strongly alkaline.
Calcium carbonate equivalent: 5 to 40 percent.
Salinity (EC): 0 to 2 mmhos/cm.
Sodicity (SAR): 0 to 13.
Effervescence: Strongly effervescent or violently effervescent.
Calcium carbonate equivalent: 5 to 30 percent.
Bqkm horizon - Cementation class: Indurated within the upper 6 inches and strongly cemented below 6 inches.
C horizon - Texture: Gravelly sandy loam, very gravelly sandy loam, very gravelly loamy sand, or extremely gravelly loamy coarse sand.
COMPETING SERIES: These are the Boger, Gravden, Gunnel, Karpp, Lien, and Rekima series. Boger soils have lithic contacts between 18 and 30 inches. Gravden soils have fine-earth textures of loam and silt loam and average 60 to 85 percent rock fragments in the particle-size control section. Gunnel soils have duripans that are indurated for a thickness of more than 6 inches. Karpp soils have 18 to 25 percent clay in the particle-size control section. Lien soils have duripans at depths of 6 to 14 inches. Rekima soils have cambic horizons, do not have calcic horizons, and have lithic contacts between 17 to 20 inches.
GEOGRAPHIC SETTING: Jericho soils are on fan remnants and ballenas. These soils formed in alluvium derived mainly from igneous rocks, but includes some sedimentary rocks. Slopes are 2 to 50 percent. Areas with slopes over 15 percent are the result of faulting subsequent to the formation of the duripan. Elevations range from 4,600 to 7,600 feet. The climate is semiarid continental. The mean annual precipitation is 8 to 14 inches. The mean annual temperature is 45 to 52 degrees F. and the mean summer temperature is 60 to 64 degrees F. The frost-free period is 100 to 140 days.
GEOGRAPHICALLY ASSOCIATED SOILS: These are the Truesdale, Sierocliff, Deerlodge, Medburn, Wales, and Doyce soils. Medburn, Wales, and Doyce soils are very deep. Sierocliff and Deerlodge are moderately deep to petrocalcic horizons and duripans, respectively. Truesdale soils are coarse-loamy, moderately deep to duripans, and have cambic horizons and calcic horizons.
DRAINAGE AND PERMEABILITY: Well drained; very high surface runoff; moderate or moderately rapid permeability above the duripan and moderately rapid to very rapid permeability below the duripan.
USE AND VEGETATION: Jericho soils are used for rangeland. The potential vegetation is black sagebrush, bluebunch wheatgrass, bottlebrush squirreltail, and Indian ricegrass.
DISTRIBUTION AND EXTENT: Western Utah and eastern Nevada. These soils are extensive with about 135,000 acres of the series mapped to date. MLRAs 25, 28A, and 28B.
MLRA OFFICE RESPONSIBLE: Reno, Nevada.
SERIES ESTABLISHED: Juab County (Fairfield-Nephi Area), Utah, 1980.
REMARKS: Diagnostic horizons and features recognized in this pedon are:
Ochric epipedon - The zone from the soil surface to 5 inches. (A horizon)
Calcic horizon - The zone 9 to 19 inches. (Bk and Bkq horizons)
Duripan - The zone from 19 to 30 inches with an indurated laminar cap. (Bqkm horizon)
Particle size control section - The zone from 10 to 19 inches (Bkq horizon and part of the Bk horizon).