LOCATION KIRBYVILLE              TX+LA

Established Series
CLN-JKW-RM
07/2014

KIRBYVILLE SERIES

The Kirbyville series consists of very deep, moderately well to somewhat poorly drained soils. These nearly level to very gently sloping soils formed in loamy fluviomarine deposits of the Lissie Formation of early to mid-Pleistocene age. Slope ranges from 0 to 2 percent. Mean annual temperature is about 19.4 degrees C (67 degrees F), and mean annual precipitation is about 1295 mm (51 in).

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

TYPICAL PEDON: Kirbyville fine sandy loam--forest.(Colors are for moist soil unless otherwise stated.)

A--0 to 13 cm, (0 to 5 in); grayish brown (10YR 5/2) fine sandy loam; weak medium subangular blocky structure; soft, friable; many fine, medium, and few coarse roots; common fine and medium interstitial and tubular pores; 2 percent fine faint gray (10YR 6/1) clean sand grains along roots and pores; extremely acid; clear smooth boundary. (10 to 20 cm [4 to 8 in] thick)

E1--13 to 23 cm, (5 to 9 in); pale brown (10YR 6/3) fine sandy loam; weak medium subangular blocky structure; soft, friable; many fine and medium roots; common very fine and fine interstitial and tubular pores; 10 percent fine and medium faint yellowish brown (10YR 5/4) iron concentrations with clear boundaries; 5 percent medium distinct gray (10YR 6/1) clean sand grains along roots and pores; extremely acid; clear smooth boundary.

E2--23 to 46 cm, (9 to 18 in); very pale brown (10YR 7/4) loam; weak medium prismatic structure parting to subangular blocky; soft, friable; common very fine, fine, and medium roots; common very fine and fine tubular pores; 1 percent fine prominent strong brown (7.5YR 5/6) iron concentrations with clear boundaries; 2 percent fine faint light gray (10YR 7/2) clean sand along roots and pores; few rounded ironstone pebbles about 5 to 10 mm in size; extremely acid; gradual smooth boundary. (Combined thickness of the E horizons is 15 to 43 cm [6 to 17 in].)

Bt/E--46 to 89 cm, (18 to 35 in); light yellowish brown (10YR 6/4) sandy clay loam; 20 percent of the horizon is interfingering of very pale brown (10YR 7/3) fine sandy loam (E); moderate fine and medium prismatic structure parting to moderate medium subangular blocky; slightly hard, friable; common very fine roots; common very fine tubular pores; few distinct yellowish brown (10YR 5/4) clay films on faces of peds; 10 percent fine and medium distinct yellowish brown (10YR 5/8) iron concentrations with sharp boundaries in ped interiors; 1 percent medium faint light gray (10YR 7/2) iron depletions with sharp boundaries on faces of peds; 2 percent rounded ironstone nodules about 5 to 10 mm in size; 2 percent fine and medium red (2.5YR 4/6) plinthite; very strongly acid; clear irregular boundary. (18 to 44 cm [2 to 17 in] thick)

Btcv/E--89 to 142 cm, (35 to 56 in); strong brown (7.5YR 5/8) sandy clay loam; 15 percent of the horizon is interfingering of very pale brown (10YR 7/3) fine sandy loam (E); moderate medium prismatic structure parting to subangular blocky; slightly hard, friable; common very fine roots; common fine tubular pores; few distinct strong brown (7.5YR 5/6) clay films on faces of peds; 15 percent gray (10YR 6/1) iron depletions and are clay depletions due to aquic conditions; 4 percent medium prominent red (2.5YR 4/6) iron concentrations; 8 percent fine and medium red (2.5YR 4/6) plinthite; 5 percent fine and medium rounded ironstone nodules; very strongly acid; clear irregular boundary. (46 to 88 cm [18 to 35 in] thick)

Btv/Eg1--142 to 180 cm, (56 to 71 in); 40 percent brownish yellow (10YR 6/6) and 20 percent brownish yellow (10YR 6/8) sandy clay loam; 25 percent of the horizon is interfingering of light gray (10YR 7/1) fine sandy loam (E) that is a clay depletion due to aquic conditions; moderate medium prismatic structure parting to subangular blocky; hard, firm; few fine roots; common very fine tubular pores; 2 percent distinct brownish yellow (10YR 6/8) clay films on faces of peds; 5 percent fine and medium prominent red (2.5YR 4/6) iron concentrations; 2 percent light gray (10YR 7/1) iron depletions on faces of peds; 8 percent fine and medium red (2.5YR 4/6) plinthite; 2 percent fine and medium ironstone nodules; very strongly acid; gradual wavy boundary. (Combined thickness of Btv/Eg horizon is 51 to 76 cm [20 to 30 in].)

