LOCATION NAMUR WIEstablished Series
TAXONOMIC CLASS: Loamy, mixed, active, frigid Lithic Hapludolls
TYPICAL PEDON: Namur silt loam - on a 4 percent slope in a pasture at an elevation of about 700 feet. (Colors are for moist soil unless otherwise stated.)
A--0 to 6 inches; very dark brown (10YR 2/2) silt loam, grayish brown (10YR 5/2) dry; weak medium subangular blocky structure parting to moderate fine subangular blocky; friable; many fine and medium roots; many very fine and fine and common medium tubular pores; few dolostone rock fragments mostly less than 1 inch in diameter but ranging to 4 inches; neutral; clear wavy boundary. (4 to 10 inches thick)
R--6 inches; dolostone; thinly bedded (1/2 to 2 inches) in upper 3 inches; few, narrow, widely spaced crevasses filled with silty clay loam and clay residuum occupy less than 5 percent of the horizon.
TYPE LOCATION: Brown County, Wisconsin; about 0.5 miles south and 1 mile west of Dyckesville; 2000 feet west and 250 feet north of the southeast corner of sec. 14, T. 25 N., R. 22 E.; USGS Dyckesville, Wis. Quad.; Latitude 44 degrees 38 minutes 0 seconds N. Longitude 87 degrees 47 minutes 28 seconds W. NAD 27.
RANGE IN CHARACTERISTICS: Thickness of the mollic epipedon and depth to bedrock ranges from 4 to 10 inches. Volume of dolostone channers ranges from 3 to 35 percent. Reaction ranges from slightly acid to moderately alkaline. Carbonates are in the loamy mantle in some pedons.
The A horizon has hue of 5YR, 7.5YR or 10YR; value of 2 or 3; and chroma of 1 to 3. Texture is silt loam, loam, or the channery analogs.
Some pedons have a thin Bw horizon with hue of 7.5YR or 10YR and value and chroma of 4 or 5. Texture is silt loam, loam, or the channery analogs.
The R horizon is dolostone and is either massive or bedded. Typically it is interrupted at intervals along its surface by thin, vertical weathered cracks or joints. Cracks are more than 4 inches apart and commonly are 2 to 10 feet apart. These cracks are filled with soil (residuum, loess, or till) but occupy less than 5 percent of the volume.
COMPETING SERIES: These are no competing series.
GEOGRAPHIC SETTING: Namur soils are on glaciated karst uplands underlain by dolostone. Slopes range from 0 to 20 percent. These soils formed in a very thin silty or loamy mantle over the bedrock. Mean annual precipitation ranges from 28 to 33 inches. Mean annual air temperature ranges from 39 to 45 degrees F. The frost-free period ranges from about 80 to 150 days. Elevation ranges from 600 to 1400 feet.
GEOGRAPHICALLY ASSOCIATED SOILS: Namur soils are associated with the Kolberg, Ruse, and Summerville soils. The well drained Kolberg soils are nearby where the soil has more clay and is moderately deep to dolostone. The poorly drained and very poorly drained Ruse soils are nearby in depressions where the soil is 10 to 20 inches thick to dolomite. The well drained Summerville soils are nearby in landscape positions similar to those of Namur soils where the soil is 10 to 20 inches thick to dolostone.
DRAINAGE AND PERMEABILITY: Excessively drained. The potential for surface runoff ranges from negligible to medium. Permeability is moderate in the silty or loamy mantle and slow to rapid in the dolostone, depending on fracturing.
USE AND VEGETATION: Most areas of this soil are used for pastureland. Some areas are used for cropland or orchards. Where orchards are grown, the soil's effective depth often has been increased by blasting to a depth of several feet. Native vegetation is sparse deciduous and coniferous forest with grassy understory.
DISTRIBUTION AND EXTENT: Northeastern Wisconsin. The series is of moderate extent.
MLRA OFFICE RESPONSIBLE: Indianapolis, Indiana.
SERIES ESTABLISHED: Brown County, Wisconsin, 1970.
REMARKS: Diagnostic horizons and features recognized in this pedon are: mollic epipedon - 0 to 6 inches (A); lithic contact at 6 inches (R).
Of the 25,698 acres correlated, a total of about 4000 acres correlated in Kewaunee, Brown and Outagamie counties are south of the mesic/frigid line.