LOCATION DYLAN TXEstablished Series
TAXONOMIC CLASS: Very-fine, smectitic, hyperthermic Chromic Hapluderts
TYPICAL PEDON: Dylan clay, on convex 5 percent slopes in woodland, midway between microlow and microhigh. (Colors are for moist soil unless otherwise stated.)
A--0 to 4 inches; dark grayish brown (10YR 4/2) clay; few medium faint brown (10YR 5/3) mottles; moderate fine and medium subangular blocky structure; very hard, very firm, many fine and medium, and few coarse roots; many fine and very fine pores; many worm casts; few fine iron concretions; few small pieces of charcoal; decomposing pine and hardwood litter comprises approximately 20 percent of surface 1-inch; mildly alkaline; clear wavy boundary. (3 to 7 inches thick)
Bw--4 to 14 inches; brownish yellow (10YR 6/6) clay; few medium and coarse distinct grayish brown (10YR 5/2), common fine distinct reddish yellow (7.5YR 6/6), and common fine prominent red (2.5YR 5/8) mottles; moderate fine subangular blocky structure; extremely hard, extremely firm, very fine and medium, and few coarse roots; many fine and very fine pores; grayish brown (10YR 5/2) mottles associated with root channels; common dark brown root stains; dark grayish brown surface material fills vertical cracks; few small pressure faces; neutral; clear wavy boundary. (6 to 13 inches thick)
Bss--14 to 16 inches; yellowish brown (10YR 5/4) clay; few fine faint yellowish brown (10YR 5/6) mottles; moderate fine subangular blocky structure; extremely hard, extremely firm, common fine roots; many very fine pores; many dark brown root stains; many fine manganese concretions; common pressure faces; few intersecting slickensides; few vertical cracks filled with dark grayish brown surface material; mildly alkaline; clear wavy boundary. (2 to 6 inches thick)
Bkss1--16 to 26 inches; yellowish brown (10YR 5/6) clay; common fine faint strong brown (7.5YR 5/8) and common fine distinct light brownish gray (10YR 6/2) mottles; moderate medium and coarse subangular blocky structure; extremely hard, extremely firm, common fine and few coarse roots; common very fine pores; common pressure faces and intersecting slickensides; about 12 percent by volume fine pitted concretions of calcium carbonate; common fine black concretions; mildly alkaline; gradual wavy boundary. (8 to 14 inches thick)
Bkss2--26 to 38 inches; brownish yellow (10YR 6/6) clay; many fine faint strong brown (7.5YR 5/8) and common fine and medium distinct light brownish gray (10YR 6/2) mottles; weak coarse subangular blocky structure; extremely hard, extremely firm, few fine roots; common very fine pores; common pressure faces and intersecting slickensides; few dark brown root stains; common fine black concretions; pitted concretions and threads of calcium carbonate make up about 15 percent by volume; slightly calcareous matrix; moderately alkaline; clear wavy boundary. (10 to 14 inches thick)
Bkss3--38 to 52 inches; yellowish brown (10YR 5/6) clay; common coarse distinct light olive gray (5Y 6/2) mottles; many fine faint yellowish brown (10YR 5/8) mottles; moderate medium subangular blocky structure; extremely hard, extremely firm, few fine roots; common very fine pores; common dark brown root stains; many large intersecting slickensides; common fine manganese concretions; pitted concretions and threads of calcium carbonate make up about 5 percent by volume; calcareous; moderately alkaline; clear wavy boundary. (6 to 20 inches thick)
Bkss4--52 to 60 inches; strong brown (7.5YR 5/6) clay; few coarse distinct light brownish gray (10YR 6/2) and many fine and medium distinct light olive gray (5Y 6/2) mottles; strong fine angular and subangular blocky structure; extremely hard, extremely firm, few fine roots; few dark brown root stains; common large intersecting slickensides; few fine manganese concretions; about 3 percent by volume calcium carbonate as concretions and soft masses; moderately alkaline.
TYPE LOCATION: Liberty County, Texas; from the intersection of Texas Highway 321 and FM 1008 in Dayton; 6.3 miles west and north on FM 1008, then 0.9 mile west and north in Winter Valley Subdivision, then 0.1 mile north on Ski Run Rd.; site is 50 feet west in forest.
