LOCATION JUSTIN TX+OKEstablished Series
TAXONOMIC CLASS: Fine-loamy, mixed, active, thermic Udic Paleustolls
TYPICAL PEDON: Justin fine sandy loam--pasture. (Colors are for dry soil unless otherwise stated.)
Ap--0 to 5 inches; brown (7.5YR 5/2) fine sandy loam, dark brown (7.5YR 3/2) moist; weak medium subangular blocky structure; hard, friable; many fine roots; few fine pores; few fine nodules of ironstone; slightly acid; abrupt smooth boundary. (4 to 8 inches thick)
A1--5 to 12 inches; brown (7.5YR 5/2) fine sandy loam, dark brown (7.5YR 3/2) moist; moderate medium subangular blocky and granular structure; slightly hard, friable; many fine roots; common fine pores; common wormcasts; few fine nodules of ironstone; slightly acid; clear wavy boundary. (7 to 10 inches thick)
Bt1--12 to 17 inches; reddish brown (5YR 5/4) sandy clay loam, reddish brown (5YR 4/4) moist; few fine faint red mottles; moderate medium subangular blocky structure; hard, friable; many fine roots; few fine pores; few discontinuous clay films on faces of peds; few fine nodules of ironstone; slightly acid; gradual smooth boundary. (4 to 14 inches thick)
Bt2--17 to 33 inches; reddish yellow (7.5YR 6/6) clay loam, strong brown (7.5YR 5/6) moist; common medium distinct red (2.5YR 4/6) redoximorphic concentrations; moderate medium subangular blocky and fine blocky structure; hard, friable; common fine roots; distinct clay films on faces of peds; neutral; gradual smooth boundary. (6 to 34 inches thick)
Bt3--33 to 80 inches; brownish yellow (10YR 6/6) clay loam, yellowish brown (10YR 5/6) moist; common medium distinct yellowish red (5YR 5/6) redoximorphic concentrations; moderate medium blocky and subangular blocky structure; hard, friable; few fine roots; continuous clay films on faces of peds; few soft masses of calcium carbonate in the lower part; slightly alkaline.
TYPE LOCATION: Denton County, Texas; about 8 miles northeast of Denton, Texas; on FR 428 to intersection of FR 2153; then 2.2 miles north on FR 2153, and 300 feet west into pasture.
RANGE IN CHARACTERISTICS: Solum thickness ranges from 60 to more than 80 inches. Depth to soft masses of calcium carbonate ranges from 36 to more than 70 inches. Content of fine nodules and fragments of ironstone ranges from none to about 5 percent throughout the solum.
The A horizon is dark grayish brown (10YR 4/2) or brown (10YR 4/3; 7.5YR 5/2, 4/2). It is loam or fine sandy loam and slightly acid to neutral.
The Bt1 horizon is brown (10YR 5/3; 7.5YR 4/2, 5/4), yellowish brown (10YR 5/4, 5/6), pale brown (10YR 6/3), light yellowish brown (10YR 6/4), strong brown (7.5YR 5/6), yellowish red (5YR 5/6, 5/8), or reddish brown (5YR 5/3, 5/4). Redoximorphic concentrations of dark red (2.5YR 3/6), red (2.5YR 4/6), yellowish red (5YR 4/6), or strong brown (7.5YR 5/6) range from none to common. It is sandy clay loam, loam, or clay loam with clay content ranging from 24 to 35 percent. Reaction is slightly acid or neutral.
The Bt2 horizon is brown (10YR 5/3; 7.5YR 5/4), grayish brown (10YR 5/2; 2.5Y 5/2), light olive brown (2.5Y 5/4), yellowish brown (10YR 5/4, 5/6), strong brown (7.5YR 5/6), reddish yellow (7.5YR 6/6; 5YR 6/6), reddish brown (5YR 5/4), or yellowish red (5YR 5/6). It has common coarse red, yellowish red, or reddish yellow redoximorphic concentrations if hues are 10YR or yellower. Texture is clay loam or sandy clay loam. Clay content ranges from 24 to 40 percent. Reaction is slightly acid through slightly alkaline.
The Bt3 horizons have redoximorphic concentrations in colors of red, yellowish red, brown, strong brown, yellowish brown, or olive brown. Some pedons have redoximorphic depletions with chroma of 2 or less below a depth of 40 inches. Texture is clay loam or clay. Some pedons have C horizons of with redoximorphic features of brown, red, brownish gray, or gray, and have textures of sandy clay, sandy clay loam, or shaly clay below 60 inches depth. Reaction ranges from slightly acid to moderately alkaline.
COMPETING SERIES: These include the Anocon, Blum, Bonham, Chickasha, Durant, Frankirk, Lawton, Motley, Norge, Scullin, Stoneburg, Teller, and Zaneis series. Anocon, Blum, Bonham, Durant, Frankirk, Lawton, and Scullin soils have more than 35 percent clay in the control section. Chickasha and Zaneis soils have a solum thickness of 40 to 60 inches and are underlain by sandstone. Motley and Teller soils lack mottling in the B2t horizons. Norge soils have fine-silty control sections. Stoneburg soils have a solum thickness of 20 to 40 inches over sandstone.
GEOGRAPHIC SETTING: Justin soils are on nearly level to gently sloping uplands. Slopes range from 0 to 5 percent but are dominantly less than 4 percent. These soils formed in alkaline clayey and loamy sediments. The mean annual temperature ranges from 64 degrees to 68 degreesF. The average annual rainfall ranges from 26 to 34 inches. Thornthwaite P-E indices range from 48 to 60. Frost free days range from 210 to 240. Elevation ranges from 500 to 1000 feet.
GEOGRAPHICALLY ASSOCIATED SOILS: These are the Crockett, Gasil, Normangee, and Wilson series. Crockett, Normangee, and Wilson soils have more than 35 percent clay in the control section. Gasil soils have ochric epipedons and siliceous mineralogy.
DRAINAGE AND PERMEABILITY: Well drained; runoff is low on 0 to 1 percent slopes and medium on 1 to 5 percent slopes; moderately slow permeability.
USE AND VEGETATION: Most of the Justin soils were cultivated but are now in improved pasture. A few areas are planted to peanuts, small grain, or grain sorghum. Native vegetation is little bluestem, indiangrass, Texas wintergrass, and meadow dropseed. Woody vegetation is scattered post oak and mesquite.
DISTRIBUTION AND EXTENT: Mainly north central Texas. The series is moderately extensive.
MLRA SOIL SURVEY REGIONAL OFFICE (MO) RESPONSIBLE: Temple, Texas
SERIES ESTABLISHED: Denton County, Texas; 1975.
REMARKS: Justin soils were formerly classified in Reddish Prairie great soil group and included in the Bonham series.