LOCATION TRUCE TX

Established Series
Rev. ACT:WJG
11/2013

TRUCE SERIES

The Truce series consists of soils that are deep over claystone bedrock. These well drained, slowly permeable soils formed in loamy colluvium and/or slope alluvium over clayey residuum derived from claystone of Pennsylvanian age. These soils are on gently sloping to steep, convex ridges. Slopes are typically 1 to 5 percent, but range from 1 to 40 percent. Mean annual precipitation is about 813 mm (32 in) and the mean annual air temperature is about 18.3 degrees C (65 degrees F).

TAXONOMIC CLASS: Fine, mixed, active, thermic Udic Paleustalfs

TYPICAL PEDON: Truce fine sandy loam, stony on a 2 percent convex slope in rangeland. (Colors are for dry soil unless otherwise stated.)

A--0 to 8 cm (0 to 3 in); brown (10YR 4/3) fine sandy loam, dark brown (10YR 3/3) moist; weak fine subangular blocky structure when moist; hard and massive when dry; hard, friable; common fine roots; slightly acid; abrupt smooth boundary. Thickness is 5 to 25 cm (2 to 10 in)

E--8 to 20 cm (3 to 8 in); pale brown (10YR 6/3) fine sandy loam, brown (10YR 5/3) moist; weak fine subangular blocky structure; hard, friable; common fine roots; slightly acid; abrupt smooth boundary. Thickness is 0 to 18 cm (0 to 7 in) with combined thickness of A and E horizon being 5 to 30 cm (2 to 12 in)

Bt1--20 to 56 cm ( 8 to 22 in); reddish brown (5YR 4/4) clay, dark reddish brown (5YR 3/4) moist; moderate fine and medium blocky structure; extremely hard, very firm; few fine roots; common clay films on surfaces of peds; slightly alkaline; gradual wavy boundary. Thickness is 20 to 46 cm (8 to 18 in)

Bt2--56 to 76 cm (22 to 30 in); brown (7.5YR 5/4) clay, brown (7.5YR 4/4) moist, few fine distinct yellowish red and yellowish brown mottles; moderate fine and medium blocky structure; extremely hard, very firm; few fine roots; common clay films on surfaces of peds; slightly alkaline; gradual wavy boundary. Thickness is 10 to 51 cm (4 to 20 in)

BCt--76 to 140 cm (30 to 55 in); light yellowish brown (10YR 6/4) clay, yellowish brown (10YR 5/4) moist; weak medium blocky structure; extremely hard, very firm; few fine roots; few clay films; strongly effervescent; moderately alkaline; clear wavy boundary. Thickness is 10 to 76 cm (4 to 30 in)

Cd--140 to 203 cm (55 to 80 in); pale olive (5Y 6/3) claystone bedrock, olive (5Y 5/3) moist; weak fine and medium platy structure; few fine roots between plates; few films and threads of calcium carbonate in cracks and fractures; moderately alkaline.

TYPE LOCATION: Erath County, Texas; from the junction of Interstate 20 and Texas Highway 108, 0.95 mile south on Texas Highway 108, then 75 feet east of highway right-of-way in native range, this point being about 22 miles north-northwest of Stephenville, Texas. USGS topographic quadrangle: Gordon, TX; Latitude: 32 degrees, 30 minutes, 4.24 seconds, N; Longitude: 98 degrees, 21 minutes, 56.34 seconds, W. WGS84; UTM Easting 559589.97 m, UTM Northing 3596166.84; UTM Zone 14.

RANGE IN CHARACTERISTICS:
Soil Moisture: Udic-ustic soil moisture regime
Depth to densic bedrock: 102 to 152 cm (40 to 60 in)
Surface Fragments: 0 to 20 percent; cobbles and stones of ironstone and sandstone.

Particle-size control section (weighted average)
Clay content: 35 to 55 percent

A horizon:
Hue: 7.5YR, 10YR
Value: 4 to 6
Chroma: 2 to 4
Texture: fine sandy loam
Clay content: 8 to 20 percent
Structure: hard and massive when dry
Rock fragments: 0 to 25 percent; gravel, cobbles, and stones of ironstone and sandstone
Reaction: moderately acid to neutral

E horizon:
Hue: 7.5YR, 10YR
Value: 5 to 8
Chroma: 2 to 4
Texture: fine sandy loam
Clay content: 8 to 20 percent
Rock fragments: 0 to 25 percent; gravel, cobbles, and stones of ironstone and sandstone
Reaction: moderately acid to neutral

Upper Bt horizon:
Hue: 2.5YR, 5YR
Value: 3 to 5
Chroma: 3 to 8
Texture: clay, sandy clay, clay loam
Clay content:35 to 55 percent
Rock Fragments: 0 to 10 percent by volume; ironstone and sandstone gravel.
Reaction: slightly acid to slightly alkaline

