LOCATION MATOY OKEstablished Series
TAXONOMIC CLASS: Fine, smectitic, thermic Udertic Haplustolls
TYPICAL PEDON: Matoy silty clay loam--pasture. (Colors are for dry soil unless otherwise stated.)
A1--0 to 10 inches; dark grayish brown (10YR 4/2) silty clay loam, very dark brown (10YR 2/2) moist; moderate fine granular structure; hard, firm; neutral; gradual smooth boundary. (6 to 20 inches thick)
B21--10 to 14 inches; brown (10YR 4/3) silty clay loam, dark brown (10YR 3/3) moist; moderate fine and medium subangular blocky structure; hard, firm; nearly continuous clay films on faces of peds; few organic stains on faces of peds; few limestone fragments; neutral; gradual smooth boundary. (3 to 10 inches thick)
B22--14 to 24 inches; brown (10YR 5/3) silty clay loam, brown (10YR 4/3) moist; moderate fine and medium blocky structure; hard, firm; nearly continuous clay films on faces of peds; few organic stains on faces of peds; few fine concretions; few fine limestone fragments; neutral; gradual smooth boundary. (6 to 15 inches thick)
B23--24 to 31 inches; pale brown (10YR 6/3) silty clay, brown (10YR 4/3) moist; moderate fine and medium blocky structure; very hard, very firm; nearly continuous clay films on faces of peds; few organic stains; few slickensides that do not intersect; few fine limestone fragments and concretions; mildly alkaline; gradual smooth boundary. (6 to 10 inches thick)
Bca--31 to 38 inches; light olive brown (2.5Y 5/4) gravelly silty clay, olive brown (2.5Y 4/4) moist; weak fine blocky structure; very hard, very firm; patchy clay films on faces of peds; common fine lime concretions; few sea shells; few limestone fragments; calcareous, moderately alkaline.
R--38 to 40 inches; limestone bedrock.
TYPE LOCATION: Bryan County, Oklahoma; about 9 miles northeast of Durant, Oklahoma; 860 feet west and 1320 feet south of the northeast corner in sec. 15, T. 5 S., R. 10 E.
RANGE IN CHARACTERISTICS: Solum thickness ranges from 20 to 40 inches and coincides with the depth to b Thickness of mollic epipedon ranges from 10 to 30 inches. Depth to lime ranges from 12 to 36 inches.
The A horizon is very dark gray (10YR 3/1), dark gray (10YR 4/1), dark grayish brwon (10YR 4/2), and grayish brown (10YR 5/2). It is silty clay loam or clay loam. The A horizon ranges from slightly acid through mildly alkaline.
The B2 horizon is brown (10YR 4/3, 5/3; 7.5YR 5/4), grayish brown (10YR 5/2; 2.5Y 5/2), pale brown (10YR 6/3), yellowish brown (10YR 5/4, 5/6), light olive brown (2.5Y 5/4, 5/6), olive yellow (2.5Y 6/6), light yellowish brown (2.5Y 6/4), and light brownish gray (2.5Y 6/2). It is silty clay loam, silty clay, or clay (35 to 50 percent clay) and ranges from neutral through moderately alkaline.
The Bca horizon is light brownish gray (10YR 6/2; 2.5Y 6/2), light gray (10YR 7/2; 2.5Y 7/2), white (10YR 8/2; 2.5Y 8/2), very pale brown (10YR 7/3, 8/3), pale brown (10YR 6/3), light yellowish brown (10YR 6/4; 2.5Y 6/4), light brown (7.5YR 6/4), and light olive brown (2.5Y 5/4). It is clay, silty clay or silty clay loam or their gravelly counterparts and is mildly alkaline or moderately alkaline and calcareous. Fragments
consisting of limestone concretions, and sea shells comprise 2 to 20 percent by volume of the horizon and are less than 3 inches in diameter.
COMPETING SERIES: These are the Behring, Denton, Durant, Harper, Krum, Miller, Normangee, Rioconcho, Roebuck, Steedman, Tabler, and Zaar series. Behring soils are noncalcareous to depth of 40 inches. Denton soils are calcareous throughout and have a calcic horizon. Durant and Tabler soils have argillic horizons. Harper soils have hard limestone within 20 inches. Krum, Miller, and Rioconcho soils lack bedrock within 72 inches. In addition, Miller and Rioconcho soils have mixed mineralogy. Normangee and Steedman soils have ochric epipedons. Roebuck and Zaar soils have a udic moisture regime and lack bedrock within 72 inches.
GEOGRAPHIC SETTING: These soils occur on very gently sloping uplands. Slopes range from 1 to 3 percent. Matoy soils formed in loamy and clayey residuum weathered from calcareous sedimentary rocks on uplands. Mean annual air temperature ranges from 62 degrees to 72 degrees F.; average annual precipitation ranges from 27 to 40 inches; Thornthwaite P-E index ranges from about 44 to 64.
GEOGRAPHICALLY ASSOCIATED SOILS: These are the competing Denton series, and the Burleson, Ferris, Heiden, San Saba, and Tarrant series. Burleson, Ferris, Heiden, and San Saba soils have intersecting slickensides between depths of 10 and 40 inches. Tarrant soils are underlain by limestone between depths of 6 and 20 inches and contain more than 35 percent limestone fragments throughout the solum.
DRAINAGE AND PERMEABILITY: Well drained; slow or medium runoff; slow permeability.
USE AND VEGETATION: Used mainly for pasture, cotton, soybeans, and small grains. Native vegetation is tall and mid grasses.
DISTRIBUTION AND EXTENT: Mainly on uplands in south central Oklahoma and central Texas. These soils are minor in extent.
MLRA SOIL SURVEY REGIONAL OFFICE (MO) RESPONSIBLE: Temple, Texas
SERIES ESTABLISHED: Bryan County, Oklahoma; 1975.
REMARKS: These soils were formerly classified as Rendzinas, Grumusols, and as Grumusol-Brunizem intergrade and were included in the Denton series.