RANGE IN CHARACTERISTICS: Solum thickness ranges from 60 to more than 80 inches. Depth to horizons containing calcium carbonate ranges from 4 inches on microhighs to 33 inches on microlows. Depth to intersecting slickensides ranges from 10 to 32 inches. Undisturbed areas have a gilgai microrelief consisting of knolls 4 to 10 inches higher than the depressions, and with cycles repeating every 4 to 12 feet. The 10- to 40-inch control section contains 60 to 80 percent clay. Reaction ranges from neutral through moderately alkaline.
The A horizon has colors in shades of brown or gray, hue of 10YR or 2.5Y, value of 3 to 5, and chroma of 1 to 3. Colors with chroma of 2 or less in the subsoil are considered to be litho-chromic. Mottles with chroma of 3 or more, or redox concentrations, are considered to be relic or litho-chromic. Mottles in shades of brown and yellow range from none to common. When matrix values are less than 3.5, thickness of the A horizon is less than 12 inches thick. Texture is clay or clay loam.
The B horizons have colors in shades of brown and yellow hue of 7.5YR to 5Y, value of 4 to 7, and chroma of 2 to 8. Mottles range from few to many in shades of gray, brown, yellow, and olive. Reddish mottles range from few to many and occur in the upper B horizons, typically above the layers containing concretions or masses of calcium carbonate. Pitted concretions and threads or pockets of soft calcium carbonate range from 0 to 15 percent in the upper B horizons and from 3 to 20 percent in the lower B horizons. Some pedons have calcic horizons. Pressure faces and intersecting slickensides range from few to many, and generally increase with depth.
COMPETING SERIES: There are no series in the same family, and the Billyhaw, Brazoria, Morse, Naclina, Tahoula, Vamont, and Zilaboy series. Bayoudan soils are more acid and have By horizons. Burkeville soils are calcareous throughout and lack red mottles. Lacerda and Redco soils are more acid. In addition, Lacerda soils lack free carbonates within 60 inches. Lebeau soils have upper sola that are more acid, and have a grayer matrix. Billyhaw, Brazoria, Morse, and Tahoula soils lack grayish mottles due to wetness. Naclina, Vamont, and Zilaboy soils are in a fine family. In addition, Vamont soils lack carbonates.
GEOGRAPHIC SETTING: Dylan soils are on gently sloping to sloping uplands. The soils formed in clayey alluvium and are along stream terraces. The soil is forming mainly on the Beaumont geological formation. Slopes are dominantly 3 to 5 percent, but range from 1 to 8 percent. Mean annual precipitation from 46 to 56 inches and is fairly evenly distributed throughout the year. Warm season precipitation ranges from 30 to 60 inches. Mean annual temperature ranges from 67 to 70 degrees F., and the Thornthwaite annual P-E indices range from 70 to 80.
GEOGRAPHICALLY ASSOCIATED SOILS: These are the competing Vamont series and the Woodville series. Vamont soils are on smoother nearly level landscapes. Woodville soils have an argillic horizon and are on similar positions to Dylan.
DRAINAGE AND PERMEABILITY: Dylan soils are moderately well drained and are very slowly permeable. Runoff ranges from slow to rapid.
USE AND VEGETATION: Used mainly for woodland. Native vegetation consists of a sparse stand of loblolly and shortleaf pine, red oak, sweetgum, and Eastern red cedar. Understory vegetation consists of hawthorn, American beautyberry, and yaupon.
DISTRIBUTION AND EXTENT: Southeast Texas and Louisiana. The series is of minor extent.
MLRA OFFICE RESPONSIBLE: Temple, Texas
SERIES ESTABLISHED: Liberty County, Texas; 1986.
REMARKS: These soils were formerly included with the Naclina series. Formerly classified as Aquentic Chromuderts and were thermic. 1/94
Diagnostic features and horizons recognized in this pedon are:
Evidence of cracks to 16 inches; ochric epipedon; Cambic horizon; intersecting slickensides.