LOCATION JANEFALLS               NV

Inactive Series
IRD: LJL/ET
02/2024

JANEFALLS SERIES

The Janefalls series consists of deep, well drained soils that formed in colluvium derived from limestone. The Janefalls soils are on backslopes of mountains. Slopes range from 15 to 75 percent. The mean annual precipitation is about 17 inches and the mean annual air temperature is about 43 degrees F.

TAXONOMIC CLASS: Loamy-skeletal, carbonatic, frigid Pachic Calciustolls

TYPICAL PEDON: Janefalls very gravelly sandy loam recreation and wildlife habitat. (Colors are for dry soil unless otherwise noted.) The surface is covered by approximately 50 percent gravel, 15 percent cobbles and 7 percent stones.

Oi--2 to 0 inches; 20 percent cover of undecomposed bark and needles.

A1--0 to 2 inches; brown (10YR 5/3) very gravelly loam, dark brown (10YR 3/3) moist; moderate fine and medium subangular blocky structure; slightly hard, very friable, slightly sticky and slightly plastic; common very fine roots; common fine and many very fine tubular pores; 35 percent pebbles, 5 percent cobbles and 2 percent stones; strongly effervescence; moderately alkaline (pH 8.2); abrupt smooth boundary.

A2--2 to 16 inches; very dark brown (7.5YR 2/3) very gravelly loam, dark brown (7.5YR 3/3) moist; moderate coarse subangular blocky structure; moderately hard, very friable, slightly sticky and moderately plastic; common very fine to very coarse roots; many very fine and common fine tubular pores; 1 percent fine prominent irregular white (10YR 8/1) carbonate masses in matrix; 45 percent pebbles; strongly effervescence (3 percent calcium carbonate equivalence in the fine earth fraction); moderately alkaline (pH 8.2); clear wavy boundary. (Combined thickness of the A horizons is 6 to 20 inches thick)

Bk1--16 to 33 inches; brown (10YR 5/3) extremely gravelly loam, dark brown (10YR 3/3) moist; massive; soft, very friable, slightly sticky and slightly plastic; common very fine and fine roots throughout and few medium and coarse roots throughout and few very coarse roots throughout; common fine interstitial and many very fine interstitial pores; 3 percent fine prominent white (10YR 8/1) carbonate masses with sharp boundaries in matrix; 40 percent pebbles and 20 percent cobbles; violently effervescence (45 percent calcium carbonate equivalence in the fine earth fraction); moderately alkaline (pH 8.2); clear wavy boundary. (10 to 20 inches thick)

Bk2--33 to 44 inches; brown (10YR 5/3) extremely gravelly loam, dark yellowish brown (10YR 4/4) moist; massive; soft, very friable, slightly sticky and slightly plastic; common very fine, fine and few medium, coarse and few very coarse roots; many very fine and common fine interstitial pores; 90 percent prominent white (10YR 8/1) carbonate coats on bottom surfaces of rock fragments and 90 percent prominent white (10YR 8/1) carbonate coats on top surfaces of rock fragments; 90 percent fine and medium prominent white (10YR 8/1) carbonate masses on bottom of rock fragments; 40 percent pebbles and 20 percent cobbles; violently effervescence (45 percent calcium carbonate equivalence in the fine earth fraction); moderately alkaline (pH 8.2); abrupt wavy boundary. (10 to 20 inches thick)

R--44 to 54 inches; limestone bedrock;

TYPE LOCATION: Clark County, Nevada; about 7 miles north and 30 miles east of Las Vegas, Nevada; approximately 900 feet east and 2000 feet south of Mary Jane Falls; tentatively sectionalized area of State Selection 400 feet south and 4300 feet west of the northwest corner of section 25, T. 19 S., R. 56 E.; 36 degrees, 16 minutes, 25.6 seconds north latitude and 115 degrees, 40 minutes, 9 seconds west longitude; USGS Charleston Peak, NV 7.5 minute quadrangle; UTM 11S, 0619532e 4015136n; NAD83.

