LOCATION CAMPAIR TXEstablished Series
TAXONOMIC CLASS: Fine-loamy, siliceous, active, thermic Typic Haplustalfs
TYPICAL PEDON: Campair loamy sand, on a 2 percent slope, in a coastal bermudagrass pasture. (Colors are for dry soil unless otherwise stated).
Ap--0 to 20 cm (0 to 8 in); light brown (7.5YR 6/4) sand, brown (7.5YR 4/4) moist; weak medium granular structure; soft, very friable; common fine and medium roots; few ferruginous sandstone fragments from 12 to 51 mm (0.5 to 2 in) in diameter; few siliceous gravel less than 25 mm (1 in) in diameter; slightly acid; abrupt smooth boundary.
A--20 to 30 cm (8 to 12 in); brown (7.5YR 4/4) loamy sand, dark brown (7.5YR 3/4) moist; weak medium subangular blocky structure; slightly hard, very friable; few fine roots; few fine pores; few siliceous gravel less than 25 mm (1 in) in diameter; slightly acid; clear smooth boundary. (Combined thickness of the A horizon is 10 to 56 cm [4 to 22 in])
E--30 to 43 cm (12 to 17 in); brown (7.5YR 5/4) loamy sand, brown (7.5YR 4/4) moist; weak medium subangular blocky structure; slightly hard, very friable; few fine roots; few fine pores; few siliceous gravel less than 25 mm (1 in) in diameter; slightly acid; clear smooth boundary. (Thickness of the E horizon is 0 to 20 cm [0 to 8 in])
Bt1--43 to 66 cm (17 to 26 in); reddish yellow (7.5YR 6/6) sandy clay loam, strong brown (7.5YR 5/6) moist; weak coarse prismatic structure parting to moderate medium subangular blocky; very hard, friable; few fine roots; common fine and medium pores; few wormcasts; few thin clay films; few siliceous gravel less than 25 mm (1 in) in diameter; neutral; clear wavy boundary.
Bt2--66 to 86 cm (26 to 34 in); light yellowish brown (10YR 6/4) sandy clay loam, yellowish brown (10YR 5/4) moist; weak coarse prismatic structure parting to moderate medium subangular blocky; very hard, friable; few fine roots; common fine and medium pores; common distinct yellowish red (5YR 5/6) clay films on surface of peds and in pores; many coarse distinct reddish yellow (7.5YR 6/6) and common coarse prominent red (2.5YR 4/6) masses of oxidized iron; few wormcasts; few siliceous gravel less than 25 mm (1 in) in diameter; slightly acid; abrupt smooth boundary. (Combined thickness of the Bt horizon is 45 to 78 cm [18 to 31 in])
R--86 to 111 cm (34 to 44 in); yellowish red (5YR 5/6) and red (2.5YR 5/6) coarse grained strongly cemented sandstone bedrock that contains about 15 to 20 percent imbedded fine siliceous gravel; cementation and shades of red staining mostly expressed in the upper 2.5 cm (1 in).
TYPE LOCATION: Mason County, Texas; From intersection of Texas Highway 29 and U.S. Highway 377, approximately 5 miles west of the town of Mason; approximately 3.7 miles southwest on U.S Highway 377 to private road, 1,200 feet north-northeast in rangeland. Grit USGS topographic quadrangle; Latitude: 30 degrees, 46 minutes, 8.4 seconds N; Longitude: 99 degrees, 21 minutes, 57.6 seconds W; NAD83.
RANGE IN CHARACTERISTICS:
Depth to lithic contact: 50 to 100 cm (20 to 40 in)
Solum thickness: 50 to 100 cm (20 to 40 in)
Combined thickness of A and E horizons: 25 to 50 cm (10 to 20 in)
Particle-size control section (weighted average):
Clay content: 18 to 34 percent
A or Ap horizon
Hue: 7.5YR or 10YR
Value: 5 or 6
Chroma: 3 or 4
Texture: sand, loamy sand, or loamy fine sand
Reaction: moderately acid to neutral
Other features: In pedons where moist value and chroma are 3 or less, the epipedon is not thick enough for a mollic epipedon.
