LOCATION TABOR TX
Established Series
Rev. ELG-RM-JAW
08/2016
TABOR SERIES
The Tabor series consists of very deep, moderately well drained, very slowly permeable soils that formed in clayey and loamy alluvium derived from sandstone and shale. These nearly level to gently sloping soils are on stream terraces and terrace remnants along river valleys on Inland dissected coastal plains. The Slopes range from 0 to 5 percent. Mean annual precipitation is about 1092 mm (43 in) and the mean annual air temperature is about 19.4 degrees C (67 degrees F)
TAXONOMIC CLASS: Fine, smectitic, thermic Oxyaquic Vertic Paleustalfs
TYPICAL PEDON: Tabor fine sandy loam--pasture (Described between a subsoil crest and a subsoil trough. Colors are for moist soil unless otherwise stated.)
Ap--0 to 15 cm (0 to 6 in); brown (10YR 4/3) fine sandy loam, pale brown (10YR 6/3) dry; moderate medium and fine subangular blocky structure; hard, friable, sticky and plastic; many fine roots; 5 percent siliceous pebbles; common medium prominent strong brown (7.5YR 4/6) masses of iron accumulation; strongly acid; clear smooth boundary.
E--15 to 36 (6 to 14 in); brown (10YR 5/3) fine sandy loam, pale brown (10YR 6/3) dry; moderate medium and fine subangular blocky structure; hard, friable, sticky and plastic; many fine roots; 6 percent siliceous pebbles; common fine distinct dark yellowish brown (10YR 3/4) masses of iron accumulation; strongly acid, clear wavy boundary. (Combined thickness of the A and E horizons is 25 to 46 cm [10 to 18 in].)
Btss1--36 to 58 cm (14 to 23 in); brown (10YR 4/3) clay, brown (10YR 5/3) dry; moderate medium angular blocky structure; very hard, very firm, very sticky and very plastic; common fine roots; few fine pores; common distinct pressure faces; few distinct slickensides; common pale brown (10YR 6/3) coats on ped faces; few siliceous pebbles; common medium prominent dark red (2.5YR 3/6) and common coarse prominent yellowish brown (10YR 5/6) masses of iron accumulation; strongly acid; gradual wavy boundary.
Btss2--58 to 107 cm (23 to 42 in); grayish brown (10YR 5/2) clay, light brownish gray (10YR 6/2) dry; weak coarse angular blocky structure; very hard, very firm; few fine roots; common distinct slickensides; many distinct pressure faces; few dark grayish brown (10YR 4/2) clay films on vertical surfaces of peds; 2 percent siliceous pebbles; many coarse prominent yellowish brown (10YR 5/6) and few fine prominent dark red (2.5YR 3/6) masses of iron accumulation; moderately acid; clear smooth boundary.
Btss3--107 to 145 cm ( 42 to 57 in); yellowish brown (10YR 5/6) clay loam, brownish yellow (10YR 6/6) dry; weak coarse prismatic structure parting to moderate medium angular blocky; very hard, very firm, sticky and plastic; few fine roots; few fine pores; many continuous very dark grayish brown (10YR 3/2) clay films on ped surfaces and in pores; few distinct slickensides; common distinct pressure faces; few siliceous pebbles; common medium distinct strong brown (7.5YR 4/6) and few fine grayish brown (10YR 5/2) iron depletions; neutral; gradual smooth boundary. (Combined thickness of the Bt horizons is 76 to 127 cm [30 to 50 in].)
Btg--145 to 170 cm (57 to 67 in); light brownish gray (10YR 6/2) sandy clay loam, light gray (10YR 7/2) dry; weak coarse prismatic structure parting to weak medium angular blocky; very hard, very firm, sticky and plastic; few fine roots; few fine pores; few calcium carbonate concretions; common continuous very dark grayish brown (10YR 3/2) clay films on vertical surfaces of peds; 2 percent siliceous pebbles; many medium prominent yellowish brown (10YR 5/6) and common medium distinct red (2.5YR 4/6)) masses if iron accumulation; neutral; gradual smooth boundary. (0 to 51 cm [0 to 20 in].)
