LOCATION DURANT                  OK

Established Series
Rev. JDN:ELC:JWF
01/2017

DURANT SERIES

The Durant series consists of very deep, moderately well drained, very slowly permeable soils that formed in clayey residuum weathered from clayey deposits and shales of Cretaceous age. These nearly level to gently sloping soils occur mainly on shoulders and summits of ridges on hills in the Grand Prairie, MLRA 85. Slopes are 0 to 6 percent. Mean annual precipitation is 1143 mm (45 in). Mean annual temperature is 16.7 degrees C (62 degrees F).

TAXONOMIC CLASS: Fine, smectitic, thermic Udertic Argiustolls

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

Ap--0 to 20 cm (0 to 8 in); dark grayish brown (10YR 4/2) loam, very dark grayish brown (10YR 3/2) moist; moderate fine granular structure; slightly hard, friable; moderately acid; gradual smooth boundary. Thickness is 15 to 30 cm (6 to 12 in)

BA--20 to 28 cm (8 to 11 in); brown (10YR 5/3) silty clay loam, dark brown (10YR 3/3) moist; moderate fine and medium subangular blocky structure; hard, firm; few fine distinct reddish brown (5YR 5/4) redox concentrations; moderately acid; gradual smooth boundary. Thickness is 0 to 20 cm (0 to 8 in)

Bt1--28 to 76 cm (11 to 30 in); light olive brown (2.5Y 5/4) clay, olive brown (2.5Y 4/4) moist; moderate medium subangular blocky structure; very hard, very firm; many shiny pressure faces on peds; common dark stains on faces of peds; common medium prominent yellowish red (5YR 5/6) redox concentrations; moderately acid; gradual smooth boundary. Thickness is 25 to 76 cm (10 to 30 in)

Bt2--76 to 119 cm (30 to 47 in); brown (10YR 5/3) clay, brown (10YR 4/3) moist; weak medium angular blocky structure; very hard, very firm; many shiny pressure faces on peds; common dark stains on faces of peds; few fine faint light brownish gray (10YR 6/2) redox depletions; neutral; gradual smooth boundary. Thickness is 25 to 51 cm (10 to 20 in)

Bt3--119 to 163 cm (47 to 64 in); light olive brown (2.5Y 5/4) clay, olive brown (2.5Y 4/4) moist; weak coarse angular blocky structure; extremely hard, very firm; few shiny pressure faces on peds; few fine faint grayish brown (10YR 5/2) redox depletions; few fine calcium carbonate concretions; moderately alkaline.

TYPE LOCATION: Bryan County, Oklahoma; about 4 miles west and 1 mile north of Albany; about 900 feet north and 150 feet east of the southwest corner of section 35, Township 7 S., Range 10 E.
USGS topographic quadrangle: Blue, Oklahoma;
Latitude: 33 degrees, 53 minutes, 53.74 seconds N;
Longitude: 96 degrees, 13 minutes, 59.75 seconds W;
Datum: WGS84

RANGE IN CHARACTERISTICS:
Soil Moisture: Udic ustic soil moisture regime; Moisture control section is dry in some part for about 90 days to 135 days per year.
Thickness of mollic epipedon: 25 to 51 cm (10 to 20 in)
Depth to argillic horizon: 15 to 50 cm (6 to 20 in)
Depth to identifiable secondary carbonates: 76 to 152 cm (30 to 60 in)

Particle-size control section (weighted average)
Clay content: 35 to 60 percent

A Horizon:
Hue: 7.5YR to 10YR
Value: 4 to 5
Chroma: 2 to 3
Texture: loam, silt loam, or clay loam
Clay content: 20 to 35 percent
Reaction (pH): strongly acid to slightly acid (5.1 - 6.5)

BA Horizon:
Hue: 7.5YR to 10YR
Value: 4 to 6
Chroma: 2 to 4
Texture: clay loam, silty clay loam, or clay
Clay content: 28 to 50 percent
Redox concentrations: in shades of brown, red and yellow
Reaction (pH): strongly acid to neutral (5.1 - 7.3)

