LOCATION GUYTON LA+AR MS OK TN TXEstablished Series
TAXONOMIC CLASS: Fine-silty, siliceous, active, thermic Typic Glossaqualfs
TYPICAL PEDON: Guyton silt loam on a local stream alluvial plain. Less than 0.5 percent slope in hardwood woodland. (Colors are for moist soil unless otherwise stated.)
A--0 to 6 inches; grayish brown (10YR 5/2) silt loam; common medium distinct dark yellowish brown (10YR 4/4) mottles; weak medium subangular blocky structure; friable; strongly acid; clear smooth boundary. (0 to 8 inches thick)
Eg1--6 to 11 inches; light brownish gray (10YR 6/2) silt loam; common medium distinct dark yellowish brown (10YR 4/4) mottles; weak medium subangular blocky structure; friable; few fine soft brown bodies; strongly acid; clear wavy boundary.
Eg2--11 to 23 inches; light brownish gray (2.5Y 6/2) silt loam; common medium distinct dark yellowish brown (10YR 3/4) and dark brown (10YR 4/3) mottles; weak medium subangular blocky structure; compact and brittle; many fine pores which have dark gray stains; tongues about 3 inches wide extend to 35 inches below the surface; very strongly acid; clear irregular boundary. (Combined thickness of Eg horizons is 11 to 27 inches)
B/E--23 to 35 inches; gray (10YR 5/1) silty clay loam; common medium prominent strong brown (7.5YR 5/6) mottles; weak coarse blocky structure; friable; few distinct clay films on faces of peds and in pores; the strong brown areas are slightly brittle; tongues of light brownish gray (10YR 6/2) silt loam (E) make up about 15 percent of the horizon; very strongly acid; clear wavy boundary. (8 to 24 inches thick)
Btg1--35 to 46 inches; grayish brown (10YR 5/2) silt loam; common medium prominent strong brown (7.5YR 5/6) mottles; weak coarse and medium subangular blocky structure; slightly compact; friable; few distinct clay films on faces of peds; very strongly acid; clear smooth boundary.
Btg2--46 to 70 inches; gray (10YR 6/1) clay loam surrounding pockets of brittle strong brown (7.5YR 5/6) clay loam; weak coarse subangular blocky structure; firm; few faint clay films on horizontal faces of peds and few to many distinct clay films on vertical faces of peds; few fine brown concretions; few pockets of clay loam and sandy clay which tend to be vertically oriented; very strongly acid; abrupt smooth boundary. (Combined thickness of the Btg horizons is 15 to 45 inches)
Cg--70 to 80 inches; light olive gray (5Y 6/2) sandy clay loam; common medium prominent strong brown (7.5YR 5/6) mottles; massive; firm; hard and compact; very strongly acid.
TYPE LOCATION: Ouachita Parish, Louisiana; about 16 miles southwest of West Monroe, one mile north of Louisiana Highway 35 junction with Louisiana Highway 146. SE1/4NW1/4 sec. 28, T. 17 N., R. 1 E., 2,540 feet south and 2,590 feet east of northwest section corner, 72 feet east of pipeline.
RANGE IN CHARACTERISTICS: Solum thickness ranges from 50 to about 80 inches. Sand content which is dominantly very fine sand ranges from 10 to 40 percent in the control section. Exchangeable sodium ranges from less than 5 percent to 40 percent in the lower part of the solum.
The A or Ap horizon has hue of 10YR or 2.5Y, value of 3 to 6, and chroma 2 or 3. Horizons with value of 3 are less than 6 inches thick. Texture is silt loam, loam, or very fine sandy loam. Reaction ranges from extremely acid to medium acid.
The Eg horizon has hue of 10YR or 2.5Y, value 5 to 8, and chroma 1 or 2. Mottles in shades of brown range from few to many. The Eg horizon is silt loam, loam, or very fine sandy loam. Reaction ranges from extremely acid to medium acid. The lower boundary of the Eg horizon is clear irregular or abrupt irregular and tongues extend into the Btg horizon.
Some pedons have an E/B horizon, 6 to 15 inches thick. Most pedons have a thick B/E horizon. The Bt and E parts of the E/B and B/E horizons have the same range in color, texture, and reaction as the Btg and Eg horizons, respectively.
