LOCATION WINDTHORST TX+OKEstablished Series
TAXONOMIC CLASS: Fine, mixed, active, thermic Udic Paleustalfs
TYPICAL PEDON: Windthorst fine sandy loam--wooded pasture. (Colors are for dry soil unless otherwise stated.)
A--0 to 4 inches; grayish brown (10YR 5/2) fine sandy loam, very dark grayish brown (10YR 3/2) moist; weak fine subangular blocky structure parting to weak fine granular soft, very friable; many fine and medium roots; slightly acid; clear smooth boundary. (2 to 7 inches thick)
E--4 to 10 inches; light yellowish brown (10YR 6/4) fine sandy loam, yellowish brown (10YR 5/4) moist; weak fine subangular blocky structure; soft, very friable; many fine and medium roots; slightly acid; abrupt smooth boundary. (0 to 12 inches thick)
Bt1--10 to 18 inches; red (2.5YR 4/6) sandy clay; red (2.5YR 4/6) moist; strong fine and medium blocky structure; extremely hard, very firm; common fine roots; nearly continuous reddish brown (5YR 4/3) clay films on faces of most peds; moderately acid; gradual smooth boundary. (4 to 18 inches thick)
Bt2--18 to 38 inches; yellowish red (5YR 5/6) sandy clay, yellowish red (5YR 4/6) moist; many medium faint strong brown (7.5YR 5/6) redoximorphic concentrations, many fine distinct brownish yellow (10YR 6/6) redoximorphic concentrations; moderate coarse blocky structure; extremely hard, very firm; few fine roots; common discontinuous clay films on faces of peds; moderately acid; gradual wavy boundary. (6 to 22 inches thick)
BC--38 to 50 inches; coarsely and prominently mottled brownish yellow (10YR 6/6) and strong brown (7.5YR 5/6) sandy clay loam, with few medium reddish yellow (5YR 6/6) redoximorphic concentrations; moderate coarse blocky structure; extremely hard, very firm; few fine roots; faces of peds are coated with brown thin clay films; slightly acid; gradual wavy boundary. (5 to 18 inches thick)
C1--50 to 60 inches; light gray (5Y 7/2) sandy clay loam; massive; hard, firm; few fine roots; common soft masses of calcium carbonate; moderately alkaline; clear wavy boundary. (0 to 15 inches thick)
C2--60 to 70 inches; very pale brown (10YR 8/3) weakly cemented, slightly acid sand (packsand) interbedded with light gray (5Y 7/2) calcareous clay; massive; the packsand is hard dry, but is friable when moist; few fine roots.
TYPE LOCATION: Parker County, Texas; 5.2 miles southwest of the Parker County Courthouse in Weatherford, Texas, via U.S. Highway 80; 800 feet southwest of the junction with Dennis road in wooded pasture, 150 feet north of U.S. Highway 80.
RANGE IN CHARACTERISTICS: Solum thickness ranges from 40 to about 60 inches. Siliceous or ironstone pebbles range from none to 8 percent by volume in some horizons. Base saturation ranges from 75 to 90 percent, by sum of cations, in some part of the argillic horizon. The average clay content of the control section ranges from 35 to 45 percent.
The A horizon has hue of 7.5YR or 10YR, value of 5 to 6 and chroma of 2 to 4. The E horizon has colors with 1 or 2 value and chroma greater than the A horizon. The texture of the A and E horizons is fine sandy loam, very fine sandy loam, loamy very fine sand, or loamy fine sand. Their reaction ranges from moderately acid to neutral.
The Bt horizon has hue of 2.5YR to 7.5YR, value of 4 or 5, and chroma of 3 to 8. Prominent redoximorphic concentrations in shades of yellow, brown, or red range from few to many in the Bt2 or lower Bt horizons. Some pedons have grayish redoximorphic depletions below a depth of 30 inches. Texture is clay, sandy clay, or clay loam. It is clay loam in the lower part of some pedons. The reaction is moderately acid or slightly acid in the Bt1 horizon and ranges from moderately acid to neutral in lower Bt horizons.
