Nebraska Soils Field Trip - Virginia Tech

4th IUSS Soil Classification Conference Field Tour Guidebook
depletions; few fine distinct yellowish brown (10YR 5/6) redoximorphic concentrations; slightly
acid; gradual smooth boundary. (15 to 50 centimeters thick)
C--132 to 152 centimeters; brown (10YR 4/3) silty clay loam; massive; friable; few fine dark
oxides; few fine faint grayish brown (10YR 5/2) redoximorphic depletions; common fine distinct
yellowish brown (10YR 5/6) redoximorphic concentrations; slightly acid.
TYPE LOCATION: Major Land Resource Area (MLRA) 108D-Illinois and Iowa Deep Loess
and Drift, Western Part, Madison County, Iowa subset; about 7 miles north and 3 miles east of
Winterset; located about 2,000 feet south and 300 feet west of the northeast corner of section 33,
T. 77 N., R. 27 W.; USGS Saint Charles NW topographic quadrangle; lat. 41 degrees 25 minutes
34 seconds N. and long. 93 degrees 57 minutes 22 seconds W., NAD 83.
RANGE IN CHARACTERISTICS:
Thickness of the mollic epipedon--80 to 150 centimeters
Depth to carbonates--more than 150 centimeters
Clay content in the particle-size control section (weighted average)--30 to 35 percent
Sand content in the particle-size control section (weighted average)--1 to 10 percent fine sand
and sand coarser than fine sand
Ap or A horizon:
Hue--10YR
Value--2 or 3
Chroma--1 or 2
Texture--silty clay loam or silt loam
Clay content--24 to 32 percent
Sand content--1 to 10 percent
Reaction--very strongly acid to neutral
AB horizon:
Hue--10YR
Value--2 or 3
Chroma--2
Texture--silty clay loam
Clay content--27 to 32 percent
Sand content--1 to 10 percent
Reaction--moderately acid to neutral
Bt or Bw horizon:
Hue--10YR
Value--3 to 5
Chroma--3 to 5
Texture--silty clay loam
Clay content--30 to 35 percent
Sand content--1 to 10 percent
Reaction--moderately acid to neutral
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