Lower Bt horizon:
Hue: 5YR, 7.5YR, 10YR
Value: 4 to 6
Chroma: 3 to 6
Texture: clay, sandy clay, clay loam
Clay content: 35 to 55 percent
Redox features: Some pedons have features in shades of red, brown, or olive
Rock Fragments: 0 to 10 percent by volume; ironstone and sandstone gravel.
Reaction: neutral to moderately alkaline

BCt or BCk horizon: (where present)
Color: shades of brown or olive
Redox features: Some pedons have features in shades of red, brown, or olive
Effervescence: calcareous in most pedons
Reaction: neutral to moderately alkaline

Cd horizon:
Color: shades of olive, brown, yellow, and gray
Texture: non-cemented claystone bedrock or dense clay; some pedons have thin discontinuous interbedded layers of sandstone
Effervescence: calcareous in most pedons
Reaction: neutral to moderately alkaline.

COMPETING SERIES: These include the Callisburg (TX), Chigley (OK), Cona (TX), Edge (TX), Minwells (TX), Shiro (TX), and Windthorst (TX) series in the same family.
Callisburg soils: are greater than 152 cm (60 in) to bedrock or densic material
Chigley soils: have hard conglomerate bedrock within 203 cm (80 in)
Cona and Shiro soils: are less than 102 cm (40 in) to bedrock
Edge soils: are underlain by siltstone and occur in a more moist climate
Minwells soils: are underlain by thick beds of gravelly materials.
Windthorst soils: are moist in the soil moisture control section for longer periods and are more acid throughout.

GEOGRAPHIC SETTING:
Parent material: loamy colluvium and/or slope alluvium over clayey residuum derived from claystone interbedded with thin discontinuous layers of sandstone of Pennsylvanian age
Landscape: hills
Landform: mainly on convex surfaces of side slopes and base slopes of ridges
Slope: dominantly 1 to 5 percent, but ranges up to 40 percent
Mean annual precipitation: 686 to 889 mm (27 to 35 in)
Thornthwaite annul P-E index: 40 to 50
Mean annual air temperature: 17.2 to 18.9 degrees C (63 to 66 degrees F)
Frost-free period: 210 to 240 days
Elevation: 228.6 to 519.7 m (750 to 1705 ft)

GEOGRAPHICALLY ASSOCIATED SOILS: These are the Bonti, Exray, Owens, Shatruce, and Thurber series.
Bonti soils: are 51 to 102 cm (20 to 40 in) deep to sandstone bedrock and occurs mainly on higher ridgetops with plane slopes
Exray soils: are less than 51 cm (20 in) deep to sandstone bedrock, and occurs mainly on higher ridgetops
Owens soils: are more alkaline, do not have argillic horizons, and occur on similar positions
Shatruce soils: are 51 to102 cm (20 to 40 in) deep to non-cemented claystone bedrock and occur on higher bouldery escarpments
Thurber soils: have clay loam surface layers, secondary carbonates within 76 cm (30 in) of the surface, and occur on lower nearly level or gently sloping positions

DRAINAGE AND PERMEABILITY: Well drained. Permeability is slow. Runoff is medium on 1 to 5 percent slopes, high on 5 to 20 percent slopes, and very high on slopes greater than 20 percent.

USE AND VEGETATION: Mostly used as rangeland. A few small areas are cropped to small grains and sorghums. Climax vegetation is an open post oak savannah with tall and mid grasses such as indiangrass, big and little bluestem, and sideoats grama. Most areas contain other woody plants such as blackjack oak and elm with invading mesquite, cedar, and lotebush. Present herbaceous vegetation consists mainly of sideoats grama, Texas needlegrass, hairy grama, threeawns, sand dropseed, and other low producing perennials and annuals with western ragweed, Engelmann-daisy, bundleflower, prairie clover, primrose, and gayfeather.

DISTRIBUTION AND EXTENT: Texas North Central Prairies (MLRA 80B) and West Cross Timbers of Texas. The series is extensive.

MLRA SOIL SURVEY REGIONAL OFFICE (MO) RESPONSIBLE: Temple, Texas

SERIES ESTABLISHED: Erath County, Texas; 1965.

REMARKS:

Changed to tabular format and included metric values (RFG-11/2013)

Diagnostic horizons and features are as follows:
Particle size control section - 20 to 70 cm (8 to 28 in) (Bt1 and Bt2 horizons)
Ochric epipedon - 0 to 20 cm (0 to 8 in). (A and E horizons)
Argillic horizon - 20 to 76 cm (8 to 30 in). (Bt1 and Bt2 horizons)
Pale feature - abrupt textural change at a depth of 20 cm (8 in)
Densic material - 140 to 203 cm (55 to 80 in). (Cd layer)

ADDITIONAL DATA: NSSL sample nos. 76P0508 - 76P0513.

Taxanomic version: Keys to Soil Taxonomy, Eleventh Edition, 2010

National Cooperative Soil Survey
U.S.A.