LOCATION ROSANKY TXEstablished Series
TAXONOMIC CLASS: Fine, mixed, semiactive, thermic Ultic Paleustalfs
TYPICAL PEDON: Rosanky fine sandy loam--rangeland. (Colors are for dry soil unless otherwise stated.)
Ap--O to 5 inches; brown (lOYR 5/3) fine sandy loam, dark brown (lOYR 4/3) moist; weak fine granular structure; slightly hard, very friable, slightly sticky and slightly plastic; common fine roots; few fine siliceous pebbles; slightly acid; clear smooth boundary. (4 to 6 inches thick)
E--5 to 8 inches; light brown (7.5YR 6/4) fine sandy loam, brown (7.5YR 5/4) moist; weak fine granular structure; slightly hard, very friable, slightly sticky and slightly plastic; common fine roots; common fine siliceous pebbles; slightly acid; abrupt smooth boundary. (0 to 8 inches thick)
Bt1--8 to 20 inches; red (2.5YR 4/6) clay, dark red (2.5YR 3/6) moist; strong fine angular blocky structure; very hard, firm, sticky and very plastic; few fine roots; continuous thin clay films; strongly acid; gradual smooth boundary. (8 to 18 inches thick)
Bt2--20 to 30 inches; red (2.5YR 5/6) clay, red (2.5YR 4/6) moist; few fine distinct strong brown (7.5YR 5/6) mottles; moderate fine angular blocky structure; very hard, firm, sticky and very plastic; few fine roots; continuous thin clay films; strongly acid; gradual wavy boundary. (8 to 18 inches thick)
BCt1--30 to 46 inches; reddish yellow (5YR 6/6) sandy clay loam; yellowish red (5YR 5/6) moist; weak fine and medium subangular blocky structure; hard, friable, sticky and plastic; few fine roots; common thin clay films; strongly acid; gradual wavy boundary. (6 to 18 inches thick)
BCt2--46 to 56 inches; reddish yellow (5YR 6/6) fine sandy loam; yellowish red (5YR 5/6) moist; weak fine subangular blocky structure; hard, friable, sticky and plastic; few fine roots; common thin clay films; strongly acid; gradual wavy boundary. (0 to 16 inches thick)
C--56 to 64 inches; reddish yellow (5YR 6/6) fine sandy loam; yellowish red (5YR 5/6) moist; common medium distinct brownish yellow (lOYR 6/6) and gray (lOYR 6/1) mottles; massive; very hard, friable; few fine roots and few clay films along fractures; strongly acid; clear wavy boundary. (0 to 20 inches thick)
Cr--64 to 70 inches; gray and yellowish brown stratified weakly consolidated sandstone; extremely firm, extremely hard; moderately acid.
TYPE LOCATION: Bastrop County, Texas; approximately 17 miles south of Bastrop to the intersection of Farm Market Road 535 and Texas Highway 304; south on Highway 304 2.7 miles to county road; south on county road 0.7 mile; point is located 50 feet east of road.
RANGE IN CHARACTERISTICS: Solum thickness ranges from 40 to 60 inches and depth to a paralithic contact of sandstone ranges from 60 to 80 inches. The sandstone is weakly or strongly consolidated. The argillic horizon has 0 to about 5 percent by volume of sandstone or ironstone fragments or thin discontinuous layers. Redoximorphic features in shades of brown, red, and yellow are considered to be lithochromic.
The A and E horizons are loamy fine sand, fine sandy loam, or their gravelly or very gravelly counterparts. The A horizon has hue of 5YR to lOYR, value of 4 or 5, and chroma of 2 to 4.
The E horizon has hue of 5YR to lOYR, value of 5 to 7, and chroma of 2 to 4. Reaction of the A and E horizons ranges from strongly acid to slightly acid, unless limed. The epipedon has sandstone and ironstone pebbles that comprise 0 to 50 percent by volume. Siliceous pebbles range from 0 to 10 percent in some pedons.
The Bt1 and Bt2 horizons have colors in hue of 2.5YR or 5YR, with value of 4 to 6, and chroma of 6 or 8. Mottles in shades of brown, red or yellow range from none to few. Texture is sandy clay or clay averaging 35 to 50 percent clay in the control section, with the clay content decreasing 20 to 50 percent of the maximum within a depth of 60 inches. Reaction is strongly acid or moderately acid.
The BCt and C horizons have colors in shades of red, yellow or brown with hue of 2.5YR to lOYR, value of 5 to 7, and chroma of 6 or 8. Mottles in shades of red, brown, yellow or gray range from none to a mottled matrix. They are fine sandy loam, sandy clay loam, or clay loam. Reaction is strongly acid or moderately acid.
The Cr horizon is weakly or strongly consolidated sandstone. Colors are typically in shades of brown, red or gray. It is typically fine sandy loam or sandy clay loam, and is extremely hard when dry. Some pedons have discontinuous ironstone strata or fragments. Clay films are along fractures in pedons. Reaction is commonly strongly acid or moderately acid.
COMPETING SERIES: These include the Birome, Bonti, Darst, Gause, Jedd, Spiller, and Travis series. All these soils except Gause, Spiller and Travis soils have sola less than 40 inches thick. Gause soils have Bt horizons with hue of 7.5YR or lOYR. Spiller soils have colors in hue of lOYR in the upper argillic. Travis soils are underlain with ancient gravelly alluvium at depths of 50 to 70 inches.
GEOGRAPHIC SETTING: Rosanky soils are on convex gently sloping to moderately sloping ridgetops. The soil formed in weakly consolidated sandstone or packsand with or without loamy or clayey strata, mainly of the Weches and Reklaw Formations , and a sandstone member of the Cook Mountain Formation. Slope gradients are 1 to 8 percent. Mean annual precipitation ranges from 32 to 40 inches, and mean annual temperature ranges from 64 to 68 degrees F. Frost free days range from 240 to 280 days, and elevation ranges from 250 to 650 feet. Annual P-E index ranges from 44 to 66.
GEOGRAPHICALLY ASSOCIATED SOILS: These include the competing Jedd series, and the Margie, Gasil, and Stidham series. Jedd soils have sola less than 40 inches thick. Margie soils have base saturation greater than 75 percent in the argillic horizon. Gasil have fine-loamy control sections. Stidham soils have arenic surface layers. Jedd soils are on greater slopes but in similar landscapes. Margie soils are on similar positions. Gasil and Stidham soils are on lower positions and on smoother topography.
DRAINAGE AND PERMEABILITY: Well drained. Permeability is moderately slow. Runoff is very low on 1 to 3 percent slopes, low on 3 to 5 percent slopes, and medium on 5 to 8 percent slopes.
USE AND VEGETATION: Mostly post oak, blackjack oak, cedar, and Yaupon trees with little bluestem, annual grasses, and weeds. Minor areas of idle cropland and bermudagrass used as pasture.
DISTRIBUTION AND EXTENT: Mainly in east-central Texas (MLRA 87A). The series is of minor extent.
MLRA SOIL SURVEY REGIONAL OFFICE (MO) RESPONSIBLE: Temple, Texas
SERIES ESTABLISHED: Caldwell County, Texas; 1972.
REMARKS: Semiactive cation exchange activity class. Diagnostic horizons and features recognized in this pedon are:
Ochric epipedon - 0 to 8 inches. (Ap horizon)
Argillic horizon - 8 to 56 inches. (Bt and BCt horizons)
Ultic feature - base saturation of 45 to 75 percent throughout argillic horizon.
Paralithic contact - At 64 inches
Soil Interpretation Record Number: TX0543; GRADED TX1220