LOCATION LEGRAY CA

Tentative Series
Rev. SG/KJO/MRS/KDA/KP
12/2022

LEGRAY SERIES

The Legray series consists of very deep, well drained soils that formed in alluvium derived from granitoid and/or sedimentary rock. The Legray soils are on hillslopes. Slope is 15 to 50 percent. The mean annual precipitation is about 203 mm (8 in) and the mean annual temperature is about 18 degrees C (64 degrees F).

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

TYPICAL PEDON: Legray sandy loam, in oil field, on a backslope with a southwest aspect, at an elevation of 297 meters (975 feet) (Colors are for dry soil unless otherwise stated. When described on August 3, 1992, the soil was dry throughout.)

A--0 to 10 cm (0 to 4 in); very pale brown (10YR 7/3) cobbly sandy loam, brown (10YR 5/3) moist; 10 percent clay; moderate medium platy structure; slightly hard, very friable, nonsticky and nonplastic; common very fine and few fine roots; few very fine tubular pores and few very fine interstitial pores; calcium carbonate equivalent of 3 percent; slightly effervescent; carbonates disseminated; 10 percent sedimentary gravel and 5 percent sedimentary cobbles; moderately alkaline (pH 8.0); abrupt smooth boundary. (10 to 15 cm [4 to 6 in] thick)

Bw--10 to 33 cm (4 to 13 in); very pale brown (10YR 7/3) cobbly sandy loam, yellowish brown (10YR 5/4) moist; 12 percent clay; weak medium subangular blocky structure; slightly hard, very friable, nonsticky and nonplastic; common very fine and few fine roots; few very fine tubular and few very fine interstitial pores; calcium carbonate equivalent of 3 percent; strongly effervescent; carbonates disseminated; 10 percent sedimentary gravel and 10 percent sedimentary cobbles; moderately alkaline (pH 8.2); abrupt smooth boundary. (15 to 25 cm [6 to 10 in] thick)

Bk--33 to 66 cm (13 to 26 in); very pale brown (10YR 7/3) very gravelly loamy sand, yellowish brown (10YR 5/4) moist; 12 percent clay; weak medium subangular blocky structure; soft, very friable, nonsticky and nonplastic; common very fine roots; common very fine tubular pores and common very fine interstitial pores; calcium carbonate equivalent of 4 percent; violently effervescent; carbonates disseminated; 25 percent sedimentary gravel and 10 percent sedimentary cobbles; moderately alkaline (pH 8.0); abrupt smooth boundary. (25 to 38 cm [10 to 15 in] thick)

Btk--66 to 81 cm (26 to 32 in); very pale brown (10YR 7/3) very cobbly loamy sand, yellowish brown (10YR 5/4) moist; 5 percent clay; massive; soft, very friable, nonsticky and nonplastic; few very fine roots; common very fine tubular pores and common very fine interstitial pores; calcium carbonate equivalent of 2 percent; common distinct clay films bridging sand grains; slightly effervescent; carbonates disseminated; 20 percent sedimentary gravel and 35 percent sedimentary cobbles; moderately alkaline (pH 8.0); abrupt smooth boundary. (10 to 20 cm [4 to 8 in] thick)

Bt1--81 to 99 cm (32 to 39 in); very pale brown (10YR 7/4) very cobbly loamy sand, yellowish brown (10YR 5/6) moist; 5 percent clay; massive; soft, very friable, nonsticky and nonplastic; few fine roots; few fine tubular pores; common distinct clay films bridging sand grains; common very fine interstitial pores; 30 percent sedimentary gravel and 20 percent sedimentary cobbles; slightly alkaline (pH 7.5); abrupt smooth boundary. (13 to 23 cm [5 to 9 in] thick)

Bt2--99 to 122 cm (39 to 48 in); very pale brown (10YR 7/4) very gravelly loamy sand, yellowish brown (10YR 5/6) moist; 5 percent clay; massive; hard, friable, nonsticky and nonplastic; few fine tubular pores and common very fine interstitial pores; common faint clay films bridging sand grains; 20 percent sedimentary gravel; slightly alkaline (pH 7.5); abrupt smooth boundary. (18 to 30 cm (7 to 12 in] thick)

