LOCATION IFTEEN                  NV

Established Series
Rev. LJL/RLB/TM
04/2015

IFTEEN SERIES

The Ifteen series consists of very deep, well drained soils that formed in alluvium derived from limestone. Ifteen soils are on fan remnants. Slope ranges from 2 to 30 percent. The mean annual precipitation is about 6 inches and the mean annual air temperature is about 60 degrees F.

TAXONOMIC CLASS: Coarse-loamy, carbonatic, thermic Durinodic Haplocalcids

TYPICAL PEDON: Ifteen extremely gravelly very fine sandy loam, rangeland and wildlife habitat. (Colors are for dry soil unless otherwise noted.) The soil surface is covered by approximately 65 percent pebbles, of which over one-half is pan fragments.

A--0 to 2 inches; light yellowish brown (10YR 6/4) extremely gravelly very fine sandy loam, dark yellowish brown (10YR 4/4) moist; strong very thick and medium platy structure; slightly hard, very friable, nonsticky and nonplastic; many very fine, common fine, medium and few coarse vesicular pores; 65 percent pebbles, of which over one-half are pan fragments; strongly effervescent (16 percent calcium carbonate equivalent in the fine earth fraction); moderately alkaline (pH 8.4); clear smooth boundary. (1 to 3 inches thick)

Bw1--2 to 6 inches; light yellowish brown (10YR 6/4) very fine sandy loam, brown (7.5YR 4/4) moist; moderate thick platy structure parting to medium subangular blocky; soft, very friable, nonsticky and nonplastic; common very fine roots; common very fine and few fine tubular and interstitial pores; violently effervescent (20 percent calcium carbonate equivalent in the fine earth fraction); very strongly alkaline (pH 9.2); clear wavy boundary.

Bw2--6 to 15 inches; light brown (7.5YR 6/4) fine sandy loam, brown (7.5YR 4/4) moist; weak medium subangular blocky structure; soft, very friable, nonsticky and slightly plastic; many very fine and few fine, medium and coarse roots; common very fine and few fine tubular and interstitial pores; 5 percent pebbles; violently effervescent (20 percent calcium carbonate equivalent in the fine earth fraction); strongly alkaline (pH 8.6); clear wavy boundary. (The combined thickness of the Bw horizons is 9 to 18 inches.)

Bk--15 to 36 inches; pinkish white (7.5YR 8/2) loam, light brown (7.5YR 6/4) moist; massive; slightly hard, friable, slightly sticky and slightly plastic; few very fine roots; few very fine interstitial pores; disseminated calcium carbonate through out; 10 percent pebbles; violently effervescent (50 percent calcium carbonate equivalent in the fine earth fraction); strongly alkaline (pH 8.8); clear wavy boundary. (14 to 24 inches thick)

2Bqk--36 to 60 inches; pinkish white (7.5YR 8/2) extremely gravelly fine sandy loam, light brown (7.5YR 6/4) moist; massive; slightly hard, friable, nonsticky and slightly plastic; few very fine roots; 80 percent discontinuous bands of strongly cementated silica and calcium carbonate; 70 percent pebbles and 5 percent cobbles; violently effervescent (25 percent calcium carbonate equivalent in the fine earth fraction); strongly alkaline (pH 8.6).

TYPE LOCATION: Clark County, Nevada; approximately 7 miles north of Jean; about 1,130 feet west and 2,150 feet north of the southeast corner of section 8, T. 24 S., R. 60 E.; USGS Jean, NV 7.5 minute topographic quadrangle; 35 degrees, 52 minutes, 19 seconds north latitude and 115 degrees, 16 minutes, 49 seconds west longitude; UTM 11s, 655253e, 3971111n; NAD 83.

RANGE IN CHARACTERISTICS:

Soil moisture - Usually dry, moist in some part for short periods during winter and early spring and for 10 to 20 days cumulative between July to October following convection storms. The soils have a typic aridic moisture regime.

Soil temperature - 59 to 65 degrees F.

Depth to calcic horizon - 14 to 20 inches.

Depth to discontinuous silica cementation - 30 to 38 inches.

Control section - Clay content: Averages 8 to 16 percent.

Rock fragments: Averages 15 to 20 percent mainly gravel; 0 to 15 percent in the upper part and 65 to 80 percent in the lower part.

Bw horizons Hue: 10YR or 7.5 YR.
Value: 6 or 7 dry.
Chroma: 4 through 6 dry and moist.
Clay content: 8 to 16 percent.
Rock fragments: 0 to 15 percent pebbles.
Structure: subangular blocky or platy parting to subangular blocky.
Consistence: Soft or slightly hard, nonplastic or slightly plastic.
Calcium carbonate equivalent: 15 to 30 percent in the fine earth fraction, and 25 to 35 percent in the less than 20 millimeter fraction.
Other features: Few fine soft masses of calcium carbonate in the lower part of some pedons.

Bk horizon - Hue: 10YR or 7.5YR.
Value: 6 through 8 moist.
Chroma: 1 through 4 dry and moist.
Clay content: 8 to 16 percent.
Texture: Loam or fine sandy loam
Rock fragments: 0 to 15 percent gravel.
Effervescence: Strongly effervescent or violently effervescent.
Calcium carbonate equivalent in the fine earth fraction: 40 to 60 percent.

2Bqk horizon - Hue: 10YR or 7.5YR.
Value: 7 or 8 dry, 5 or 6 moist.
Chroma: 2 through 4 dry and moist.
Texture: Fine sandy loam or sandy loam.
Clay content: 6 to 12 percent.
Rock fragments: 60 to 75 percent mainly gravel with 0 to 10 percent cobbles.
Effervescence: Strongly effervescent or violently effervescent.
Reaction: Moderately alkaline or strongly alkaline.
Calcium carbonate equivalent: 20 to 35 percent in the fine earth fraction, 40 to 60 percent in the less than 20 millimeter fraction
Other features: 40 to 80 percent discontinous weak to strong silica and calcium carbonate cementation.

COMPETING SERIES: There are no competing series. Similar series are Kurstan (NV) soils. Kurstan soils have mixed mineralogy and contain 15 to 35 percent rock fragments. Depth to calcic horizon range from 5 to 14 inches and lack extremely gravelly substratum.

GEOGRAPHIC SETTING: Ifteen soils are on fan remnants. These soils formed in alluvium derived from limestone. Slope ranges from 2 to 30 percent. Elevations are 2,000 to 3,400 feet. The climate is hot and arid with warm, moist winters and hot, dry summers. The mean annual precipitation is 3 to 7 inches; mean annual air temperature is 57 to 63 degrees F., and the frost-free season is 180 to 240 days.

GEOGRAPHICALLY ASSOCIATED SOILS: These are the Weiser and Wechech series. Weiser and Wechech soils have loamy-skeletal control sections. Wechech soils are shallow to a petrocalcic horizon.

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

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

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

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

SERIES ESTABLISHED: Clark County Area, Nevada, 2006. Proposed in Clark County, Nevada, 1994. The name is coined from Interstate 15 that runs through the map unit.

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

Ochric epipedon - 0 to 7 inches (A, Bw1 and part of the Bw2 horizon).

Calcic horizon - 15 to 36 inches (Bk horizon).

Durinodic feature - 36 to 60 inches (2Bqk horizon).

Particle-size control section - 10 to 40 inches (Bk horizon and part of the Bw2 and 2Bqk horizons).

Responsibility for this series was transferred from Davis to Phoenix 4/2015. The last revision to the series was 7/2006. ET

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National Cooperative Soil Survey
U.S.A.