LOCATION KIDWELL                 NV

Established Series
Rev. KH/LJL/RLB
09/2015

KIDWELL SERIES

The Kidwell series consists of very deep, well drained soils that formed in alluvium derived from mixed volcanic sources. Kidwell soils are on fan remnants. Slope ranges from 2 to 8 percent. The mean annual precipitation is about 6 inches and the mean annual temperature is about 60 degrees F.

TAXONOMIC CLASS: Fine-loamy, mixed, superactive, thermic Typic Calciargids

TYPICAL PEDON: Kidwell very gravelly sandy loam, rangeland and wildlife habitat. (Colors are for dry soil unless otherwise noted.) The soil surface is partially covered by approximately 45 percent pebbles .

A1--0 to 1 inch; brown (10YR 5/3) very gravelly sandy loam, brown (10YR 4/3) moist; weak thin platy structure; soft, very friable, nonsticky and nonplastic; many very fine roots; many very fine interstitial pores; 35 percent pebbles; moderately alkaline (pH 8.0); clear wavy boundary. (1 to 2 inches thick)

A2--1 to 9 inches; yellowish brown (10YR 5/4) gravelly sandy loam, brown (10YR 4/3) moist; weak medium subangular blocky structure; slightly hard, very friable, slightly sticky and slightly plastic; many very fine roots; many very fine tubular pores; 15 percent pebbles; moderately alkaline (pH 8.0); clear wavy boundary. (5 to 8 inches thick)

Bt--9 to 15 inches; yellowish brown (10YR 5/4) gravelly sandy clay loam, dark yellowish brown (10YR 4/4) moist; moderate medium subangular blocky structure; slightly hard, very friable, moderately sticky and moderately plastic; common very fine roots; many very fine tubular pores; few faint clay films on faces of peds and coating sand grains; 20 percent pebbles; moderately alkaline (pH 8.2); clear wavy boundary. (4 to 13 inches thick)

Btk--15 to 31 inches; yellowish brown (10YR 5/4) gravelly sandy clay loam, dark yellowish brown (10YR 4/4); moderate medium subangular blocky structure; hard, friable, moderately sticky and moderately plastic; few very fine roots; common very fine tubular pores; common distinct clay films on faces of peds; many fine soft calcium carbonate masses; 15 percent pebbles; strongly effervescent; moderately alkaline (pH 8.2); clear wavy boundary. (14 to 35 inches thick)

Bk--31 to 60 inches; pale brown (10YR 6/3) gravelly sandy loam, brown (10YR 4/3) moist; massive; hard, friable, nonsticky and nonplastic; few very fine roots; few very fine tubular pores; many coarse and medium hard calcium carbonate masses; 30 percent pebbles; strongly effervescent; moderately alkaline (pH 8.4).

TYPE LOCATION: Clark County, Nevada; approximately 1 mile west and 5 miles south of Searchlight, Nevada on the west side of the powerline road in the north end of Piute Valley; about 2385 feet south and 830 feet west of the northeast corner of section 28, T. 29 S., R. 63 E.; USGS Searchlight, NV 7.5 minute topographic quadrangle; 35 degrees, 23 minutes, 33 seconds north latitude and 114 degrees, 56 minutes, 30 seconds west longitude; UTM 11, 686938e, 3918516n; NAD 83.

RANGE IN CHARACTERISTICS:

Soil moisture - Usually dry, moist in some part from December to March and intermittently moist for 10 to 20 days during July to October following summer convection storms; typic aridic moisture regime.

Soil temperature - 59 to 65 degrees F.

Depth to base of argillic horizon - 24 to 38 inches.

Depth to secondary calcium carbonate accumulation - 10 to 23 inches.

Control section - Percent clay: 20 to 30 percent.
Rock fragments: 15 to 35 percent, mainly gravel.
Reaction: Moderately alkaline or strongly alkaline.

A horizon - Hue: 7.5YR or 10YR.
Value: 5 or 6 dry, 3 or 4 moist.
Chroma: 3 or 4 dry and moist.

Bt horizon - Hue: 7.5YR or 10YR.
Value: 5 or 6 dry.
Chroma: 4 through 6 dry and moist.
Texture: Sandy clay loam or clay loam.

Btk horizon - Hue: 7.5YR or 10YR
Value: 5 throuh 8 dry.
Chroma: 4 through 6 dry and moist.
Calcium carbonate equivalent in the fine earth fraction: 15 to 25 percent.
Texture: Sandy clay loam or clay loam.

Bk or Bqk horizon - Hue: 7.5YR or 10YR
Value: 6 through 8 dry, 4 through 6 moist.
Chroma: 3 through 6.
Texture: Coarse sandy loam or sandy loam.
Rock fragments: 10 to 35 percent, mainly gravel.
Calcium carbonate equivalent in the fine earth fraction: 5 to 15 percent.
Reaction: Moderately alkaline and strongly alkaline.

COMPETING SERIES: These are the Blackmagic, (CA), Cornville (AZ), Dona Ana (NM), Hap (NM), Jagerson (AZ), Madurez (NM), McNew (NM), Mohave (AZ), Nutt (NM), Poachie (AZ) and Tres Hermanos (NM) series. Blackmagic and Pochie soils average 5 to 15 percent rock fragments in the control section. Cornville, Dona Ana, Madurez and Tres Hermanos soils are moist in the control section for more than 20 days in the summer. Jagerson soils have a calcic horizon that occurs below the argillic horizon. Madurez soils have Bt Horizons with hues of 2.5YR or 5YR. McNew and Nutt soils have 0 to 5 percent rock fragments in the control section. Dona Ana and Tres Hermanos soils are calcareous to the surface. Madurez soils lack a Btk horizon and have an argillic horizon thinner than 10 inches.

GEOGRAPHIC SETTING: Kidwell soils are on fan remnants. These soils form in alluvium derived from mixed volcanic sources. Slope ranges from 2 to 8 percent. Elevations are 2,500 to 4,100 feet. The climate is hot and arid with cool, moist winters and hot, dry summers. The mean annual precipitation is 5 to 7 inches; mean annual temperature is 57 to 63 degrees F., and the frost-free season is 180 to 240 days.

GEOGRAPHICALLY ASSOCIATED SOILS: These are the Arizo, Crosgrain, Lanip and Tenwell soils. Arizo and Crosgrain soils do not have an argillic horizon. Arizo soils are sandy-skeletal. Crosgrain soils and Tenwell soils have duripans. Arizo, Crosgrain, Lanip and Tenwell soils do not have calcic horizons.

DRAINAGE AND PERMEABILITY: Well drained; medium runoff; moderately slow permeability.

USE AND VEGETATION: These soils are used for rangeland and wildlife habitat. The present vegetation is mainly big galleta, bush muhly, Indian ricegrass, creosotebush, ephedra, winterfat and range ratany.

DISTRIBUTION AND EXTENT: Mojave Desert of southern Nevada. These soils are not extensive. MLRA 30

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

SERIES ESTABLISHED: Clark County Area, Nevada, 2006. Proposed in Clark County, Nevada, 1993. The name is coined.

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

Ochric epipedon - 0 to 9 inches (A1 and A2 horizons).
Argillic horizon - 9 to 31 inches (Bt and Btk horizons).
Calcic horizon - 15 to 31 inches (Btk horizon).
Particle size control section - 9 to 29 inches.

Responsibility for this series was transferred from Davis to Phoenix 9/2015. The last revision to the series was 7/2006. ET

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National Cooperative Soil Survey
U.S.A.