LOCATION JEAN                    NV

Established Series
Rev. LNL/ELS/RPZ
04/2015

JEAN SERIES

The Jean series consists of very deep, excessively drained soils that formed in sandy alluvial or aeolian materials over unconforming sandy-skeletal sediments from mixed rock sources. The Jean soils are on erosional fan remnants, inset fans, and channels. Slopes are 0 to 4 percent. The mean annual precipitation is about 6 inches and the mean annual temperature is about 65 degrees F.

TAXONOMIC CLASS: Sandy-skeletal, mixed, thermic Typic Torriorthents

TYPICAL PEDON: Jean gravelly loamy fine sandy-rangeland and wildlife habitat. (Colors are for dry soil unless otherwise noted.) The soil surface is covered by approximately 40 percent pebbles and a 1 percent cobbles.

A--0 to 1 inch; pink (7.5YR 7/4) gravelly loamy fine sand, brown (7.5YR 5/4) moist; weak medium platy structure; soft, very friable, nonsticky and nonplastic; many very fine and fine, and few medium vesicular pores; 20 percent pebbles; violently effervescent; moderately alkaline; (pH 8.3); abrupt smooth boundary. (l/2 to 2 inches thick)

AB--1 to 8 inches; light reddish brown (5YR 6/4) loamy fine sand, reddish brown (5YR 5/4) moist; weak very coarse prismatic structure; soft, very friable, nonsticky and nonplastic; common very fine roots; common very fine tubular pores; violently effervescent; moderately alkaline; (pH 8.4); clear smooth boundary. (5 to 8 inches thick)

Bk1--8 to 18 inches; pink (7.5YR 7/4) loamy fine sand, brown (7.5YR 5/4) moist; massive; soft, very friable, nonsticky and nonplastic; few very fine roots; many very fine interstitial pores; distinct calcium carbonate films on bottom of rock fragments; l0 percent pebbles; violently effervescent; moderately alkaline; (pH 8.4); clear smooth boundary. (8 to l2 inches thick)

2Bk2--18 to 25 inches; pink (7.5YR 7/4) very gravelly loamy sand, light reddish brown (7.5 6/4) moist; massive; soft, very friable, nonsticky and nonplastic; many very fine and fine interstitial pores; distinct calcium carbonate coats on bottom of rock fragments; 40 percent pebbles; violently effervescent; strongly alkaline; (pH 8.6); clear smooth boundary. (0 to l0 inches thick)

2C--25 to 60 inches; pink stratified extremely gravelly sand through very gravelly loamy fine sand, brown (7.5YR 5/4) moist; single grain; loose, nonsticky and nonplastic; many very fine and fine interstitial pores; violently effervescent; moderately alkaline (pH 8.4)

TYPE LOCATION: Clark County, Nevada; near the intersection of Decator Boulevard and Robindale Road; about 2,640 feet south of the northwest corner of section 7, T. 22 S., R. 6l E.; USGS Las Vegas SW, NV 7.5 minute quadrangle; 36 degrees, 2 minutes, 58 seconds north latitude and 115 degrees, 12 minutes, 27 seconds west longitude; UTM 11s, 661450e 3990930n; NAD83.

RANGE IN CHARACTERISTICS:
Soil moisture: Usually dry. Moist for short periods throughout the moisture control section December through March. Moist above and periodically in upper part of moisture control section, l to l0 days cumulative, June through August.
Soil temperature: 65 to 7l degrees F.
Depth to Bkl horizon: 5 to l0 inches.
Depth to skeletal material: l6 to 30 inches.

Control section
Texture of upper portion: Loamy fine sand or fine sand with less than l5 percent rock fragments.
Texture of lower portion: Averages extremely gravelly sand through very gravelly loamy fine sand.
Rock fragments: Averages 35 to 80 percent, mostly gravel.
Reaction: Moderately alkaline or strongly alkaline.

A horizon
Hue: 5YR, 7.5YR or l0YR
Value: 6 or 7 dry, 5 or 6 moist.
Chroma: 2 to 4.

AB horizon:
Hue: 5YR, or 7.5YR or l0YR.
Value: 5 or 6 dry, 4 or 5 moist.
Chroma: 3 through 5.
Other features: Redder hues and higher chroma reflect lithochromic colors.

C horizon
Calcium carbonate segregations: Commonly contains thin calcium carbonate coatings on undersides of pebbles or a few soft calcium carbonate masses within 40 inches.

COMPETING SERIES: These are the Arizo, Kokan, and Wickenburg soils. Arizo and Kokan soils lack Bw horizons and are skeletal throughout the control section. Wickenburg soils have a paralithic contact with granitic bedrock at a depth between 20 and 40 inches.

GEOGRAPHIC SETTING: Jean soils are on erosional fan remnants, inset fans, and channels. These soils formed in sandy alluvial or aeolian materials underlain by unconforming sandy-skeletal sediments from mixed rock sources. Slopes are 0 to 4 percent. Elevations are 2,000 to 3,600 feet. The climate is arid with hot dry summers and mild winters. The mean annual precipitation is 5 to 7 inches; mean annual temperature is 62 to 68 degrees F., and the frost-free season is 240 to 300 days.

GEOGRAPHICALLY ASSOCIATED SOILS: These are the Arizo Caliza, Goodsprings, Las Vegas, and McCullough series. Caliza soils have a calcic horizon. Goodsprings and Las Vegas soils have petrocalcic horizons. McCullough soils have coarse-loamy control sections.

DRAINAGE AND PERMEABILITY: Excessively drained; very low runoff; rapid permeability.

USE AND VEGETATION: These soils are used for rangeland, and wildlife habitat. The present vegetation is mainly creosotebush, white bursage, big galleta and Indian ricegrass.

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

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

SERIES ESTABLISHED: Clark County, (Las Vegas and El Dorado Valleys Area) Nevada. l964.

Particle-size control section 10 to 40 inches (Part of the Bk1, 2Bk2 and part of the 2C horizons).

Responsibility for this series was transferred from Davis to Phoenix 4/2015. The last revision to the series was 4/2006. ET

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National Cooperative Soil Survey
U.S.A.