LOCATION CAMPTOWN                TX

Established Series
RD-JKW-RM
07/2014

CAMPTOWN SERIES

The Camptown series consists of very deep, very poorly drained and ponded soils. These soils formed in loamy fluviomarine deposits of the Beaumont Formation of late Pleistocene age. These nearly level soils are in long and narrow relict stream meander channels and depressions. 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, thermic Natric Vermaqualfs

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

A--0 to 13 cm, (0 to 5 in); dark gray (10YR 4/1) silt loam; moderate fine subangular blocky structure; slightly hard, friable; many fine and medium roots; 10 percent crawfish krotovina; 1 percent prominent strong brown (7.5YR 4/6) masses of oxidized iron with sharp boundaries along root channels; 20 percent fine and medium distinct light brownish gray (10YR 6/2) iron depletions with clear boundaries adjacent to masses of oxidized iron; very strongly acid; clear wavy boundary. (8 to 15 cm [3 to 6 in] thick)

Bg--13 to 20 cm, (5 to 8 in); gray (10YR 5/1) silt loam; weak subangular blocky structure; slightly hard, friable; many fine and medium roots; common fine vesicular and tubular pores; 50 percent crawfish krotovina; 2 percent distinct yellowish brown (10YR 5/4) masses of oxidized iron with diffuse boundaries along root channels; very strongly acid; gradual irregular boundary. (7 to 58 cm [3 to 23 in] thick)

Btg/E1--20 to 36 cm, (8 to 14 in); gray (10YR 6/1) silt loam (E) and 40 percent gray (10YR 5/1) silt clay loam (Bt); weak medium prismatic structure parting to moderate medium subangular blocky; slightly hard, friable; common fine and few medium roots; common fine vesicular and tubular pores; 55 percent crawfish krotovina; 8 percent medium prominent yellowish red (5YR 5/6) masses of oxidized iron with clear and sharp boundaries in E material and along root channels; about 10 percent of the matrix is brittle: very strongly acid; gradual wavy boundary.

Btg/E2--36 to 89 cm, (14 to 35 in); gray (10YR 5/1) silty clay loam (Bt)and 20 percent gray (10YR 6/1) streaks 2.5 to 8 cm (1 to 3 in) wide of albic material (E); weak medium prismatic structure parting to moderate medium subangular blocky; hard, friable; common fine and few medium roots; common fine vesicular and tubular pores; few distinct gray (10YR 5/1) clay films; 55 percent crawfish krotovina; 20 percent medium prominent yellowish brown (10YR 5/6) masses of oxidized iron with diffuse boundaries on faces of peds; 8 percent prominent reddish brown (5YR 4/4) masses of oxidized iron with clear and sharp boundaries along root channels; very strongly acid; gradual wavy boundary.

Btg/E3--89 to 102 cm, (35 to 40 in); dark gray (10YR 4/1) silty clay loam (Bt) and 20 percent streaks, 2.5 to 8 cm (1 to 3 in) wide, of gray (10YR 5/1) silt loam albic material(E); weak medium prismatic structure parting to moderate medium subangular blocky; hard, friable; common fine vesicular and tubular pores; few prominent dark gray (10YR 4/1) clay films; 45 percent crawfish krotovina; 20 percent medium prominent reddish brown (5YR 4/4) masses of oxidized iron with sharp boundaries in matrix; 8 percent medium prominent yellowish brown (10YR 5/6) masses of oxidized iron with diffuse boundaries on faces of peds; very strongly acid; gradual wavy boundary. (combined thickness of the Btg/E horizon is 25 to 114 cm [10 to 45 in])

Btg1--102 to 147 cm, (40 to 58 in); dark gray (10YR 4/1) silty clay; moderate medium angular blocky structure; hard, firm; few fine roots; few dark gray (10YR 4/1) clay films; 15 percent crawfish krotovina 15 percent medium prominent reddish brown (5YR 4/4) and yellowish red (5YR 5/6) masses of oxidized iron with clear and sharp boundaries on faces of peds; very strongly acid; gradual wavy boundary.

