LOCATION REXVILLE                TX

Established Series
JKW-RM
08/2018

REXVILLE SERIES

The Rexville series consists of very deep, somewhat poorly drained, very slowly permeable soils that formed in loamy alluvium of Holocene age. These nearly level soils occur on flats on river and stream terraces on the coastal plains. Slope ranges from 0 to 1 percent. Mean annual precipitation is about 1092 mm (43 in), and mean annual air temperature is about 20.6 degrees C (69 degrees F).

TAXONOMIC CLASS: Fine-loamy, siliceous, active, hyperthermic Typic Epiaqualfs

TYPICAL PEDON: Rexville fine sandy loam, in an area of Kuy-Rexville complex, 0 to 1 percent slopes; elevation is 47 m (156 ft). (Colors are for moist soil unless otherwise stated.)

A1--0 to 41 cm, (0 to 16 in); dark grayish brown (10YR 4/2) fine sandy loam; weak fine subangular blocky structure; friable; common fine roots throughout; common very fine interstitial and many fine interstitial pores; few crawfish krotovina; 6 percent fine distinct dark yellowish brown (10YR 4/6) masses of oxidized iron with sharp boundaries lining pores; strongly acid; gradual wavy boundary. (Combined thickness of the A horizons is 33 to 76 cm [13 to 30 in])

A2--41 to 59 cm, (16 to 23 in); grayish brown (10YR 5/2) fine sandy loam; weak fine subangular blocky structure; friable; many very fine roots throughout; many very fine tubular pores; few crawfish krotovina; 7 percent fine distinct brownish yellow (10YR 6/6) masses of oxidized iron with sharp boundaries lining pores; strongly acid; clear smooth boundary.

Bt1--59 to 115 cm, (23 to 45 in); gray (10YR 5/1) clay loam; weak fine prismatic structure parts to weak fine subangular blocky; firm; common very fine roots throughout; common fine tubular pores; few crawfish krotovina; 5 percent distinct clay films on all faces of peds and 6 percent distinct clay films on all faces of peds; 10 percent medium faint gray (N 6/) iron depletions with clear boundaries in matrix surrounding redox concentrations and 15 percent medium prominent brownish yellow (10YR 6/8) masses of oxidized iron with sharp boundaries in matrix; slightly acid; gradual wavy boundary.

Bt2--115 to 135 cm, (45 to 63 in); gray (10YR 6/1) clay loam; weak fine prismatic structure parts to weak fine subangular blocky; firm; few very fine roots; few very fine tubular pores; 4 percent distinct clay films on all faces of peds and 5 percent distinct clay films on all faces of peds; 1 percent fine prominent red (2.5YR 4/6) masses of oxidized iron with sharp boundaries in matrix and 1 percent fine strong brown (7.5YR 4/6) ironstone nodules and 3 percent medium faint gray (N 6/) iron depletions with clear boundaries in matrix surrounding redox concentrations and 3 percent fine black (10YR 2/1) iron-manganese nodules and 20 percent medium prominent brownish yellow (10YR 6/8) masses of oxidized iron with sharp boundaries in matrix; neutral; gradual smooth boundary. (Combined thickness of the Bt horizons is 126 to 170 cm [50 to 67 in])

Bt3--135 to 203 cm, (63 to 80 in); gray (10YR 6/1) clay loam; weak fine prismatic structure parts to weak fine subangular blocky; firm; 4 percent distinct clay films on all faces of peds and 5 percent distinct clay films on all faces of peds; 2 percent fine irregular black (10YR 2/1) iron-manganese nodules and 4 percent medium faint gray (N 6/) iron depletions with clear boundaries in matrix surrounding redox concentrations and 12 percent medium prominent brownish yellow (10YR 6/6) masses of oxidized iron with sharp boundaries in matrix; electrical conductivity is 1.1; sodium adsorption ratio is 11; slightly alkaline.

TYPE LOCATION: Austin County, TX; from the intersection of Texas Highway 36 and FM 1093 in Wallis, Texas, about 4 miles west on FM 1093 to private ranch road; 2.1 miles west, then 0.3 mile north, then 2.1 miles northwest, then 0.4 mile northeast, then 0.4 mile northwest on a low flat in rangeland.

USGS topographic quadrangle: Rexville, TX
Latitude: 29 degrees, 40 minutes, 1 seconds N
Longitude: 96 degrees, 11 minutes, 46 seconds W

Decimal Degrees
Latitude: 29.6669389
Longitude: -96.1962306
Datum: WGS84

RANGE IN CHARACTERISTICS:
Soil Moisture: An Udic soil moisture regime. The soil moisture control section is moist in some or all parts for than 300 days in normal years. Mean annual soil temperature: 21.1 to 22.2 degrees C (71 to 72 degrees F) Depth to argillic horizon: 33 to 76 cm (13 to 30 in)

Particle-size control section (weighted average):
Total clay content: 22 to 34 percent