E horizon (where present)
Hue: 7.5YR or 10YR
Value: 5 to 7
Chroma: 3 or 4
Texture: sand, loamy sand, or loamy fine sand
Reaction: moderately acid to neutral
Bt horizon
Hue: 5YR to 10YR
Value: 4 to 7
Chroma: 2 to 6
Redoximorphic features: amount-few to many, shades-red, brown, yellow, or gray, location-in the lower part. In some pedons matrix color is light gray.
Texture: sandy clay loam or clay loam
Reaction: moderately acid to neutral
R layer
Hue: 2.5YR or 5YR
Kind: Cambrian age sandstone bedrock with some layers of metamorphic gneiss and quartzite bedrock.
COMPETING SERIES: These are no competing series in the same family. Similar soils are the
Cisco (TX),.
Davilla (TX),
Knolle (TX),
Minerva (TX)
Newcastle (TX) series and
Vashti (TX)series.
Cisco soils: have sola more than 100 cm (40 in)
Davilla soils: have a udic moisture regime
Knolle and Minerva soils: have an argillic horizon with a base saturation of less than 75 percent throughout
Newcastle soils: have a paralithic contact
Vashti soils: have redoximorphic features associated with wetness within 75 cm (30 in) of the surface
GEOGRAPHIC SETTING:
Parent material: Loamy residuum derived from sandstone bedrock of Cambrian age, primarily of the Hickory Formation. Some pedons have thin layers of gneiss and/or quartzite interbedded.
Landscape: Dissected plateaus of the Central Basin
Landform: Shoulders, backslopes and footslopes of ridges
Slope: 1 to 5 percent
Climate: Dry subhumid
Soil moisture: A typic ustic moisture regime.
Mean annual temperature: 18 to 19 degrees C (65 to 67 degrees F)
Mean annual precipitation: 559 to 711 mm (22 to 28 in)
Frost free period: 207 to 262 days
Elevation: 335 to 580 m (1,100 to 1,900 ft)
Thornthwaite annual P-E indices: 38 to 44
GEOGRAPHICALLY ASSOCIATED SOILS: These are the
Loneoak (TX),
Matilo (TX),
Nebgen (TX), and
Oben (TX) series.
Loneoak soils: have sandy surface layers 50 to 75 cm (20 to 30 in) thick with redoximorphic features associated with wetness at depths less than 75 cm (30 in) and occur on similar positions.
Matilo soils: have sandy surface layers more than 100 cm (40 in) thick and occur on footslopes.
Nebgen soils: are very shallow and occur on summits, shoulders and backslopes of ridges at higher elevations.
Oben soils: are shallow and occur on summits, shoulders and backslopes of ridges at higher elevations.
DRAINAGE AND PERMEABILITY: Well drained. Permeability is moderate. Runoff is very low on 1 to 3 percent slopes, and low on 3 to 5 percent slopes.
USE AND VEGETATION: Used mainly as improved pasture and cropland. Irrigated peanuts are the principal crop. Native vegetation consists of little bluestem, sand bluestem, indiangrass, sideoats grama, sand lovegrass, purpletop, tall dropseed, silver bluestem, Scribner panicum, Texas wintergrass and greenbriar. Trees include blackjack oak and post oak.
DISTRIBUTION AND EXTENT: Central Texas; Southwest Plateaus and Plains Range and Cotton Region, LRR I; MLRA 82-Texas Central Basin. The series is of moderate extent.
MLRA SOIL SURVEY REGIONAL OFFICE (MO) RESPONSIBLE: Temple, Texas
SERIES ESTABLISHED: Llano County, Texas, 1990. The name is from a community in Mason County.
REMARKS: The soil classifies in the active cation exchange activity class.
Diagnostic horizons and features recognized in this pedon are:
Ochric epipedon: 0 to 43 cm (0 to 17 in) (A and E horizons)
Argillic horizon: 43 to 86 cm (17 to 34 in) (Bt1 and Bt2 horizons)
Lithic contact: sandstone at 86 cm (34 in) (R layer)
ADDITIONAL DATA: None
TAXONOMIC VERSION: Keys to Soil Taxonomy, 11th Edition, 2010.