LOCATION SUCCOR                  ID

Established Series
Rev. RS/ALH/CLM
11/2019

SUCCOR SERIES

The Succor series consists of very deep, well drained soils with slow permeability that formed in mixed alluvium from volcaniclastic material and lacustrine deposits. Succor soils are on pediments and landslide deposits. Slopes range from 3 to 35 percent. Average annual precipitation is 330 cm and average annual temperature is 8.9 degrees C.

TAXONOMIC CLASS: Fine, smectitic, mesic Typic Palexerolls

TYPICAL PEDON: Succor gravelly loam -- on a 4 percent north-facing slope, in native rangeland, at 1,410 meters elevation. (Colors are for air dry soils unless otherwise stated. When described on July 3, l984, the soil was dry to 13 cm and slightly moist below).

A1--0 to 5 cm; grayish brown (10YR 5/2) gravelly loam, very dark grayish brown (10YR 3/2) moist; moderate medium platy structure parting to weak fine subangular blocky; soft, very friable; slightly sticky and slightly plastic; common very fine, fine and medium roots; common very fine and fine vesicular pores; 20 percent gravel; neutral (pH 6.9); abrupt smooth boundary. (5 to 23 cm thick)

A2--5 to 13 cm; grayish brown (10YR 5/2) gravelly loam, very dark grayish brown (10YR 3/2) moist; moderate medium platy structure parting to weak very fine subangular blocky; soft, very friable, moderately sticky and moderately plastic; common very fine, fine and medium roots; common very fine and fine vesicular pores; 15 percent gravel; neutral (pH 7.3); abrupt smooth boundary. (0 to 20 cm thick)

Bt1--13 to 46 cm; brown (10YR 5/3) clay; dark brown (10YR 3/3) moist; strong medium prismatic structure parting to strong fine and medium angular blocky; very hard, firm, very sticky and very plastic; common very fine, fine and medium roots; few fine roots; many prominent clay films on faces of peds; 10 percent gravel; neutral (pH 7.2); clear smooth boundary. (15 to 53 cm thick)

Bt2--46 to 56 cm; light yellowish brown (10YR 6/4) clay loam; brown (10YR 4/3) moist; moderate very fine and fine subangular blocky structure; slightly hard, friable, moderately sticky and moderately plastic; few very fine and fine roots; few fine tubular pores; many distinct clay films on faces of peds and in pores; 5 percent gravel, 5 percent cobbles; neutral (pH 6.8), clear smooth boundary. (4 to 21 inches thick)

Bq1--56 to 84 cm; pale yellow (2.5Y 7/4) sandy loam, olive (5Y 5/4) moist; moderate medium platy structure parting to fine and very fine angular blocky; slightly hard, friable, nonsticky and nonplastic; few very fine roots; common moderately thick silica coatings on faces of peds; 5 percent gravel; neutral (pH 6.8); clear smooth boundary. (18 to 66 cm thick)

Bq2--84 to 152 cm; light gray (2.5Y 7/2) loam; olive (5Y 5/3) moist; massive; hard, firm, nonsticky and nonplastic; few very fine roots; common fine seams of silica; neutral (pH 7.1).

TYPE LOCATION: Owyhee County, Idaho; about 23 miles south and 11 miles west of Marsing; 2,500 feet east and 500 feet south of the northwest corner of section 26, T. 2 S., R. 6 W.; USGS Sheaville 7.5 minute topographic quadrangle; latitude 43 degrees 13 minutes 36 seconds N and longitude 117 degrees 01 minutes 02 seconds W; WGS84 Decimal Degrees 43.2266667 latitude, -117.0172222 longitude.

RANGE IN CHARACTERISTICS:

Mollic epipedon thickness - 30 to 48 cm.
Depth to abrupt textural change - 13 to 36 cm.
Reaction (pH) - neutral or mildly alkaline
Average annual soil temperature - 8.3 to 10.6 degrees C.
Typic xeric moisture regime.

A horizon
Value - 4 or 5 dry, 2 or 3 moist
Chroma - 1 through 3

Bt horizon
Value - 4 through 6 dry, 3 or 4 moist
Chroma - 2 through 4
Texture - C or CL - 35 to 50 percent clay
Rock fragments - 0 to 15 percent

Bq horizon
Hue - 10YR through 5Y
Value - 4 through 7 dry, 4 or 5 moist
Chroma - 2 through 6
Texture - SL, L, or GR-L
Rock fragments - 5 to 35 percent
Effervescence - none or slight (less than 5 percent calcium carbonate) Cementation - none or weak

COMPETING SERIES: These are the Alibi, Coleman, Dry Creek, Lasere, Pomponio, Pritchard, and Tutuilla series. Alibi and Lasere soils are moderately deep to bedrock. Coleman soils have 7.5YR or 5YR hues, 11.1 to 13.3 degrees annual soil temperatures and an average annual precipitation of 560 mm. Dry Creek soils have a calcic horizon at a depth of less than 100 cm. Pomponio soils have a paralithic contact at a moderate depth and an average annual precipitation of 640 to 760 mm. Pritchard soils have 50 to 60 percent clay in the Bt horizon. Tutuilla soils lack secondary silica immediately below the argillic and have an average annual precipitation of 610 to 710 mm.

GEOGRAPHIC SETTING: Succor soils are gently sloping to steep on pediments and landslide deposits at elevations of 1,295to 1,680 meters. Slopes range from 3 to 35 percent. These soils formed in mixed alluvium from volcaniclastic material and lacustrine deposits. The climate is hot and dry in summer and cool and moist in winter. Average annual precipitation ranges from 300 to 380 mm, and average annual temperature ranges from 7.2 to 8.4 degrees C. The frost-free period is 90 to 115 days.

GEOGRAPHICALLY ASSOCIATED SOILS: These are Gooding, Hurryback, and Longcreek series. Gooding soils are on relict outwash fans and have a duripan. Hurryback soils are on steep north and east aspects, have a frigid temperature regime and a fine-loamy particle-size class. Longcreek soils are on south aspects and are shallow to bedrock.

DRAINAGE AND SATURATED HYDRAULIC CONDUCTIVITY: Well drained; medium to very rapid runoff; slow saturated hydraulic conductivity.

USE AND VEGETATION: Succor soils are used mainly for rangeland and wildlife habitat. The dominant natural vegetation is low sagebrush, bluebunch wheatgrass, Idaho fescue and Sandberg bluegrass.

DISTRIBUTION AND EXTENT: Southwestern Idaho. Succor soils are of small extent. MLRA 25.

MLRA SOIL SURVEY REGIONAL OFFICE (MO) RESPONSIBLE: Davis, California

SERIES ESTABLISHED: Owyhee County Area, Idaho, l992.

REMARKS: Diagnostic horizons and other features recognized in this pedon:
Mollic epipedon - zone 0 to 46 cm (The A1, A2, and Btl horizons).
Argillic horizon - The zone 13 to 56 cm (The Btl and Bt2 horizons).
Abrupt textural change - at 13 cm, est. 17 percent clay increase in less than 2.5 cm (upper boundary of Bt1).

Particle-size control section - The zone from 13 to 56 cm (The Btl and Bt2 horizons).

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National Cooperative Soil Survey
U.S.A.