BCtg1--170 to 183 cm (67 to 72 in); light gray (10YR 7/2) sandy clay loam, very pale brown (10YR 8/2) dry; weak coarse angular blocky structure; hard, firm, sticky and plastic; few fine roots; few fine pores; few patchy very dark grayish brown (10YR 3/2) clay films; few distinct brown (10YR 4/3) sand coats along surfaces of peds; few distinct grayish brown (10YR 5/2) clay films on vertical surfaces of peds; 8 percent siliceous pebbles; common coarse prominent dark yellowish brown (10YR 4/6) and common medium prominent brownish yellow (10YR 6/6) masses of iron accumulation; neutral; gradual smooth boundary.
BCtg2--183 to 203 (72 to 80 in); light gray (10YR 7/1) sandy clay loam, white (10YR 8/1) dry; weak coarse angular blocky structure; hard, friable, sticky and plastic; few fine roots; few fine pores; few patchy dark grayish brown (10YR 4/2) clay films on vertical ped faces; thick continuous prominent light yellowish brown (10YR 6/4) coats on vertical surfaces of peds; few siliceous pebbles; many coarse prominent yellowish red (5YR 5/8) and common medium prominent red (10R 4/6) masses of iron accumulation; neutral; gradual smooth boundary. (Combined thickness of the BC horizons is 0 to 76 cm [0 to 30 in].)
TYPE LOCATION: Brazos County, Texas; From the intersection of Texas 21 and Texas Highway 6 (east bypass) in Bryan, Texas, 8.5 miles northeast on Texas Highway 21 to Kurten, Texas; 2.9 miles east and north on Democrat Road; 0.7 mile east on semiprivate road; 200 feet south in pasture. USGS Clear Lake topographic quadrangle; Latitude: 30 degrees, 48 minutes, 2.08 seconds N; Longitude: 96 degrees, 12 minutes, 23.51 seconds W. Datum: WGS84.
RANGE IN CHARACTERISTICS:
Soil Moisture: An ustic soil moisture regime. The soil moisture control section is dry in some or all parts for more than 90 days but less than 150 cumulative days in normal years.
Soil depth: 152 to more than 203 cm (60 to more than 80 in).
Depth of abrupt texture change: 20 to 58 cm (8 to 23 in).
Depth of albic materials: 10 to 27 cm (4 to 11 in)
Depth to argillic horizon: 20 to 58 cm (8 to 23 in)
Depth to secondary calcium carbonate (when present): 107 to 147 cm (42 to 58 in)
Depth to redox concentration: 0 to 203 cm (0 to 80 in)
Depth to redox depletions: 38 to 107 cm (15 to 42 in)
Vertic features: 23 to 147 cm (9 to 58 in)
Thickness of Ochric epipedon: 25 to 46 cm (10 to 18 in)
Particle-size control section (weighted average)
Clay content: 45 to 55 percent
Rock Fragments: 0 to 65 percent
COLE ranges from .07 to .12 in the upper 51 cm (20 in) of the argillic horizon.
Base saturation is 75 to 90 percent in some part of the Bt horizon.
Masses of iron accumulation and iron depletions are considered to be both contemporary and relict redoximorphic features.
A horizon:
Hue: 10YR or 7.5YR
Value: 4 to 7
Chroma: 2 or 3
Texture: fine sandy loam
Redox concentrations: 0 to 10 percent, fine to medium, faint to prominent, diffuse to clear
Rock fragments: amount-0 to 65 percent, size-2 to 25 mm, kind-quartziteReaction: strongly acid to slightly acid
E horizon:
Hue: 10YR or 7.5YR
Value: 5 to 8
Chroma: 3 or 5
Texture: fine sandy loam
Redox concentrations: 0 to 5 percent, fine, faint to distinct, diffuse to clear
Iron-manganese concentrations: 0 to 1 percent, fine, concretions
Rock fragments: amount-0 to 65 percent, size-2 to 5 mm, kind-quartziteReaction: strongly acid to slightly acid
Other features: The boundary between the E and Bt horizon is abrupt over the subsoil crests and clear in subsoil troughs
BE horizon (where present):
Hue: 10YR
Value: 7
Chroma: 3
Texture: fine sandy loam, or sandy clay loam.
