LOCATION WEYMOUTH                TX+OK

Established Series
Rev. ERB:JCW
11/2015

WEYMOUTH SERIES

The Weymouth series consists of moderately deep, well drained, moderately permeable soils formed in calcareous, loamy and clayey alluvium and/or colluvium over dense, noncemented mudstone bedrock of Permian or Triassic age. These gently to strongly sloping soils occur on side slopes of hillslopes on dissected plains. Slope range from 1 to 15 percent. Mean annual precipitation is about 584 mm (23 in), and mean annual air temperature is about 16.7 degrees C (62 degrees F).

TAXONOMIC CLASS: Fine-loamy, mixed, superactive, thermic Typic Calciustepts

TYPICAL PEDON: Weymouth clay loam - rangeland.
(Colors are for dry soil unless otherwise stated.)

A--0 to 15 cm (0 to 6 in); reddish brown (5YR 5/4) clay loam, reddish brown (5YR 4/4) moist; weak fine granular and subangular blocky structure; hard, friable; common fine roots; many very fine and fine pores; calcareous; moderately alkaline; clear smooth boundary. Thickness is 10 to 25 cm (4 to 10 in)

Bw--15 to 46 cm (6 to 18 in); reddish brown (5YR 5/4) clay loam, dark reddish brown (5YR 3/4) moist; moderate fine and medium subangular blocky structure; hard, firm; common fine roots; many very fine and fine pores; common medium worm casts; few fine calcium carbonate concretions and a few films and threads of calcium carbonate; calcareous; moderately alkaline; gradual smooth boundary. Thickness is 15 to 38 cm (6 to 15 in)

Bk--46 to 76 cm (18 to 30 in); reddish brown (2.5YR 5/4) clay loam, reddish brown (2.5YR 4/4) moist; moderate fine and medium subangular blocky structure; hard, firm; few fine roots; few fine pores; about 15 percent by volume of fine to medium bodies and concretions of calcium carbonate; calcareous; moderately alkaline; gradual smooth boundary. Thickness is 25 to 64 cm (10 to 25 in)

Cd--76 to 152 cm (30 to 60 in); reddish brown (2.5YR 4/4) partially weathered, massive, calcareous clayey shale; moderately alkaline.

TYPE LOCATION: Childress County, Texas; 2.2 miles east of the village of Kirkland on U.S. Highway 287, 2.6 miles south on county road, 0.1 mile east on county road, 50 feet north of road, in rangeland.
U.S. topographic quadrangle: Kirkland South, Texas;
Latitude: 34 degrees, 20 minutes, 0.08 seconds N;
Longitude: 100 degrees, 1 minute, 16.83 seconds W;
Datum: WGS84.
UTM Easting 406050 m, UTM Northing 3799591 m, UTM Zone 14.

RANGE IN CHARACTERISTICS:
Thickness of the ochric epipedon: 10 to 25 cm (4 to 10 in)
Depth to densic bedrock: 51 to 102 cm (20 to 40 in)
Depth to secondary calcium carbonate: 10 to 25 cm (4 to 10 in)
Depth to calcic horizon: 30 to 61 cm (12 to 24 in)
Effervescence: Calcareous in all parts above the calcic horizon after the soil between the mineral soil surface and a depth of 18 cm (7 in) has been mixed

Particle-size control section (weighted average):
Clay content: 20 to 35 percent

A horizon
Hue: 5YR to 10YR
Value: 4 or 5
Chroma: 2 to 4
Texture: clay loam or loam
Rock fragments: 0 to 5 percent; gravel of quartzite or carbonate
Calcium carbonate equivalent: 1 to 5 percent
Reaction (pH): moderately alkaline (7.9 to 8.4)

Bk1 or Bw horizon
Hue: 2.5YR to 7.5YR
Value: 4 or 5
Chroma: 4 to 6
Texture: clay loam, sandy clay loam, loam
Rock fragments: 0 to 15 percent; gravel of quartzite or carbonate
Identifiable secondary carbonate: 0 to 5 percent, fine, coats, threads, concretions, or masses
Calcium carbonate equivalent: 5 to 15 percent
Reaction (pH): moderately alkaline (7.9 to 8.4)

Bk horizon
Hue: 2.5YR or 5YR
Value: 4 to 6
Chroma: 4 to 6
Texture: clay loam, sandy clay loam, loam, silty clay loam
Rock fragments: 0 to 15 percent; gravel of quartzite or carbonate
Identifiable secondary carbonate: 5 to 35 percent, fine or medium, coats, concretions, or masses
Calcium carbonate equivalent: 15 to 40 percent
Reaction (pH): moderately alkaline (7.9 to 8.4)

