LOCATION BEAUMAIN                AZ

Established Series
Rev. JFW/RFG
10/2013

BEAUMAIN SERIES

The Beaumain series consists of shallow and very shallow, well drained soils formed in slope alluvium and residuum from basic igneous rock. Beaumain soils are on hills and mountains and have slopes of 5 to 60 percent. Mean annual precipitation is about 18 inches (457 mm) and the mean annual air temperature is about 60 degrees F (16 degrees C).

TAXONOMIC CLASS: Clayey-skeletal, smectitic, thermic Aridic Lithic Argiustolls

TYPICAL PEDON: Beaumain very cobbly clay loam - rangeland. (Colors are for dry soil unless otherwise noted.) Ninety-five percent of the surface is covered with gravel, cobbles, and stones.
A--0 to 2 inches (0 to 3 cm); brown (7.5YR 4/3) very cobbly clay loam, dark brown (7.5YR 3/3) moist; moderate fine and medium subangular blocky structure; loose, soft, slightly sticky and nonplastic; common fine and many very fine roots; many very fine and few medium pores; 25 percent gravel, 20 percent cobbles, and 2 percent stones; slightly alkaline (pH 7.7); abrupt wavy boundary. (1 to 4 inches or 3 to 10 cm thick)
Bt--2 to 8 inches (3 to 20 cm); dark brown (7.5YR 3/2) very cobbly clay, dark reddish brown (5YR 3/2) moist; weak fine and medium subangular blocky structure; very friable, moderately hard, very sticky and very plastic; many very fine and fine and few medium roots; many very fine and common medium pores; many distinct clay films on rock fragments and surfaces of root channels, and many distinct clay bridges between sand grains; 20 percent gravel, 25 percent cobbles; slightly alkaline (pH 7.5); clear irregular boundary. (5 to 16 inches or 13 to 41 cm thick)
Crt--8 to 10 inches; slightly weathered andesite; few clay films along fractures of bedrock. (0 to 2 inches thick)
R--10 inches (25 cm) ; andesite bedrock.

TYPE LOCATION: Graham County, Arizona on the San Carlos Indian Reservation; 33 18' 09.54" North Latitude, 110 04' 15.37" West Longitude. About 2,550 feet south and 425 feet west of the northeast corner of Section 34, T. 1 S., R. 22 E. Approximately 3.5 miles south of Hwy 1000, 150 feet west of Road 200.

RANGE IN CHARACTERISTICS:
Soil moisture - Intermittently moist in some part of the soil moisture control section during July-September and December-March. Driest during May and June. Aridic ustic soil moisture regime.

Soil temperature - 59 to 67 degrees F (15 to 19.4 degrees C).

Rock fragments - Averages 35 to 75 percent in the particle size control section. May have as much as 95 percent gravel, cobble, and stones on the surface

Depth to bedrock: 4 to 20 inches (10 to 51 cm)

Organic matter: 1 to 3 percent

Average percent clay in control section: 35 to 50 percent

A horizon
Hue: 7.5YR, 10YR, 5YR
Value: 3 to 5 dry, 2 or 3 moist
Chroma: 2 or 3 dry, 1 to 3 moist
Texture: clay loam, loam, sandy clay loam
Rock fragments: 35 to 75 percent
Reaction: neutral to moderately alkaline

Bt horizon
Hue: 5 YR, 7.5YR
Value: 3 to 5 dry, 2 to 5 moist
Chroma: 2 to 6 dry, 1 to 6 moist
Texture: clay, clay loam, sandy clay
Clay content: 35 to 50 percent
Rock fragments: 35 to 75 percent
Reaction: neutral to moderately alkaline

COMPETING SERIES: This is the Mainstay (TX) series. Mainstay soils have 50 to 70 percent clay in the control section.

GEOGRAPHIC SETTING: Beaumain soils are on hills and mountains at elevations of 3,600 feet to 6,500 feet (1098 to 1981 meters). Slopes are dominantly 15 to 45 percent and range from 5 to 60 percent. The Beaumain soils formed in slope alluvium and residuum from basalt, andesite, rhyolite, tuff and other extrusive igneous rocks. The mean annual air temperature is 57 to 65 degrees F (14 to 18.3 degree C). Mean annual precipitation ranges from 16 to 20 inches ( 406 to 508 mm) and occurs mainly as thundershowers in July and August and rains in December and January. The frost-free period is 150 to 210 days.

GEOGRAPHICALLY ASSOCIATED SOILS: These are the Kuykendall, Cherrycow and Cloverdale soils. Kuykendall, Cherrycow and Cloverdale soils have less than 35 percent rock fragments and Cherrycow and Cloverdale soils are also deeper than 20 inches.

DRAINAGE AND PERMEABILITY: Well-drained; medium to rapid runoff; very slow or slow permeability.

USE AND VEGETATION: Used for livestock grazing and wildlife habitat. The vegetation is sideoats grama, curly mesquite, red brome, broom snakeweed, bear grass, turbinella oak, pinyon, prickly pear, annual grasses, catclaw acacia, and occasional juniper and mesquite.

DISTRIBUTION AND EXTENT: Central Arizona. Beaumain soils are of moderate extent. MLRA is 38 & 41.

MLRA SOIL SURVEY REGIONAL OFFICE (MO) RESPONSIBLE: Phoenix, Arizona

SERIES ESTABLISHED: Gila County, Arizona; Soil Survey of Eastern Pinal and Southern Gila Counties, Arizona, 2008.

REMARKS: Diagnostic horizons and features recognized in this pedon are:

Mollic epipedon - the zone from 0 to 8 inches (0 to 20 cm) (A and Bt horizons)

Argillic horizon - the zone from 2 to 8 inches (5 to 20 cm) (Bt horizon)

Lithic contact - the boundary at 10 inches (25 cm) (R horizon)

Classified according to Soil Taxonomy, Second Edition, 1999; Keys to Soil Taxonomy, Eleventh Edition, 2010.

Updated competing series section, 4/10/08, CEM

Revised for the correlation of AZ661, 11/08, PDC

Revised for the correlation of AZ675, 5/2009, WWJ

Revised for the correlation of Graham County, AZ, Southwestern Part; March, 2011, WWJ
Revised for the correlation of the SDJR - MLRA 38 - Beaumain-Rock outcrop-Cherrycow complex, 5 to 60 percent slopes MLRA 38 project, September 2013, LJG2

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National Cooperative Soil Survey
U.S.A.