LOCATION DALLARDSVILLE      TX

DALLARDSVILLE SERIES

TAXONOMIC CLASS: Coarse-loamy, siliceous, semiactive, thermic Oxyaquic Paleudults

TYPICAL PEDON: Dallardsville very fine sandy loam--forest in area of Waller-Dallardsville complex.
(Colors are for moist soil unless otherwise stated.)

A--0 to 7 inches; yellowish brown (10YR 5/4) very fine sandy loam; weak medium subangular blocky structure; slightly hard, very friable; many very fine to coarse roots; many fine pores and medium pores; common masses of grayish brown (10YR 5/2) very fine sandy loam; few worm casts; 2 percent fine and medium rounded ironstone nodules; extremely acid; clear smooth boundary. (3 to 10 inches thick)

E--7 to 21 inches; pink (7.5YR 7/3) very fine sandy loam; weak coarse subangular blocky structure; slightly hard, very friable; many very fine to coarse; many fine and medium pores; few worm casts; 2 percent fine rounded ironstone nodules; 4 percent fine distinct reddish yellow (7.5YR 6/8) iron concentrations with sharp boundaries; extremely acid; clear smooth boundary. (11 to 20 inches thick)

E/Btl--21 to 31 inches; 65 percent pink (7.5YR 7/3) very fine sandy loam (E); 35 percent reddish yellow (7.5YR 6/8) (Bt); weak coarse prismatic structure parting to weak medium subangular blocky; hard, friable; many very fine, fine and common medium roots; many fine and medium pores; few faint reddish yellow (7.5YR 6/6) clay films on surfaces of peds and in pores in Bt part; few worm casts; 2 percent fine rounded ironstone nodules; 3 percent fine and medium distinct reddish yellow (7.5YR 6/6) and 2 percent fine prominent brownish yellow (10YR 6/8) iron concentrations with sharp boundaries between peds; extremely acid; clear irregular boundary.

E/Bt2--31 to 38 inches; 55 percent pink (7.5YR 7/3), very fine sandy loam; 45 percent reddish yellow (7.5YR 6/6) (Bt); weak medium prismatic structure parting to weak fine and medium angular blocky; hard, friable; common very fine roots between peds; many fine and medium pores; few faint reddish yellow (7.5YR 6/8) clay films on surfaces of peds and in pores in Bt part; 4 percent fine rounded ironstone nodules; 7 percent fine and medium prominent reddish yellow (7.5YR 6/8) and reddish yellow (5YR 6/8) iron concentrations with clear boundaries between peds in Bt part; 1 percent fine distinct light gray (10YR 7/2) iron depletions in the E part; extremely acid; clear smooth boundary. (Combined thickness of the E/Bt subhorizons is 9 to 21 inches thick)

Bt/E--38 to 47 inches; 70 percent light yellowish brown (10YR 6/4), very fine sandy loam (Bt); 30 percent pink (7.5YR 7/3) (E); weak medium prismatic structure parting to weak fine and medium angular blocky; hard, firm; common very fine and fine roots between peds; common fine and medium pores; few distinct brownish yellow (10YR 6/6) clay films on surfaces of peds and in pores; 3 percent fine rounded ironstone nodules; 3 percent medium prominent red (2.5YR 4/8) iron concentrations with sharp boundaries; 4 percent fine and medium prominent yellowish red (5YR 5/8) iron concentrations with clear boundaries on surfaces of peds and in pores; 7 percent fine and medium distinct yellow (10YR 7/8) iron concentrations with diffuse boundaries on surfaces of peds in Bt part; 1 percent fine faint light gray (10YR 7/2) clay depletions in the E part; 20 percent slightly brittle material 1 to 3 inches wide; very strongly acid; gradual wavy boundary. (5 to 17 inches thick)

Bt/Eg--47 to 61 inches; 85 percent brownish yellow (10YR 6/6) very fine sandy loam (Bt); 15 percent light gray (10YR 7/1) (Eg); weak coarse prismatic structure parting to moderate fine and medium angular blocky; very hard, very firm; common very fine roots between peds; many fine and medium and common coarse pores; few distinct reddish yellow (7.5YR 6/6) clay films on surfaces of peds and in pores; 2 percent fine red (2.5YR 4/8) plinthite; 5 percent medium prominent red (2.5YR 4/8) iron concentrations with abrupt boundaries on surfaces of peds; 3 percent medium prominent reddish yellow (5YR 6/8) iron concentrations with clear boundaries on surfaces of peds and in pores; 2 percent fine faint yellow (2.5Y 7/6) iron concentrations with diffuse boundaries on surfaces of peds in Bt part; the E portion of this horizon consists of albic material that is 1/8 to 1/2 inch wide on surfaces of prisms and is a clay depletion resulting from aquic conditions; 35 percent is brittle material 1 to 5 inches wide; very strongly acid; gradual wavy boundary. (Combined thickness of the Bt/E subhorizons is 17 to 35 inches thick)

