LOCATION EMACHAYA OKEstablished Series
TAXONOMIC CLASS: Fine, mixed, active, nonacid, thermic Alfic Udarents
TYPICAL PEDON: Emachaya silt loam, 2 percent slope, pasture land. (Colors are for moist soil unless otherwise stated.)
Ad--0 to 6 inches; brown (10YR 5/3) silt loam; massive and platy structure; hard, friable; slightly acid; clear smooth boundary. (1 to 16 inches thick)
Cd1--6 to 15 inches; dark brown (10YR 4/3) gravelly clay loam; massive structure; extremely hard, very firm; 10 percent fragments of shale less than 76mm across; medium acid; gradual smooth boundary. (4 to 65 inches thick)
Cd2--15 to 79 inches; strong brown (7.5YR 5/6) gravelly clay loam; massive structure; extremely hard, very firm; 15 percent fragments of shale less than 76mm across; common medium distinct light brownish gray mottles; mildly alkaline; abrupt smooth boundary. (12 to 65 inches thick)
Cr--79 to 80 inches; dark gray (2.5Y 4/0) shale; churned and hard.
TYPE LOCATION: Haskell County, Oklahoma; 2500 feet east and 600 feet south of the northwest corner of Sec. 10, T.8N., R.21E.
RANGE IN CHARACTERISTICS: Solum thickness and depth to unconsolidated bedrock is greater than 60 inches. Fragments of shale and sandstone range from 0 to 35 percent throughout the profile.
The Ad horizon has hue of 5YR, 7.5YR and 10YR, value of 3, 4 or 5 and chroma of 2 through 6. Texture of the fine earth fraction is fine sandy loam, silt loam, loam, very fine sandy loam or silty clay loam. Reaction ranges from strongly acid to mildly alkaline.
The Cd horizon has hue of 5YR, 7.5YR and 10YR, value of 4 or 5 and chroma of 1 through 6. Texture of the fine earth fraction is silty clay loam or clay loam. Stratas of silt loam or fine sandy loam occur in some pedons. It is mottled in shades of red, brown or gray. Some pedons have C horizons that are not compacted within the profile.
The Cr horizon has hue of 2.5Y, value of 4 and chroma of 0. It is shale.
COMPETING SERIES: These include the tentative Lequire and Whitefield series and the tentative Blocker, Cartersville, Latimer, Coalgate and Ironbridge soils in closely similar families and the Kanima series. Lequire and Blocker soils are less then 20 inches deep over shale material. Cartersville soils are less clayey and less than 20 inches deep over shale. Whitefield soils are less than 40 inches deep over shale. Kanima soils have more coarse fragments throughout the profile. Latimer, Coalgate and Ironbridge soils have natric horizons.
GEOGRAPHIC SETTING: Hoyt soils are on nearly level to gently sloping areas of strip mines in the Arkansas Ridges and Valley land resource area. These soils are formed from the premine soils of the Stigler, Tamaha, and Counts series. The average annual temperature ranges from 54 to 57 degrees F., and the average annual precipitation ranges from 42 to 45 inches.
GEOGRAPHICALLY ASSOCIATED SOILS: These include the competing tentative series Blocker, Cartersville, Whitefield, Ironbridge, Coalgate and Kanima series. Blocker soils are on steeper cutslope areas. Lequire soils are on similar areas and have less than 20 inches of reclaim material over the shale. Cartersville soils are on steeper areas and are less clayey than Hoyt soils. Coalgate and Ironbridge soils are on similar areas but have Natric horizons. Whitefield soils are less than 40 inches deep over shale.
DRAINAGE AND PERMEABILITY: Well drained. Runoff is slow to moderate. Permeability is very slow.
USE AND VEGETATION: Used mainly for pasture land. Vegetation is bermuda grass, love grass, or plains bluestem.
DISTRIBUTION AND EXTENT: Oklahoma and Arkansas. The series is not extensive with less than 5000 acres.
MLRA SOIL SURVEY REGIONAL OFFICE (MO) RESPONSIBLE: Temple, Texas
SERIES ESTABLISHED: Haskell County, Oklahoma, 1989.