Cd horizon
Hue: 2.5YR or 5YR
Value: 4 to 7
Chroma: 3 to 8
Texture: partially weathered silty, sandy, or clayey redbeds
Structure: massive with rock structure
Cementation class: noncemented, material slakes in minutes
Bulk density: 1.60 to 2.38 g/cm3
Fracture interval: 10 to 200 cm (4 to 80 in)
Excavation difficulty: low to high
Calcium carbonate equivalent: 0 to 15 percent
Reaction (pH): moderately alkaline (7.9 to 8.4)

COMPETING SERIES: This is the Case series in the same family. Similar soils are the Aspermont, Obaro, Shep, Vernon, and Woodward series.
Case soils: have greater than 40 percent calcium carbonate equivalent in the calcic horizon
Aspermont and Obaro soils: have less than 15 percent coarser than very fine sand in the particle-size control section
Shep soils: are very deep to bedrock
Vernon soils: have greater than 35 percent clay in the particle-size control section
Woodward soils: have less than 18 percent clay in the particle-size control section and do not have a calcic horizon

GEOGRAPHIC SETTING:
Parent material: calcareous, loamy and clayey alluvium and/or colluvium over residuum derived from siltstone/claystone of Permian or Triassic age
Landscape: dissected plains
Landform: summits to footslopes of interfluves or side slopes on hillslopes and ridges
Slope: 1 to 15 percent
Mean annual precipitation: 508 to 660 mm (20 to 26 in)
Thornthwaite P-E indices: 28 to 40
Mean annual air temperature: 13.9 to 18.3 degrees C (57 to 65 degrees F)
Frost Free Days: 180 to 240
Elevation: 457.2 to 762.0 m (1500 to 2500 ft)

GEOGRAPHICALLY ASSOCIATED SOILS: These are the Aspermont, Hollister, Knoco, Obaro, Stamford, Tillman, Vernon, Westill, Wichita, and Woodward series.
Aspermont and Obaro soils: occur on similar positions
Hollister soils: slightly lower on the landscape and are very deep to bedrock
Knoco soils: occur on slightly higher positions and are less than 51 cm (20 in) to bedrock
Stamford soils: occur on similar and slightly lower positions and have intersecting slickensides
Tillman, Westill, and Wichita soils: occur on slightly lower positions and have greater the 35 percent clay in the particle-size control section
Vernon soils: occur on similar positions
Woodward soils: occur on similar positions

DRAINAGE AND PERMEABILITY: Well drained. Permeability is moderate. Runoff is high on slopes of 1 to 5 percent and very high on slopes over 5 percent.

USE AND VEGETATION: Cropland and native rangeland. Some gently sloping areas are mainly farmed. Small grain and sorghum are the principal crops. Rangeland vegetation is mostly sideoats and bluegrama and in the drier areas buffalograss and hairy grama. Widely spaced mesquite trees or shrubs occur on most areas.

DISTRIBUTION AND EXTENT: Land Resource Region H-Central Great Plains Winter Wheat and Range Region; MLRAs - 78B and 78C (Central Rolling Red Plains). This series is of large extent.

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

SERIES ESTABLISHED: Potter County, Texas; 1929.

REMARKS:
Edited 11/2015 (RFG-CJV): Series classification changed from Typic Haplustepts in order to recognize a calcic horizon. Almost all descriptions in published Soil Survey manuscripts are described like calcic horizons. Changed to tabular format. Added metric measurements. Updated horizon range in characteristics, competing series lists, geographically associated soil, and geographic setting.

Diagnostic horizons and features recognized in this pedon are:
Particle-size control section: 25 to 76 cm (10 to 30 in). (Parts of Bw horizon and Bk horizon)
Ochric epipedon: 0 to 15 cm (0 to 6 in). (A horizon)
Cambic horizon: 15 to 46 cm (6 to 18 in). (Bw horizon)
Identifiable secondary carbonates: 15 to 76 cm (6 to 30 in). (Bw and Bk horizons)
Calcic horizon: 46 to 76 cm (18 to 30 in). (Bk horizon)
Densic contact: The contact with claystone or shale at 76 cm (30 in). (Cd horizon)

Underlying material - Most clods slake in water in less than 1 hour. This material can be dug with a light duty backhoe.

ADDITIONAL DATA: KSSL data 82TX207001 (Haskell Co., TX)

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

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National Cooperative Soil Survey
U.S.A.