Btv/Eg2--180 to 203 cm, (71 to 80 in); yellowish brown (10YR 5/8) sandy clay loam; 15 percent light gray (10YR 7/2) interfingering of albic material; moderate medium prismatic structure parting to moderate fine and medium subangular blocky; very hard, very firm; few very fine roots; common very fine tubular pores; 2 percent distinct yellowish brown (10YR 5/8) clay films on faces of peds; 15 percent light gray (10YR 7/1) iron depletions with clear boundaries that is a clay depletion due to aquic conditions; 10 percent fine and medium distinct brownish yellow (10YR 6/6) iron concentrations with clear boundaries; 5 percent fine and medium red (2.5YR 4/6) plinthite; 2 percent fine and medium ironstone nodules; very strongly acid.

TYPE LOCATION: Jasper County, Texas; from the intersection of U. S. Highway 96 and Farm Road 1004 at Call Junction; 1.6 miles west on Farm Road 1004; 0.8 mile south on forest road to intersection; 300 feet east on forest trail; 150 feet north in forest. Latitude: 30 degrees, 34 minutes, 48 seconds N; Longitude: 93 degrees, 57 minutes, 10 seconds W; Call Junction topographic quad; NAD 83.

RANGE IN CHARACTERISTICS:

Soil Moisture: An udic soil moisture regime. The soil moisture control section is 10 to 30 cm (4 to 12 in) below the soil surface and remains dry less than 90 cumulative days in most years.

Mean annual soil temperature: 20.6 to 21.7 degrees C (69 to 71 degrees F)

Depth to glossic horizon: 28 to 56 cm (11 to 22 in)
Depth to episaturation: 41 to 99 cm (16 to 39 in)
Base saturation at taxonomic depth for the Ultisols order: 14 to 30 percent

Particle-size control section (weighted average)
Clay content: 18 to 25 percent
CEC to Clay: 0.25 to 0.35
Plinthite: 5 to 8 percent below 76 cm (30 in)

A Horizon
Hue: 10YR
Value: 4 to 6
Chroma: 2 or 3
Texture: fine sandy loam, very fine sandy loam, or loam
Clay content: 4 to 9 percent
Reaction: extremely acid to moderately acid

E Horizon (Some pedons have an EB with similar colors and textures)
Hue: 10YR
Value: 5 to 7
Chroma: 3 to 6
Texture: fine sandy loam, very fine sandy loam, loam
Clay content: 6 to 13 percent
Iron concentrations: amount-0 to 10 percent; color- shades of brown
Iron depletions: amount-0 to 2 percent; color- shades of gray
Reaction: extremely acid or moderately acid

Bt/E Horizon (where present)
Part: Bt
Hue: 7.5YR or 10YR
Value: 5 or 6
Chroma: 4 to 8
Part: E (15 to 25 percent of horizon)
Hue: 10YR
Value: 6 or 7
Chroma: 3 or 4
Texture: loam or sandy clay loam
Clay content: 16 to 25 percent
Iron concentrations: amount- 2 to 10 percent; color-shades of brown, red, or yellow
Iron depletions: amount-0 to 5 percent; color-gray;
Reaction: extremely acid to strongly acid

Btcv/E Horizon
Part: Bt
Hue: 7.5YR or 10YR
Value: 5 or 6
Chroma: 4 to 8
Part: E (15 to 25 percent of horizon)
Hue: 10YR
Value: 6 or 7
Chroma: 3 or 4
Texture: loam, sandy clay loam, or clay loam
Clay content: 21 to 25 percent
Iron concentrations: amount- 5 to 20 percent; color-shades of brown, red, or yellow
Iron depletions: amount-2 to 5 percent; color-shades of gray;
Plinthite: 3 to 8 percent
Reaction: extremely acid to strongly acid

Btv/Eg Horizon
Part: Btv
Hue: 7.5YR or 10YR
Value: 5 or 6
Chroma: 4 to 8
Part: E (15 to 25 percent of horizon)
Hue: 10YR
Value: 6 or 7
Chroma: 1 or 2
Texture: loam, sandy clay loam, clay loam
Clay content: 20 to 32 percent
Iron concentrations: amount-3 to 20 percent; color- shades of brown, red, or yellow
Iron depletions: amount-5 to 20 percent; color-shades of gray
Plinthite: 3 to 8 percent
Reaction: extremely acid to moderately acid

