LOCATION PATSCAMP                CA

Established Series
Rev: PBF/CAH/ET
12/2015

PATSCAMP SERIES

The Patscamp series consists of very deep, well drained soils that formed in alluvium derived from granitoid rocks. Patscamp soils are on fan aprons over fan remnants. Slopes range from 2 to 8 percent. The mean annual precipitation is about 100 millimeters (4 inches) and the mean annual air temperature is about 21.5 degrees C (71 degrees F).

TAXONOMIC CLASS: Fine-loamy, mixed, superactive, hyperthermic Calcic Paleargids

TYPICAL PEDON: Patscamp loamy fine sand, on a linear, 4 percent slope under burrobush and creosote bush at an elevation of 312 meters (1,024 feet). (Colors are for dry soil unless otherwise noted). The surface is covered by approximately 25 percent fine and 50 percent medium and coarse gravel.

A -- 0 to 3 centimeters (0 to 1 inch); very pale brown (10YR 7/4) loamy fine sand, brown (10YR 4/3) moist; moderate thick platy structure; slightly hard, very friable, nonsticky and nonplastic; few very fine roots; few fine and few medium vesicular pores; 5 percent fine gravel and 5 percent medium and coarse gravel; slightly effervescent; moderately alkaline (pH 8.1); clear wavy boundary. (2 to 5 centimeters thick)

C -- 3 to 26 centimeters (1 to 10 inches); very pale brown (10YR 7/3) gravelly sand, brown (10YR 5/3) moist; single grain; loose, nonsticky and nonplastic; common very fine and fine, and few medium roots; 10 percent fine gravel and 5 percent medium and coarse gravel; very slightly effervescent; strongly alkaline (pH 8.5); abrupt smooth boundary. (20 to 45 centimeters thick)

2Btk -- 26 to 43 centimeters (10 to 17 inches); strong brown (7.5YR 5/6) sandy clay loam, strong brown (7.5YR 4/6) moist; weak medium subangular blocky structure; hard, very friable, slightly sticky and moderately plastic; very few fine roots; 30 percent distinct, strong brown (7.5YR 4/6) clay films on ped faces; 5 percent prominent, very pale brown (10YR 8/2), fine calcium carbonate threads on all ped faces; 4 percent fine gravel and 1 percent medium and coarse gravel; slightly effervescent; moderately alkaline (pH 8.2); gradual wavy boundary.

2Btkq1 -- 43 to 89 centimeters (17 to 35 inches); brown (7.5YR 5/4) sandy clay loam, brown (7.5YR 5/4) moist; weak medium subangular blocky structure; hard, friable, moderately sticky and moderately plastic; very few fine roots; 10 percent distinct, brown (7.5YR 4/4) clay films on ped faces; 5 percent prominent, very pale brown (10YR 8/2) medium, irregular calcium carbonate masses in the matrix; 15 percent prominent, very pale brown (10YR 7/3), medium, irregular, strongly cemented durinodes in the matrix; 5 percent fine gravel and 2 percent medium and coarse gravel; strongly effervescent (7 percent calcium carbonate equivalent in the fine earth fraction); strongly alkaline (pH 8.7); gradual wavy boundary.

2Btkq2 -- 89 to 114 centimeters (35 to 45 inches); brown (7.5YR 5/4) sandy loam, brown (7.5YR 5/4) moist; weak medium subangular blocky structure parting to massive; moderately hard, friable, slightly sticky and moderately plastic; 5 percent distinct, brown (7.5YR 4/4) clay films on ped faces; 10 percent prominent, light gray (10YR 7/2), fine, irregular, soft calcium carbonate masses in the matrix; 5 percent prominent, very pale brown (10YR 7/3), fine and medium, irregular, moderately cemented durinodes in the matrix; 5 percent fine gravel and 2 percent medium and coarse gravel; slightly effervescent; moderately alkaline (pH 8.4); gradual wavy boundary. (Combined thickness of the 2Btk and 2Btkq horizons is 15 to 90 centimeters).