Btx/Egl--61 to 75 inches; 80 percent brownish yellow (10YR 6/6) very fine sandy loam (Btx); 20 percent light gray (10YR 7/1) (Eg); moderate coarse prismatic structure parting to moderate medium and coarse angular blocky; very hard, very firm; common very fine roots in nonbrittle material; many fine and medium and common coarse pores; few distinct reddish yellow (7.5YR 6/6) clay films on surfaces of peds and in pores; 3 percent fine red (2.5YR 4/8) plinthite; 2 percent fine prominent red (2.5YR 4/6) iron concentrations with abrupt boundaries; 8 percent medium prominent strong brown (7.5YR 5/8) iron concentrations with clear boundaries; 2 percent fine faint brownish yellow (10YR 6/8) iron concentrations with diffuse boundaries on surfaces of peds; the Eg portion of this horizon consists of albic material 1/8 to 2 inches wide on surface of prisms and is a clay depletion resulting from aquic conditions; 60 percent is brittle; very strongly acid; gradual wavy boundary.

Btx/Eg2--75 to 80 inches; 70 percent reddish yellow (7.5YR 6/8) very fine sandy loam (Btx); 30 percent light gray (10YR 7/1) (Eg); moderate very coarse prismatic structure parting to moderate coarse angular blocky; very hard, very firm; many fine to coarse pores; few distinct brownish yellow (10YR 6/8) clay films on surfaces of peds; 5 percent medium prominent yellowish red (5YR 5/8) iron concentrations on surfaces of peds; the E portion of this horizon consists of albic material 1/16 to 1 inch wide on surfaces of prisms with 5 percent fine faint very pale brown (10YR 8/2) and few fine prominent bluish gray (5B 6/1) iron depletions with clear boundaries in interior of E part; the E is a clay depletion resulting from aquic conditions; 65 percent of the horizon is brittle to very brittle; very strongly acid. (Combined thickness of the Btx/E subhorizons is 15 to 30 inches thick)

TYPE LOCATION: Hardin County, Texas; from the intersection of Texas Farm Road 92 and Texas Farm Road 1122 in Silsbee; 4.3 miles north on Texas Farm Road 92 to Gore Store Road; 2.75 west on Gore Store Road to county road; 0.85 mile north on county road, and 0.5 mile east on county road to forest road; 0.3 mile south and 0.7 mile east on forest road; 300 feet northwest on pipeline; 250 feet west of pipeline in forest. (Latitude 30N, 29, 05; Longitude 94W, 12, 31)

RANGE IN CHARACTERISTICS: Solum thickness is more than 80 inches. Reaction ranges from extremely acid to strongly acid throughout.

Soil Moisture: The soil moisture control section is 8 to 24 inches.
Mean annual soil temperature: 69 to 72 degrees F.
Depth to argillic horizon: 27 to 38 inches.
Udic moisture regime.
Depth to glossic horizon: 24 to 36 inches.
Depth to redox concentrations: 9 to 18 inches.
Depth to redox depletions: 18 to 34 inches.
Depth to fragipan: 50 to 65 inches.

Particle-size control section (weighted average)
Clay content: 10 to 18 percent.
Base saturation: 15 to 25 percent.
CEC to clay ratio: 0.30 to 0.40.

A horizon
Hue: 10YR
Value: 3 to 5
Chroma: 2 to 4
Texture: very fine sandy loam, fine sandy loam, silt loam

E horizon
Hue: 7.5YR or 10YR
Value: 5 to 7
Chroma: 3 or 4
Texture: very fine sandy loam, fine sandy loam, silt loam
Iron concentrations: amount-0 to 8 percent, color-brown or yellow, boundary-sharp to diffuse.

E/Bt horizon
Part: E
Hue: 7.5YR or 10YR
Value: 6 or 7
Chroma: 3 or 4
Part: Bt
Hue: 7.5YR or 10YR
Value: 6 or 8
Texture: very fine sandy loam, fine sandy loam, silt loam
Iron concentrations: amount-5 to 25 percent; color-brown or yellow; boundary-sharp to diffuse and are mostly in the Bt part.
Iron depletions: amount-0 to 2 percent; color-gray; boundary-clear and are mostly in the E part.

