LOCATION GARTON OKEstablished Series
TAXONOMIC CLASS: Fine, mixed, active, thermic Aquic Argiudolls
TYPICAL PEDON: Garton silt loam--cultivated.
(Colors are for moist soil uless otherwise stated.)
Ap--O to 6 inches; very dark gray (10YR 3/1) silt loam; dark gray (10YR 4/1) dry; moderate medium and fine granular structure; friable; neutral; clear smooth boundary. (5 to 8 inches thick)
BA--6 to 17 inches; very dark gray (10YR 3/1) silty clay loam, dark gray (10YR 4/1) dry; few fine faint light gray mottles; moderate medium and fine subangular blocky structure; firm; neutral; gradual smooth boundary. (10 to 24 inches thick)
Bt1--17 to 26 inches; dark brown (7.5YR 3/2) silty clay loam, brown (7.5YR 4/2) dry; few medium distinct reddish brown (5YR 5/4) mottles; moderate medium and fine granular structure; firm patchy clay films or pressure faces on surfaces of peds; slightly acid; clear smooth boundary. (8 to 20 inches thick)
Bt2--26 to 42 inches; reddish brown (5YR 5/4) clay loam; weak medium and fine subangular blocky structure; friable; clay films or pressure faces on surfaces of peds; neutral; graudal smooth boundary. (10 to 24 inches thick)
BC--42 to 65 inches; yellowish red (5YR 5/6) loam, with thin strata of reddish yellow (5YR 6/8) loam, weak fine subangular blocky structure; very friable; few calcium carbonate concretions; mildly alkaline.
TYPE LOCATION: McCurtain County, Oklahoma; about 7 miles south of Idabel; 2,400 feet west and 1,800 feet south of the northeast corner of sec. 5, T. 9 S., R. 24 E.
RANGE IN CHARACTERISTICS: Solum thickness ranges from 33 to more than 65 inches.
The A horizon has hue of 7.5YR or 10YR, value of 2 or 3, and chroma of 1 or 2. It is silt loam, loam, silty clay loam, or clay loam and is medium acid to neutral.
The BA horizon has hue of 7.5YR or 10YR, value of 2 to 4, and chroma of 1 or 2. Some pedons have brownish or reddish mottles. This horizon is silty clay loam or clay loam and is medium acid to neutral.
The Bt1 horizon has hue of 5YR or 7.5YR, value of 3 or 4, and chroma of 2 to 4. It has reddish or brownish mottles. The Bt horizon is
clay loam, silty clay loam, silty clay, or clay. It ranges from slightly acid to mildly alkaline.
The Bt2 horizon has hue of 2.5YR, 5YR, or 7.5YR, value of 4 or 5, and chroma of 3 to 6.
The BC horizon has hue of 5YR or 7.5YR, value of 4 to 6, and chroma of 4 to 8. It is loam, silty clay loam, or clay loam and neutral to mildly alkaline. Content of calcium carbonate concretions ranges from few to common.
COMPETING SERIES: These are the Eram series of the same family and the Ashwood, Bonham and Caney series of similar families. Eram soils are underlain by alkaline shale between depths of 20 to 40 inches and are no redder than 10YR throughout. Ashwood and Caney soils lack wetness mottles within 16 inches of the surface. Bonham soils have higher content of clay in the lower Bt horizon, lack 5YR hue in the lower Bt horizon, and have high chroma mottles in the lower Bt horizon.
GEOGRAPHIC SETTING: Garton soils are on low stream terraces and are rarely flooded. Slope gradients are less than 1 percent. The soil formed in loamy and clayey sediments. Average annual precipitation is 40 to 50 inches; mean annual air temperature is 62 degrees to 65 degrees F.; Thornthwaite P-E index is 64 to 80.
GEOGRAPHICALLY ASSOCIATED SOILS: These are the Caspiana, Gallion, Pledger, and Roebuck series. Caspiana and Gallion soils are in slightly higher positions on the outer edge of stream terraces. Pledger and Roebuck soils are usually in lower positions on the back side of terraces in more frequently flooded positions. Caspiana and Gallion soils have less than 35 percent clay in the control section. Pledger soils lack an argillic horizon and have soft powdery carbonates between depths of 24 to 60 inches. Roebuck soils lack an argillic horizon and have COLE of more than 0.09.
DRAINAGE AND PERMEABILITY: Garton soils are moderately well drained. Runoff is slow; permeability is slow.
USE AND VEGETATION: Nearly all areas are used for cropland, tame pasture, or native pasture. Cotton, corn, soybeans, grain sorghums, and alfalfa hay are the principal crops. Native vegetation is eastern cottonwood, sweetgum, green ash, American sycamore, American elm, and pecan.
DISTRIBUTION AND EXTENT: Southern Oklahoma, possibly Arkansas, Louisiana, and Texas. The soil is of small extent.
MLRA SOIL SURVEY REGIONAL OFFICE (MO) RESPONSIBLE: Temple, Texas
SERIES ESTABLISHED: McCurtain County, Oklahoma; 1970.
REMARKS: Garton soils were formerly included in the McLain series.