LOCATION ROSCOE                  TX+OK

Established Series
Rev. JAG-ALS-RM
03/2016

ROSCOE SERIES

The Roscoe series consists of very deep, moderately well drained, very slowly permeable soils that formed in calcareous clayey Pleistocene alluvium, on nearly level swales on alluvial plain remnants in the Central Rolling Red Plains (MLRA 78B, 78C). Slopes are 0 to 1 percent. Mean annual temperature is about 16.1 degree C (61 degrees F) and mean annual precipitation is about 559 mm (22 in).

TAXONOMIC CLASS: Fine, smectitic, thermic Typic Haplusterts

TYPICAL PEDON: Roscoe clay--cropland. (Colors are for dry soil unless otherwise stated.)

Ap--0 to 18 cm (0 to 7 in); dark gray (10YR 4/1) clay, very dark gray (10YR 3/1) moist; moderate fine angular blocky structure; surface mulch of very hard fine granules; very hard, firm, sticky, plastic; few fine roots; slightly alkaline; abrupt smooth boundary. (0 to 25 cm [0 to 10 in] thick)

A--18 to 36 cm (7 to 14 in); dark gray (10YR 4/1) clay, very dark gray (10YR 3/1) moist; moderate fine angular blocky structure; very hard, firm, sticky, plastic; shiny pressure faces on peds; few fine roots; slightly alkaline; diffuse wavy boundary. (20 to 71 cm [8 to 28 in] thick)

Bss1--36 to 76 cm (14 to 30 in); gray (10YR 5/1) clay, dark gray (10YR 4/1) moist; moderate medium angular blocky structure; extremely hard, very firm, very sticky, plastic; contains wedge shaped peds have long axis tilted about 30 degrees from horizontal; few prominent slickensides in lower part; shiny pressure faces on peds; few very fine calcium carbonate concretions in lower part; noneffervescent in upper part, slightly effervescent in lower part; slightly alkaline in upper part, moderately alkaline in lower part; gradual wavy boundary. (25 to 64 cm [10 to 25 in] thick)

Bss2--76 to 114 cm ( 30 to 45 in); grayish brown (10YR 5/2) clay, dark grayish brown (10YR 4/2) moist; common medium to very fine redoximorphic concentrations of light brown (7.5YR 6/4); moderate medium blocky structure; extremely hard, very firm; wedge shaped peds have long axis tilted about 30 degrees from horizontal; common distinct slickensides; shiny pressure faces on peds; few very fine calcium carbonate concretions; strongly effervescent; moderately alkaline; gradual wavy boundary. (25 to 51 cm [10 to 20 in] thick)

Bk1--114 to 152 cm (45 to 60 in); light brown (7.5YR 6/4) clay, brown (7.5YR 4/4) moist; common vertically oriented streaks of grayish brown (10YR 5/2) depletion masses; weak coarse prismatic structure parting to moderate fine angular blocky; very hard, firm; about 10 percent by volume of concretions and masses of calcium carbonate; strongly effervescent; moderately alkaline; gradual smooth boundary. (25 to 64 cm [10 to 25 in] thick)

Bk2--152 to 191 cm (60 to 75 in); light brown (7.5YR 6/4) clay, brown (7.5YR 5/4) moist; weak coarse prismatic structure parting to moderate fine angular blocky; very hard, firm, few very fine concretions and masses of calcium carbonate decreasing with depth; strongly effervescent; moderately alkaline.

TYPE LOCATION: Nolan County, Texas; from the split of west bound Interstate 20 and west bound U. S. Highway 84 near Roscoe; 1.1 miles west on Interstate 20 frontage road to junction with Nolan County Road 104; 0.5 mile north on Nolan County Road 104; 200 ft west of road in a cultivated field. Latitude: 32 degrees, 26 minutes, 43 seconds N; Longitude: 100 degrees, 31 minutes, 15 seconds W; Roscoe NE, Texas USGS quad; NAD 83.
RANGE IN CHARACTERISTICS:
Soil Moisture: An ustic soil moisture regime. The soil moisture control section is dry in some or all parts for more than 90 days but less than 150 cumulative days in normal years. November through March are the driest months, and April through October are the wettest.

Mean annual soil temperature: 16 to 19 degrees C (61 to 67 degrees F)
Depth to secondary calcium carbonate: 71 to 185 cm (28 to 73 in)
Depth to redox concentrations: 46 to 135 cm (18 to 53 in)
Depth to redox depletions: 71 to 185 cm (28 to 73 in)
Vertic features: 20 to 71 cm (8 to 28 in); undisturbed areas of this cyclic soil have gilgai microrelief in which microknolls are 15 to 51 cm (6 to 20 in) higher than microdepressions. The distance between centers of the microknolls and the centers of the microdepressions range from about 1.2 to 3.7 m (4 to 12 ft). When dry, cracks 1.3 to 5 cm (0.5 to 2 in) wide extend from the surface to a depth of 102 cm (40 in) or more.
Thickness of the solum, is more than 203 cm (80 in)
Particle-size control section (weighted average)
Total clay content: 40 to 60 percent
Sand content: 10 to 20 percent
Coarse Fragments: 0 to 2 percent
Reaction: slightly alkaline or moderately alkaline