RANGE IN CHARACTERISTICS:

Soil moisture - usually moist in late winter and spring, and periodically moist in the upper part following summer thunderstorms. Ustic soil moisture regime bordering on aridic.

Soil temperature: 53 to 59 degrees F.

Depth to lithic contact: 40 to 60 inches.

Depth to base of mollic epipedon: 30 to 60 inches.

Depth to calcic horizon: 6 to 20 inches.

Control section - Rock fragments: 35 to 70 percent, mainly gravel with 0 to 20 percent cobbles or stones.
Clay content: 6 to 15 percent.

Oi horizon - Organic matter: 30 to 60 percent.
Bulk density: 0.3 to 0.5

A or ABk horizons - Value: 4 or 5 dry.
Chroma: 2 or 3 moist.
Clay content: 8 to 18 percent.
Structure: Weak or moderate, fine through coarse.
Consistence: Soft through moderately hard.
Organic matter: 1.0 to 3.0 percent.
Reaction: Slightly alkaline or moderately alkaline.
Calcium carbonate equivalence of the fine earth: 0 to 20 percent.

Bk1 horizon - Value: 4 or 5 dry, 2 or 3 moist.
Chroma: 1 to 3.
Structure: Weak to strong, massive or subangular blocky.
Consistence: Nonsticky or slightly sticky and nonplastic or slightly plastic.
Organic matter: 1.0 to 3.0 percent.
Rock fragments: 50 to 90 percent
Calcium carbonate equivalence of the fine earth: 20 to 50 percent

Bk2 horizon - Value: 4 or 5 dry, 2 to 4 moist.
Chroma: 1 to 4.
Structure: Weak or medium, massive or subangular blocky.
Consistence: Nonsticky or slightly sticky and nonplastic or slightly plastic.
Organic matter: 0.5 to 2.0 percent.
Rock fragments: 35 to 70 percent, mainly gravel with 0 to 20 percent cobbles and stones.
Calcium carbonate equivalence of the fine earth: 40 to 70 percent.

COMPETING SERIES: This is the Maryjane series. Maryjane soils are very deep soils.

GEOGRAPHIC SETTING: Janefalls soils are on backslopes of mountains. Slopes range from 15 to 75 percent. These soils formed in colluvium derived from limestone. Elevations are 8000 to 9000 feet. The climate is sub-humid continental, cool, with moist winters and common summer thundershowers. The mean annual precipitation is 16 to 20 inches; mean annual air temperature is 41 to 45 degrees F., and the frost-free season is 50 to 90 days.

GEOGRAPHICALLY ASSOCIATED SOILS: These are Maryjane, Mountmummy, Robberfire, Tuffhike and Thesisters soils. Maryjane soils occur on inset fans and footslopes of mountains. Mountmummy soils occur on upper elevation south-facing backslopes of mountains and are moderately deep to bedrock. Rosespring and Tuffhike soils occur on upper elevation north-facing backslopes of mountains. Thesisters soils are very shallow or shallow to bedrock.

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

USE AND VEGETATION: Janefalls soils are used for recreation and wildlife habitat. The present vegetation is mainly ponderosa pine with some curlleaf mountainmahogany and currant.

DISTRIBUTION AND EXTENT: Mojave desert of southern Nevada, U.S.A.; MLRA 30. These soils are of small extent.

SOIL SURVEY REGIONAL OFFICE (SSRO) RESPONSIBLE: DAVIS, CALIFORNIA

SERIES PROPOSED: Clark County, Nevada; Clark County Soil Survey, 2005. The name is coined from Mary Jane Falls located in Kyle Canyon in the Spring Mountains.

REMARKS: Diagnostic horizons and features recognized in the profile are:
1. Mollic epipedon -- 1 to 59 inches (A1, A2, Bk1 and Bk2 horizons).
2. Calcic horizon -- 16 to 44 inches (Bk1 and Bk2 horizons).
3. Lithic contact -- 44 inches (R horizon).
4. Particle-size control section -- 10 to 40 inches (Part of the A2, Bk1 and part of the Bk2 horizons).

This series was correlated to the Maryjane series and made inactive in June 2005- ET

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National Cooperative Soil Survey
U.S.A.