LOCATION BARDEN             MO

BARDEN SERIES

TAXONOMIC CLASS: Fine, mixed, active, thermic Aquollic Hapludalfs

TYPICAL PEDON: Barden silt loam on a 2 percent slope in grassland at an elevation of 970 feet. (Colors are for moist soil unless otherwise stated.)

A--0 to 11 inches; very dark grayish brown (10YR 3/2) silt loam, grayish brown (10YR 5/2) dry; strong very fine and fine granular structure; very friable; many fine roots; common worm channels and casts; few fine iron-manganese concretions; strongly acid; gradual smooth boundary. (7 to 15 inches thick)

BE--11 to 18 inches; dark brown (10YR 4/3) silty clay loam; weak very fine subangular blocky structure; friable; common fine roots; many worm channels; few organic stains; few fine iron-manganese concretions; very strongly acid; gradual smooth boundary. (0 to 8 inches thick)

2Bt1--18 to 23 inches; yellowish brown (10YR 5/4) silty clay; many fine prominent red (2.5YR 4/8) and a few faint brown (10YR 5/3) mottles; moderate very fine subangular and angular blocky structure; firm; few fine roots; many faint clay films on faces of peds; few worm casts; common fine iron-manganese concretions; strongly acid; gradual smooth boundary.

2Bt2--23 to 30 inches; mottled yellowish brown (10YR 5/8), dark grayish brown (10YR 4/2), and red (2.5YR 4/8) silty clay; moderate fine and very fine subangular and angular blocky structure; firm; few fine roots; many distinct clay films on faces of peds; few worm casts; common fine iron-manganese concretions; strongly acid; gradual smooth boundary.

2Bt3--30 to 56 inches; mottled strong brown (7.5YR 5/6), yellowish brown (10YR 5/6), gray (10YR 5/1), and light brownish gray (10YR 6/2) silty clay loam; weak fine and very fine subangular blocky structure; firm; few faint clay films on faces of peds; common medium iron-manganese concretions increasing in amount in the lower 15 inches; strongly acid; gradual smooth boundary. (Combined thickness of the 2Bt horizon is 30 to 54 inches.)

2C--56 to 80 inches; yellowish brown (10YR 5/8) silty clay loam; few fine prominent pale brown (10YR 6/3) and light gray (10YR 7/2) mottles; massive; friable; many medium and coarse iron-manganese concretions; strongly acid.

TYPE LOCATION: Barton County, Missouri; about 11 miles west and 2 miles south of Lamar; 2,275 feet west and 520 feet north of the southeast corner of sec. 6, T. 31 N., R. 32 W.; USGS Nashville topographic quadrangle; lat. 37 degrees 27 minutes 48 seconds N. and long. 94 degrees 29 minutes 10 seconds W.

RANGE IN CHARACTERISTICS:

Depth to argillic horizon: 7 to 23 inches
Depth to redox concentrations: 18 to 24 inches
Depth to redox depletions: 30 to 36 inches
Depth to endosaturation: 24 to 36 inches from November to March
Base Saturation: less than 50 percent in some part of the argillic horizon

Particle-size control section (weighted average):
Clay content: 35 to 60 percent

A horizon:
Hue: 10YR
Value: 2 or 3, 4 or 5 dry
Chroma: 1 to 3
Texture: silt loam, loam, silty clay loam
Base saturation: 65 to 100 percent
Reaction: strongly acid to neutral

BE horizon:
Hue: 10YR
Value: 3 or 4
Chroma: 2 to 4
Other colors: may have mottles of higher chroma
Texture: silt loam, loam, silty clay loam
Clay content: 15 to 30 percent
Base saturation: 40 to 55 percent
Reaction: very strongly acid to neutral

Bt horizon:
Hue: 2.5YR to 10YR
Value: 4 to 6
Chroma: 3 to 8
Other colors: may be mottled with above colors and with colors with a chroma of 1 or 2
Redoximorphic features: none to common gray clay films and none to common iron-manganese concentrations
Texture: silty clay, silty clay loam, clay loam, or clay
Clay content: 29 to 60 percent
Gravel fragments: 0 to 6 percent
Base saturation: 40 to 85 percent
Reaction: neutral to very strongly acid

