Nebraska Soils Field Trip - Virginia Tech

4th IUSS Soil Classification Conference Field Tour Guidebook
LOCATION MONONA IA+KS MO NE
Established Series
Rev. FFR-RAL-TWN
07/2004
MONONA SERIES
The Monona series consists of very deep, well drained soils formed in loess. These soils are on
interfluves and side slopes on dissected till plains and risers and treads on loess covered stream
terraces. Slopes range from 0 to 40 percent. Mean annual air temperature is about 10 degrees C
(51 degrees F). Mean annual precipitation is about 71 centimeters (29 inches).
TAXONOMIC CLASS: Fine-silty, mixed, superactive, mesic Typic Hapludolls
TYPICAL PEDON: Monona silt loam, on a slope of 1 percent, in a cultivated field, at an
elevation of 418 meters (1,370 feet) above sea level. (Colors are for moist soil unless otherwise
stated.)
Ap--0 to 18 centimeters (0 to 7 inches); very dark brown (10YR 2/2) silt loam, very dark grayish
brown (10YR 3/2) dry; weak fine subangular blocky structure parting to weak fine granular;
friable; few very fine pores; slightly acid; clear smooth boundary.
A--18 to 38 centimeters (7 to 15 inches); very dark brown (10YR 2/2) and dark brown (10YR
3/3) silt loam, brown (10YR 5/3) dry; weak very fine subangular blocky structure parting to
weak very fine granular; friable; few very fine pores; slightly acid; clear smooth boundary.
[Combined thickness of the A horizon is 25 to 61 centimeters (10 to 24 inches).]
Bw1--38 to 53 centimeters (15 to 21 inches); brown (10YR 4/3) silt loam; weak fine subangular
blocky structure; friable; common very fine pores; neutral; gradual smooth boundary.
Bw2--53 to 76 centimeters (21 to 30 inches); brown (10YR 4/3) silt loam; weak fine subangular
blocky structure; friable; many very fine pores; few very fine dark concretions (oxides); neutral;
gradual smooth boundary. [Combined thickness of the Bw horizon is 30 to 114 centimeters (12
to 45 inches).]
C--76 to 152 centimeters (30 to 60 inches); brown (10YR 4/3) silt loam; massive; very friable;
few very fine pores; many very fine dark concretions (oxides); common very fine distinct brown
(7.5YR 4/4) relict redoximorphic concentrations; few fine distinct grayish brown (2.5Y 5/2)
relict redoximorphic depletions; neutral grading with depth to slightly alkaline.
TYPE LOCATION: Major Land Resource Area (MLRA) 107; Harrison County, Iowa; about 7
miles east of Woodbine; about 67 meters (220 feet) north and 318 meters (1,044 feet) east of
southwest corner of section 13, T. 80 N., R. 41 W.; USGS Portsmouth quadrangle; lat. 41
degrees 43 minutes 59 seconds N. and long. 95 degrees 34 minutes 22 seconds W., NAD 83.
95