Redox concentrations: 0 to 5 percent, fine, faint to distinct, diffuse to clear
When present the horizon is thickest in subsoil troughs and absent or thinnest on subsoil crests
Reaction: strongly acid to slightly acid
Other features: horizon thickness is 3 to 18 cm (1 to 7 in) thick but typically less than 8 cm (3 in) thick, is present in some pedons
Btss or Bt horizons:
Hue: 10YR or 2.5Y
Value: 4 to 7
Chroma: 2 to 6
Texture: clay, or clay loam.
Slickensides/Pressure faces: 0 to 40 percent, faint to distinct
Redox concentrations: 0 to 25 percent, fine to coarse, distinct to prominent, diffuse to clear
Redox depletions: 0 to 1 percent, fine, diffuse to clear
Iron-manganese concentrations: 0 to 5 percent, fine to medium, concretions
Rock fragments: amount-0 to 2 percent, size-2 to 5 mm, kind-quartzite
Reaction: very strongly acid or strongly acidranges to neutral in the lower Btss horizons.
Btg horizons:
Hue: 10YR
Value: 5 to 7
Chroma: 1 or 2
Texture: sandy clay loam, clay loam, or clay
Pressure faces: 0 to 10 percent
Redox concentrations: 0 to 30 percent, fine to coarse, distinct to prominent, diffuse to clear
Iron-manganese concentrations: 0 to 10 percent, fine to medium, concretions
Rock fragments: amount-0 to 2 percent, size-2 to 5 mm, kind-quartzite
Reaction: strongly acid to neutral
BCtg or BCtgy horizon:
Hue: 10YR, 2.5Y, or 2.5YR
Value: 4 to 8
Chroma: 1 to 8
Texture: sandy clay loam, loam or clay loam
Pressure faces: 0 to 1 percent
Redox concentrations: 0 to 30 percent, fine to coarse, faint to prominent, diffuse to clear
Iron-manganese concentrations: 0 to 10 percent, fine, concretions or masses
Rock fragments: amount-0 to 8 percent, size-2 to 5 mm, kind-quartzite
Identifiable secondary carbonate: 0 to 1 percent, fine to medium, carbonate concretions
Gypsum: 0 to 2 percent (where present)
Reaction: moderately acid to slightly alkaline
C or Cy horizon (where present):
Hue: 10YR, 2.5Y, or 5YR
Value: 5 to 7
Chroma: 0, 2, 6 or 8
Texture: sandy clay loam, clay loam, or clay and typically contains thin strata of shale or weakly consolidated sandstone.
Redox concentrations: 0 to 30 percent, fine to coarse, faint to prominent
Iron-manganese concentrations: 0 to 2 percent, fine, concretions
Rock fragments: amount-0 to 2 percent, size-2 to 5 mm, kind-shale
Identifiable secondary carbonate: 0 to 1 percent, fine to medium, carbonate concretions
Gypsum: 0 to 2 percent
Reaction: medium acid to moderately alkaline
COMPETING SERIES: These are the
Lufkin and
Mabank series in the same family. Similar soils are the
Axtell,
Bremond,
Chazos,
Crockett,
Crosstell,
Kurten,
Navo,
Rader,
Straber and
Zulch soils.
Lufkin soils: have dominant chroma of 2 or less.
Mabank,
Axtell,
Bremond,
Crockett,
Crosstell,
Kurten,
Navo, and
Zulch series: have epipedons less than 25 cm (10 in) thick in more than 50 percent of the pedon. In addition, Axtell, Crosstell, and Kurten soils typically have redder hue in the Bt1 horizon.