C1--122 to 155 cm (48 to 61 in); very pale brown (10YR 7/4) gravelly loamy sand, yellowish brown (10YR 5/6) moist; 5 percent clay; massive; soft, very friable, nonsticky and nonplastic; no roots; few very fine interstitial pores; 20 percent sedimentary gravel; slightly alkaline (pH 7.5); abrupt smooth boundary. (25 to 41 cm [10 to 16 in] thick)

C2--155 to 165 cm (61 to 65 in); very pale brown (10YR 7/4) very cobbly loamy sand, yellowish brown (10YR 5/6) moist; 5 percent clay; massive; soft, very friable, nonsticky and nonplastic; no roots; few very fine interstitial pores; 25 percent sedimentary gravel and 25 percent sedimentary cobbles; slightly alkaline (pH 7.5).

TYPE LOCATION: Kern County, California, Southwest Part; in map unit 660, Elkhills-Legray complex, 15 to 30 percent slopes; about 1.25 miles (2.0 kilometers) northeast of Taft; about 75 meters (250 feet) south and 105 meters (350 feet) east of the northwest corner of section 7, T. 32 S., R. 24 E.; San Bernardino Base and Meridian; latitude 35 degrees, 09 minutes, 55 seconds north and longitude 119 degrees, 26 minutes, 46 seconds west; USGS Taft, California, Quadrangle, NAD83.

RANGE IN CHARACTERISTICS:

Soil temperature: Mean annual soil temperature at 50 cm is 17 to 19 degrees C (62 to 67 degrees F) and the soil temperature is never below 8 degrees C (47 degrees F). The soils have a thermic temperature regime.

Soil moisture: The soils have an aridic moisture regime. The soil moisture control section is dry throughout from mid April to mid December and is never moist more than 90 consecutive days.

Diagnostic feature(s):
Ochric epipedon thickness: 10 to 18 cm
Cambic horizon thickness: 15 to 50 cm
Calcic horizon thickness: 15 to 50 cm

Particle size control section weighted average:
Rock fragments: 0 to 15 percent gravel
Clay content: 3 to 10 percent
Gypsum content: 0 to 2 percent

Surface fragments: About 10 to 30 percent gravels and 2 to 10 percent cobbles consisting of granitoid and/or sedimentary rock.

A horizon:
Hue: 10YR, 2.5Y
Value: 6 or 7 dry, 4 or 5 moist
Chroma: 3 or 4, dry or moist
Texture of the fine earth fraction: sandy loam
Content of clay: 8 to 18 percent
Content of organic matter: 0.5 to 1 percent
Electrical Conductivity: 1 to 4 decisemens per meter
Sodium Adsorption Ratio: 1 to 10
Calcium Carbonate Equivalent: 2 to 4 percent
Reaction: moderately alkaline
Content of rock fragments: 7 to 25 percent
5 to 15 percent gravel
2 to 10 percent cobbles

Bw horizon:
Hue: 10YR, 2.5Y
Value: 6 or 7 dry, 4 or 5 moist
Chroma: 3 or 4, dry or moist
Texture of the fine earth fraction: sandy loam
Content of clay: 8 to 18 percent
Content of organic matter: 0.4 to 0.6 percent
Electrical Conductivity: 1 to 4 decisemens per meter
Sodium Adsorption Ratio: 1 to 10
Calcium Carbonate Equivalent: 2 to 4 percent
Reaction: moderately alkaline
Content of rock fragments: 10 to 30 percent
5 to 15 percent gravel
5 to 15 percent cobbles

Bk horizon:
Hue: 10YR, 2.5Y
Value: 6 or 7 dry, 4 or 5 moist
Chroma: 3 or 4, dry or moist
Texture of the fine earth fraction: loamy sand, sandy loam
Content of clay: 8 to 18 percent
Content of organic matter: 0.3 to 0.5 percent
Electrical Conductivity: 1 to 4 decisemens per meter
Sodium Adsorption Ratio: 1 to 10
Calcium Carbonate Equivalent: 3 to 4 percent
Reaction: moderately alkaline
Content of rock fragments: 25 to 45 percent
20 to 30 percent gravel
5 to 15 percent cobbles