Upper Bt Horizons:
Hue: 7.5YR to 2.5Y
Value: 4 to 6
Chroma: 2 to 6
Texture: clay
Clay content: 40 to 60 percent
Redox concentrations: in shades of brown, red and yellow
Redox depletions: in shades of gray
Sodium adsorption ratio: 0 to 6
Exchangable sodium percentage: 1 to 14
Reaction (pH): moderately acid to slightly alkaline (5.6 - 7.8)

Lower Bt or BC Horizons:
Hue: 7.5YR to 2.5Y
Value: 4 to 7
Chroma: 2 to 6
Texture: silty clay or clay
Clay content: 40 to 50 percent
Redox concentrations: in shades of red and yellow
Redox depletions: in shades of gray
Identifiable secondary carbonates: 0 to 5 percent; concretions, nodules, and/or masses
Sodium adsorption ratio: 0 to 12
Exchangable sodium percentage: 1 to 14
Reaction (pH): slightly acid to moderately alkaline (6.1 - 8.4)

C or Cd Horizons (where present):
Some pedons have shale or claystone below a depth of 163 cm (64 in)

COMPETING SERIES: These are Benchley, Caradan, Flatonia, and Foraker series in the same family.
Benchley soils: have warmer average soil temperatures and longer growing seasons.
Caradan soils: have hues of 7.5YR or redder and identifiable secondary carbonates within 76 cm (30 in) of the surface.
Flatonia soils: are less than 152 cm (60 in) deep to siltstone or mudstone of Tertiary age and have warmer average soil temperatures.
Foraker soils: are less than 102 cm (40 in) deep to silty shale.

GEOGRAPHIC SETTING:
Parent material: clayey residuum weathered from clayey shale and/or claystone deposits of Cretaceous age
Landscape: Hills
Landform: flat to slightly convex summits, shoulders, and backslopes of broad ridges
Slope: 0 to 6 percent
Mean annual precipitation: 940 to 1143 mm (37 to 45 in)
Thornthwaite P-E Index: 50 to 70
Mean annual air temperature: 15.6 to 17.8 degrees C (60 to 64 degrees F)
Frost-free period: 210 to 230 days
Elevation: 152.4 to 365.8 m (500 to 1200 ft)

GEOGRAPHICALLY ASSOCIATED SOILS: These are Burleson, Clarita, Crockett, Garvin, Heiden, Normangee and Wilson series.
Burleson soils: occur on similar positions and do not have an argillic horizon.
Clarita and Heiden soils: usually occur on lower side slopes below Durant soils and do not have an argillic horizon.
Crockett and Normangee soils: occur on similar positions and do not have a mollic epipedon.
Garvin soils: do not have an argillic horizon and occur on lower flood plains
Wilson soils: occur on slightly lower positions, do not have a mollic epipedon, and have a perched water table within 1 foot of the surface.

DRAINAGE AND PERMEABILITY: Moderately well drained; Permeability is very slow; Runoff is high on less than 1 percent slopes and very high on graater than 1 percent slopes.

USE AND VEGETATION: Used for cotton, small grains, grain sorghums, tame pasture, and range. The native vegetation is tall grass.

DISTRIBUTION AND EXTENT: Southcentral Oklahoma; MLRA 85 - Grand Prairie of Oklahoma. The series is of moderate extent.

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

SERIES ESTABLISHED: Bryan County, Oklahoma; 1906.

REMARKS:

Edited 01/2017 (RFG-SCP): Converted to tabular format and added metric units. Updated competing series, geographic setting, and associated soils sections.

Diagnostic horizon and features in this pedon are:
Particle size control section: 28 to 79 cm (11 to 31 in)
Mollic epipedon 0 to 28 cm (0 to 11 in) (A and BA horizons).
Argillic horizon 28 to 163 cm (11 to 64 in) (Bt horizons).
Udertic classification: Moisture control section is dry in some part from about 90 days to 135 days per year; cracks greater than 1 cm wide and 30 inches deep are present during dry periods.

ADDITIONAL DATA: NASIS Pedon ID S1991OK013001, KSSL Laboratory Pedon No. 92P0256
Oklahoma State University laboratory data 76-OK-48-6 and State of Oklahoma, Department of Highways, Materials Division laboratory data S68-OK-010-002.

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

---

National Cooperative Soil Survey
U.S.A.