LOCATION FRANKIRK                TX+OK

Established Series
Rev. ARG-RFG-DDR
11/2013

FRANKIRK SERIES

The Frankirk series comprises very deep, well drained, moderately slowly or slowly permeable soils that formed in loamy alluvium of Quaternary age. These soils occur on gently sloping terraces on dissected plains. Slopes range from 0 to 5 percent. Mean annual precipitation is about 635 mm (25 in) and mean annual temperature is about 17.2 degrees C (63 degrees F).

TAXONOMIC CLASS: Fine, mixed, superactive, thermic Typic Argiustolls

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

Ap--0 to 18 cm (0 to 7 in); reddish brown (5YR 5/3) clay loam, dark reddish brown (5YR 3/3) moist; weak fine granular structure; slightly hard, friable; neutral; abrupt smooth boundary. Thickness is 13 to 23 cm (5 to 9 in)

Bt1--18 to 41 cm (7 to 16 in); reddish brown (5YR 4/3) clay loam, dark reddish brown (2.5YR 3/3) moist; weak coarse prismatic structure parting to moderate medium angular blocky; hard, firm; nearly continuous clay films; slightly alkaline; gradual smooth boundary. Thickness is 13 to 28 cm (5 to 11 in)

Bt2--41 to 89 cm (16 to 35 in); reddish brown (2.5YR 4/4) clay, dark reddish brown (2.5YR 3/4) moist; weak coarse prismatic structure parting to moderate medium angular blocky; hard, firm; nearly continuous clay films; slightly alkaline; gradual smooth boundary. Thickness is 38 to 61 cm (15 to 24 in)

Bt3--89 to 122 cm (35 to 48 in); red (2.5YR 5/6) clay loam, red (2.5YR 4/6) moist; moderate medium subangular blocky structure; hard, friable; nearly continuous clay films; slightly effervescent; moderately alkaline; diffuse smooth boundary. Thickness is 20 to 51 cm (8 to 20 in)

Btk--122 to 163 cm (48 to 64 in); yellowish red (5YR 5/6) sandy clay loam, yellowish red (5YR 4/6) moist; moderate medium subangular blocky structure; hard, friable; clay films on some peds; contains about 2 percent by volume of calcium carbonate concretions; strongly effervescent; moderately alkaline; gradual smooth boundary. Thickness is 0 to 46 cm (0 to 18 in)

Bk--163 to 216 cm (64 to 85 in); reddish yellow (5YR 6/6) sandy clay loam, yellowish red (5YR 5/6) moist; weak fine granular structure; hard, friable; contains 5 percent by volume of calcium carbonate concretions; strongly effervescent; moderately alkaline; diffuse smooth boundary. Thickness is 30 to 64 cm (12 to 25 in)

C--216 to 254 cm (85 to 100 in); yellowish red (5YR 5/6) loam, yellowish red (5YR 4/6) moist; massive; hard, friable; strongly effervescent; moderately alkaline.

TYPE LOCATION: Stonewall County, Texas from the intersection of U.S. Highway 380 and Farm Road 1835 0.1 mile north of the Post Office in Old Glory, 2.6 miles east on a county road, 100 feet north in a cultivated field. USGS topographic quadrangle: ?, TX; Latitude: 33 degrees, 7 minutes, 10.49 seconds N; Longitude: 100 degrees, 0 minutes, 42.08 seconds W; Datum: NAD83.

RANGE IN CHARACTERISTICS:
Solum thickness: 152 to more than 203 cm (60 to >80 in)
Mollic epipedon thickness: 28 to 46 cm (11 to 18 in)
Depth to secondary calcium carbonate: 74 to 122 cm (29 to 48 in)
Depth to a calcic horizon(where present): more than 152 cm (60 in)

Particle-size control section (weighted average)
Total clay content: 35 to 45 percent
Rock fragments: 0 to 3 percent; siliceous gravel less than 5 cm (2 in) across the long axis

A horizon
Hue: 5YR, 7.5YR
Value: 3 to 5
Chroma: 2 or 3
Texture: loam, sandy clay loam, clay loam
Reaction(pH): neutral to slightly alkaline (6.6 - 7.8)

Bt1 Horizon
Hue: 2.5YR to 7.5YR
Value: 4 or 5
Chroma: 2 or 3
Texture: sandy clay loam, clay loam, silty clay loam, clay
Total Clay content: 30 to 45 percent
Reaction(pH): neutral to moderately alkaline (6.6 - 8.4)

Bt2 and Bt3 Horizons
Hue: 2.5YR or 5YR
Value: 4 or 5
Chroma: 4 to 6
Texture: clay loam, sandy clay, Silty clay loam, clay
Total Clay content: 35 to 45 percent
CaCO3 clay content: 0 to 2 percent
Calcium Carbonate equivalent: 0 to 5 percent
Reaction(pH): neutral to moderately alkaline (6.6 - 8.4)