Bt/E horizon
Part: Bt
Hue: 7.5YR or 10YR
Value: 5 to 7
Chroma: 6 to 8
Part: E
Hue: 7.5YR or 10YR
Value: 7 or 8
Chroma: 3
Texture: very fine sandy loam, fine sandy loam, silt loam, loam
Iron concentrations: amount-5 to 25 percent; color-brown, red, or yellow; boundary-sharp to diffuse and are mostly in the Bt part.
Iron depletions: amount-0 to 2 percent; color-gray, green, or gray; boundary-clear and are mostly in the E part.
Plinthite: 0 to 3 percent
Brittle material: 20 to 45 percent

Bt/Eg horizon
Part: Bt
Hue: 7.5YR or 10YR
Value: 5 to 7
Chroma: 4 to 8
Part: Eg
Hue: 7.5YR or 10YR
Value: 7 or 8
Chroma: 1 or 2
Texture: very fine sandy loam, fine sandy loam, loam
Iron concentrations: amount-10 to 25 percent; color-brown, red, or yellow; boundary-sharp to diffuse and are mostly in the Bt part.
Iron depletions: amount-1 to 5 percent; color-blue, green, or gray; boundary-clear and are mostly in the E part.
Plinthite: 0 to 3 percent
Brittle material: 20 to 45 percent

Btx/Eg horizon
Part: Bt
Hue: 7.5YR or 10YR
Value: 5 to 7
Chroma: 4 to 8
Part: Eg
Hue: 7.5YR or 10YR
Value: 7 or 8
Chroma: 1 or 2
Texture: very fine sandy loam, fine sandy loam, loam, or silt loam
Iron concentrations: amount-10 to 25 percent; color-brown, red, or yellow; boundary-sharp to diffuse and are mostly in the Bt part.
Iron depletions: amount-1 to 5 percent; color-blue, green, or gray; boundary-clear and are mostly in the E part.
Plinthite: 0 to 3 percent
Brittle material: 60 to 85 percent

COMPETING SERIES: This is the Kountze series. Similar soils are Brogdon, Compass, Perdido, and Poarch series.
Kountze soils: do not have a fragipan; has Btv/Eg horizons
Brogdon and Compass soils: sandy surface layer; Brogdon soils have a bisequal pedon. Compass soils have a lithologic discontinuity.
Perdido soils: subactive CEC class; do not have a glossic horizon.
Poarch soils: a semiactive CEC class; do not have a glossic horizon.

GEOGRAPHIC SETTING:
Parent material: Loamy sediments derived from the Lissie Formation of early to mid-Pleistocene age.
Landform: coastal plains on oblong mounds 2 to 5 feet higher than the surrounding inter-mound; mounds are 30 to 100 feet wide and 30 to 400 feet long.
Slope: 0 to 1 percent
Mean annual air temperature: 67 to 69 degrees F.
Mean annual precipitation: 48 to 56 inches
Precipitation pattern: uniform throughout the year with slight peaks in the spring and summer
Frost-free period: 240 to 270 days
Elevation: 75 to 150 feet
Thornthwaite annual P-E indices: 68 to 80

GEOGRAPHICALLY ASSOCIATED SOILS: These are the Kirbyville, Otanya, Plank, Sorter, Splendora, and Waller series.
Kirbyville, Otanya, Splendora, and Waller soils: fine-loamy particle-size control section. Kirbyville, Otanya, and Splendora soils are on higher landscape positions. Waller soils are on a lower inter-mound landscape position.
Plank and Sorter soils: Vermaqualfs and are on lower landscape positions.

DRAINAGE AND PERMEABILITY: Moderately well drained. Permeability is slow. Runoff is moderately slow. A perched water table is at a depth of 3 to 4 feet from December to March.

USE AND VEGETATION: Used primarily for timber production and wildlife habitat. The main trees are loblolly pine, shortleaf pine, longleaf pine, water oak, willow oak, southern red oak, and sweetgum. Understory includes yaupon, southern bayberry, pinehill bluestem, longleaf uniola, and sedges.

DISTRIBUTION AND EXTENT: In the Western Gulf Coast Flatwoods (MLRA 152B) of southeast Texas and possibly Louisiana. The series is of moderate extent.

MLRA OFFICE RESPONSIBLE: Temple, Texas.

SERIES ESTABLISHED: Polk County, Texas; 1983.

REMARKS: The type location was moved from Polk County to Hardin County in 1997. The geographic setting was changed from a convex ridge to a mound to reflect the majority of the series province. The series classification was changed from Plinthic Paleudults to Oxyaquic Paleudults 10/1999.

Diagnostic horizons and features in this pedons are:
Ochric epipedon--0 to 7 inches (A horizon)
Argillic horizon--38 to 80 inches (Bt/E, Bt/Eg, and Btx/Eg horizons)
Fragipan--61 to 80 inches (Btx/Eg horizons)
Glossic horizon--21 to 80 inches (E/Bt, Bt/Eg, Btx/Eg. The glossic horizon is series criteria but not diagnostic for classification.)

ADDITIONAL DATA: Data from Texas A&M University Soil Characterization Lab on samples (S95TX-199-002 and S96TX-199-009). Soil moisture data from type location in Hardin County, Texas.

TAXONOMIC VERSION: Soil Taxonomy, Second Edition, 1999.