Btg2--147 to 183 cm, (58 to 72 in); dark gray (10YR 4/1) silty clay; moderate medium angular blocky structure; hard, firm; few fine roots; few dark gray (10YR 4/1) clay films; 5 percent crawfish krotovina; 2 percent fine distinct very dark brown (10YR 2/2) iron-manganese stains along roots; 40 percent prominent reddish brown (5YR 4/4) and yellowish red (5YR 5/6) masses of oxidized iron with clear boundaries on faces of peds; few fine gypsum crystals; very strongly acid; gradual wavy boundary. (combined thickness of the Btg horizon is 40 to 117 cm [16 to 46 in])

Bt--183 to 203 cm, (72 to 80 in); 60 percent brown (10YR 5/3) and 40 percent yellowish red (5YR 5/6) silty clay; moderate medium angular blocky structure; hard, firm; few dark gray (10YR 4/1) clay films; 5 percent crawfish krotovina; few gypsum crystals; few fine masses of barite; very strongly acid.

TYPE LOCATION: Orange County, Texas; from intersection of Farm Road 105 and Farm Road 1135 north of Vidor, 5.6 miles northwest on Farm Road 1135 to forest road (about 0.5 miles south of the Jasper County line); 300 yards east on forest road; 100 ft north in swamp. (Pine Forest USGS quad; Latitude: 30 degrees 13 minutes 19 seconds N; Longitude: 94 degrees 05 minutes 17 seconds W; WGS84.

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)
Depth to argillic horizon: 15 to 46 cm (6 to 18 in)

Particle-size control section (weighted average)
Clay content: 20 to 35 percent
Crawfish krotovina: 50 to 70 percent
Exchangeable sodium percentage: 12 to 15
CEC/clay ratio: 0.40 to 0.60

A Horizon
Hue: 10YR
Value: 3 to 5
Chroma: 1 or 2
Texture: loam or silt loam
Clay content: 5 to 20 percent
Crawfish krotovina: 2 to 20 percent
Masses of oxidized iron: amount 0 to 5 percent, location-lining pores, color-shades of brown and yellow
Iron depletions: 0 to 20 percent; location-adjacent to masses of oxidized iron; color-shades of gray
Exchangeable sodium percentage: 2 to 8
Reaction: extremely acid to moderately acid

Bg Horizon
Hue: 10YR or 2.5Y
Value: 5 to 7
Chroma: 1 or 2
Texture: loam or silt loam
Clay content: 5 to 25 percent
Crawfish bioturbation: 45 to 65 percent
Masses of oxidized iron: amount 2 to 12 percent, location-faces of peds or lining pores, color-shades of brown, yellow or red
Exchangeable sodium percentage: 2 to 12
Reaction: extremely acid to moderately acid

Btg/E Horizon
Hue: 10YR or 2.5Y
Value: 5 to 7
Chroma: 1 or 2
Texture: loam, silt loam, silty clay loam or clay loam
Clay content: 18 to 39.8 percent
Crawfish krotovina: 35 to 60 percent
Masses of oxidized iron: amount-5 to 35 percent, location-faces of peds or lining pores, color-shades of brown, yellow or red
Exchangeable sodium percentage: 12 to 27
Reaction: extremely acid to neutral

Btg Horizon
Hue: 10YR or 2.5Y
Value: 5 to 7
Chroma: 1 or 2
Texture: loam, silty clay loam,clay loam, clay, or silty clay
Clay content: 24 to 60 percent
Crawfish bioturbation: 5 to 35 percent
Masses of oxidized iron: amount-5 to 35 percent, location-faces of peds, matrix or lining pores; color-shades of brown, yellow or red
Barite masses: 0 to 2 percent
Exchangeable sodium percentage: 8 to 30
Reaction: extremely acid to slightly alkaline

Bt Horizon
Hue: 2.5YR to 2.5Y (variegated matrix)
Value: 5 or 6
Chroma: 1 or 2
Texture: clay, or silty clay
Clay content: 40 to 50 percent
Crawfish bioturbation: 2 to 15 percent
Masses of oxidized iron: amount-5 to 35 percent, size-fine to coarse, contrast-faint to prominent, boundary-clear or sharp, location-throughout, color-shades of brown, yellow or red
Barite masses: 1 to 4 percent
Gypsum crystals: 0 to 4 percent
Exchangeable sodium percentage: 12 to 25
Reaction: very strongly acid to moderately acid

COMPETING SERIES: This is the Nona (TX) series in the same family. Similar soils include the Cieno (TX), Evadale (TX), Gessner (TX), Guyton (LA), Leton (TX), Plank (TX), Sorter (TX), and the proposed Tomball (TX) series.

