LOCATION PANTAK                  AZ+TX

Established Series
Rev. DJB
10/2014

PANTAK SERIES

The Pantak series consists of very shallow and shallow, well drained soils formed in mixed slope alluvium, colluvium, and residuum from igneous rock. Pantak soils are on pediments, hills and mountains with slopes of 5 to 60 percent. The mean annual precipitation is about 14 inches (356 cm). The mean annual air temperature is about 62 degrees F (17 degrees C).

TAXONOMIC CLASS: Loamy-skeletal, mixed, superactive, thermic Lithic Ustic Haplargids

TYPICAL PEDON: Pantak very gravelly sandy loam - rangeland. (Colors are for dry soil unless otherwise noted.)
A--0 to 1 inch (0 to 3 cm); brown (10YR 4/3) very gravelly sandy loam, very dark grayish brown (10YR 3/2) moist; weak fine granular structure; soft, very friable, nonsticky and nonplastic; common fine roots; common fine interstitial pores; 40 percent gravel; noneffervescent; moderately acid (pH 6.0); abrupt wavy boundary. (1 to 3 inches or 3 to 8 cm thick)
AB--1 to 4 inches (3 to 10 cm); brown (10YR 5/3) very gravelly sandy loam, dark brown (10YR 3/3) moist; weak fine subangular blocky structure; soft, very friable, nonsticky and nonplastic; common fine and medium roots; common fine tubular pores; 45 percent gravel; noneffervescent; moderately acid (pH 6.0); abrupt wavy boundary. (2 to 5 inches thick 5 to 13 cm)
Bt--4 to 14 inches (10 to 36 cm); yellowish brown (10YR 5/4) very gravelly sandy clay loam, dark yellowish brown (10YR 3/4) moist; weak fine subangular blocky structure; soft, very friable, sticky and plastic; common fine and medium roots; common fine tubular pores; common distinct continuous clay films on rock fragments; 50 percent gravel; noneffervescent; moderately acid (pH 6.0); abrupt wavy boundary. (4 to 16 inches or 10 to 41 cm thick)
R--14 inches (36 cm); andesite.

TYPE LOCATION: Pima County, Arizona; latitude of 31 degrees, 48 minutes, 50 seconds North and a longitude of 111 degrees, 35 minutes, 00 seconds West.

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. The epipedon is moist in some part less than 90 days (cumulative) when the soil temperature is above 41 degrees F (5 degrees C) in 7 out of 10 years. Ustic aridic soil moisture regime.

Soil temperature: 61 to 69 degrees F.

Particle-Size Control Section (weighted average):
Clay Content: 20 to 35 percent
Rock Fragments: 35 to 75 percent
Depth to Bedrock: 4 to 20 inches
Reaction: moderately acid to slightly alkaline
Calcium Carbonate: present in bedrock fractures
Organic Matter: 1 to 3 percent

A horizon
Hue: 7.5YR, 10YR
Value: 3 to 5 dry, 2 to 4 moist
Chroma: 1 to 4, dry or moist

Bt horizon
Hue: 7.5YR, 10YR
Value: 2 to 5 dry, 2 to 4 moist
Chroma: 1 to 4, dry or moist
Texture: clay loam, sandy clay loam, loam

COMPETING SERIES: This is the Barten (I)(AZ) series. The Barten series is inactive.

GEOGRAPHIC SETTING: The Pantak soils are on pediments, hills and mountains. Slope ranges from 5 to 60 percent. They formed in mixed slope alluvium, colluvium, and residuum from andesite and related igneous rock. Elevation ranges from 2,500 to 5,600 feet (762 to 1,707 meters). The mean annual precipitation is 12 to 16 inches (305 to 406 mm). The mean annual air temperature ranges from 57 to 67 degrees F (13.9 to 19.4 degrees C). The frost-free period is about 170 to 250 days.

GEOGRAPHICALLY ASSOCIATED SOILS: These are the Lampshire, Romero, Chiricahua, and Oracle soils. Lampshire, and Romero soils do not have argillic horizons. Chiricahua soils are clayey. Oracle soils are loamy.

DRAINAGE AND PERMEABILITY: Well drained; medium to rapid runoff; moderate permeability.

USE AND VEGETATION: Pantak soils are used for livestock grazing and wildlife habitat. Vegetation includes sideoats grama, cane bluestem, curly mesquite, Schott agave, prickly pear, snakeweed, and mesquite.

DISTRIBUTION AND EXTENT: Southern and Central Arizona and West Texas. This series is of moderate extent. MLRA 38, 41, and 42.

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

SERIES ESTABLISHED: Pima County, Arizona; Soil survey of the Tohono O'odham Nation, AZ, Parts of Maricopa, Pima and Pinal Counties; 1993. Pantak is a village on the Tohono O'odham Nation.

REMARKS: Diagnostic horizons and features recognized in this pedon are:
Ochric epipedon - the zone from 0 to 4 inches (0 to 10 cm)(A horizon)
Argillic horizon - the zone from 4 to 14 inches (10 to 36 cm) (Bt horizon)
Lithic contact - the boundary at 14 inches (36 cm) (R horizon)

Soil classified according to Soil Taxonomy, Second Edition, 1999; Keys to Soil Taxonomy, 12th Edition, 2014

Update and revisions for Recorrelation of Brewster County, Texas, Main Part, 2/12/08, CEM
Revised for the correlation of AZ661, 2/2009, WWJ
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 Hudspeth County, Texas (Main Part) and Culberson County, Texas (Main Part); July, 2012, NMS
Revised for the correlation of Presidio County, Texas ; Oct, 2012, WWJ
Revised for the correlation the SDJR - MLRA 38 - Pantak-Rock outcrop-Lampshire complex, 5 to 60 percent slopes project, September 2013, LJG2

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National Cooperative Soil Survey
U.S.A.