COMPETING SERIES: There are no series in the same family. Similar series are the Belrose (TX), Brule (LA), Dallardsville (TX), Kountze (TX), Meldrim (GA), Mountview (TN), Niwana (TX) Noboco (SC), and Stilson (GA) series

Belrose, Dallardsville, and Kountze soils: have less than 18 percent clay in the particle-size control section
Brule and Mountview soils: have less than 15 percent sands larger than very fine sand in the particle-size control section
Meldrim and Stilson soils: have a sandy epipedon and Stilson soils hare in a subactive CEC to clay class
Niwana soils: have less than 18 percent clay in the particle-size control section
Nobco soils: are in a subactive CEC to clay class

GEOGRAPHIC SETTING:
Parent material: loamy fluviomarine deposits of the Lissie Formation of early to mid-Pleistocene age.
Landscape: Coastal plain
Landform: interfluves
Slope: 0 to 2 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 generally uniform throughout the year with slight peaks in the spring and fall.
Frost-free period: 240 to 300 days
Elevation: 22.9 to 61 m (75 to 200 ft)
Thornthwaite annual P-E indices: 68 to 80

GEOGRAPHICALLY ASSOCIATED SOILS: These include the Dallardsville (TX), Jasco (TX), Kountze (TX), Niwana (TX), Otanya (TX), Sorter (TX), and Waller (TX) series.

Dallardsville soils have a coarse-loamy particle-size control section; on mounds.
Jasco soils: have a fragipan; in depressions
Kountze soils: have a coarse-loamy particle-size control section; on a similar landform
Niwana soils: have a coarse-loamy particle-size control section; are mounds in complex with Kirbyville soils
Otanya soils: are well drained; on a higher position on a similar landform
Sorter and Waller soils: are poorly drained; on relict meander belt channels.

DRAINAGE AND PERMEABILITY: moderately well to somewhat poorly drained. Permeability is moderate. Runoff is high. A perched water table is at 41 to 99 cm (16 to 39 in) during late winter and spring.

USE AND VEGETATION: Used mainly for timber production and wildlife habitat. Some areas have been cleared and are used for improved pasture. Native vegetation is loblolly and shortleaf pine with mixed hardwoods. The understory is dogwood, waxmyrtle, pinehill bluestem, and other grasses.

DISTRIBUTION AND EXTENT: Southeastern Texas and southwestern Louisiana; LRR T; The Western Gulf Coast Flatwoods (MLRA 152B); The series is of moderate extent.

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

SERIES ESTABLISHED: Jasper County, Texas 1980.

REMARKS: Kirbyville soils were formerly included with the Caddo and Thage soils. Classification and drainage class changed 12/97 based on data collected from typifying pedon in Hardin County, TX. Soil moisture monitoring indicates these soils to have saturation, for several weeks during January to March, with no reduction and qualify for a Oxyaquic subgroup. Typifying pedon redescribed 12/97. The classification was updated from Plinthic Paleudults to Oxyaquic Paleudults in May 1999 due to a change in soil taxonomy. Series description was updated in July 2011 as part of the update of MLRA 152B.

Diagnostic horizons and features recognized in this soil are:

Ochric epipedon--0 to 46 cm (0 to 18 in) (A and E horizon).

Argillic horizon--46 to 203 cm (18 to 80 in) (Bt/E, Btcv/E, Btv/Eg1, Btv/Eg2, Btv/Eg3 horizons).

Glossic horizon--46 to 203 cm (18 to 80 inch (Bt/E, Btcv/E, Btv/Eg1, Btv/Eg2, Btv/Eg3 horizons).

Saturated from 46 to 89 cm (16 to 39 in) for 30 or more cumulative days in normal years. (Bt/E horizon)

Plinthite--5 percent or more of some part of the argillic horizon.

ADDITIONAL DATA: Texas A&M University data from Hardin County, TX on pedon S96TX-199-001 and on pedon S00TX-457-003 from Tyler County, TX.
NSSL data on pedon number 07N0378 (S06TX-457-001) from Tyler County, TX.

Taxonomic version: Keys to Soil Taxonomy, Eleventh Edition, 2010.

---

National Cooperative Soil Survey
U.S.A.