LOCATION TREMANT AZEstablished Series
TAXONOMIC CLASS: Fine-loamy, mixed, superactive, hyperthermic Typic Calciargids
TYPICAL PEDON: Tremant very gravelly loam - rangeland. (Colors are for dry soil unless otherwise noted.)
A--0 to 1 inch; light brown (7.5YR 6/4) very gravelly loam, brown (7.5YR 5/4) moist; weak medium platy structure; slightly hard, friable, slightly sticky and slightly plastic; many fine roots; common fine vesicular pores; 50 percent subangular gravel; moderately alkaline (pH 8.0); abrupt smooth boundary. (1/2 to 5 inches thick)
Bt1--1 to 8 inches; reddish brown (5YR 5/4) clay loam, reddish brown (5YR 5/4) moist; weak very fine subangular blocky structure; slightly hard, very friable, moderately sticky and moderately plastic; many fine roots; few fine tubular pores; few faint clay films on faces of peds; 5 percent gravel; slightly effervescent; moderately alkaline (pH 8.0); abrupt smooth boundary. (2 to 10 inches thick)
Bt2--8 to 14 inches; reddish brown (5YR 5/4) gravelly clay loam, reddish brown (5YR 4/4) moist; weak fine subangular blocky structure; slightly hard, friable, slightly sticky and slightly plastic; common fine roots; many fine irregular pores; common faint clay films on faces of peds; 20 percent gravel; violently effervescent; many fine calcium carbonate filaments; moderately alkaline (pH 8.2); clear smooth boundary. (3 to 10 inches thick)
Btk--14 to 23 inches; yellowish red (5YR 5/8) and pink (7.5YR 7/4) gravelly clay loam, reddish brown (5YR 4/4) and reddish yellow (7.5YR 6/6) moist; weak fine subangular blocky structure; hard friable, slightly sticky and slightly plastic; few fine roots; common very fine tubular pores; few faint clay films on faces of peds; 30 percent gravel; violently effervescent; many coarse irregular calcium carbonate masses; moderately alkaline (pH 8.2); clear wavy boundary. (3 to 15 inches thick)
Bk1--23 to 36 inches; reddish yellow (7.5YR 7/6) and pink (5YR 7/4) gravelly loam, strong brown (7.5YR 5/6) moist; massive; very hard, firm, slightly sticky and slightly plastic; few fine roots; few fine tubular pores; very few faint clay films in pores; 25 percent gravel; violently effervescent; many coarse irregular calcium carbonate masses; moderately alkaline (pH 8.2); clear smooth boundary. (4 to 14 inches thick)
Bk2--36 to 60 inches; pink (7.5YR 7/4) gravelly loam, light brown (7.5YR 6/4) moist; massive; slightly hard, friable, slightly sticky and slightly plastic; common fine tubular pores; 30 percent gravel; violently effervescent; many coarse calcium carbonate masses and concretions; moderately alkaline (pH 8.2).
TYPE LOCATION: Maricopa County, Arizona; 1250 feet west and 1120 feet
south of the northeast corner of section 23, T. 4 N., R. 2 W. Latitude of 33 degrees, 40 minutes, 45 seconds N., Longitude of 112 degrees, 25 minutes, 49 seconds W., NAD 83.
RANGE IN CHARACTERISTICS:
Solum thickness - 24 to 60 inches or more
Rock fragments - 15 to 35 percent (average for control section); mostly gravel, but some pedons have as much as 15 percent cobbles
Depth to calcic horizon - 14 to 30 inches; 15 to 60 percent calcium carbonate equivalent in any one horizon
Organic matter content - Less than 1 percent
Reaction - slightly or moderately alkaline
Salinity- usually less than 2 dS/m, but ranges to 15
A horizon
Hue: 5YR, 7.5YR, 10YR
Value: 5, 6 or 7 dry, 4 or 5 moist
Chroma: 2, 3 or 4, dry or moist
Texture: fine sandy loam, sandy loam, loam, clay loam
E horizon
Occurs as a 1 to 3 inch thick horizon in some pedons
Bt horizon
Hue: 5YR, 7.5YR
Value: 4, 5 or 6, dry or moist
Chroma: 3, 4, 5, 6 or 8 dry, 4, 5 or 6 moist
Texture: loam, sandy clay loam, clay loam (averages 18 to 35 percent clay) can be sandy loam in the lower part
Bk horizon
Hue: 5YR, 7.5YR
Value: 4, 5, 6, 7 or 8 dry, 4, 5 or 6 moist
Chroma: 3, 4, 6 or 8 dry, 3, 4 or 6 moist
Texture: Loam, clay loam, sandy loam, sandy clay loam
Cementation: Usually noncemented; is weakly cemented in some pedons
COMPETING SERIES: These are the Harqua (AZ), Mohall (AZ), Snaggletooth (T) (CA), Orita (CA), and Tucson (AZ) series. Harqua soils have strongly saline argillic horizons. Mohall, Snaggletooth, and Tucson soils average less than 15 percent rock fragments. Orita soils have buried A and B horizons. Snaggletooth soils are in the Colorado Desert of southeastern California (MLRA 31) and are moist in some part for short periods during winter and early spring.
GEOGRAPHIC SETTING: Tremant soils are on fan terraces, stream terraces or relict basin floors. Slopes are 0 to 5 percent. Elevations are 400 to 2500 feet. These soils formed in fan and stream alluvium from mixed sources and eolian sediments. The climate is hot, arid continental. The mean annual precipitation ranges from 2 to 10 inches. The mean annual air temperature ranges from 67 to 76 degrees F. The frost-free period is 260 to 325 days.
GEOGRAPHICALLY ASSOCIATED SOILS: These are the Antho, Contine, Gilman, and Rillito soils. Antho and Gilman soils are slightly lower on the landscape and do not have argillic horizons. Contine soils are on adjacent landscapes and are fine textured. Laveen and Rillito soils are adjacent and do not have argillic horizons.
DRAINAGE AND PERMEABILITY: Well drained; medium runoff; moderately slow permeability.
USE AND VEGETATION: Used almost entirely for livestock grazing and wildlife habitat. Vegetation is mesquite, creosotebush, bursage, cacti, and scattered paloverde. Irrigated areas are planted to cotton, alfalfa, sorghum, safflower, sugar beets, and barley.
DISTRIBUTION AND EXTENT: Southern Arizona. The series is extensive. Total extent is about 180,000 acres. MLRA is 40.
MLRA SOIL SURVEY REGIONAL OFFICE (MO) RESPONSIBLE: Phoenix, Arizona
SERIES ESTABLISHED: Maricopa County, Arizona; Soil survey of Eastern Maricopa and Northern Pinal Counties Area, Arizona; 1971.
REMARKS: Diagnostic horizons and features recognized in this pedon are:
Ochric epipedon - the zone from 0 to 1 inch (A horizon)
Argillic horizon - the zone from 1 to 23 inches (Bt1, Bt2, Btk horizons)
Calcic horizon - the zone from 14 to 60 inches (Btk, Bk1, Bk2 horizons)
Classified according to Soil Taxonomy, Second Edition, 1999; Keys to Soil Taxonomy, Tenth Edition, 2006.