LOCATION FORTYONE                OK+KS TX

Established Series
RFG-JGF-TLC
12/2018

FORTYONE SERIES

The Fortyone series consists of very deep, well drained, moderately rapidly permeable soils that formed in loamy and sandy alluvium of Pleistocene age. These very gently sloping to moderately steep soils occur on hillslopes, stream terraces, and terrace remnants on dissected plains. Slope ranges from 1 to 15 percent. Mean annual precipitation is about 610 mm (24 in) and mean annual temperature is about 15.0 degrees C (59 degrees F).

TAXONOMIC CLASS: Coarse-loamy, mixed, superactive, thermic Typic Haplustalfs

TYPICAL PEDON: Fortyone fine sandy loam, on a 6 percent slope in rangeland; elevation is 561 m (1,840 ft)
(Colors are for dry soil unless otherwise stated.)

A--0 to 18 cm (0 to 7 in); reddish brown (5YR 4/3), interior, fine sandy loam, dark reddish brown (5YR 3/3), interior, moist; weak fine and medium granular structure; slightly hard, very friable; common very fine to medium roots throughout; many very fine and fine pores; noneffervescent; 3 percent rounded gravel; neutral; clear smooth boundary. Thickness is 10 to 51 cm (4 to 20 in)

Bt--18 to 61 cm (7 to 24 in); yellowish red (5YR 5/6), interior, sandy loam, and yellowish red (5YR 4/6), interior, moist; moderate medium and coarse prismatic structure parting to moderate medium subangular blocky; hard, friable; common very fine and fine roots throughout; common very fine and fine pores; common distinct discontinuous clay bridging between sand grains; noneffervescent; 5 percent rounded gravel; neutral; gradual smooth boundary. Thickness is 15 to 102 cm (6 to 40 inches thick)

BC--61 to 102 cm (24 to 40 in); reddish yellow (5YR 6/6), interior, loamy sand, yellowish red (5YR 5/6), interior, moist; weak medium prismatic structure parting to weak medium subangular blocky; hard, friable; common very fine and fine roots throughout; common very fine and fine pores; noneffervescent; 5 percent rounded gravel; neutral; gradual smooth boundary. Thickness is 15 to 91 cm (6 to 36 inches thick)

C--102 to 178 cm (40 to 70 in); reddish yellow (7.5YR 6/8), interior, loamy sand, strong brown (7.5YR 5/8), interior, moist; massive; slightly hard, friable; noneffervescent; 5 percent rounded gravel; neutral.

TYPE LOCATION:
Woods County, Oklahoma; about 8 miles north and 8 miles west of Freedom; about 550 feet north and 950 feet west of the southeast corner of Sec. 20, T. 28 N., R. 19 W.; Indian meridian

USGS topographic quadrangle: Lookout, Oklahoma
Latitude: 36 degrees, 53 minutes, 11.67 seconds N
Longitude: 99 degrees, 15 minutes, 45.12 seconds W
Datum: WGS84

Decimal Degrees
Std Latitude: 36.8865750
Std Longitude: -99.2625333

RANGE IN CHARACTERISTICS:
Soil Moisture: Typic Ustic soil moisture regime
Thickness of the ochric epipedon: 10 to 51 cm (4 to 20 in); although the colors may, either the thickness or the organic matter content does not meet the requirements of a mollic epipedon
Depth to identifiable secondary carbonate: more than 76 cm (30 in)

Particle-size control section (weighted average):
Total clay content: 10 to 18 percent
Sand content: 40 to 80 percent
Rock fragments: 1 to 15 percent

A horizon:
Hue: 5YR, 7.5YR, 10YR
Value: 4 to 5 (3 to 4 moist)
Chroma: 2 to 4
Texture: sandy loam, fine sandy loam, loam, loamy fine sand
Total clay content: 5 to 15 percent
Sand content: 40 to 85 percent
Rock fragments: 0 to 15 percent total; fine to medium siliceous gravel
Effervescence: none
Reaction (pH): slightly acid to slightly alkaline (6.1-7.8)

Bt horizons:
Hue: 5YR, 7.5YR, 10YR
Value: 4 to 6 (3 to 5 moist)
Chroma: 3 to 6
Texture: sandy loam, fine sandy loam, loam
Total clay content: 10 to 18 percent
Sand content: 40 to 85 percent
Rock fragments: 1 to 15 percent total; siliceous gravel
Calcium carbonate equivalent: 0 to 5 percent
Effervescence: none to slight
Reaction (pH): slightly acid to moderately alkaline (6.1-8.4)