A Horizon:
Hue: 10YR or 2.5Y
Value: 3 to 5 dry, 2 to 4 moist; moist color values are 4, they comprise less than one-half of the matrix.
Chroma: 0 to 2 dry; More than one-half of the surface layer has chroma of 1 or less; Thickness of chroma of 1 or less ranges from 46 cm (18 in) on the microknolls to 112 cm (44 in) in the microdepressions.
Texture: clay
Total clay content: 40 to 55 percent
Coarse fragments: 0 to 2 percent; siliceous gravel mainly less than 5 cm (2 in) across long axis
Effervescence: noneffervescent to slightly effervescent
Reaction: neutral or slightly alkaline

Bss or Bkss Horizon(s):
Hue: 7.5YR to 10YR
Value: 3 to 5
Chroma: 0 to 4
Texture: clay
Total clay content: 40 to 60 percent
Pressure faces: 3 to 10 percent, prominent, throughout
Slickensides: 3 to 20 percent, prominent, throughout
Redox accumulations: 3 to 10 percent very fine to medium light brown (7.5YR 6/4)
Coarse fragments: 0 to 2 percent; siliceous gravel mainly less than 5 cm (2 in) across long axis
Calcium carbonate equivalent: 0 to 15 percent
Identifiable secondary carbonate: 0 to 10 percent, very fine to fine as masses and concretions, throughout
Effervescence: slightly effervescent to strongly effervescent
Reaction: slightly alkaline or moderately alkaline

Bk Horizon:
Hue: 7.5YR to 10YR
Value: 5 to 8
Chroma: 1 to 4
Texture: clay
Total clay content: 40 to 60 percent
Redox depletions: 3 to 10 percent, vertically oriented streaks of grayish brown (10YR 5/2) depletion masses
Coarse fragments: 0 to 2 percent; siliceous gravel mainly less than 5 cm (2 in) across long axis
Calcium carbonate equivalent: 1 to 15 percent
Identifiable secondary carbonate: 1 to 12 percent, very fine to medium as masses and concretions, throughout
Gypsum: 0 to 3 percent
Effervescence: slightly effervescent to strongly effervescent
Reaction: slightly alkaline or moderately alkaline

COMPETING SERIES: These are the Campwood, Hollister, Indiahoma, Irion, Leeray, Lockney, and Teagard series in the same family. Similarsoil is the Kingco series.
Campwood: has 20 to 40 percent calcium carbonate equivalent in the upper subsoil and formed in clayey alluvium from Cretaceous age materials
Hollister: is well drained and are domininated by 2 chroma in the surface layer
Indiahoma: are well drained
Irion: has indurated platy limestone between 152 to 203 cm (60 and 80 in) and formed in clayey from Cretaceous age materials
Kingco: has mixed clay mineralogy
Leeray: is saline in the lower part of the subsoil, and are dominated by 2 chroma in the surface layer
Lockney: occurs in areas above 762 m (2500 ft) with mean annual temperature less than 16.7 degrees C (62 degrees F).
Teagard: has shale at 51 to 102 cm (20 to 40 in) depths and have mean annual temperatures less than 16.7 degrees C (62 degrees F).

GEOGRAPHIC SETTING:
Parent material: calcareous clayey Pliestocene alluvium from Quaternary and Tertiary Age material
Landform and landscape: swale on alluvial plain remnants
Slope: 0 to 1 percent, dominantly less than 0.5 percent
Mean annual air temperature range: 14 to 18 degrees C (57 to 65 degrees F).
Mean annual precipitation range: 432 to 635 mm (17 to 25 in)
Precipitation Pattern: Precipitation falls mostly during the months of April through October. November through March are the driest months. Spring precipitation occurs during widely scattered intense thunderstorms.

Frost-free period: 185 to 240 days
Elevation: 457 to 869 m (1500 to 2850 ft)
Thornthwaite annual P-E indices: 25 to 36

GEOGRAPHICALLY ASSOCIATED SOILS: These are the Dermott, Hermleigh, Pyron, Sagerton, and Snyder series.
Dermott soils: occurs higher in the landscape on shoulders, summits and breaks into valleys and drains. It is shallow to a petrocalcic.
Hermleigh soils: occurs lower in the landscape in depressions and are frequently ponded for more than 7 to more than 30 days following heavy rains
Pyron soils: occurs on similar to higher positions and is a Mollisol
Sagerton soils: occurs on similar to higher positions and is a Mollisol
Snyder soils: occurs on a higher position and is in a fine-loamy family

DRAINAGE AND PERMEABILITY: Moderately well drained; very slow permeability; runoff is negligible. Ponding frequency is none to rare. These soils are ponded 0 to 5 times in 100 years.

USE AND VEGETATION: Mostly cultivated to cotton and grain sorghum. Rangeland areas support buffalograss, vine mesquite, white tridens, tobosa. Sedges are in the bottoms of microdepressions. Mesquite has invaded some areas. This soil has been correlated to the Clay Flat (R078BY071TX) ecological sites in MLRA-78B.

DISTRIBUTION AND EXTENT: Central Rolling Red Plains (MLRA 78B, 78C) of north central Texas and southwest Oklahoma. The soil is moderately extensive.

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

SERIES ESTABLISHED: Reconnaissance Soil Survey of West Central Texas; 1922.

REMARKS: The soil was formerly classed in the Grumusol great soil group.
Diagnostic horizons and features recognized with this pedon are:

Mollic epipedon: 0 to 36 cm (0 to 14 in) (A horizons)
Vertic features: slickensides in the zone from 36 to 114 cm (14 to 45 in) (Bss horizons). Cracks that open and close periodically.
Secondary carbonates: 114 to 190 cm (45 to 75 in) (Bk horizons)

ADDITIONAL DATA: None

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

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National Cooperative Soil Survey
U.S.A.