LOCATION SOCAGEE TX+LAEstablished Series
TAXONOMIC CLASS: Fine-silty, siliceous, active, acid, thermic Fluvaquentic Epiaquepts
TYPICAL PEDON: Socagee silty clay loam, on a smooth nearly level oak forested flood plain. (Colors are for moist soil unless otherwise stated.)
Ag--0 to 7 inches; gray (10YR 6/1) silty clay loam; many fine distinct dark yellowish brown (10YR 4/4) and common fine distinct dark yellowish brown (10YR 4/6) mottles; moderate medium subangular blocky structure; friable; many fine and common medium roots; few fine and medium pores; about 2 percent by volume silt and clean sand coatings on ped faces; about 4 percent by volume soft black masses 1 to 3 mm in diameter; very strongly acid; clear smooth boundary. (3 to 10 inches thick)
Bg1--7 to 21 inches; gray (10YR 6/1) silty clay loam; common fine distinct dark yellowish brown (10YR 4/6) mottles and common fine distinct yellowish brown (10YR 5/4) mottles; moderate medium subangular blocky structure; friable; common fine and common medium roots; common fine and medium pores; about 2 percent by volume silt and clean sand coatings on ped faces; few soft black masses 1 to 2 mm in diameter; very strongly acid; clear smooth boundary. (6 to 18 inches thick)
Bg2--21 to 40 inches; light gray (10YR 7/1) clay loam; few fine and medium distinct brownish yellow (10YR 6/8) mottles; moderate medium subangular blocky structure; friable; common fine and medium roots; few fine, medium, and coarse pores; about 4 percent by volume silt and clean sand coatings on ped faces; few soft black masses 1 to 7 mm in diameter; very strongly acid; clear smooth boundary. (8 to 48 inches thick)
Bg3--40 to 60 inches; grayish brown (10YR 5/2) clay loam; few fine distinct brownish yellow (10YR 6/8) and few fine distinct strong brown (7.5YR 5/6) mottles; weak medium subangular blocky structure; firm; few fine and medium roots; few fine and medium pores; about 2 percent by volume silt and clean sand coatings on ped faces; few black concretions 1 to 3 mm in diameter; few barite crystals; very strongly acid; gradual smooth boundary. (0 to 20 inches thick)
Bg4--60 to 70 inches; light brownish gray (10YR 6/2) clay loam; few medium distinct brownish yellow (10YR 6/8) and few fine distinct yellowish brown (10YR 5/8) mottles; weak medium subangular blocky structure; firm; few fine roots; few fine pores; 4 percent by volume silt and clean sand coatings on ped faces; few soft black masses 1 to 3 mm in diameter; few barite crystals; very strongly acid; clear smooth boundary. (0 to 18 inches thick)
BCg--70 to 80 inches; light brownish gray (10YR 6/2) loam; common medium distinct brownish yellow (10YR 6/8) and few medium distinct strong brown (7.5YR 5/6) mottles; weak coarse subangular blocky structure; friable; few fine roots; few soft black masses 1 to 3 mm in diameter; very strongly acid.
TYPE LOCATION: Harrison County, Texas; from the intersection of U.S. Highways 59 and 80 in Marshall, 16.6 miles east on U.S. Highway 80, 2.65 miles north on Texas Highway 9, 1.1 miles east on oil field road, and 150 feet south in woods. Longitude 94 degrees 2'40", Latitude 32 degrees 31'00".
RANGE IN CHARACTERISTICS:
Solum thickness: 60 to more than 80 inches
Clay content in the Control Section: 20 to 35 percent
Redoximorphic features: Iron concentrations in shades of brown, yellow, or red, and iron depletions in shades of gray are throughout the subsoil.
Other distinctive soil features: Clean sand and silt coatings comprise 0 to 4 percent by volume throughout the solum.
Concentrated minerals: Black concretions and soft masses range from 0 to 4 percent by volume throughout. Soft masses and concretions of barite range from none to few below a depth of 40 inches.
A horizon:
Color--Hue of 10YR, value of 4 to 6, and chroma of 1 to 3
Redoximorphic features--Iron concentrations range from none to many in shades of brown.
Texture--Silty clay loam, silt loam, loam, or clay loam
Other features--None
Reaction--Very strongly acid, unless limed
A2 horizon: (where present)
Color--Hue of 10YR, value of 4 to 6, and chroma of 2
Redoximorphic features--Iron concentrations range from few to common in shades of brown.