The BC horizon has redoximorphic concentrations in shades or red, yellow, and brown with or without fragments or discontinuous strata of grayish sandstone or shaly materials. The texture is sandy clay, clay loam, or sandy clay loam. It is moderately acid to moderately alkaline and some pedons contain films, threads, or soft masses of calcium carbonate.
The C horizon has colors mainly in shades of brown, gray, and yellow or is stratified with these colors. Some pedons have reddish or pinkish splotches or strata. The texture is sandy clay loam, clay loam, fine sandy loam, or shale with a clay texture stratified with loamy materials. Commonly it grades to weakly cemented packsand stratified with loamy or clayey materials. This material does not exclude roots which range from few to common. The reaction ranges from moderately acid to moderately alkaline with calcareous spots or strata in some pedons.
COMPETING SERIES: These are the Callisburg, Chigley, Cona, Edge, Hamby, Margie, Minwells, Truce and Voca, series. Callisburg, Hamby and Margie soils have a sola thicker than 60 inches. Chigley soils are gravelly and are underlain by conglomerate bedrock below a depth of 60 inches. Cona soils gave sola 20 to 40 inches thick. Edge soils have high shrink swell properties in the upper horizon and are in a more moist climate. Minwells soils are underlain by beds of sand and gravel below a depth of 40 inches. Truce soils are well drained and do not have prominate redoximoprhic features in the Bt horizons. Voca soils have an argillic horizon which has a lithic contact of granite.
GEOGRAPHIC SETTING: Windthorst soils are on erosional uplands. Soil areas are convex; slope gradients are dominantly from 3 to 5 percent, but range from 1 to 12 percent. Some of the steeper areas are dissected by gullies. The soil formed in stratified clay, weakly cemented packsands, and loamy materials of Lower Cretaceous age. The climate is dry subhumid. The average annual precipitation ranges from 26 to 32 inches, the mean annual temperature ranges from 62 to 66 degrees F., and Thornthwaite P-E indices from 38 to 52. Frost free period is 220 to 240 days and elevation ranges from 700 to 1300 feet.
GEOGRAPHICALLY ASSOCIATED SOILS: These are the competing Chigley series and the Chaney, Darnell, Demona, Duffau, Keeter, Nimrod, Selden, and Stephenville series. Chaney, Demona, Nimrod, and Selden soils have low chroma wetness mottles in the Bt horizon. In addition, Demona and Nimrod soils have sandy surface layers 20 to 40 inches thick. These soils are in lower positions. Darnell soils are less than 20 inches thick. Darnell, Keeter, and Stephenville soils are on slightly higher positions. Duffau and Stephenville soils have fine-loamy control sections. Keeter soils have fine-silty control sections with sola thickness of 20 to 40 inches.
DRAINAGE AND PERMEABILITY: Moderately well drained; runoff is medium on 1 to 5 percent slopes and high on 5 to 12 percent slopes; moderately slow internal drainage and permeability.
USE AND VEGETATION: Some areas are cultivated; peanuts, sorghums, and small grains are the main crops. Most areas are in pastures of bermudagrass or in rangeland. Native vegetation is post oak and blackjack oak trees with a ground cover of little bluestem, greenbrier, and annual grasses.
DISTRIBUTION AND EXTENT: North-central Texas and south-central Oklahoma. The soil is of large extent.
MLRA OFFICE RESPONSIBLE: Temple, Texas
SERIES ESTABLISHED: Archer County, Texas; 1912.
REMARKS: Diagnostic horizons and features recognized in this pedon are:
Ochric epipedon - 0 to 10 inches.
Argillic horizon - 10 to 50 inches.
Udic feature - The base saturation is greater than 75 percent in some part of the argillic horizon.
ADDITIONAL DATA: Typical pedon S74TX3671, NSSL Laboratory Sample Nos. 74L30374L310.