LOCATION TENNECO                 AZ+TX

Established Series
Rev. DJB
10/2012

TENNECO SERIES

The series consists of very deep, well drained soils that formed in mixed fan alluvium. Tenneco soils are on flood plains and alluvial fans. Slopes range from 0 to 5 percent. The mean annual precipitation is about 14 inches and the mean annual air temperature is about 64 degrees F.

TAXONOMIC CLASS: Fine-loamy, mixed, superactive, thermic Ustic Haplocambids

TYPICAL PEDON: Tenneco fine sandy loam - rangeland. (Colors are for dry soil unless otherwise noted.)

Ap--0 to 2 inches; yellowish brown (10YR 5/4) fine sandy loam, dark yellowish brown (10YR 3/4) moist; weak thin platy structure; soft, very friable, nonsticky and nonplastic; common very fine and fine roots; few fine irregular pores; noneffervescent; slightly alkaline (pH 7.8); abrupt smooth boundary. (2 to 5 inches thick)

Bw--2 to 11 inches; dark yellowish brown (10YR 4/4) loam, dark yellowish brown (10YR 3/4) moist; weak fine subangular blocky structure; soft, very friable, moderately sticky and moderately plastic; many very fine and fine roots; few fine irregular and tubular pores; common distinct organic coatings on ped faces; noneffervescent; slightly alkaline (pH 7.8); abrupt wavy boundary. (6 to 13 inches thick)

Bk1--11 to 26 inches; dark yellowish brown (10YR 4/4) loam, dark yellowish brown (10YR 3/4) moist; weak fine subangular blocky structure; soft, very friable, moderately sticky and moderately plastic; many very fine and fine roots; few fine irregular and tubular pores; many fine calcium carbonate filaments; strongly effervescent, 6 percent calcium carbonate equivalent; moderately alkaline (pH 8.0); clear smooth boundary.

Bk2--26 to 41 inches; light yellowish brown (10YR 6/4) loam, yellowish brown (10YR 5/4) moist; massive; slightly hard, very friable, slightly sticky and moderately plastic; few very fine and fine roots; few fine irregular and tubular pores; many fine calcium carbonate filaments; violently effervescent, 5 percent calcium carbonate equivalent; moderately alkaline (pH 8.0); clear smooth boundary.

C--41 to 60 inches; light yellowish brown (10YR 6/4) sandy loam, dark yellowish brown (10YR 4/4) moist; massive; soft, very friable, nonsticky and nonplastic; few fine irregular pores; disseminated calcium carbonate; violently effervescent, 7 percent calcium carbonate equivalent; moderately alkaline (pH 8.0). (Combined thickness of the Bk and C horizons is 40 to 50 inches)

TYPE LOCATION: Cochise County, Arizona; located at a latitude of 31 degrees, 23 minutes, 30 seconds North and longitude of 110 degrees, 08 minutes, 01 seconds West; about 400 feet north and 500 feet east from the southwest corner of Section 29, T. 23 S., R. 22 E.

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.

Soil Temperature: 62 to 69 degrees F.

Reaction: slightly to moderately alkaline

Clay content: 18 to 35 percent in the control section

Calcium carbonate equivalent: 3 to 15 percent

A horizon
Hue: 10YR, 7.5YR
Value: 4 to 6 dry, 2 to 5 moist
Chroma: 2 to 4, dry or moist

Bw horizon
Hue: 10YR, 7.5YR
Value: 4 to 6 dry, 2 to 5 moist
Chroma: 2 to 4, dry or moist
Texture: loam, sandy clay loam, sandy loam, clay loam, silt loam

Bk and C horizons
Hue: 10YR, 7.5YR
Value: 4 to 7 dry, 2 to 8 moist
Chroma: 1 to 6, dry or moist
Texture: sandy loam, loam, sandy clay loam, clay loam

COMPETING SERIES: These are the Double (NM), Hooks (AZ), and LaLande (NM) series. Double soils have mean annual soil temperatures of 59 to 62 degrees F. Hooks soils are noneffervescent throughout. LaLande soils are in the Great Plains and are moist in the soil moisture control section in May and June.

GEOGRAPHIC SETTING: Tenneco soils are on flood plains and alluvial fans at elevations of 2,900 to 5,500 feet. Slopes range from 0 to 5 percent. These soils formed in mixed fan alluvium. The mean annual precipitation is 12 to 16 inches and occurs as thunderstorms during July to September and as gentle rains during December to February. The mean annual air temperature is 60 to 67 degrees F. The frost-free period is 180 to 250 days.

GEOGRAPHICALLY ASSOCIATED SOILS: These are the Sasabe, Vana, Moco, Courtland and Diaspar. The Sasabe, Courtland and Diaspar soils have argillic horizons. Vana soils have a petrocalcic horizon. Moco soils have gypsic mineralogy.

DRAINAGE AND PERMEABILITY: Well drained; slow runoff; moderate to moderately slow permeability. Subject to flooding.

USE AND VEGETATION: Used for livestock grazing and wildlife habitat. Vegetation includes Lehmann lovegrass, blue grama, vine mesquite, cane beardgrass, tobosa, and mesquite.

DISTRIBUTION AND EXTENT: Southern Arizona and West Texas. MLRAs 41 and 42. Tenneco soils are of moderate extent.

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

SERIES ESTABLISHED: Cochise County, Arizona. Soil survey of Cochise County, Arizona, Douglas - Tombstone Part; 1996.

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

Ochric epipedon - the zone from 0 to 2 inches (Ap horizon)

Cambic horizon - the zone from 2 to 11 inches (Bw horizon)

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

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 Black Hills-Sedona, AZ, August 2012, CEM

Revised for the correlation of Presidio County, Texas ; Oct, 2012, WWJ

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National Cooperative Soil Survey
U.S.A.