LOCATION SOURLAKE                TX

Established Series
JKW-ALS-RM
07/2014

SOURLAKE SERIES

The Sourlake series consists of very deep, poorly drained soils that formed in loamy alluvial deposits of Holocene age. These soils are meandering channels of creeks and streams. Slope ranges from 0 to 1 percent but mainly less than 1 percent. Mean annual temperature is about 19.5 degrees C (67 degrees F), and mean annual precipitation is about 1422 mm (56 in).

TAXONOMIC CLASS: Fine-silty, siliceous, active, acid, thermic Fluvaquentic Endoaquepts

TYPICAL PEDON: Sourlake loam-bottomland hardwood forest. (Colors are for moist soil unless otherwise stated.)

A--0 to 10 cm (0 to 4 in); dark grayish brown (10YR 4/2) moist, loam; massive; friable, soft; many fine and medium roots throughout; common fine and medium interstitial pores; 3 percent fine prominent masses of oxidized iron with clear boundaries lining pores; 2 percent fine prominent strong brown (7.5YR 5/8) masses of oxidized iron with sharp boundaries lining pores; 1 percent fine worm casts; 1 percent crayfish krotovinas; very strongly acid; abrupt smooth boundary. (8 to 36 cm [3 to 14 in] thick)

Bw--10 to 48 cm (4 to 19 in); light brownish gray (10YR 6/2) moist, loam; massive; firm, slightly hard; many very fine and fine roots throughout; common medium roots throughout; many fine and very fine tubular pores; 2 percent fine distinct spherical weakly cemented very dark brown (10YR 2/2) iron-manganese nodules with sharp boundaries in matrix; 2 percent fine distinct very dark grayish brown (10YR 3/2)iron-manganese masses with sharp boundaries in matrix; 8 percent fine distinct brownish yellow (10YR 6/6) masses of oxidized iron with clear boundaries lining pores; 2 percent crayfish krotovinas; extremely acid; gradual smooth boundary. (18 to 61 cm [7 to 24 in])

Bg1--48 to 89 cm (19 to 35 in); gray (10YR 6/1) moist, loam; massive; firm, slightly hard; common coarse roots and common very fine roots throughout; common very fine tubular pores; 2 percent medium prominent spherical weakly cemented very dark grayish brown (10YR 3/2) iron-manganese nodules with sharp boundaries in matrix; 5 percent fine prominent strong brown (7.5YR 5/8) masses of oxidized iron with clear boundaries in matrix ; 8 percent medium prominent brownish yellow (10YR 6/6) masses of oxidized iron with clear boundaries in matrix; 2 percent crayfish krotovinas; very strongly acid; gradual wavy boundary. (combined thickness of the Bg layers is 143 to 186 cm [56 to 73 in])

Bg2--89 to 114 cm (35 to 45 in); light brownish gray (10YR 6/2) moist, stratified, loam; massive; firm, slightly hard; common very fine roots throughout; common very fine tubular pores; 3 percent fine prominent brown (7.5YR 4/4) iron-manganese masses with sharp boundaries in matrix; 8 percent medium prominent reddish yellow (7.5YR 6/8) masses of oxidized iron with clear boundaries in matrix; 5 percent medium prominent yellowish red (5YR 5/8) masses of oxidized iron with clear boundaries in matrix; 2 percent crayfish krotovinas; few strata of very fine sand and clay 1 to 2 cm thick; very strongly acid; gradual wavy boundary.

Bg3--114 to 155 cm (45 to 61 in); light gray (2.5Y 7/1) moist, stratified, loam; massive; firm, hard; common very fine roots throughout; many very fine tubular pores; 2 percent fine prominent dark brown (7.5YR 3/2) iron-manganese masses with sharp boundaries in matrix, 20 percent medium prominent strong brown (7.5YR 5/8) masses of oxidized iron with clear boundaries in matrix; 8 percent medium prominent yellowish red (5YR 5/8) masses of oxidized iron with clear boundaries in matrix; 10 percent medium prominent brownish yellow (10YR 6/8) masses of oxidized iron with clear boundaries lining pores; 2 percent crayfish krotovinas; few strata of very fine sand and clay 1 to 2 cm thick; very strongly acid; gradual wavy boundary.

Bg4--155 to 180 cm (61 to 71 in); gray (2.5Y 6/1) moist, loam; massive; firm, hard; 3 percent fine prominent dark brown (7.5YR 3/2) iron-manganese masses with sharp boundaries in matrix; 8 percent fine prominent strong brown (7.5YR 5/8) masses of oxidized iron with sharp boundaries in matrix; 10 percent fine prominent brownish yellow (10YR 6/8) masses of oxidized iron with diffuse boundaries in matrix; 3 percent fine prominent greenish gray (10Y 6/1) iron depletions with diffuse boundaries lining pores; 2 percent medium distinct bluish gray (10B 6/1) iron depletions with diffuse boundaries lining pores; 2 percent crayfish krotovinas; very strongly acid; gradual wavy boundary.

Bg5--180 to 203 cm (71 to 80); light gray (5Y 7/1) moist, loam; massive; firm, hard; common very fine roots; common very fine tubular pores; 3 percent fine prominent dark brown (7.5YR 3/2) iron-manganese masses with sharp boundaries in matrix; 20 percent coarse prominent brownish yellow (10YR 6/8) masses of oxidized iron with diffuse boundaries in matrix; 2 percent medium distinct bluish gray (5B 6/1) iron depletions with diffuse boundaries lining pores; 1 percent crayfish krotovinas; strongly acid.

