LOCATION TEXROY TX+OKEstablished Series
TAXONOMIC CLASS: Fine-loamy, mixed, superactive, thermic Pachic Argiustolls
TYPICAL PEDON: Texroy loam, on a north-facing, slightly concave, terrace in a draw, 1.5 percent slope in rangeland at an elevation of about 2,928 feet. (Colors are for dry soil unless otherwise stated.)
A--0 to 8 inches; dark grayish brown (10YR 4/2) loam, very dark grayish brown (10YR 3/2) moist; moderate very fine granular structure; hard, friable; many very fine and fine roots; many wormcasts; neutral; clear smooth boundary. (6 to 15 inches thick)
Bt1--8 to 16 inches; dark grayish brown (10YR 4/2) loam, very dark grayish brown (10YR 3/2) moist; moderate very coarse prismatic structure parting to moderate fine subangular blocky; hard, friable, many very fine roots; many very fine tubular pores; many wormcasts; few faint clay films on ped surfaces; slightly alkaline; gradual smooth boundary. (5 to 15 inches thick)
Bt2--16 to 24 inches; brown (10YR 4/3) loam, dark brown (10YR 3/3) moist; moderate coarse prismatic structure parting to weak medium subangular blocky; hard, friable; many very fine roots; many very fine and fine tubular pores; many wormcasts; few faint clay films on ped surfaces; moderately alkaline; gradual smooth boundary. (5 to 15 inches thick)
Bt3--24 to 42 inches; brown (7.5YR 5/3) loam, brown (7.5YR 4/3) moist; moderate very coarse prismatic structure parting to weak medium subangular blocky; hard, friable; common very fine roots; common very fine and fine tubular pores; common wormcasts; few faint clay films on ped surfaces; few films and filaments of calcium carbonate on ped surfaces and in pores; strongly effervescent; moderately alkaline; gradual smooth boundary. (10 to 20 inches thick)
Bt4--42 to 52 inches; brown (7.5YR 5/3) loam, brown (7.5YR 4/3) moist; moderate very coarse prismatic structure parting to weak medium subangular blocky; hard, friable; few very fine roots; common very fine and fine tubular pores; few faint clay films on ped surfaces; few films and filaments of calcium carbonate on ped surfaces and in pores; strongly effervescent; moderately alkaline; clear smooth boundary. (5 to 15 inches thick)
Btk--52 to 65 inches; brown (7.5YR 5/4) loam, brown (7.5YR 4/4) moist; moderate coarse prismatic structure parting to weak fine subangular blocky; hard, friable; common very fine and fine tubular pores; few faint clay films on ped surfaces; estimated 5 percent calcium carbonate by volume in the form of filaments, masses, and nodules; violently effervescent; moderately alkaline; gradual smooth boundary. (10 to 20 inches thick)
2Bw--65 to 80 inches; brown (7.5YR 5/4) fine sandy loam, brown (7.5YR 4/4) moist; weak very coarse prismatic structure; hard, friable; common very fine and fine tubular pores; few films and filaments of calcium carbonate on ped surfaces and in pores; strongly effervescent; moderately alkaline.
TYPE LOCATION: Roberts County, Texas; 1.1 miles north of the Gray County line on Farm Road 282, then 15.1 miles north on a county road, 75 feet west in rangeland. This location is 75 feet west of the southwest corner of a field and about 0.9 miles northwest of the Morrison Ranch headquarters; Latitude: 35 degrees, 50 minutes, 29 seconds N; Longitude: 101 degrees, 01 minutes, 32 seconds W; Adobe Creek SE, Texas USGS quad; NAD 27.
RANGE IN CHARACTERISTICS:
Soil moisture: An ustic moisture regime bordering on aridic. The soil moisture control section is dry in some or all parts for more than 180 but less than 205 days, cumulative, in normal years. July through August and December through February are the driest months. These soils are intermittently moist in September through November and March through June.
Mean annual soil temperature: 57 to 63 degrees F
Depth to secondary carbonates: 15 to 25 inches.
Depth to calcic horizon: 40 to 60 inches.
Thickness of the mollic epipedon: 20 to 40 inches.
Solum thickness: more than 80 inches.
Particle size control section: 18 to 35 percent silicate clay.
Note: Some pedons have buried darkened layers below 40 inches; also, some pedons have sandy or gravelly strata below 60 inches.
Ap horizon:
Hue: 7.5YR or 10YR
Value: 4 or 5 dry, 2 or 3 moist
Chroma: 3 or 4
Texture: loam, clay loam, silt loam
Effervescence: none to slight
Reaction: neutral to slightly alkaline
Bw horizon: (where present)
Hue: 7.5YR or 10YR
Value: 4 or 5 dry, 3 or 4 moist
Chroma: 2 or 3
Texture: loam, silt loam, clay loam
Effervescence: none to slight
Reaction: neutral to slightly alkaline
Upper Bt horizon:
Hue: 7.5YR or 10YR
Value: 4 or 5 dry, 3 or 4 moist
Chroma: 2 or 3
Texture: loam, sandy clay loam, clay loam
Calcium carbonate equivalent: 0 to 5 percent
Effervescence: none to slight
Reaction: slightly or moderately alkaline
Lower Bt horizon:
Hue: 7.5YR or 10YR
Value: 4 to 6 dry, 3 to 5 moist
Chroma: 3 to 6
Texture: loam, sandy clay loam, clay loam
Visible secondary calcium carbonate: less than 2 percent as films or filaments.
