LOCATION BARTMUS AZEstablished Series
TAXONOMIC CLASS: Loamy-skeletal, mixed, superactive, thermic, shallow Ustic Haplodurids
TYPICAL PEDON: Bartmus very gravelly sandy loam - rangeland. (Colors are for dry soil unless otherwise noted.)
A--0 to 2 inches; pale brown (10YR 6/3) very gravelly sandy loam, brown (10YR 5/3) moist; moderate thin platy structure; soft, very friable, slightly sticky and slightly plastic; common fine roots; common very fine irregular pores; 40 percent gravel and 10 percent cobble; slightly effervescent; slightly alkaline (pH 7.6); abrupt smooth boundary. (1 to 3 inches thick)
Bw--2 to 6 inches; brown (10YR 5/3) very gravelly sandy clay loam, brown (10YR 4/3) moist; weak fine subangular blocky structure; soft, very friable, slightly sticky and moderately plastic; common fine roots; common very fine tubular pores; 40 percent gravel; strongly effervescent; slightly alkaline (pH 7.6); abrupt smooth boundary. (4 to 14 inches thick)
2Bkqm--6 to 19 inches; indurated hardpan with fractured thick laminar cap. (2 to 13 inches thick)
3R--19 inches; rhyolite.
TYPE LOCATION: Mohave County, Arizona. Located at a latitude of 35 degrees, 06 minutes, 11 seconds North and a longitude of 113 degrees, 32 minutes, 01 seconds west; 1100 feet east and 550 feet south of the northwest corner of section 15, T. 20 N., R. 12 W.
RANGE IN CHARACTERISTICS:
Soil moisture: Intermittently moist in some part of the soil moisture control section during July-September and December-February. Driest during May and June. Ustic aridic soil moisture regime.
Depth to duripan: 5 to 18 inches
Depth to bedrock: 7 to 30 inches
Effervescence: slight to violent
Rock fragments: 35 to 75 percent gravel
Soil temperature: 59 to 63 degrees F.
A horizon
Hue: 7.5YR, 10YR
Value: 4 through 6 dry, 4 or 5 moist
Chroma: 3 or 4, dry or moist
Reaction: neutral or slightly alkaline
Bw horizon
Hue: 7.5YR, 10YR
Value: 4 or 5, dry or moist
Chroma: 3 or 4, dry or moist
Texture: sandy loam, loam, sandy clay loam (15 to 25 percent clay)
Reaction: neutral or slightly alkaline
COMPETING SERIES: This is the Bigtoe (T) (AZ) Series. Bigtoe soils have a calcic horizon above the duripan.
GEOGRAPHIC SETTING: Bartmus soils are on mesas at elevations of 4,000 to 4,200 feet. Slopes range from 2 to 15 percent. These soils formed in alluvium from volcanic rock. The mean annual precipitation is 12 to 16 inches. The mean annual air temperature is 57 to 61 degrees F. The frost-free period is 180 to 210 days.
GEOGRAPHICALLY ASSOCIATED SOILS: These are the Chiricahua, Gonzales, Lampshire, Penthouse and Romero soils. Chiricahua and Romero soils are shallow to a paralithic contact. Gonzales and Lampshire soils are less than 20 inches deep to a lithic contact. Penthouse soils are very deep.
DRAINAGE AND PERMEABILITY: Well drained; medium or very high runoff; moderate permeability.
USE AND VEGETATION: Used for livestock grazing and wildlife habitat. Vegetation includes black grama, sideoats grama, needleandthread, range ratany, desert ceanothus and turbinella oak.
DISTRIBUTION AND EXTENT: Northwestern Arizona. This series is of small extent. MLRA is 38. The name is from a local ranch.
MLRA SOIL SURVEY REGIONAL OFFICE (MO) RESPONSIBLE: Phoenix, Arizona
SERIES ESTABLISHED: Mohave County, Arizona; Soil survey of Mohave County, Arizona, Southern Part; 2005.
REMARKS: Diagnostic horizons and features recognized in this pedon are:
Ochric epipedon - The zone from 0 to 2 inches (A horizon)
Duripan - The zone from 6 to 19 inches (2Bkqm horizon)
Lithic contact - The boundary at 19 inches (3R horizon)
Classified according to Keys to Soil Taxonomy Ninth Edition, 2003.