Btk horizon:
Hue: 10YR, 2.5Y
Value: 6 or 7 dry, 4 or 5 moist
Chroma: 3 or 4, dry or moist
Texture of the fine earth fraction: loamy coarse sand, loamy sand
Content of clay: 3 to 10 percent
Content of organic matter: 0. to 0.4 percent
Electrical Conductivity: 1 to 8 decisemens per meter
Sodium Adsorption Ratio: 1 to 10
Calcium Carbonate Equivalent: 1 to 3 percent
Reaction: moderately alkaline
Content of rock fragments: 45 to 65 percent
15 to 25 percent gravel
30 to 40 percent cobbles

Bt horizons:
Hue: 10YR, 2.5Y
Value: 6 or 7 dry, 4 or 5 moist
Chroma: 3 to 6, dry or moist
Texture of the fine earth fraction: loamy coarse sand, loamy sand
Content of clay: 3 to 10 percent
Content of organic matter: 0.05 to 0.3 percent
Electrical Conductivity: 1 to 8 decisemens per meter
Sodium Adsorption Ratio: 1 to 6
Calcium Carbonate Equivalent: 0 to 1 percent
Reaction: slightly alkaline
Content of rock fragments: 15 to 60 percent
15 to 35 percent gravel
15 to 25 percent cobbles

C horizons:
Hue: 10YR, 2.5Y
Value: 6 or 7 dry, 4 or 5 moist
Chroma: 3 or 4 dry, 3 to 6 moist
Texture of the fine earth fraction: loamy coarse sand, loamy sand
Content of clay: 3 to 10 percent
Content of organic matter: 0.01 to 0.1 percent
Electrical Conductivity: 1 to 8 decisemens per meter
Sodium Adsorption Ratio: 1 to 6
Calcium Carbonate Equivalent: 0 to 1 percent
Reaction: slightly alkaline
Content of rock fragments: 15 to 60 percent
15 to 35 percent gravel
20 to 30 percent cobbles

COMPETING SERIES: This is the Tugas (MLRA 42B) series. Tugas soils do not receive significant amounts of winter precipitation and have most of the rainfall occurring as high-intensity, convective thunderstorms from midspring to mid autumn.

GEOGRAPHIC SETTING: Legray soils are on hillslopes. Slope is 15 to 50 percent. Legray soils formed in alluvium derived from granitoid and/or sedimentary rock. Elevations are 144 to 447 meters (470 to 1,465 feet). The climate is arid with hot dry summers and cool, somewhat moist winters. The mean annual precipitation is 152 to 203 mm (6 to 8 inches). The mean annual air temperature is 16 to 18 degrees C (61 to 64 degrees F). Mean July temperature is about 29 degrees C (85 degrees F), and mean January temperature is about 8 degrees C (47 degrees F). The frost-free season is 240 to 300 days.

GEOGRAPHICALLY ASSOCIATED SOILS: These are the Elkhills, Hillbrick, and the Pyxo series. Elkhills soils on uplands have a coarse-loamy particle-size class and a calcareous mineralogy class. Hillbrick soils on foothills and mountains, are shallow, and have a loamy particle-size class and a calcareous mineralogy class. Pyxo soils on hills and mountains are moderately deep and have a coarse-loamy particle-size class.

DRAINAGE AND PERMEABILITY: Well drained; rapid to very rapid runoff; high saturated hydraulic conductivity.

USE AND VEGETATION: Legray soils are used for livestock grazing and oil production. Native vegetation is red brome, redstem filaree, bladder pod, perennial buckwheat, allscale saltbush, snakeweed, wild oats, and schismus.

DISTRIBUTION AND EXTENT: Among the Buena Vista hills and other hills arising out of the Buena Vista Lakebed of the Southern San Joaquin Valley of California, MLRA 17. The series is not extensive.

SOIL SURVEY REGIONAL OFFICE (SSRO) RESPONSIBLE: Davis, California

SERIES PROPOSED: Kern County, California, 1992. Legray is the name of a local road.

REMARKS:
Particle size control section for this pedon: 25 to 100 cm
Diagnostic horizons and features recognized in the profile are:
Ochric epipedon: 0 to 18 cm
Cambic horizon 10 to 33 cm
Calcic horizon: 33 to 66 cm

Soil classified using the 12th Edition of the Keys to Soil Taxonomy.

National Cooperative Soil Survey
U.S.A.