LOCATION CAMPWOOD TXEstablished Series
TAXONOMIC CLASS: Fine, smectitic, thermic Typic Haplusterts
TYPICAL PEDON: Campwood clay loam--rangeland.
(Colors are for dry soil unless otherwise stated).
Ap--0 to 7 inches; dark grayish brown (10YR 4/2) clay, very dark grayish brown (10YR 3/2) moist; moderate fine and medium subangular blocky structure; very hard, firm, sticky, very plastic; many very fine and fine roots; common very fine and fine interstitial and tubular pores; about 3 percent subrounded limestone pebbles that are concentrated at base of horizon; strongly effervescent; moderately alkaline; abrupt wavy boundary. (4 to 10 inches thick)
Bw--7 to 19 inches; dark grayish brown (10YR 4/2) clay, very dark grayish brown (10YR 3/2) moist; moderate medium prismatic structure parting to moderate fine and medium angular blocky; very hard, firm, sticky, very plastic; common very fine and fine roots; common very fine and fine tubular pores; about 5 percent subrounded limestone pebbles; about 5 percent stress surfaces on vertical and horizontal surfaces of peds, mainly in lower part of horizon; strongly effervescent; moderately alkaline; gradual wavy boundary. (4 to 20 inches thick)
Bss1--19 to 33 inches; dark grayish brown (10YR 4/2) clay, very dark grayish brown (10YR 3/2) moist; moderate medium prismatic structure parting to moderate fine and medium angular blocky; very hard, firm; very sticky and very plastic; common very fine and fine roots; common very fine tubular pores; about 2 percent of vertical ped surfaces are coated with A material from above; few slickensides dip to 20 degrees and about 20 percent of aggregates are pressure faces and wedge-shaped peds; about 1 percent subrounded limestone pebbles; strongly effervescent; moderately alkaline; gradual wavy boundary.
Bss2--33 to 47 inches; 65 percent dark grayish brown (10YR 4/2) and 35 percent brown (7.5YR 5/3) clay, very dark grayish brown (10YR 3/2) and brown (7.5YR 4/3) moist; moderate coarse prismatic structure parting to moderate medium and coarse angular blocky; very hard, very firm, very sticky, very plastic; common very fine and fine roots; common very fine tubular pores; few vertical cracks about 5 mm thick are filled with material from above; about 25 percent of aggregates are wedge-shaped peds; common slickensides dip to 45 degrees; slickensides grade into stress surfaces; about 5 percent subrounded limestone pebbles; strongly effervescent; moderately alkaline; gradual wavy boundary.
Bss3--47 to 62 inches; 60 percent brown (7.5YR 5/3) and 40 percent dark grayish brown (10YR 4/2) clay, brown (7.5YR 4/3) and very dark grayish brown (10YR 3/2) moist; weak coarse prismatic structure parting to moderate medium and coarse angular blocky; very hard, firm, very sticky, very plastic; common very fine and fine roots matted between peds and along slickensides; common very fine tubular pores; common continuous slickensides that are grooved and polished; dark streaks 2 to 10 mm wide aligned along vertical faces of prisms; about 30 percent of aggregates are wedge-shaped peds; about 1 percent subrounded limestone pebbles; strongly effervescent; moderately alkaline;
gradual wavy boundary.
Bss4--62 to 76 inches; 85 percent brown (7.5YR 5/3) and 15 percent dark grayish brown (10YR 4/2) silty clay, brown (7.5YR 4/3) and very dark grayish brown (10YR 3/2) moist; moderate coarse prismatic structure parting to moderate medium and coarse angular blocky; very hard, very firm, very sticky, very plastic; few very fine to coarse roots matted along slickensides and between peds; common very fine and fine tubular pores; common continuous slickensides dip 30 to 45 degrees and are grooved and polished; 10 percent very dark gray (10YR 3/1) moist surface coats 2 to 10 mm thick on slickensides; about 20 percent of aggregates are wedge-shaped peds; about 1 percent subrounded limestone pebbles; strongly effervescent; moderately alkaline; gradual wavy boundary.
Bss5--76 to 85 inches; 95 percent brown (7.5YR 5/3) and 5 percent dark grayish brown (10YR 4/2) clay, brown (7.5YR 4/3) and very dark grayish brown (10YR 3/2) moist; moderate coarse prismatic structure parting to moderate medium and coarse angular blocky; very hard, very firm, very sticky, very plastic; common very fine roots between peds; common very fine and fine tubular pores; common continuous slickensides dip 10 to 45 degrees and are grooved and polished; 10 percent very dark gray (10YR 3/1) moist surface coats 2 to 10 mm thick on slickensides; 20 percent of aggregates are wedge-shaped peds; few termite chambers up to 2 centimeters in diameter; about 1 percent limestone pebbles; strongly effervescent; moderately alkaline. (combined thickness of Bss horizon ranges from 40 to more than 80 inches)
TYPE LOCATION: Edwards County, Texas; From the intersection of Texas Highway 55 and Church Street in Barksdale; 2.4 miles west on county road to Pulliam Creek; 2.4 miles west on county road; 1.05 miles south to gate; 140 feet south and 160 feet west in rangeland. Quadrangle Name: Camp Wood, Texas. (Latitude: 29 degrees 41 minutes 54 seconds North; Longitude: 100 degrees 6 minutes 6 seconds West) Elevation: 1,630 feet.