A1 and A2 horizons:
Hue: 10YR
Value: 4 or 5
Chroma: 1 or 2
Texture: fine sandy loam or loam
Total clay content: 7 to 17 percent
Redox concentrations: amount-1 to 20; color-shades of brown or yellow
Iron-manganese concentrations: amount-0 to 25 percent; kind-masses
Electrical conductivity (dS/cm): 0 to 0.3
Sodium adsorption ratio (SAR): 0 to 2
Reaction (pH): very strongly acid to moderately acid

Bt1 and Bt2 horizon:
Hue: 7.5YR or 10YR
Value: 4 to 6
Chroma: 1 or 2
Texture: sandy clay loam or clay loam
Total clay content: 21 to 34 percent
Redox concentrations: amount-1 to 20 percent; color-shades of brown, yellow or red;
Redox depletions: amount-0 to 10; color-shades of gray
Iron-manganese concentrations: amount-0to 20; kind-masses
Electrical conductivity (dS/cm): 0 to 0.8
Sodium adsorption ratio (SAR): 0 to 7
Reaction (pH): strongly acid to neutral

Bt3 horizon:
Hue: 10YR, 2.5Y or N
Value: 5 to 7
Chroma: 1 or 2
Texture: sandy clay loam or clay loam
Total clay content: 22 to 35 percent
Redox concentrations: amount-3 to 30 percent; shades of yellow, brown, or red (red redox features are less than 20 percent)
Redox depletions: amount-0 to 15 percent; color-shades of gray;
Iron-manganese concentrations: amount-0 to 5; size-; kind-masses and nodules
Electrical conductivity (dS/cm): 0.2 to 2.3
Sodium adsorption ratio (SAR): 2 to 15
Reaction (pH): moderately acid to slightly alkaline

COMPETING SERIES:
There are no series in the same family. Similar soils are the Aris, Clodine, Cyfair, Nada, and Snakecreek series.
Aris soils: are in a fine-silty family
Clodine soils: are in a coarse-loamy family
Cyfair, Nada, and Snakecreek; do not have aquic conditions

GEOGRAPHIC SETTING:
Parent material: loamy alluvium of Holocene age
Landscape: coastal plains
Landform: flats on river and stream terraces
Slope: 0 to 1 percent
Precipitation Pattern: Rainfall is mostly uniform throughout the year with slight peaks during the spring and fall months
Mean annual precipitation: 1092 to 1194 mm (43 to 47 in)
Mean annual air temperature: 69 to 71 degrees C (20.6 to 21.7 degrees F)
Frost-free period: 271 to 300 days
Elevation: 45 to 80 m (150 to 263 ft)

GEOGRAPHICALLY ASSOCIATED SOILS:
These are the Chesterville, Cyfair, Katy, Kuy, and Snakecreek series.
Chesterville soils: are on pimple mounds associated with the Lissie Formation
Cyfair soils: are on flats associated with the Lissie Formation
Katy soils: are moderately well drained; on the Lissie Formation
Kuy soils: are sandy; on oblong mounds adjacent to the Rexville soils
Snakecreek soils: are somewhat poorly drained; are on stream flood plains

DRAINAGE AND PERMEABILITY:
Drainage class: somewhat poorly
Permeability class: very slow
Runoff: high
Flooding: None
Ponding: None
Seasonal water table: Episaturation occurs between depths of 0 to 76 cm (0 to 2.5 ft) of the surface during the months of January to March in normal years.

USE AND VEGETATION:
Used for rangeland and wildlife habitat. Native vegetation consists of bluestems, paspalums, and sedges.

DISTRIBUTION AND EXTENT:
General area: Along streams and rivers of the upper Texas Gulf Coast;
Land Resource Region: T- Atlantic and Gulf Coast Lowland Forest and Crop Region
MLRA 150A- Gulf Coast Prairies
Extent: small

SOIL SURVEY REGIONAL OFFICE (SSRO) RESPONSIBLE: Temple, Texas

SERIES PROPOSED: Austin County, Texas, 2018. The name is from a small community in southwest Austin County.

REMARKS: The series was formerly included in the Aris series. The series was separated based on classification and landform.

Diagnostic horizons and features recognized in this pedon are:
Particle-size control section: 59 to 109 cm (23 to 43 in) (upper Bt1 horizon)
Ochric epipedon: 0 to 59 cm (0 to 23 in) (A1 and A2 horizons)
Argillic horizon: 59 to 203 cm (23 to 80 in) (Bt1, Bt2, and Bt3 horizons)
Aquic conditions: 41 to 115 cm (16 to 45 in)

Additional Comments:
The assignment of the cation-exchange activity class is supported by MLRA Soil Survey Office laboratory data number S2017TX0152001 from Austin County, Texas.

ADDITIONAL DATA: MLRA Soil Survey Office laboratory data from type location S2017TX0152001. Additional article-size analysis, salinity and sodicity tests were performed at the project office on pedons S2018TX0154100, S2000TX0159007, S2000TX9005, S2000TX0159003.

Taxonomic Version: Keys to Soil Taxonomy, Twelfth Edition, 2014

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National Cooperative Soil Survey
U.S.A.