LOCATION AKINVILLE               AZ

Established Series
Rev. AAD/DEW/PDC/ET
04/2015

AKINVILLE SERIES

The Akinville series consists of very deep, somewhat excessively drained soils that formed in mixed alluvium and colluvium derived from sedimentary formations high in gypsum and calcium carbonate. Akinville soils are on fan terraces and have slopes of 2 to 20 percent. The mean annual precipitation is about 10 inches and the mean annual air temperature is about 64 degrees F.

TAXONOMIC CLASS: Loamy-skeletal, gypsic, thermic Typic Calcigypsids

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

A--0 to 2 inches; brown (7.5YR 5/4) very gravelly fine sandy loam, dark brown (7.5YR 4/4) moist; weak thin platy structure; soft, very friable, nonsticky and nonplastic; common fine and very fine roots; common fine vesicular and few very fine tubular pores; 50 percent gravel and 10 percent cobble; slightly effervescent, 11 percent calcium carbonate equivalent; moderately alkaline (pH 8.4); abrupt smooth boundary. (1 to 2 inches thick)

Bk1--2 to 10 inches; light brown (7.5YR 6/4) very gravelly loam, dark brown (7.5YR 4/4) moist; weak fine and medium subangular blocky structure; slightly hard, friable, slightly sticky and nonplastic; common fine and very fine roots; common fine and very fine tubular and interstitial pores; 30 percent gravel and 10 percent cobble; strongly effervescent with calcium carbonate segregated as few fine irregular soft masses, seams, and pendants on rock fragments, 18 percent calcium carbonate equivalent; strongly alkaline (pH 8.6); clear smooth boundary. (5 to 15 inches thick)

Bk2--10 to 18 inches; light brown (7.5YR 6/4) very gravelly loam, brown (7.5YR 5/4) moist; weak medium subangular blocky structure; slightly hard, friable, slightly sticky and slightly plastic; common fine and very fine roots; common fine and very fine tubular and interstitial pores; 30 percent gravel and 10 percent cobble; violently effervescent with calcium carbonate segregated as common fine irregular soft masses, seams, and pendants on rock fragments, 23 percent calcium carbonate equivalent; strongly alkaline (pH 8.6); clear smooth boundary. (5 to 15 inches thick)

Bky--18 to 32 inches; light brown (7.5YR 6/4) very gravelly sandy loam, strong brown (7.5YR 5/6) moist; massive; soft, very friable, slightly sticky and nonplastic; common fine and very fine roots; many very fine irregular pores; 30 percent gravel, 10 percent cobble, and 5 percent stones; violently effervescent with calcium carbonate segregated as common fine irregular soft masses, seams and pendants on rock fragments, 37 percent calcium carbonate equivalent; 10 percent crystalline gypsum occurs as pendants on rock fragments; moderately alkaline (pH 8.4); abrupt smooth boundary. (0 to 15 inches thick)

By1--32 to 48 inches; light brown (7.5YR 6/4) very gravelly sandy loam, strong brown (7.5YR 5/6) moist; massive; slightly hard, friable, nonsticky and nonplastic; few fine and very fine roots; many fine and very fine irregular pores; 50 percent gravel and 10 percent cobble; strongly effervescent, 28 percent calcium carbonate equivilent; 25 percent crystalline gypsum as pendants on rock fragments; slightly alkaline (pH 7.8); abrupt smooth boundary. (5 to 20 inches thick)

By2--48 to 60 inches; reddish yellow (7.5YR 6/6) extremely gravelly loamy sand, strong brown (7.5YR 5/6) moist; single grain; loose; many fine and very fine irregular pores; 60 percent gravel, 10 percent cobble; strongly effervescent, 38 percent calcium carbonate equivalent; 20 percent crystalline gypsum as pendants on rock fragments; slightly alkaline (pH 7.8).

TYPE LOCATION: Mohave County, Arizona; about 0.6 miles south of Arizona - Utah state line; west of the Hurricane cliffs; 1100 feet north and 1600 feet east of the southwest corner of section 31, T.42 N., R.9 W; Latitude 36 degrees 59 minutes 40 seconds North, Longitude 113 degrees 18 minutes 40 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. Typic aridic soil moisture regime.

Rock Fragments: 30 to 60 percent gravel, 5 to 15 percent cobble, and 0 to 10 percent stones

Soil Temperature: 59 to 72 degrees F.

Depth to Calcic horizon: 1 to 10 inches

Depth to Gypsic horizon: 15 to 35 inches


A horizon

Value: 5 through 7 dry, 4 through 5 moist

Chroma: 4 through 6, dry or moist


Bk horizon

Value: 6 or 7 dry, 4 or 5 moist

Chroma: 4 through 6, dry or moist

Texture of the fine earth: sandy loam, loam (5 to 15 percent clay)

Reaction: moderately or strongly alkaline

Calcium carbonate: 20 to 40 percent calcium carbonate equivalent


By horizon

Value: 5 through 7 dry, 4 through 5 moist

Chroma: 4 through 6, dry or moist

Texture of the fine earth: loamy sand, sandy loam, loam (less than 15 percent clay)

Calcium carbonate: 18 to 40 percent calcium carbonate equivalent

Gypsum: 5 to 60 percent

COMPETING SERIES: There are no competing series.

GEOGRAPHIC SETTING: Akinville soils are on fan terraces and have slopes of 2 to 20 percent. These soils formed in mixed alluvium and colluvium derived from sedimentary formations high in gypsum and calcium carbonate. Elevation ranges from 1600 to 4500 feet. Mean annual precipitation is 8 to 12 inches. The mean annual air temperature is 57 to 70 degrees F. The frost-free period is 180 to 240 days.

GEOGRAPHICALLY ASSOCIATED SOILS: These are the Mokaac and Ruesh soils. Mokaac soils are sandy-skeletal. Ruesh soils contain less than 35 percent rock fragments.

DRAINAGE AND PERMEABILITY: Somewhat excessively drained; low to medium runoff; moderate over very rapid permeability.

USE AND VEGETATION: Akinville soils are used for livestock grazing and wildlife habitat. The present vegetation is creosotebush, white bursage, range ratany, staghorn cholla, pricklypear, wolfberry, threeawn, big galleta, Mormon-tea, sand dropseed, and banana yucca.

DISTRIBUTION AND EXTENT: Northern Arizona. This series is of small extent in MLRA 30.

MLRA SOIL SURVEY REGIONAL OFFICE (MO) RESPONSIBLE: PHOENIX, ARIZONA

SERIES ESTABLISHED: Mohave County, Arizona; Soil survey of Shivwits Area, Arizona, Part of Mohave County; 1994.

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

Ochric epipedon - The zone from 0 to 2 inches (A horizon)

Calcic horizon - The zone from 2 to 32 inches (Bk1, Bk2, Bky horizons)

Gypsic horizon - The zone from 18 to 60 inches (Bky, By1, By2 horizons)

Percent gypsum x centimeters thickness = greater than 3000

Percent gypsum plus calcium carbonate = greater than 40 percent

Formerly classified as Typic Gypsiorthids.

ADDITIONAL DATA: NSSL Reference sample S89AZ - 015 - 5

Responsibility for this series was transferred from Davis to Phoenix 4/2015. The last revision to the series was 6/1998. ET

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National Cooperative Soil Survey
U.S.A.