The Btg horizon has hue of 10YR or 2.5Y, value 5 or 6, and chroma of 1 or 2. Mottles in shades of brown or gray range from few to many. Texture is silt loam, silty clay loam, or clay loam. Reaction ranges from extremely acid to medium acid.
The BC and Cg horizons have the same color range as the Btg horizon. Texture is silt loam, silty clay loam, clay loam, or sandy clay loam. Reaction of the BC horizon ranges from extremely acid to medium acid. Reaction of the Cg horizon ranges from strongly acid to moderately alkaline.
COMPETING SERIES: These are the Alikchi, Caddo, and Kinder series in the same family and the Amy, Basile, Bonn, Calhoun, Foley, Fountain, Frost, Henry, Mashulaville, Myatt, and Zachary series. Alikchi soils have bedrock within 40 inches of the surface. Amy, Henry, Mashulaville, Myatt, and Zachary soils do not have an E horizon that tongues into the Bt horizon. Also, Henry and Mashulaville soils have a fragipan and Henry soils contain less than 10 percent sand. Basile soils have mixed mineralogy and subhorizons that contain carbonate concretions. Bonn and Foley soils have natric horizons and are neutral to alkaline in the Bt horizon. Caddo soils have prominent red mottles and a few plinthite nodules in the Bt horizons. Calhoun and Fountain soils have less than 15 percent sand and have calcium to magnesium ratios greater than 1. Frost soils have prominent dark gray to black clay films in the Bt horizon and have mixed mineralogy. Kinder soils have prominent red mottles in the Bt horizon.
GEOGRAPHIC SETTING: Guyton soils are on flood plains of streams draining silty Pleistocene terraces and parts of the Coastal Plains. They also are on broad nearly level and depressional areas on flat silty terraces. Slopes range form 0 to 1 percent. The soils formed in alluvium with a high silt content. The climate is warm and humid. Mean annual temperature ranges from 60 to 70 degrees F. Average annual rainfall ranges from 42 to 62 inches.
GEOGRAPHICALLY ASSOCIATED SOILS: These are the Caddo, Frizzell, Lucy, Ora, Providence, Rosebloom, Ruston, Savannah, and Wrightsville series. Lucy, Ora, Providence, Rosebloom, Ruston, and Savannah soils do not have an E horzon that tongues into the Bt horizon. Caddo soils are on slightly higher landscapes. Frizzell soils have more than 15 percent sand coarser than very fine sand and chroma of 3 or more. Lucy and Ruston soils have redder hues. Providence, Ora, and Savannah soils have a fragipan and are better drained. Rosebloom soils do not have an argillic horizon. Wrightsville soils are in similar terrace positions and have a fine-textured argillic horizon.
DRAINAGE AND PERMEABILITY: Guyton soils are poorly drained, except where ponded. Where runoff is ponded, drainage is very poor. Runoff is slow to ponded. Permeability is slow. A seasonal high water table is at 0 to 1.5 feet below the surface from December through May, except where ponded. Where ponded, it is from 1 foot above the surface to 0.5 foot below the surface most of the time. In places, the soils are subject to rare, occasional, or frequent flooding.
USE AND VEGETATION: Most areas are in woodland. Water oak, baldcypress, water tupelo, loblolly pine, and shortleaf pine are dominant in the drainageways. On broad terraces, baldcypress and water tupelo generally are absent and sweetgum dominates. Some areas are used as pastureland or cropland.
DISTRIBUTION AND EXTENT: Arkansas, Louisiana, Mississippi, Oklahoma, and possibly Texas. The series is extensive.
MLRA OFFICE RESPONSIBLE: Little Rock, Arkansas
SERIES ESTABLISHED: Ouachita Parish, Louisiana; 1969.
REMARKS: Diagnostic horizons and other features recognized are:
Ochric epipedon..............................0 to 23 inches (A,Eg)
Albic horizon.............................6 to 23 inches (Eg1,Eg2)
Tonguing of E horizon into the Btg horizon...23 to 35 inches (B/E)
Argillic horizon...................23 to 70 inches (B/E,Btg1,Btg2)
Aquic moisture regime
ADDITIONAL DATA: NSSL Sample Nos. S68LA-073-004 & S87LA-085-004