Bremond and
Crockett soils: are moderately acid to neutral in the upper Bt horizon.
Crosstell,
Crockett, and
Kurten soils: have solum 102 to 152 cm (40 to 60 in) thick over geologic materials.
Chazos and
Straber soils: have mixed mineralogy and a loamy fine sand surface layer.
Navo soils: do not have an abrupt texture change between the A to Bt horizon.
Zulch soils: have sola from 76 to 102 cm (30 to 40 in) thick.
Rader soils: have a fine-loamy particle-size control section.
GEOGRAPHIC SETTING:
Parent material: clayey and loamy alluvium derived from sandstone or shale
Landscape: inland dissected coastal plains, river valleys
Landform: convex linear treads on stream terraces, typically 15.2 to 76 m (50 to 250 ft) above present streams
Slope: 0 to 5 percent, mainly less than 3 percent
Mean annual precipitation: 864 to 1119 mm (34 to 44 in)
Mean annual air temperature: 18.7 to 21.1 degrees C (65.7 to 70 degrees F)
Frost-free period: 240 to 276 days
Elevation: 41.6 to 193.5 m (136 to 635 ft)
Thornthwaite P-E Index: 54 to 66
GEOGRAPHICALLY ASSOCIATED SOILS: These are the
Axtell,
Crockett,
Lufkin, and
Rader series.
Axtell and
Rader soils: are on similar positions.
Crockett soils: are on slightly higher positions.
Lufkin soils: are on slightly concave and lower positions in the landscape.
DRAINAGE AND PERMEABILITY: Moderately well drained. Permeability is very slow. Runoff is low on slopes less than 1 percent, medium on 1 to 3 percent slopes, and high on 3 to 5 percent slopes. Internal drainage is very slow. A water table exists for a few days to several weeks during November to March.
USE AND VEGETATION: Extensively cultivated in the past, but now mostly in unimproved pasture. Some areas are farmed to cotton, grain sorghum, peanuts, and corn. Native vegetation is bunch grasses such as bluestems, Indiangrass, and Purple top. Common trees consist of post oak, blackjack oak, elm, and hackberry.
DISTRIBUTION AND EXTENT: Mainly in east central Texas. The soil is extensive.
MLRA SOIL SURVEY REGIONAL OFFICE (MO) RESPONSIBLE: Temple, Texas
SERIES ESTABLISHED: Angelina County, Texas; 1903.
REMARKS: Classification change from Udertic Paleustalfs to Oxyaquic Vertic Paleustalfs based on recognition that these soils have short periods of iron reduction and oxidation evidenced by small zones of iron concentration and diffuse zones of iron depletion within 102 cm (40 in) of the surface. In addition, associated soils have demonstrated the same micromorphological responses to short periods of oxidation and, to a lesser extent, reduction.
Ochric epipedon: 0 to 36 cm (0 to 14 in) (Ap and E horizons)
Argillic horizon: 36 to 203 cm (14 to 80 in) (Bt, Btg, and BCtg horizons)
Abrupt textural change: 36 cm (14 in) between the E and Bt1 horizon.
Albic materials: 15 to 36 (6 to 14 in) (E horizon)
Redox depletions with chroma of 2 or less: 145 to 203 cm (57 to 80 in) (Btg, BCtg1, BCtg2 horizons)
Redox concentrations: 0 to 203 cm (0 to 80 in)
Vertic features: 36 to 145 cm (14 to 57 in) COLE greater than 0.07.
Endosaturation: The zone of saturation at 145 to 203 cm (57 to 80in). (Btg, BCtg1, BCtg2 horizons)
ADDITIONAL DATA: TAMU data S87TX-041-001 AND S86TX-041-02.
Soil Interpretation Record No.: TX0001
Taxonomic Version: Keys to Soil Taxonomy, Twelfth Edition, 2014.
National Cooperative Soil Survey
U.S.A.