Btk Horizon
Hue: 2.5YR or 5YR
Value: 4 to 6
Chroma: dominantly 6
Texture: sandy clay loam, silty clay loam, loam, clay loam
Total clay content: 20 to 35 percent
CaCO3 clay content: 0 to 3 percent
Rock Fragments: 0 to 10 percent gravel
Identifiable secondary carbonates: 2 to 10 percent; concretions
Calcium carbonate equivalent: 3 to 10 percent
Reaction(pH): moderately alkaline (7.9 - 8.4)

Bk Horizon
Hue: 2.5YR or 5YR
Value: 4 to 6
Chroma: dominantly 6
Texture: sandy clay loam, silty clay loam, loam, clay loam
Total clay content: 20 to 35 percent
CaCO3 clay content: 1 to 7 percent
Rock Fragments: 0 to 10 percent gravel
Identifiable secondary carbonates: 2 to 20 percent; concretions
Calcium carbonate equivalent: 5 to 15 percent
Reaction(pH): moderately alkaline (7.9 - 8.4)

C Horizon
Texture: sandy clay loam, loam, clay loam
Total clay content: 20 to 30 percent
Rock Fragments: 0 to 10 percent gravel
Calcium carbonate equivalent: 2 to 10 percent
Reaction(pH): moderately alkaline (7.9 - 8.4)

COMPETING SERIES:
These are the La Casa, Lawton, Luckenbach, Pyron, Rowden, Sagerton, and Swenson soils in the same family.
La Casa and Pyron soils have a calcic horizon at less than 152 cm (60 in) depths and have secondary carbonates at less than 64 cm (25 in)
Lawton soils do not have secondary carbonates within 122 cm (48 in) and formed from granitic outwash
Luckenbach soils have secondary carbonates within a depth of 71 cm (28 in) and do not have a calcic horizon
Rowden and Swenson soils are 51 to 102 cm (20 to 40 in) deep to bedrock

GEOGRAPHIC SETTING:
Parent material: loamy alluvium of Quaternary age
Landscape: dissected plains
Landform: nearly level to gently sloping treads of terraces
Slope: 0 to 5
Mean annual precipitation: 533 to 711 mm (21 to 28 in)
Thornthwaite annual P-E Index: 31 to 44
Mean annual air temperature 13.9 to 18.3 degrees C (57 to 65 degrees F)
Frost-free period: 185 to 240 days
Elevation: 304.8 to 792.5 m (1000 to 2600 ft)

GEOGRAPHICALLY ASSOCIATED SOILS:
These are the Abilene, Aspermont, Bukreek, Miles, Rotan, and Sagerton series.
Abilene and Sagerton soils: occur on similar positions with secondary carbonates at less than 71 cm (28 in) and have a calcic horizon at less than 152 cm (60 in) depths.
Aspermont soils: do not have a mollic epipedon or an argillic horizon and occur on higher positions.
Bukreek and Miles soils: have less than 35 percent clay in the particle-size control section and occur on similar positions.
Rotan soils: have secondary carbonates within 71 cm (28 in) of the surface and occur on similar or slightly lower positions with slopes mainly less than 1 percent.

DRAINAGE AND PERMEABILITY: Well drained. Permeability is moderately slow and slow. Runoff is low on slopes of less than 1 percent and medium on 1 to 5 percent slopes.

USE AND VEGETATION: The major use is crop production. Wheat, cotton, and grain sorghum are the principle crops. The native plant community is mixed grasses and main species are buffalograss, blue grama, sideoats grama and silver bluestem.

DISTRIBUTION AND EXTENT: Central Rolling Red Plains, Western and Eastern Parts (MLRA 78B, 78C) of Texas and Oklahoma. This series is of moderate extent (MLRA 78B, 78C) of Texas and Oklahoma. The series has moderate extent.

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

SERIES ESTABLISHED: Stonewall County, Texas; 1970.

REMARKS: The Frankirk soils were formerly included in the Olton and Wichita series.

Edited 11/2013 (RFG-ROG): Converted to tabular format and added metric measurements. Added slow permeability.

Diagnostic horizons and features recognized in this pedon are:
Particle size control section: 18 to 68 cm (7 to 26 in)
Mollic epipedon - 0 to 41 cm (0 to 16 in). (A, Bt1 horizons)
Argillic horizon - 18 to 163 (7 to 64 in) (Bt,Btk horizons)
Calcic horizon - 163 to 216 cm (64 to 85 in)(Bk horizon)

ADDITIONAL DATA: None

Taxonomic Version: Keys to Soil Taxonomy, Eleventh Edition, 2010.

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National Cooperative Soil Survey
U.S.A.