LOCATION TIPNAT NV

Established Series
Rev. JLL/LJL/TM/RLB
12/2015

TIPNAT SERIES

The Tipnat series consists of very deep, well drained soils that formed in mixed alluvium. The Tipnat soils are on alluvial flats. Slope ranges from 0 to 4 percent. The mean annual precipitation is about 6 inches and the mean annual temperature is about 66 degrees F.

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

TYPICAL PEDON: Tipnat loamy sand, rangeland and wildlife habitat. (Colors are for dry soils unless otherwise noted.) The soil surface is covered by approximately 25 percent pebbles.

A1--0 to 1 inch; pale brown (10YR 6/3) loamy sand, brown (10YR 4/3) moist; strong medium and thick platy structure; slightly hard, very friable, nonsticky and nonplastic; common very fine roots, many very fine and fine vesicular pores; 10 percent pebbles; slightly effervescent; strongly alkaline (pH 8.6); abrupt smooth boundary. (1 to 3 inches thick)

A2--1 to 3 inches; light yellowish brown (10YR 6/4) loamy sand, brown (7.5YR 5/3) moist; moderate thin and medium platy structure; soft, very friable, nonsticky and nonplastic; common very fine roots; many very fine interstitial and common very fine tubular pores; 10 percent pebbles; strongly effervescent (6 percent calcium carbonate in the fine earth fraction); strongly alkaline (pH 8.6); clear wavy boundary. (0 to 4 inches thick)

2Btnk--3 to 13 inches; light brown (7.5YR 6/4) sandy clay loam, brown (7.5YR 4/4) moist; weak medium and coarse prismatic structure parting to moderate medium and thick platy; slightly hard, very friable, moderately sticky and moderately plastic; common very fine and few fine roots; few very fine tubular pores; common thin clay films on faces of peds and bridging between mineral grains; few fine and medium segregated soft masses of calcium carbonate; common distinct calcium carbonate coats on rock fragments; 5 percent pebbles violently effervescent (8 percent calcium carbonate in the fine earth fraction); very strongly alkaline (pH 9.2); clear smooth boundary. (8 to 17 inches thick)

3Cky--13 to 60 inches; light brown (7.5YR 6/4) stratified sand to very gravelly sandy clay loam, brown (7.5YR 4/4) moist; massive; soft to hard, very friable, nonsticky to moderately sticky and nonplastic to moderately plastic; common very fine and few fine roots; common very fine interstitial pores; common medium segregated soft masses of calcium carbonate; common fine and medium soft masses of gypsum in the lower portion of the horizon; common distinct calcium carbonate coats on rock fragments; averages 10 percent pebbles; violently effervescent (6 percent calcium carbonate in the fine earth fraction); strongly alkaline (pH 8.6); abrupt wavy boundary.

TYPE LOCATION: Clark County, Nevada; about 6 miles southwest of Boulder City, NV located in the north end of Eldorado Valley; approximately 2,800 feet north and 2,720 feet east of the southeast corner of section 2, T. 24 S., R. 63 E.; USGS Boulder City NW, NV 7.5 minute topographic quadrangle; 35 degrees 53 minutes 18 seconds north latitude, 114 degrees 54 minutes 40 seconds west longitude; UTM 11s, 688544e, 3973579n; 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 summer convection storms. Has a typic aridic moisture regime.

Soil temperature - 66 to 71 degrees F.

Depth to base of natric horizon - 10 to 20 inches

Control section - Percent clay: 20 to 30 percent.

Rock fragments: 0 to 15 percent gravel.

A horizon - Hue 10YR or 7.5YR.

Value: 6 or 7 dry, 4 or 5 moist.

Chroma: 3 or 4, dry or moist.

2Btnk horizon - Hue 7.5YR or 10YR.

Value: 4 through 7 dry, 3 or 4 moist.

Chroma: 3 through 6, dry or moist.

Texture: Sandy clay loam, loam or clay loam.

Salinity: 4 - 8 mmhos/cm.

SAR 13 - 45.

Gypsum: 0 to 3 percent.

3Cky horizon - Hue 7.5YR, 10YR or 5YR.

Value: 5 through 7 dry, 3 through 5 moist.

Chroma: 3 or 4, dry or moist.

Texture: Stratified sand to very gravelly sandy clay loam.

Clay content: Average 6 to 18 percent.

Rock fragments: Averages 0 to 15 percent.

Structure: Massive or subangular blocky.

Gypsum: 1 to 5 percent.

COMPETING SERIES: These are the Casaga (NV), Corum (CA), Dusty (AZ), Garces (CA), Leuhman (T CA), Norob (CA), and Polvadero (T CA) series. Corum, Garces, Leuhman, Norob and Polvadero soils lack summer precipitation. Casaga soils have very gravelly textures at 20 to 40 inches. Corum soils have weathered granitic bedrock at a depth of 20 to 40 inches. Dusty soils have a calcic horizon. Garces soils have an argillic horizon extending past 20 inches.

GEOGRAPHIC SETTING: Tipnat soils are on alluvial flats. These soils formed in mixed alluvium. Slope ranges from 0 to 4 percent. Elevations are 1,700 to 2,700 feet. The climate is hot and arid with warm, moist winters and hot, dry summers. The mean annual precipitation is 5 to 7 inches; mean annual temperature is 64 to 69 degrees F., and the frost-free season is 240 to 300 days.

GEOGRAPHICALLY ASSOCIATED SOILS: These are the Bluepoint and Grapevine soils. Bluepoint soils have a sandy particle-size control section and Grapevine soils have a coarse-loamy particle-size control section. These soils do not have natric horizons.

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

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

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.

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

Ochric epipedon - 0 to 3 about inches (A1 and A2 horizons).

Natric horizon - 3 to 13 inches (2Btnk horizon).

Argillic horizon -3 to 13 inches (2Btnk horizon).

Particle-size control section - 3 to 13 inches (2Btnk horizon).

National Cooperative Soil Survey
U.S.A.