2Bkq1 -- 114 to 135 centimeters (45 to 53 inches); very pale brown (10YR 8/3) sandy loam, light brown (7.5YR 6/3) moist; massive; slightly hard, friable, slightly sticky and slightly plastic; 5 percent prominent, very pale brown (10YR 8/2) medium, irregular calcium carbonate masses in the matrix; 25 percent distinct, very pale brown (10YR 8/2), fine and medium, irregular, moderately cemented durinodes in the matrix; 5 percent fine gravel and 5 percent medium and coarse gravel; violently effervescent (15 percent calcium carbonate equivalent in the fine earth fraction); strongly alkaline (pH 8.7); gradual wavy boundary.

2Bkq2 -- 135 to 160 centimeters (53 65 inches); very pale brown (10YR 8/3) gravelly sandy loam, light brown (7.5YR 6/3) moist; massive; moderately hard, friable, slightly sticky and nonplastic; 2 percent prominent, very pale brown (10YR 8/2) fine, irregular calcium carbonate masses in the matrix; 2 percent prominent, very pale brown (10YR 7/4) silica coats on rock fragments; 15 percent distinct, very pale brown (10YR 8/2), fine and medium, irregular, moderately cemented durinodes in the matrix; 10 percent fine gravel and 5 percent medium and coarse gravel; violently effervescent (9 percent calcium carbonate equivalent in the fine earth fraction); strongly alkaline (pH 8.8). (Combined thickness of the 2Bkq horizons is 35 to 90 centimeters).

TYPE LOCATION: Riverside County, California; about 7.75 kilometers (4.8 miles) south southwest of the junction of Highways 62 and 177; 1.1 km (0.7 miles) south and 213 meters (700 feet) west of the junction of MWD Aqueduct Road and Old Patton Camps Supply Road; 213 meters (700 feet) south and 176 meters (577 feet) west of the NE corner of sec. 23, T. 2 S., R. 16 E., San Bernardino Baseline and Meridian; 33 degrees, 59 minutes and 17.6 seconds north latitude and 115 degrees, 15 minutes and 52.8 seconds west longitude; USGS Coxcomb Mountains 7.5 minute topographic quadrangle; UTM 11S 0660286e 3762205n (DTM: NAD83).

RANGE IN CHARACTERISTICS:

Soil moisture control section: usually dry, moist in some parts for short
periods during winter and early spring and for 10 to 20 days cumulative
between July and September following convection storms. The soils have
a typic-aridic soil moisture regime.

Soil temperature: 22 to 25 degrees C (72 to 77 F).

Surface rock fragments: 50 to 80 percent.

Control section -
Clay content: 18 to 27 percent.
Organic matter: 0 to 0.5 percent.
Rock fragments: 5 to 15 percent gravel.
Depth to the upper boundary of an argillic horizon: 25 to 50 centimeters
(10 to 20 inches).
Depth to the upper boundary of a calcic horizon: 75 to 125 centimeters (30
to 50 inches).

A horizon
Hue: 10YR or 2.5Y.
Value: 6 or 7 dry, and 4 or 5 moist.
Chroma: 3 or 4, dry or moist.
Texture of the fine earth: loamy sand or loamy fine sand.
Clay content: 2 to 6 percent.
Rock fragments: 5 to 10 percent.
Effervescence: noneffervescent through slightly effervescent.
Calcium carbonate equivalent: 0 to 1 percent.
Reaction: slightly or moderately alkaline.

C horizon
Hue: 10YR or 2.5Y.
Value: 6 or 7, dry and 4 or 5, moist.
Chroma: 3 or 4, dry or moist.
Texture of the fine earth: coarse sand, sand or loamy sand.
Clay content: 1 to 6 percent.
Rock fragments: 5 to 15 percent.
Effervescence: noneffervescent through slightly effervescent.
Calcium carbonate equivalent: 0 to 1 percent.
Reaction: slightly through strongly alkaline.

