LOCATION SPURLOCK TX+NM OK

Established Series
Rev. JCW-SLM-BAV
09/2023

SPURLOCK SERIES

The Spurlock series consists of very deep, well drained, moderately permeable soils formed in loamy, calcareous eolian sediments of Pleistocene age. These soils occur on nearly level to gently sloping plains, interfluves, and playa rims in the Southern High Plains, Northern Part (MLRA 77A). The slope range is 0 to 9 percent. Mean annual precipitation is about 406 mm (16 in) and the mean annual air temperature is about 13 degrees C (55 degrees F).

TAXONOMIC CLASS: Coarse-loamy, carbonatic, mesic Aridic Calciustepts

TYPICAL PEDON: Spurlock loam, on a 2 percent linear slope in rangeland at an elevation of about 1067 meters (3,500 ft). (Colors are for dry soil unless otherwise stated.)

Ak--0 to 18 cm (0 to 7 in); brown (10YR 5/3) loam, brown (10YR 4/3) moist; moderate very fine subangular blocky structure; hard, friable; many fine pores; many wormcasts; few fine nodules of calcium carbonate; calcareous, moderately alkaline; clear smooth boundary. Combined thickness of the A or Ak horizons is 5 to 35 cm (2 to 14 in)

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 irregular nodules of calcium carbonate; about 30 percent calcium carbonate by volume; calcareous; moderately alkaline; clear smooth boundary. Combined thickness of the Bk horizons is 13 to 48 cm (5 to 19 in)

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. Combined thickness of the Bkk horizons is 20 to 58 cm (8 to 23 in)

BCk--81 to 152 cm (32 to 60 in); pink (7.5YR 7/4), strong brown (7.5YR 5/6), moist; clay loam; weak coarse subangular blocky structure; hard, friable; few fine pores; 35 percent carbonate coats; 13 percent threadlike carbonate masses and 10 percent carbonate masses; fragments; violent effervescence; moderately alkaline, pH 8.0; clear smooth boundary. (28 to 97 cm [11 to 38 in] thick)

Ck--152 to 213 cm (60 to 84 in); light brown (7.5YR 6/4), brown (7.5YR 5/4), moist; clay loam; structureless massive; hard, friable; few fine pores; 15 percent carbonate coats; 1 percent threadlike carbonate masses and 1 percent fine weakly coherent cemented carbonate masses; fragments; violent effervescence; moderately alkaline, pH 8.0.

TYPE LOCATION: Sherman County, Texas; from the intersection of U.S. Hwy 287 and U.S. Hwy 54 in Stratford; approximately 4.6 miles south on U.S. 287; then approximately 5 miles east on County Road Q; then approximately 3 miles south on F.M. 2232; approximately 2.5 miles east on County road T; 161 ft (49 m) north into rangeland.

USGS topographic quadrangle: Spurlock Chapel, Texas
Latitude: 36 degrees 13 minutes 39.6 seconds N
Longitude: 101 degrees 54 minutes 32.24 seconds W
Datum WGS84

Decimal Degrees
Latitude: 36.2276649
Longitude: -101.9089584

UTM Easting: 238544 m
UTM Northing: 4013125 m
UTM Zone: 14S

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.
Solum thickness: more than 203 cm (more than 80 in)
Thickness of ochric epipedon: 15 to 35 cm (6 to 14 in)
Depth to secondary calcium carbonate: 0 to 35 cm (0 to 14 in)
Depth to calcic horizon: 5 to 55 cm (2 to 22 in)

Particle-size control section (weighted average):
Section range: 25 to 100 cm (10 to 40 in)
Total clay: 18 to 45 percent
Silicate clay: 3 to 18 percent
Clay-sized carbonate: 6 to 30 percent
Total sand: 20 to 70 percent
Rock fragments: 0 to 14 percent; fine to coarse nodules, strongly coherent to indurated nodules and concretions of calcium carbonate
Surface fragments: 0 to 10 percent; fine to coarse nodules, strongly coherent to indurated nodules and concretions of calcium carbonate
Calcium carbonate equivalent: 40 to 70 percent
A or Ak horizon:
Hue: 7.5YR or 10YR
Value: 5 to 6, 3 to 5 moist
Chroma: 2 to 4
Texture: loamy fine sand, sandy loam, fine sandy loam, loam, or clay loam
Identifiable calcium carbonate: 0 to 5 percent; fine or medium; masses, nodules, and finely disseminated carbonate
Calcium carbonate equivalent: 5 to 35 percent
Coarse fragments: 0 to 3 percent; fine to coarse gravel; strongly cemented to indurated carbonate nodules and concretions
Effervescence: strong or violent
Reaction (pH): moderately alkaline or strongly alkaline (7.9 to 8.4)

Bk horizons:
Hue: 7.5YR or 10YR
Value: 4 to 7, 4 to 6 moist
Chroma: 2 to 4 moist or dry
Texture: fine sandy loam, sandy clay loam, or clay loam
Identifiable secondary carbonates: 0 to 10 percent; fine to coarse; masses, nodules, and finely disseminated carbonate
Calcium carbonate equivalent: 1 to 12 percent
Coarse fragments: 0 to 10 percent; fine to coarse gravels; strongly cemented to indurated carbonate nodules and concretions
Effervescence: strong or violent
Reaction (pH): moderately alkaline or strongly alkaline (7.9 to 8.4)

