LOCATION SPURLOCK TX+NM

Established Series
Rev. JCW-RM
03/2016

SPURLOCK SERIES

The Spurlock series consists of deep, well drained, moderately permeable soils formed in calcareous loamy eolian sediments. These soils are on nearly level to sloping uplands. Slopes range from 0 to 9 percent. Mean annual precipitation is 406 mm (16 in) and the mean annual air temperature is 13 degrees C (55 degrees F).

TAXONOMIC CLASS: Coarse-loamy, carbonatic, mesic Calcidic Paleustalfs

TYPICAL PEDON: Spurlock loam - pasture. (Colors are for dry soil unless otherwise stated.)

A--0 to 18 cm (0 to 7 in); brown (10YR 5/3) loam, brown (10YR 4/3) moist; moderate fine and very fine subangular blocky structure; hard, friable; many fine pores; many wormcasts; few fine concretions of calcium carbonate; calcareous, moderately alkaline; clear smooth boundary. (13 to 30 cm [5 to 12 in] thick)

Bk--18 to 41 cm (7 to 16 in); pale brown (10YR 6/3) clay loam, brown (10YR 4/3) moist; moderate fine and very fine subangular blocky structure; hard, friable; many fine pores; films, common threads and fine concretions of calcium carbonate; about 30 percent calcium carbonate by volume; calcareous; moderately alkaline; clear smooth boundary. (15 to 36 cm [6 to 14 in] thick)

Bkk--41 to 81 cm (16 to 32 in); very pale brown (10YR 8/2) clay loam, light brownish gray (10YR 6/2) moist; weak fine and medium subangular blocky structure; hard, friable; few fine pores; films, threads, soft masses and weakly cemented concretions of calcium carbonate comprising an estimated 60 percent by volume; calcareous; moderately alkaline; diffuse smooth boundary. (20 to 58 cm [8 to 23 in] thick)

2Btk1--81 to 152 cm (32 to 60 in); pink (7.5YR 7/4) clay loam, strong brown (7.5YR 5/6) moist; weak fine and medium subangular blocky structure; hard, friable; few fine pores; many films, threads, and weakly cemented concretions of calcium carbonate comprising an estimated 30 percent by volume; calcareous; moderately alkaline; clear smooth boundary. (28 to 97 cm [11 to 38 in] thick)

2Btk2--152 to 213 cm (60 to 84 in); reddish yellow (5YR 6/6) clay loam, yellowish red (5YR 5/6) moist; weak medium subangular blocky structure; hard, friable; few fine pores; patchy clay films on ped surfaces; few films and soft masses of calcium carbonate; calcareous; moderately alkaline.

TYPE LOCATION: Sherman County, Texas; from the intersection of U.S. 287 and U.S. 54 in Stratford; south approximately 4.6 miles on U.S. 287; east approximately 5 miles on County road Q; south approximately 3 miles on F.M. 2232; east approximately 2.5 miles on County road T; 161 ft north in rangeland; Latitude: 36 degrees, 13 minutes, 39 seconds N; Longitude: 101 degrees, 54 minutes, 34 seconds W; Spurlock Chapel, Texas USGS quad; NAD 83.

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 220 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: 12 to 15 degrees C (54 to 59 degrees F)
Depth to secondary carbonates: 10 to 18 cm (4 to 7 in)
Depth to calcic horizon: 13 to 30 cm (5 to 12 in)
Solum thickness: more than 203 cm (80 in)
Particle-size control section: 18 to 35 percent silicate clay.
Surface coarse fragments: 0 to 10 percent.
Coarse fragments: 0 to 15 percent.