2Bt, 2Btk or 2Btkq horizon
Hue: 7.5YR or 10YR.
Value: 4 to 6, dry and 4 or 5, moist.
Chroma: 4 to 6, dry or moist.
Texture of the fine earth: sandy loam or sandy clay loam.
Clay content: 18 to 27 percent.
Rock fragments: 3 to 15 percent.
Effervescence: noneffervescent through strongly effervescent.
Calcium carbonate equivalent: 1 to 20 percent.
Reaction: slightly through strongly alkaline.
Visible secondary carbonates: 0 to 20 percent as masses in the matrix.
Silica: 0 to 20 percent durinodes.

2Bk or 2Bkq horizon
Hue: 7.5YR or 10YR.
Value: 7 or 8, dry and 5 or 6, moist.
Chroma: 2 to 4, dry and 3 or 4, moist.
Clay content: 8 to 15 percent.
Rock fragments: 5 to 20 percent.
Calcium carbonate equivalent: 5 to 25 percent.
Reaction: moderately or strongly alkaline.
Visible secondary carbonates: 0 to 20 percent as masses in the matrix.
Silica: 0 to 35 percent durinodes.

2Ck or 2Ckq horizon (when present)
Hue: 7.5YR or 10YR.
Value: 7 or 8, dry and 5 or 6, moist.
Chroma: 2 to 4, dry or moist.
Texture of the fine earth: sand or loamy sand.
Clay content: 1 to 6 percent.
Rock fragments: 5 to 20 percent.
Effervescence: strongly or violently effervescent.
Calcium carbonate equivalent: 5 to 10 percent.
Reaction: moderately or strongly alkaline.
Visible secondary carbonates: 0 to 20 percent disseminated or as coats
on rock fragments.
Silica: 0 to 10 percent as films on rock fragments.

COMPETING SERIES: There are no competing series at this time.

GEOGRAPHIC SETTING: Patscamp soils are on fan aprons over fan remnants. Slopes range from 2 to 8 percent. These soils formed in alluvium derived from granitoid rocks. Elevations range from 200 to 800 meters (655 to 2,625 feet). The climate is arid, with hot, dry summers and warm, moist winters. The mean annual precipitation is 75 to 125 millimeters (3 to 5 inches) and the mean annual air temperature is 20 to 23 degrees C (68 to 73.5 degrees F). The frost-free season is 300 to 340 days.

GEOGRAPHICALLY ASSOCIATED SOILS: These are the Joetree and the Pintobasin soils. Joetree soils are on similar landscape positions and have more than 100 centimeters (40 inches) of loamy sand or sand above an argillic horizon and do not have a diagnostic calcic horizon. Pintobasin soils are on fan aprons, are sandy throughout the profile and do not have diagnostic horizons.

DRAINAGE AND SATURATED HYDRAULIC CONDUCTIVITY: Well drained; very low runoff; high saturated hydraulic conductivity above the argillic horizon, moderately high saturated hydraulic conductivity within the argillic horizon and high saturated hydraulic conductivity below the argillic horizon.

USE AND VEGETATION: Patscamp soils are used for recreation and wildlife habitat. The present vegetation is mainly creosote bush and burrobush.

DISTRIBUTION AND EXTENT: Southern Mojave Desert of southeastern California. MLRA 30. These soils are of small extent.

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

SERIES ESTABLISHED: Riverside County, California, Soil Survey of Joshua Tree National Park, California, 2012. The soil name is coined.

REMARKS: Diagnostic horizons and features in this pedon include:

Ochric epipedon - from a depth of 0 to 3 centimeters (A horizon).
Argillic horizon - from a depth of 26 to 114 centimeters (2Btk, 2Btkq1,
and 2Btkq2 horizons).
Calcic horizon - from a depth of 114 to 135 centimeters (2Bkq1 horizon).
Particle-size control section - from a depth of 26 to 76 centimeters
(2Btk horizon and the upper part of the 2Btkq1 horizon).

ADDITIONAL DATA: NASIS Pedon User ID: 12483034-I.

Responsibility for this series was transferred from Davis to Phoenix 12/2015. The last revision to the series was 5/2012. ET

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National Cooperative Soil Survey
U.S.A.