LOCATION PINALENO AZ+NMEstablished Series
TAXONOMIC CLASS: Loamy-skeletal, mixed, superactive, thermic Typic Calciargids
TYPICAL PEDON: Pinaleno very gravelly clay loam - rangeland. (Colors are for dry soil unless otherwise noted.)
A--0 to 1 inch; yellowish red (5YR 5/6) very gravelly clay loam, reddish brown (5YR 4/4) moist; weak thick platy structure; soft, very friable, slightly sticky and slightly plastic; common very fine roots; common very fine interstitial pores; 40 percent subrounded gravel and 5 percent cobble; noneffervescent; moderately alkaline; clear smooth boundary. (1 to 3 inches thick)
Bt--1 to 5 inches; yellowish red (5YR 5/6) gravelly clay loam, reddish brown (5YR 4/4) moist; weak fine granular structure; slightly hard, very friable, moderately sticky and moderately plastic; common very fine roots; common very fine interstitial pores; 40 percent subrounded gravel and 5 percent cobble; noneffervescent; moderately alkaline; clear smooth boundary. (3 to 6 inches thick)
Btk1--5 to 12 inches; yellowish red (5YR 5/6) very gravelly clay loam, reddish brown (5YR 4/4) moist; moderate medium subangular blocky structure; slightly hard, very friable, sticky and plastic; common very fine roots; common very fine tubular pores; common distinct clay films on faces of peds; 55 percent gravel; strongly effervescent; common calcium carbonate filaments; moderately alkaline; gradual wavy boundary. (3 to 31 inches thick)
Btk2--12 to 24 inches; light brown (7.5YR 6/4) very gravelly loam, brown (7.5YR 5/4) moist; moderate medium subangular blocky structure; slightly hard, very friable, slightly sticky and slightly plastic; common very fine roots; common very fine tubular pores; few distinct clay films lining pores and on faces of peds; 35 percent gravel; violently effervescent; many soft calcium carbonate masses; moderately alkaline; gradual wavy boundary. (12 to 20 inches thick)
C--24 to 60 inches; light brown (7.5YR 6/4) loam, brown (7.5YR 5/4) moist; massive; soft, very friable, slightly sticky and slightly plastic; common very fine interstitial pores; violently effervescent; moderately alkaline.
TYPE LOCATION: Maricopa County, Arizona; 2,400 feet west and 330 feet south of the northeast corner of section 1, T. 6 N., R. 8 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. Typic aridic soil moisture regime.
Rock fragments: Averages 35 to 70 percent gravel and cobble in the control section
Soil temperature: 59 to 72 degrees F.
Thickness of solum: 15 to 40 inches
Depth to calcic horizon: 5 to 40 inches
A horizon
Hue: 5YR, 7.5YR, 10YR
Value: 4 through 7 dry, 3 through 6 moist
Chroma: 2 through 6, dry or moist
Organic matter: less than 1 percent
Bt horizons
Hue: 2.5YR, 5YR, 7.5YR
Value: 4 through 7 dry, 3 through 7 moist
Chroma: 3 or 6, dry or moist
Texture: sandy clay loam, clay loam, loam (18 to 35 percent clay)
Calcium carbonate: upper part noncalcareous; lower part more than 15 percent calcium carbonate equivalent
Bk or C horizon
Hue: 7.5YR, 5YR
Value: 5 through 8 dry, 4 through 7 moist
Chroma: 2 through 4 dry, 2 through 6 moist
Texture: sandy clay loam, loam, sandy loam, loamy sand (10 to 25 percent clay)
Calcium carbonate: 8 to 25 percent or more calcium carbonate equivalent
COMPETING SERIES: This is the Oldwoman (T)(CA) series. Oldwoman soils have durinodes and less than 18 percent clay in the control section.
GEOGRAPHIC SETTING: Pinaleno soils are on fan terraces and stream terraces. Slopes range from 0 to 45 percent. Elevations range from 1,500 to 5,400 feet. They formed in mixed alluvium. Mean annual air temperature is 58 to 70 degrees F. Mean annual precipitation is 8 to 12 inches and falls as rain mainly in July and August and much of the remainder in December, January, and February. The frost-free period is 180 to 280 days.
GEOGRAPHICALLY ASSOCIATED SOILS: These are the Anthony, Queencreek, Brazito, Continental, and Gila soils. Queencreek soils are sandy-skeletal. Continental, Gila, Anthony, and Brazito soils are not skeletal.
DRAINAGE AND PERMEABILITY: Well drained; slow to medium runoff; moderately slow permeability.
USE AND VEGETATION: Used for livestock grazing. Vegetation is a sparse cover of creosotebush, cacti, mesquite, sixweeks grama and annuals.
DISTRIBUTION AND EXTENT: Southern Arizona and southwestern New Mexico. MLRAs 40, 41, 42. The Pinaleno soils are moderately extensive.
MLRA OFFICE RESPONSIBLE: Phoenix, Arizona
SERIES ESTABLISHED: Eastern Maricopa-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 24 inches (Bt, Btk1, Btk2 horizons)
Calcic horizon - the zone from 12 to 24 inches (Btk2 horizon)
Classified according to Soil Taxonomy, Second Edition, 1999; Keys to Soil Taxonomy, Tenth Edition, 2006.
The classification was changed from loamy-skeletal, mixed, superactive, thermic Typic Haplargids to loamy-skeletal, mixed, superactive, thermic Typic Calciargids in 2003 due to changes in soil classification
ADDITIONAL DATA: NSSL S77AZ009004 S60NM013009 S66NM013016 S67NM013004 S67NM013005