TYPE LOCATION: Hardin County, Texas; from the intersection of Farm Road 787 and Farm Road 770 in Saratoga; 1.5 miles east on Farm Road 770 to Rozier Park Road; 0.7 mile south on Rozier Park Road, then 2 miles east on park road; 900 feet southwest along Little Pine Island Bayou; Latitude: 30 degrees 14 minutes 29.8 seconds N; Longitude: 94 degrees 28 minutes 55.0 seconds W.; Sour Lake topographic quadrangle; NAD 83

RANGE IN CHARACTERISTICS:
Soil Moisture: An aquic soil moisture regime. .
Mean annual soil temperature: 20.6 to 21.7 degrees C (69 to 71 degrees F)

Particle-size control section (weighted average)
Clay content: 19 to 30 percent
Percent sands larger than very fine sand: 5 to 15 percent

A Horizon
Hue: 10YR or 2.5Y
Value: 4 to 6
Chroma: 1 or 2
Clay content: 5 to 20 percent
Texture: silt loam or loam
Redox concentrations: amount-0 to 25 percent, shades- brown or yellow
Reaction: extremely acid to strongly acid

Bw Horizon
Hue: 10YR or 2.5Y
Value: 5 to 7
Chroma: 1 or 2
Texture: loam, silt loam, clay loam, or silty clay loam
Clay content: 10 to 35
Redox concentrations: amount-5 to 30 percent, shades- brown, red, or yellow
Redox depletions: amount-0 to 15 percent, shades- gray, green, blue
Reaction: extremely acid or very strongly acid

Bg Horizons
Hue: N, 10YR, 2.5Y, or 5Y
Value: 5 to 7
Chroma: 0 or 2
Texture: loam, silt loam, clay loam, or silty clay loam
Clay content: 15 to 30
Redox concentrations: amount-5 to 30 percent, shades- brown, red, or yellow
Redox depletions: amount-0 to 15 percent, shades- gray, green, blue
Reaction: very strongly acid to neutral

COMPETING SERIES: These are the Manco and Pophers series in the same family. Similar soils are the Angelina (TX), Bleakwood (TX), Cowmarsh (TX) (T), and Pluck (TX) series.

Manco soils: are somewhat poorly drained and are at higher elevations
Pophers soils: have buried horizons and higher SAR in lower subhorizons
Angelina soils: have more than 15 percent sands larger than very fine sand in the particle-size control section
Bleakwood and Pluck soils: fine-loamy family
Cowmarsh soils: have a fine particle-size control section

GEOGRAPHIC SETTING:
Parent material: loamy alluvium of mixed sources of Holocene age.
Landscape: river valley
Landform: flood plains
Slope: 0 to 1 percent but mostly less than 0.5 percent
Mean annual air temperature range: 19.5 to 20.6 degrees C (67 to 68 degrees F)
Mean annual precipitation range: 1219 to 1473 mm (48 to 58 in)
Precipitation Pattern: Rainfall is fairly uniform throughout the year
Frost-free period: 240 to 300 days
Elevation: 6 to 46 m (20 to 150 ft)
Thornthwaite annual P-E indices: 72 to 80

GEOGRAPHICALLY ASSOCIATED SOILS: These are the Bevil (TX), Camptown (TX), Evadale (TX), Gist (TX), Texla (TX), and Vamont (TX) soils.
Bevil and Vamont soils: are clayey throughout; are on relict backswamp areas of the Beaumont Formation Formation
Camptown and Evadale soils: have an argillic horizon; are on coastal plain flats of the Beaumont Formation Formation
Gist and Texla soils: have an argillic horizon; are on mounds of the Beaumont Formation Formation

DRAINAGE AND PERMEABILITY: poorly drained. Runoff is high. Frequently flooded for brief to long periods in normal years.

USE AND VEGETATION: Used for wildlife habitat. Native vegetation consists of water oak, black maple, and green ash.

DISTRIBUTION AND EXTENT: Southeast, Texas from the Trinity River to the Sabine River; Land Resource Region T; MLRA 152B; the series is of small extent.

MLRA SOIL SURVEY REGIONAL OFFICE (MO) RESPONSIBLE: Temple, Texas

SERIES PROPOSED: Hardin County, Texas, 2012, MLRA 152B Soil Survey Update, Texas, 2013. The name is coined from the city of Sour Lake in Hardin County, Texas.

REMARKS: The series was formerly included in the Manco and Mantachie series. The Manco series is in MLRA 133B, at a higher elevation and in a shorter period frost free days. The Mantachie series is associated with the Southern Coastal Plain MLRA.

Diagnostic horizons and features recognized in this pedon are:
Particle size control section: 25 to 100 cm (10 to 40 in). (A, Bw, Bg1 horizons)
Ochric epipedon: 0 to 10 cm (0 to 4 in). (A horizon)
Aquic conditions: 0 to 203 cm (0 to 80 in)

Additional Comments: The mineralogy is assumed based on similar soils.

ADDITIONAL DATA: Particle-size analysis and pH tests were performed at the project office on 5 pedons. KSSL data on S12TX1992414. This pedon is a taxadjunct to the series since this pedon has less than 18 percent clay in the particle-size control section.

Taxonomic Version: Keys to Soil Taxonomy, Eleventh Edition, 2010

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National Cooperative Soil Survey
U.S.A.