Bkk horizons:
Hue: 7.5YR or 10YR
Value 5 to 8, 4 to 7 moist
Chroma: 2 to 4 moist or dry
Texture: fine sandy loam, sandy clay loam, clay loam, or clay, and their gravelly counterparts
Identifiable secondary carbonates: 50 to 80 percent; fine to very coarse; masses, nodules, concretions, films, and finely disseminated carbonate
Calcium carbonate equivalent: 40 to 80 percent
Coarse fragments: 0 to 30 percent; fine to coarse gravels; strongly cemented to indurated carbonate nodules and concretions
Effervescence: violent
Reaction (pH): strongly alkaline or very strongly alkaline (8.5-9.2)

BCk and Ck horizons:
Hue: 7.5YR or 10YR
Value 5 to 7, 4 to 6 moist
Chroma: 2 to 4 moist or dry
Texture: sandy loam, fine sandy loam, loam, sandy clay loam, clay loam and their gravelly and very gravelly counterparts
Identifiable secondary carbonates: 15 to 49 percent; fine to very coarse; masses, nodules, concretions, films, and finely disseminated carbonate
Calcium carbonate equivalent: 20 to 40 percent
Coarse fragments: 2 to 40 percent; fine to coarse gravels; 0 to 5 percent cobbles as strongly cemented to indurated carbonate nodules and concretions, or petrocalcic fragments
Effervescence: violent
Reaction (pH): strongly alkaline or very strongly alkaline (8.5-9.2)

Btkb, and 2Btk horizons (where present):
Hue: 2.5YR to 10YR
Value 5 or 8, 4 or 7 moist
Chroma: 3 to 8
Texture: loam, sandy clay loam, or clay loam
Other features: some pedons have an argillic horizon engulfed with carbonates below 150 cm (below 59 in)
Identifiable secondary carbonates: 30 to 50 percent; fine to very coarse; masses, nodules, concretions, films, and finely disseminated carbonates
Calcium carbonate equivalent: 10 to 35 percent
Coarse fragments: 2 to 10 percent; fine to coarse gravels; strongly cemented to indurated carbonate nodules and concretions
Effervescence: violent
Reaction (pH): moderately alkaline or strongly alkaline (7.9-9.0)

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 (mollic epipedon).
Flomot, Tulia, and Veal soils: have mean annual soil temperatures above 15 degrees C (59 degrees F).

GEOGRAPHIC SETTING:
Parent material: Loamy, calcareous eolian sediments of Pleistocene age
Landscape: High Plains
Landform: plains, interfluves, playa rims
Slope: dominantly 0 to 3 percent, but ranging from 0 to 9 percent
Mean annual precipitation: 381 to 584 mm (15 to 23 in)
Thornthwaite annual P-E Index Values: 25 to 36
Mean annual air temperature: 11.7 to 13.9 degrees C (53 to 57 degrees F)
Frost-free period: 170 to 200 days
Elevation: 750 to 1707 m (2460 to 5600 ft)

GEOGRAPHICALLY ASSOCIATED SOILS: These are the Capps, Conlen, Dalhart, Dumas, Gruver, Kerrick, Plack, Sherm, Sunray, Texline, and Rickmore soils.
Capps soils: occur on similar positions, have a mollic epipedon, are noncalcareous to the surface, and have 18 to 35 percent silicate clay in the particle-size control section
Conlen soils: occur on similar positions, and have a mollic epipedon
Dalhart and Rickmore soils: occur on higher positions, have an argillic horizon, and have between 18 to 35 percent silicate clay in the particle-size control section
Dumas and Texline soils: occur on higher positions, have a mollic epipedon, an argillic horizon, and have between 18 and 35 percent silicate clay in the particle-size control section
Gruver and Sherm soils: occur on higher positions, have an argillic horizon, and have greater than 35 percent silicate clay in the particle-size control section
Kerrick soils: occur on similar positions, have a mollic epipedon, and have a petrocalcic horizon within 50 to 100 cm (20 to 40 in) of the soil surface
Plack soils: occur on similar positions, have a mollic epipedon, and have a petrocalcic horizon within 50 cm (20 in) of the soil surface
Sunray soils: occur on similar positions, have a mollic epipedon, an argillic horizon, have between 18 and 35 percent silicate clay in the particle-size control section

DRAINAGE AND PERMEABILITY:
Drainage: well drained
Permeability: moderate
Runoff: 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:
Major use: livestock grazing, wildlife management, and cropland
Native vegetation: 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.
Crops: wheat, grain sorghum and forage sorghum
Ecological sites assigned to phases and components of this series are listed below. Current ecological site assignments are in Web Soil Survey. Components of this series include the following ecological sites: Limy Upland 16-22" PZ (R077AY006TX)

DISTRIBUTION AND EXTENT:
General area: Western portions of the Oklahoma and Texas panhandles, and Northeastern New Mexico
Land Resource Region: H - Central Great Plains Winter Wheat and Range Region Sunray
MLRA 77A - Southern High Plains, Northern Part; MLRA 77B - Southern High Plains, Northwestern Part
Extent: extensive

SOIL SURVEY REGIONAL OFFICE (SSRO) RESPONSIBLE: Temple, Texas

SERIES ESTABLISHED: Sherman County, Texas; 1970.

REMARKS:

9/2023 - Updated the taxonomic classification to reflect original soil series concept and supporting data from Sherman Co., TX.

Diagnostic horizons and features recognized in this pedon:
Ochric epipedon: 0 to 18 cm (0 to 7 in) (A horizon)
Secondary carbonates: 0 to 213 cm (0 to 84 in) (all horizons)
Calcic horizon: 18 to 213 cm (7 to 84 in) (Bk, Bkk, and 2Btk horizons)

Pedon ID: P1975TX421015 (Sherman County, TX)

ADDITIONAL DATA: None available

Taxonomic Version: Keys to Soil Taxonomy, Thirteenth Edition, 2022.

National Cooperative Soil Survey
U.S.A.