Calcium carbonate equivalent: 0 to 8 percent
Effervescence: none to strong
Reaction: slightly or moderately alkaline
Btk horizon:
Hue: 5YR to 10YR
Value: 5 to 7 dry, 4 to 6 moist
Chroma: 4 to 6
Texture: loam, sandy clay loam, clay loam
Visible secondary calcium carbonates: 10 to 20 percent in the form of films, filaments, masses, and nodules.
Calcium carbonate equivalent: 10 to 25 percent
Effervescence: violent
Reaction: moderately alkaline
2Bw horizon (where present):
Hue: 5YR or 7.5YR
Value: 5 to 7 dry, 4 to 6 moist
Chroma: 4 to 6
Texture: fine sandy loam, loamy fine sand
Visible calcium carbonates: none to few in the form of films and filaments.
Calcium carbonate equivalent: 0 to 8 percent
Effervescence: none to strong
Reaction: slightly or moderately alkaline
COMPETING SERIES: These are the
Altus,
Cuero,
Hackey,
Smithville,
Tipton, and
Uvas series of the same family. Similar soils also include the
Bippus,
Paloduro, and
Sprone series.
Altus, Cuero, Smithville, and Tipton series: have a typic-ustic soil moisture regime and are moist for longer periods of time.
Bippus series: have cambic horizons and do not have argillic or calcic horizons.
Farnum series: have an average annual soil temperature of less than 59 degrees F.
Hackey and Uvas series: have an aridic-ustic soil moisture regime and are dry for longer periods of time.
Paloduro and Sprone series: have a mollic epipedon less than 20 inches thick and do not have an argillic horizon.
GEOGRAPHIC SETTING:
Parent material: calcareous, loamy alluvial sediments derived from the upper part of the Ogallala Formation of Miocene-Pliocene age.
Landform: nearly level to very gently sloping terraces along the Canadian and Cimarron River basins.
Slopes: 0 to 3 percent.
Mean annual air temperature: 55 to 61 degrees F
Mean annual precipitation: 16 to 21 inches.
Frost-free period: 190 to 220
Elevation: 2,300 to 3,100 feet.
Thornthwaite annual P-E index values: 30 to 34.
GEOGRAPHICALLY ASSOCIATED SOILS: These are the similar
Bippus,
Paloduro, and
Sprone soils and the
Guadalupe,
Manson,
Mobeetie,
Plemons,
Potter, and
Veal soils.
Guadalupe soils are on floodplains and do not have calcic horizons.
Manson soils are on rolling plains and have a mollic epipedon less than 20 inches thick.
Mobeetie soils are on higher landscape positions and have a coarse-loamy particle-size control section.
Plemons soils are on rolling plains and have an ochric epipedon.
Potter and Veal soils are on higher landscape positions and have carbonatic mineralogy.
DRAINAGE AND PERMEABILITY: Well drained. Moderate permeability. Surface runoff is negligible on 0 to 1 percent slopes and low on 1 to 3 percent slopes.
USE AND VEGETATION: This soil is primarily used for rangeland and wildlife but, where cultivated, the principle crops are grain sorghum, winter wheat, and forage crops. Climax vegetation is dominated by blue grama, with lesser amounts of buffalograss, tobosa, vine-mesquite, Arizona cottontop, silver bluestem, western wheatgrass, white tridens, ephedra, condalias, wolfberry, gayfeather, gauras, greenthread, ratany, and heath aster. This soil has been correlated to the Clay Loam (077EY051TX) range site in MLRA-77E.
DISTRIBUTION AND EXTENT: Southern High Plains Breaks of Texas and Oklahoma (MLRA-77E in LRR H). The series is of minor extent.
MLRA OFFICE RESPONSIBLE: Temple, Texas
SERIES ESTABLISHED: Nolan County, Texas; 1978.
REMARKS: Series revised MLRA-77 Soil Survey; Carson County, Texas; 1997. These soils were formerly included in the Bippus and Tipton series.
Diagnostic horizons and features recognized in this pedon are:
Mollic epipedon: 0 to 52 inches. (A, Bt1, Bt2, Bt3, Bt4 horizons).
Argillic horizon: 8 to 65 inches. (Bt1, Bt2, Bt3, Bt4, Btk horizons).
Calcic horizon: 52 to 65 inches. (Btk horizon).
Cambic horizon: 65 to 80 inches. (2Bw horizon)
ADDITIONAL DATA: None
TAXONOMIC VERSION: Keys to Soil Taxonomy, Ninth Edition, 2003.