2Bt horizon (where present):
Hue: 10YR
Value: 4 to 6
Chroma: 3 to 8
Redoximorphic features: none to common gray clay films, none to common iron-manganese concentrations, and none to common soft masses of manganese
Texture: silty clay, silty clay loam, clay loam, or clay
Clay content: 29 to 60 percent
Rock fragments: 0 to 6 percent
Base saturation: 40 to 85 percent
Reaction: strongly acid to slightly acid

2Btg horizon (where present):
Hue: 10YR
Value: 5 to 6
Chroma: 2
Redoximorphic features: none to common iron-manganese concentrations, none to common soft masses of manganese, and none to common masses of iron accumulation
Texture: silty clay, silty clay loam, clay loam, or clay
Clay content: 29 to 60 percent
Gravel fragments: 0 to 6 percent
Base saturation: 40 to 85 percent
Reaction: strongly acid to slightly acid

2C horizon:
Mottled in the colors:
Hue: 10YR
Value: 4 to 7
Chroma: 1 to 8
Redoximorphic features: common to many iron-manganese concentrations, common masses of iron accumulation
Texture: silty clay loam, clay loam, or sandy clay loam
Reaction: slightly acid to very strongly acid

COMPETING SERIES: These are the Liberal and Moyers series.
Liberal: are 40 to 60 inches to shale bedrock
Moyers: are 40 to 60 inches to shale bedrock.

GEOGRAPHIC SETTING:
Parent materials: mantle of loess or other silty material and residuum from shale
Landscape: uplands
Landform: ridges and side slopes
Slopes: 0 to 5 percent
Mean annual temperature: 59 to 62 degrees F
Mean annual precipitation: 37 to 42 inches

GEOGRAPHICALLY ASSOCIATED SOILS:
Barco soils are moderately deep and have less clay and occur on the ridgetop.
Coweta soils are shallow to bedrock and occur on smooth upland ridges.
Deepwater soils are in the fine-silty particle size family and occur on upland ridges.
Hartwell soils have an abrupt textural boundary and occur on similar positions.
Medoc soils have an abrupt textural boundary and are somewhat poorly drained occuring on smooth plains.
Opolis soils have an abrupt textural boundary and occur on smooth plains.
Parsons soils have an abrupt textural boundary and occur on upland plains.
Sylvania soils are deep and have lower base saturation in the argillic.
Zaar soils do not have an argillic horizon.

DRAINAGE AND PERMEABILITY:
Drainage: moderately well
Runoff: medium
Permeability: slow

USE AND VEGETATION: These soils are used for cultivated crops or hay and pasture. Native vegetation is tall grasses.

DISTRIBUTION AND EXTENT: The Ozark Border area (MLRA 116B) and Cherokee Prairie area (MLRA 112) of southhwest and westcentral Missouri. The soils are of large extent.

MLRA OFFICE RESPONSIBLE: Salina, Kansas

SERIES ESTABLISHED: Barton County, Missouri, 1969.

REMARKS:
Diagnostic horizons and features recognized in this pedon are:

Particle-size control section: The zone from 18 to 38 inches.
Mollic epipedon: The zone from 0 to 11 inches. (A horizons)
Argillic horizon: The zone from 18 to 56 inches. (Bt1, Bt2, and Bt3 horizons)
Lithologic discontinuity: At the upper boundary of the 2Bt horizon.

The soil is not a mollisol because of base saturation in the argillic horizon is less than 50 percent. The original description did not include a lithologic discontinuity between the loess and shale. This has been updated to reflect the discontinuity. There is a potential of several lithological discontinuities.

The assignment of the cation-exchange activity class is inferred from lab data from similar soils in the surrounding area.

Taxonomic Version: Keys to Soil Taxonomy, Eighth Edition, 1998

7/19/01 - PRF- moved to a semi tab format. Included the discontinuity, added new series as associated soils

ADDITIONAL DATA: