LOCATION ERAM OK+KS MOEstablished Series
TAXONOMIC CLASS: Fine, mixed, active, thermic Aquic Argiudolls
TYPICAL PEDON: Eram clay loam--in rangeland. (Colors are for moist soil unless otherwise stated.)
A--0 to 25 centimeters (0 to 10 inches); very dark grayish brown (10YR 3/2) clay loam; dark grayish brown (10YR 4/2) dry; moderate medium granular structure; hard, firm; slightly acid; gradual smooth boundary. (15 to 36 centimeters (6 to 14 inches thick)
Bt--25 to 46 centimeters (10 to 18 inches); very dark grayish brown (10YR 3/2) clay; few fine faint light olive brown redoximorphic concentration masses; moderate medium blocky structure; extremely hard, very firm; nearly continuous clay films on faces of peds; slightly acid; gradual smooth boundary. (15 to 36 centimeters (6 to 14 inches thick)
BC--46 to 76 centimeters (18 to 30 inches); brown (10YR 4/3) clay; few fine faint gray redoximorphic depletion masses; weak coarse blocky structure; extremely hard, very firm; slightly acid; gradual smooth boundary. (15 to 41 centimeters (6 to 16 inches) thick)
Cr--76 to 102 centimeters (30 to 40 inches); gray and olive shale; slightly acid in upper part becoming alkaline with depth.
TYPE LOCATION: Okmulgee County, Oklahoma; about 8 kilometers (5 miles) northeast of Beggs; 167 meters (550 feet) north and 91 meters (300 feet) east of the southwest corner of sec. 3, T. 15 N., R. 12 E.
RANGE IN CHARACTERISTICS:
Depth to bedrock: range from 51 to 102 centimeters (20 to 40 inches).
Particle size control section (weighted average):
Clay content: 35 to 55 percent
Sand Content: 4 to 10 percent
A horizon:
Hue: 7.5YR to 5Y
Value: 2 or 3
Chroma: 2 or 3
Texture: silt loam, clay loam, silty clay loam, or silty clay
Sandstone fragments: less than 3 inches in diameter make up 0 to 15 percent by volume
Reaction: moderately acid or slightly acid
Bt horizon:
Hue: 5YR to 2.5Y
Value: 3 to 5
Chroma: 2 to 4
Pedons with value of 4 or 5 and chroma of 3 or 4 have redoximorphic depletions with value of 4 or more and chroma of 2 or less.
Texture: clay loam, silty clay loam, silty clay, or clay
Clay content: 35 to 55 percent
Reaction: strongly acid to moderately alkaline
BC horizon:
Hue: 5YR to 2.5Y
Value: 4 to 7
Chroma: 2 to 6
Redoximorphic features are in shades of gray, brown, and red.
Texture: clay loam, silty clay loam, silty clay, or clay
Reaction: strongly acid to moderately alkaline
Cr horizon:
Parent Material: gray or olive shales or compacted clay beds interbedded with thin layers of sandstone.
Excavation difficulty: moderate to high
Reaction: slightly acid to moderately alkaline
COMPETING SERIES: These are the
Dennis and the
Garton series.
Dennis and Garton soils have a solum more than 152 centimeters (60 inches) thick.
GEOGRAPHIC SETTING:
Landform: very gently sloping to moderately steep ridges and sideslopes of hills in the Cherokee Prairies.
Parent material: formed in shales interbedded with thin layers of sandstone of Pennsylvanian age.
Slopes: 1 to 20 percent
Mean annual precipitation ranges from 89 to 117 centimeters (35 to 46 inches)
Mean annual temperature ranges from 14 to 17 degrees C. (57 to 63 degrees F.)
Thornthwaite annual P-E indices: 64 to 80
Frost free days: 200 to 220.
GEOGRAPHICALLY ASSOCIATED SOILS: These are the
Collinsville,
Coweta,
Dennis,
Kenoma,
Okemah,
Talihina and
Woodson series.
Dennis, Kenoma, and Okemah soils occur on lower broad smooth slopes.
Talihina soils occur on higher ridge crests
Collinsville and Coweta soils lack Bt horizons, have a solum less than 51 centimeters (20 inches) thick over sandstone bedrock, and occur on higher ridge crests.
Woodson soils have an abrupt textural boundary between the A and Bt horizon and occur on lower broad smooth slopes.
DRAINAGE AND SATURATED HYDRAULIC CONDUCTIVITY:
Drainage: moderately well drained
Runoff: high to very high
Saturated hydraulic conductivity: very low (based on water table depth at less than 50 centimeters (20 inches)
Episaturation: 31 to 61 centimeters (12 to 24 inches) during the winter and spring. The bottom of the water table is at a depth of about 76 centimeters (30 inches)
USE AND VEGETATION: Used mainly for range.
Native vegetation is tall grass prairie.
Some areas are cultivated to small grains, grain sorghums, soybeans, alfalfa, and tame pasture.
DISTRIBUTION AND EXTENT: Cherokee Prairies (MLRA 112) of Oklahoma, Kansas, and Missouri. The series is moderately extensive.
MLRA OFFICE RESPONSIBLE: Salina, Kansas
SERIES ESTABLISHED: Okfuskee County, Oklahoma; 1942.
REMARKS: Diagnostic horizons and features recognized in this pedon are:
Mollic epipedon: 0 to 46 centimeters (0 to 18 inches) (the A and Bt horizons)
Argillic horizon: 25 to 46 centimeters (10 to 18 inches) (the Bt horizon)
Paralithic contact: Weathered bedrock 76 centimeters (30 inches) (Cr horizon)
Aquic: aquic conditions for some time in most years either within 40 cm (16 inches) of the mineral soil surface, in horizons that also have redoximorphic features; or directly below the mollic epipedon, in one or more horizons with a total thickness of 15 cm (6 inches) or more that have one or more of the following:
a. A color value, moist, of 4 or more and redoximorphic depletions with a chroma of 2 or less; or
b. A hue of 10YR or redder and a chroma of 2 or less; or
c. A hue of 2.5Y or yellower and a chroma of 3 or less
Moisture Regime: Udic
Soil Interpretation Record: Series OK0096
Modified format by LRM in 1/2006 to include metric conversion and change permeability to saturated hydraulic conductivity.