RANGE IN CHARACTERISTICS: Solum thickness is more than 80 inches. The soil, when dry, has cracks 0.2 to 1.5 inches wide that extend from the surface to 48 inches. In some pedons the cracks may not open to the surface. These soils have little or no gilgai microrelief. The depth to slickensides or wedge-shaped aggregates is 15 to 40 inches. Thickness of the horizons having mollic moist value and chroma of less than 3.5 is 14 to 50 inches. The 10 to 40 inch control section has a texture of silty clay or clay containing 40 to 60 percent clay. Limestone pebbles range from 0 to 10 percent. The soil has less than 40 percent calcium carbonate equivalent in the control section but ranges to 50 percent in the lower part of the soil. Visible forms of calcium carbonate range from 0 to 5 percent.
The A horizon has hue of 7.5YR or 10YR, value of 3 to 5, and chroma of 1 to 3. Texture is clay loam, silty clay loam, silty clay, or clay with clay content ranging from 35 to 55 percent. Reaction is slightly alkaline or moderately alkaline. Some pedons are noncalcareous.
The Bw horizon has hue of 7.5YR or 10YR, value of 3 to 5 and chroma of 1 to 3. Texture is silty clay or clay with clay content of 40 to 60 percent. Reaction is slightly alkaline or moderately alkaline. The Bss horizon has hue of 5YR to 10YR, value of 4 to 6, and chroma of 2 to 4. Concretions and powdery masses of calcium carbonate range from none to 10 percent. Texture is silty clay or clay in the upper part of the subsoil with clay content of 40 to 60 percent. Texture is silty clay loam, silty clay or clay in the lower part of the subsoil with clay content of 35 to 60 percent. Calcium carbonate equivalent ranges from 20 to 40 percent in the upper subsoil but ranges to 50 percent in the lower part. Reaction is slightly alkaline or moderately alkaline.
COMPETING SERIES: These are the Hollister, Indiahoma, Irion, Leeray, Lockney, Roscoe, and Teagard series. Hollister soils do not have coarse fragments of limestone in the upper part of the solum and have cooler mean annual temperature. Indiahoma soils formed in Permian age sediments, have linear shaped microhighs and have cooler mean annual temperature. Irion soils have indurated platy limestone at 60 to 80 inches. Leeray soils have SAR of 8 to more than 15 within 40 inches of the surface. Lockney soils are moderately well drained, formed in eolian sediments of the High Plains, and have cooler mean annual temperature. Roscoe soils are in flat to slightly depressional areas and are moderately well drained. Teagard soils are less than 40 inches thick over claystone.
GEOGRAPHIC SETTING: Campwood soils are on nearly level to gently sloping stream terraces and alluvial plains in filled valleys from sediments derived from Cretaceous age geological materials. Slope shape is plane to slightly convex and ranges from 0 to 3 percent. The soil formed in unconsolidated calcareous, clayey sediments deposited probably during the Pleistocene age. Mean annual precipitation ranges from 25 to 32 inches and mean annual temperature ranges from 65 to 70 degrees F. Frost-free season ranges from 230 to 250 days and elevation ranges from 1,000 to 2,000 feet. Thornthwaite P-E indices ranges from 34 to 44.
GEOGRAPHICALLY ASSOCIATED SOILS: These are the Anhalt, Crawford, Denton, Dev, Dina, Eckrant, Oakalla, and Tarrant series. Denton soils are on similar landscape positions. Anhalt, Crawford, and Dina soils are moderately deep over limestone bedrock and Dina soils have more than 35 percent coarse fragments. Dev and Oakalla soils occur at lower elevations in flood plains and do not have vertic properties. Eckrant and Tarrant soils are on higher landscape positions, have sola less than 20 inches thick over limestone bedrock and contain more than 35 percent coarse fragments.
DRAINAGE AND PERMEABILITY: The soil is well drained. Runoff is low on slopes less than 1 percent and medium on 1 to 3 percent slopes. Permeability is slow.
USE AND VEGETATION: Most areas of these soils are used as rangeland. The remainder is used for cropland, orchardland, or wildlife land. The major crops are forage sorghums and small grains. Native vegetation includes Live oak, mesquite, pecan, agarito, green condalia, persimmon, ashe juniper, curly mesquite, Texas wintergrass, threeawn, Hall's panicum, red grama, yellow Indiangrass, sideoats grama, silver bluestem, little bluestem and big bluestem.
DISTRIBUTION AND EXTENT: Eastern Edwards Plateau (MLRA 81C) of Southwest Texas. The series is of moderate extent.
MLRA OFFICE RESPONSIBLE: Temple, Texas.
SERIES ESTABLISHED: Edwards County, Texas; 2000.
REMARKS: This series includes some soils formerly included with the Krum series.
Diagnostic horizons and features recognized in this pedon are:
Mollic epipedon - 0 to 47 inches (Ap, Bw, Bss1 and Bss2 horizons)
Cambic horizon - 47 to 85 inches (Bss3, Bss4 and Bss5 horizons)
Slickensides - 19 to 85 inches (Bss horizons)
Vegetative Site: Clay Loam PE 44+ (081CY357TX).
ADDITIONAL DATA: NSSL Data from Edwards County, TX (S91TX-137-003).
TAXONOMIC VERSION: Soil Taxonomy, Second Edition, 1999.