A horizon:
Hue: 7.5YR or 10YR
Value: 5 to 6, 3 to 4 moist
Chroma: 2 to 3
Texture: loamy sand, fine sandy loam, loam or clay loam
Coarse fragments: 0 to 6 percent by volume of very strongly cemented calcium carbonate nodules
Effervescence: slight
Reaction: neutral to moderately alkaline

Bk horizons:
Hue: 7.5YR or 10YR
Value: 5 to 7, 4 to 6 moist
Chroma: 2 to 4
Texture: sandy clay loam, loam or clay loam
Coarse fragments: 0 to 7 percent by volume of very strongly cemented calcium carbonate nodules
Calcium carbonates equivalent: 15 to 40 percent by volume in the form of threads, nodules and concretions.
Effervescence: violent
Reaction: moderately alkaline

Bkk horizons:
Hue: 7.5YR or 10YR
Value: 6 to 8, 5 to 7 moist
Chroma: 2 to 4
Texture: sandy clay loam, loam or clay loam
Coarse fragments: 2 to 15 percent by volume of very strongly cemented calcium carbonate nodules
Calcium carbonates equivalent: 50 to 70 percent by volume in the form of films, threads, masses, nodules and concretions.
Effervescence: violent
Reaction: moderately alkaline

2Btk horizons:
Hue: 5YR or 7.5YR
Value: 6 to 7, 5 to 6 moist
Chroma: 4 to 6
Texture: sandy clay loam, clay loam
Coarse fragments: 2 to 13 percent by volume of very strongly cemented calcium carbonate nodules
Calcium carbonate equivalent: 10 to 35 percent by volume in the form of films, threads, masses, nodules and concretions.
Effervescence: strong or violent
Reaction: moderately alkaline

COMPETING SERIES: There are no other series in this family. Similar soils include the Conlen, Flomot, Tulia, and Veal series.
Conlen soils: have darker colors in the surface horizon.
Flomot, Tulia and Veal soils: have mean annual soil temperatures above 15 degrees C (59 degrees F). In addition, Veal soils do not have an argillic horizon.

GEOGRAPHIC SETTING:
Parent material: loamy eolian deposits from the Blackwater Draw Formation of Pleistocene age.
Landform: gently sloping uplands, generally along drainageways or valleys.
Slopes: 0 to 9 percent.
Mean annual air temperature: 11 to 14 degrees C (52 to 57 degrees F)
Mean annual precipitation: 381 to 432 mm (15 to 17 in)
Frost-free period: 165 to 185 days.
Elevation: 1,128 to 1,707 m (3,700 to 5,600 ft)

GEOGRAPHICALLY ASSOCIATED SOILS: These are the similar Pastura and Sunray series.
Pastura soils: are on similar and lower landscape positions and have a petrocalcic horizons within 51 cm (20 in) of the surface.
Sunray soils: are on similar landscape positions and have darker colors in the surface horizon and have mixed mineralogy.

DRAINAGE AND PERMEABILITY: Well drained and moderately permeable. Surface runoff is negligible on 0 to 1 percent slopes, low on 1 to 5 percent slopes and medium on 5 to 9 percent slopes.

USE AND VEGETATION: Mainly used for rangeland and wildlife habitat but also used as cropland. Principal crops grown are wheat, grain sorghum and forage sorghum. Climax vegetation in rangeland is mainly mid grasses and short grasses and includes blue grama, sideoats grama and buffalograss with lesser amounts of western wheatgrass, galleta, silver bluestem and prairieclover. This soil has been correlated to the High Lime (R077BY722TX) ecological site in MLRA-77B.

DISTRIBUTION AND EXTENT: Southern High Plains north of Canadian River in Texas, northeastern New Mexico and the western panhandle of Oklahoma. The series is of moderate extent.

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

SERIES ESTABLISHED: Sherman County, Texas; 1970.

REMARKS: The former classification was in the Calcisol great soils group.

Diagnostic horizons and features recognized in this pedon are:

Ochric epipedon: 0 to 18 cm (0 to 7 in) (A horizon)
Calcic horizon: 18 to 213 cm (7 to 84 in) (Bk, Bkk, and 2Btk horizons)
Argillic horizon: 81 to 213 cm (32 to 84 in) (2Btk horizons)
Lithologic discontinuity: 81 to 213 cm (32 to 84 in) (2Btk horizons)

ADDITIONAL DATA: None

Taxonomic Version: Keys to Soil Taxonomy, Twelfth Edition, 2014.

National Cooperative Soil Survey
U.S.A.