BC horizons:
Hue: 5YR, 7.5YR, 10YR
Value: 5 to 7 (4 to 6 moist)
Chroma: 4 to 6
Texture: coarse sandy loam, sandy loam, loamy sand, or loamy coarse sand
Total clay content: 4 to 15 percent
Sand content: 50 to 85 percent
Rock fragments: 1 to 15 percent total; siliceous gravel
Identifiable secondary carbonate: 0 to 5 percent; films, masses, threads
Calcium carbonate equivalent: 0 to 5 percent
Effervescence: none to strong
Reaction (pH): slightly acid to moderately alkaline (6.1-8.4)

C horizons:
Hue: 5YR, 7.5YR, 10YR
Value: 5 to 8 (4 to 7 moist)
Chroma: 4 to 8
Texture: ranges from fine sandy loam to coarse sand and their gravelly counterparts; some pedons may be stratified below 102 cm (40 in)
Total clay content: 2 to 12 percent
Sand content: 50 to 95 percent
Rock fragments: 1 to 35 percent total, but some thin strata may contain more; 1 to 35 percent siliceous gravel; 0 to 3 percent cobbles
Identifiable secondary carbonate: 0 to 5 percent; films, masses, threads
Calcium carbonate equivalent: 0 to 10 percent
Effervescence: none to strong
Reaction (pH): neutral to moderately alkaline (6.6-8.4)

COMPETING SERIES:
This is the Devol series in the same family. Similar soils are the Arnett, Farry, Grandfield, Kingsdown, Madge, and Wisby series.
Arnett soils: have a fine-loamy particle-size class
Devol soils: formed in eolian material and contain less than 2 percent fragments in the solum
Farry and Madge soils: have a mollic epipedon and have a fine-loamy particle-size class
Grandfield soils: have a fine-loamy particle-size class and contain less than 2 percent fragments in the solum
Kingsdown soils: formed in eolian material, have a mollic epipedon, and have identifiable secondary carbonates within 38 cm (15 in) of the surface
Wisby soils: have a mollic epipedon and occur in a wetter climate

GEOGRAPHIC SETTING:
Parent material: loamy and sandy alluvium
Landscape: alluvial plains, dissected plains
Landform: hillslopes, paleoterraces, stream terraces, and terrace remnants
Slope: 1 to 15 percent
Precipitation Pattern: The soil is intermittently moist in some part from April thru June, September, and October. The driest months are typically December thru February, July, and August.
Mean annual precipitation: 559 to 762 mm (22 to 30 in)
Thornthwaite P-E Index: 32 to 44
Mean annual air temperature: 13.9 to 17.8 degrees C (57 to 64 degrees F)
Frost-free period: 180 to 230 days
Elevation: 426.7 to 701.0 m (1,400 to 2,300 ft)

GEOGRAPHICALLY ASSOCIATED SOILS:
These are the Arnett, Farry, Hardeman, Quinlan, Southside, and Woodward series.
Arnett and Farry soils: occur on higher or less sloping areas and have a fine-loamy particle-size class
Hardeman soils: occur on lower areas and do not have an argillic horizon
Quinlan and Woodward soils: occur on lower side slopes, do not have an argillic horizon, and are less than 102 cm (40 in) deep to sandstone
Southside soils: occur on similar areas, do not have an argillic horizon, and have a sandy particle-size class

DRAINAGE AND PERMEABILITY:
Drainage class: Well drained
Permeability class: moderately rapid
Runoff class: very low on 1 to 5 percent slopes and low on 5 to 15 percent slopes

USE AND VEGETATION:
Major uses: mainly for livestock grazing, but some less sloping areas are used for crop production
Native vegetation: a mixed grass prairie including sideoats grama, little bluestem, blue grama, buffalograss, sand lovegrass, sand bluestem, and switchgrass
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: Sandy Loam

DISTRIBUTION AND EXTENT:
General area: Western Oklahoma, a few counties in southern Kansas, and possibly northwestern Texas
Land Resource Region: H - Central Great Plains Winter Wheat and Range Region
MLRA 78B & 78C - Central Rolling Red Plains, Western and Eastern Parts
Extent: Moderate

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

SERIES ESTABLISHED: Woods County, Oklahoma; 1995.

REMARKS:
These soils were formerly included with the Albion series.

Diagnostic horizons and features recognized in this pedon are:
Particle-size control section: 18 to 61 cm (7 to 24 in)
Ochric epipedon: 0 to 18 cm (0 to 7 in) (A horizon)
Argillic horizon: 18 to 61 cm (7 to 24 in) (Bt horizon)

TAXONOMIC VERSION: Keys to Soil Taxonomy, Twelfth Edition, 2014

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National Cooperative Soil Survey
U.S.A.