LOCATION BUNA TX

Tentative Series
JKW-CLN-RM
07/2014

BUNA SERIES

The Buna series consists of very deep, well drained soils. These gently sloping soils formed in loamy alluvium of Holocene age. Slope ranges from 3 to 8 percent. Mean annual temperature is about 19.5 degrees C. (67 degrees F.), and mean annual precipitation is about 1473 mm (58 in).

TAXONOMIC CLASS: Fine, mixed, active, thermic Vertic Hapludults

TYPICAL PEDON: Buna very fine sandy loam--woodland; elevation is 22.9 m (75 ft) (Colors are for moist soil unless otherwise stated.)

Ap--0 to 12 cm, (0 to 5 in); dark grayish brown (10YR 4/2) very fine sandy loam; weak fine granular structure; very friable, soft; many fine roots; common medium roots; many very fine roots; many medium iand coarse interstitial pores; strongly acid; clear smooth boundary. (8 to 15 cm [3 to 6 in] thick)

Ep--12 to 25 cm, (5 to 10 in); brown (7.5YR 5/4) fine sandy loam; weak fine and medium granular structure; very friable, soft; common fine roots; common medium roots; common coarse roots; many very fine roots; many very fine and fine tubular pores; 1 percent medium yellowish brown (10YR 5/8) ironstone nodules; strongly acid; abrupt wavy boundary (8 to 20 cm [3 to 8 in])

Bt1--25 to 63 cm, (10 to 25 in); red (2.5YR 4/6) clay; weak medium prismatic structure parting to moderate medium subangular blocky; very firm, very hard; common fine to coarse roots; many very fine roots; many fine tubular and common very fine tubular pores; 30 percent distinct pressure faces on all faces of peds; 30 percent distinct red (2.5YR 4/6) clay films on all faces of peds; very strongly acid; gradual wavy boundary. (combined thickness of the Bt horizons is 170 to 185 cm [67 to 73 in])

Bt2--63 to 93 cm, (25 to 37 in); reddish brown (2.5YR 4/4) clay; moderate medium subangular blocky structure; very firm, very hard; many very fine and common fine roots; common very fine and fine tubular pores; 15 percent distinct pressure faces on all faces of peds; 30 percent distinct red (2.5YR 4/6) clay films on all faces of peds; 30 percent fine and medium prominent brownish yellow (10YR 6/6) masses of oxidized iron with sharp boundaries infused into matrix along faces of peds; very strongly acid; clear wavy boundary

Bt3--93 to 112 cm, (37 to 44 in); reddish brown (2.5YR 4/4) clay loam, reddish brown (2.5YR 5/4), dry; weak coarse subangular blocky structure; firm, very hard; common very fine and fine roots; common very fine and fine tubular pores; 30 percent distinct reddish brown (2.5YR4 /4) clay films on all faces of peds; 20 percent medium and coarse prominent brownish yellow (10YR 6/6) masses of oxidized iron with sharp boundaries between peds; 30 percent medium and coarse prominent gray (10YR 6/1) iron depletions with sharp boundaries on faces of peds; very strongly acid; clear wavy boundary.

Bt4--112 to 161 cm, (44 to 63 in); brownish yellow (10YR 6/6) loam; weak coarse subangular blocky structure; firm, hard; common very fine and fine roots; common very fine and fine tubular pores; 25 percent distinct brownish yellow (10YR 6/6) clay films on all faces of peds; 5 percent coarse prominent red (2.5YR 4/6) masses of oxidized iron with sharp boundaries between peds; 30 percent coarse prominent gray (10YR 6/1) iron depletions with sharp boundaries on faces of peds; 10 percent by volume of light gray (10YR 7/1) albic tongues; very strongly acid; clear irregular boundary. (Combined thickness of the Bt horizons is 90 to 173 cm (36 to 68 in.)

Btg--161 to 203 cm, (63 to 80 in); light gray (10YR 7/1) loam; weak very coarse subangular blocky structure; friable, slightly hard; common very fine roots; common very fine and fine tubular pores; 30 percent distinct light gray (10YR 7/1) clay films on all faces of peds; 1 percent medium prominent yellowish brown (10YR 5/8) masses of oxidized iron with sharp boundaries in matrix; 10 percent medium prominent yellowish brown (10YR 5/6) masses of oxidized iron with sharp boundaries in matrix; 15 percent coarse prominent brown (7.5YR 4/3) masses of oxidized iron with sharp boundaries in matrix; 5 percent by volume of light gray (10YR 7/1) albic tongues; extremely acid.