Nona soils: are not ponded; are poorly drained.
Cieno, Gessner, and Tomball soils: have a fine-loamy particle-size control section; hyperthermic temperature regime
Evadale and Guyton soils: do not have at least 50 percent crawfish activity; do not have an exchangeable sodium percentage greater than 7
Leton soils: hyperthermic temperature regime
Plank soils: have a coarse-silty particle-size control section
Sorter soils: have a coarse-loamy particle-size control section

GEOGRAPHIC SETTING:
Parent material: loamy fluviomarine deposits derived from the Beaumont Formation of Pleistocene age
Landscape: flat coastal plains
Landform: relict meander belt
Microfeature: channels
Slope: 0 to 1 percent
Mean annual air temperature range: 19.5 to 20.6 degrees C (67 to 69 degrees F)
Mean annual precipitation range: 1219 to 1524 mm (48 to 60 in)
Precipitation Pattern: Rainfall is fairly uniform throughout the year with slight peaks in the fall and spring months.
Frost-free period: 240 to 300 days
Elevation: 3 to 30.5 m (10 to 100 ft)

GEOGRAPHICALLY ASSOCIATED SOILS: These are the Batson (TX), Evadale, Gist, and Texla (TX) series.
Batson soils: are moderately well drained; on a higher convex landform
Evadale soils: are poorly drained; on a higher flat landform
Gist soils: are moderately well drained; on mounds in a complex with the Evadale soils on a higher flat landscape position
Texla soils: are somewhat poorly drained; on mounds in a complex with the Evadale soils on a higher flat landscape position or as a convex ridge consociation

DRAINAGE AND PERMEABILITY: Very poorly drained. Permeability is very slow. Runoff is negligible. These soils are ponded 0 to 30 cm (0 to 12 in) above the mineral soil surface from December to August and have aquic conditions in most years.

USE AND VEGETATION: These soils are used mainly for wildlife habitat. Native trees are dominated by red maple, tupelo, cypress, and occasional water and willow oaks.

DISTRIBUTION AND EXTENT: Southeast Texas mainly east of the Trinity River and possibly southwestern Louisiana; LRR T; Western Gulf Coast Flatwoods (MLRA 152B); moderate extent

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

SERIES ESTABLISHED: Orange County, Texas, 1996.

REMARKS: These soils were formerly included with the ponded phase of the Evadale series. The classification was changed from a Typic Glossaqualfs to Natric Vermaqualfs during the correlation of the MLRA 152B update. Data from the Texas A&M University Soil Characterization laboratory from Hardin County,TX (S96TX-199-006) show exchangeable sodium percentages of 8 and higher in the Eg horizon. Pedon descriptions throughout MLRA 152B and a reexamination at the series type location indicate more than 50 percent crawfish bioturbation in some portion of the profile within 100 cm (40 in) in depth.

Diagnostic horizons and features recognized in this pedon are:

Particle size control section: 20 to 70 cm (8 to 28 in). (Btg/E1 and Btg/E2 horizons)
Ochric epipedon: 0 to 13 cm (0 to 5 in) (A horizon)
Cambic horizon: 13 to 20 cm (5 to 8 in)(Bg horizon)
Glossic horizon: 20 to 102 cm (8 to 40 in) (Btg/E1, Btg/E2, and Btg/E3 horizons)
Argillic horizon: 20 to 203 cm (8 to 80 in) (Btg/E horizons, Btg and Bt horizons)

The assignment of the cation-exchange activity class is supported by laboratory data number S96TX-199-006 from a representative pedon in Hardin County, Texas.

ADDITIONAL DATA: Data from the Texas A&M University Soil Characterization laboratory exists from laboratory number S96TX-199-006 for a representative pedon in Hardin County, Texas.

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

---

National Cooperative Soil Survey
U.S.A.