Texture--Ranges from loam to silty clay loam
Other features--None
Reaction--Very strongly acid, unless limed
Bg horizon:
Color--Hue of 10YR, value of 6 or 7, and chroma of 1 or 2 or value of 5 and chroma of 1. Some pedons have values of 5 and chroma of 2 below a depth of 40 inches.
Redoximorphic features--Iron concentrations in shades of brown, yellow, or red, and iron depletions in shades of gray range from few to many.
Texture--Silt loam, clay loam or silty clay loam. Some pedons have clay texture below a depth of 40 inches.
Other features--None
Reaction--Extremely acid to strongly acid in the particle-size control section; and very strongly acid to neutral below a depth of 40 inches.
BCg horizon:
Color--Hue of 10YR, value of 5 or 6, and chroma of 2 or 3.
Redoximorphic features--Iron concentrations in shades of brown, yellow, or red, and iron depletions in shades of gray range from few to many.
Texture--Loam, clay loam or silty clay loam
Other features--None
Reaction--Very strongly acid to neutral
COMPETING SERIES: There are no series in the same family. Closely related soils are the Dreka, Guyton, Mantachie, Mhoon, Nahatche, Pophers, Rosebloom and Wehadkee series. Dreka soils are nonacid. Guyton soils have an argillic horizon and have intrusions of albic materials into the argillic horizon. Mhoon, Rosebloom, and Wedhadkee soils have mixed mineralogy; also Mhoon, Nahatche, and Wedhadkee soils have a nonacid particle-size control section. Mantachie and Nahatche soils have a browner subsoil and are somewhat poorly drained. Pophers soils do not have a perched water table.
GEOGRAPHIC SETTING: Socagee soils are on nearly level flood plains. Slope gradients are less than 1 percent. The soils formed in loamy alluvium. Mean annual temperature is about 65 to 68 degrees F. The mean annual precipitation is about 44 to 54 inches, and the Thornthwaite P-E index ranges from 68 to 76.
GEOGRAPHICALLY ASSOCIATED SOILS: These are the closely related Guyton soils, and the Bonn, Cart, Iuka, Mathiston, and Sardis series. The Bonn, Cart and Guyton soils are on slightly higher terrace positions with mounded surfaces. Bonn soils have a natric horizon and Cart and Guyton soils have an argillic horizon. The Iuka and Mathiston soils are on floodplain positions slightly above the Socagee soils and commonly along smaller streams. Iuka soils have coarse-loamy particle-size control sections and Mathiston soils are members of the Aeric subgroup. The Sardis soils are on slightly higher natural levee positions along stream channels. Sardis soils have a brownish cambic horizon and are somewhat poorly drained.
DRAINAGE AND PERMEABILITY: Socagee soils are poorly drained. Permeability is moderately slow and rate of runoff is low. These soils are commonly flooded. The duration of flooding is from a few hours to a few days. Flooding is mainly from January through May. A perched water table is at the surface to 1.5 feet from the surface during most years from December through May. Some spots are ponded with 2 to 10 inches of water for 1 to 4 weeks after heavy rains.
USE AND VEGETATION: Used mainly for woodland a few areas are in pastureland. Native vegetation consists of willow oak, water oak, and overcup oak. Sedges, greenbriar, American holly, and longleaf uniola are part of the understory. Improved pastures consist mainly of bahiagrass.
DISTRIBUTION AND EXTENT: Eastern Texas and probably in Louisiana and Arkansas. The series is of minor extent.
MLRA SOIL SURVEY REGIONAL OFFICE (MO) RESPONSIBLE: Temple, Texas
SERIES ESTABLISHED: Harrison County, Texas 1986. The name is from a local creek.
REMARKS: These soils were formerly included in the Guyton series. This soil has organic carbon content of more than 0.2 percent at a depth of 1.25 metersand, illuviated clay was identified in thin sections in the particle-size control section. It also has mottling, structure, and manganese concretions and masses in the particle-size control section. The series was updated in 2004 to change the permeability class from moderate to moderately slow, as the interpretations for the series have always shown.
Diagnostic horizons and features recognized in the type location pedon include:
Ochric epipedon - 0 to 7 inches (A horizon).
Cambic horizon - 7 to 70 inches (Bg horizons)
Irregular organic carbon distribution - 50 inches (greater than 0.2% OC).
ADDITIONAL DATA: Harrison County, Texas; TAMU Characterization Lab Number S86TX-203-1, 2, 3; S88TX-203-2, 3, 4; Soils Mechanics Lab. Number 87TX-203-002.