TYPE LOCATION: Newton County, Texas; from the intersection of Texas Highway 82 and Texas Highway 1004 in Trout Creek; 0.9 mile northwest on Texas Highway 82 to entrance to E.O. Siecke State Forest; 0.2 mile north on State Forest road; located about 50 feet west in forest; Latitude: 30 degrees, 37 minutes, 36.5 seconds N; Longitude: 93 degrees, 49 minutes, 28.5 seconds W. Trout Creek USGS topographic quadrangle; 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. These soils are moist throughout most of the year with dry periods for less than 90 cumulative days in normal years.
Mean annual soil temperature: 20.6 to 21.7 degrees C. (69 to 71 degrees F).
Depth to abrupt textural change and argillic horizo: 11 to 35 cm (6 to 18 in)

Particle-size control section (weighted average)
Clay content: 45 to 55 percent

Ap Horizon
Hue: 10YR
Value: 4 or 5
Chroma: 2 or 3
Texture: fine sandy loam, very fine sandy loam, or loam
Reaction: very strongly acid or moderately acid

Ep Horizon
Hue: 7.5YR or 10YR
Value: 5 or 6
Chroma: 2 to 4
Texture: fine sandy loam, very fine sandy loam, or loam
Masses of oxidized iron: amount- 0 to 2 percent, color-shades of brown,
Iron depletions: amount-0 to 1 percent, color-shades of gray
Reaction: very strongly acid or moderately acid

Bt Horizon
(upper part)
Hue: 10R to 5YR
Value: 4 to 6
Chroma: 4 to 6
Texture: clay loam and clay
Clay content: 35 to 60 percent
Masses of oxidized iron: amount- 0 to 10 percent, color-shades of brown or yellow
Iron depletions: amount-2 to 20 percent, color-shades of gray
Reaction: very strongly acid to moderately acid

Bt Horizon
(lower part)
Hue: 5YR to 10YR
Value: 4 to 7
Chroma: 4 to 6
Texture: loam, sandy clay loam or clay loam
Clay content: 20 to 35 percent
Masses of oxidized iron: amount- 5 to 20 percent, color-shades of brown, yellow, or red
Iron depletions: amount-2 to 20 percent, color-shades of gray
Reaction: extremely acid or strongly acid

Btg Horizon (where present)
Hue: 10YR or 2.5Y
Value: 5 to 7
Chroma: 1 to 3
Texture: loam or clay loam
Clay content: 15 to 30 percent
Masses of oxidized iron: amount- 2 to 10 percent, color-shades of brown, yellow, or red
Iron depletions: amount-0 to 25 percent, color-shades of gray or blue
Reaction: extremely acid or very strongly acid

COMPETING SERIES: These are no series in the same family. Similar soils include the Bonwier (TX), Cuthbert (TX), Galilee (TX), Kirvin and Spurger (TX) series.

Bonwier soils: deep over stratified clay and sandstone; do not have vertic properties
Cuthbert soils: formed in weakly consolidated sandstone and shale; do not have vertic properties
Galilee soils: deep over weakly cemented sandstone; do not have vertic properties
Kirvin soils: have a densic layer; do not have vertic properties
Spurger soils: have aquic conditions; are moderately well drained; have more than 35 percent base saturation

GEOGRAPHIC SETTING:
Parent material: loamy alluvium of Holocene age
Landscape: river valley on the coastal plain
Landform: terrace riser
Slope: 3 to 8 percent
Mean annual air temperature range: 19.5 to 20.6 degrees C (67 to 69 degrees F)
Mean annual precipitation range: 1321 mm to 1524 mm (52 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: 7.6 to 32 m (25 to 105 ft)
Thornthwaite annual P-E indices: 78 to 82

GEOGRAPHICALLY ASSOCIATED SOILS: These are the Angelina (TX), Belrose (TX), Estes (TX), Evadale (TX), Spurger (TX), and Texla(TX) soils.
Angelina soils: are loamy and gray throughout; on flood plains
Belrose soils: are loamy throughout; on terrace treads
Estes soils: are clayey throughout; on floodplains
Evadale soils: are gray throughout; on coastal plain flats
Spurger soils: have gray masses of iron accumulations in the upper part of the argillic horizon; on a similar landform but have slopes less than 3 percent.
Texla soils: have a yellower argillic horizon; on oblong mounds and relict point bars on the coastal plain.

DRAINAGE AND PERMEABILITY: Well drained. Permeability is slow. Runoff is very high.

USE AND VEGETATION: Used mainly for timber. Some areas are in pasture of improved bermudagrass or bahiagrass. Loblloy and shotleaf pine are dominant woodland trees with many oak species and other hardwoods.

DISTRIBUTION AND EXTENT: Southeastern Texas; LRR T; MLRA 152B; small extent

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

SERIES PROPOSED: Newton County, Texas, 2011, MLRA 152B soil survey area. The name is for a town in Jasper County, Texas.

REMARKS: The series was established during the update of MLRA 152B. These soils were previously mapped as the Spurger series but do not classify the same as Spurger.

Diagnostic horizons and features recognized in this pedon are:
Particle size control section: 33 to 83 cm (13 to 33 in). (Bt1 and Bt2 horizons)

Ochric epipedon: 0 to 33 cm (0 to 13 in). (A and E horizons)

Argillic horizon: 33 to 203 cm (13 to 80 in). (Bt1, Bt2, Bt3, Bt4, and Btg horizons)

Vertic features: The presence of pressure faces at 33 to 117 cm (13 to 46 in) (Bt1, Bt2, and Bt3 horizons)

ADDITIONAL DATA: NSSL data on pedon number 08N0165 from the series type location. Addition laboratory data from the MLRA 150 Soil Survey Office on three other sites.

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

National Cooperative Soil Survey
U.S.A.