LOCATION NAVAN WI
The Navan series consists of very deep, poorly drained soils formed in loamy outwash and in stratified mostly clayey and silty stratified lacustrine deposits on glacial lake basins and low stream terraces. Slope ranges from 0 to 3 percent. Mean annual precipitation is about 762 mm (30 inches). Mean annual air temperature is about 8.9 degrees C (48 degrees F).
TAXONOMIC CLASS: Fine-loamy, mixed, superactive, mesic Typic Argiaquolls
TYPICAL PEDON: Navan silt loam - on a slope of less than 1 percent in a cultivated field at an elevation of about 247 meters (810 feet) above mean sea level. (Colors are for moist soil unless otherwise stated.)
Ap--0 to 25 cm (0 to 10 inches); black (N 2.5/0) silt loam, dark gray (N 4/0) dry; weak fine subangular blocky structure; very friable; high organic matter content; slightly alkaline; abrupt smooth boundary.
A--25 to 31 cm (10 to 12 inches); black (10YR 2/1) clay loam, dark grayish brown (10YR 4/2) dry; weak fine subangular blocky structure; firm; few fine distinct dark grayish brown (2.5Y 4/2) masses of iron accumulation; slightly alkaline; abrupt smooth boundary. [Combined thickness of the Ap and A horizons ranges from 25 to 51 cm (10 to 20 inches).]
Btg1--31 to 43 cm (12 to 17 inches); dark grayish brown (2.5Y 4/2) clay loam; moderate fine and very fine subangular blocky structure; firm; thin clay films on faces of some peds and in pores and channels; distinct black (10YR 2/1) soil material from the horizon above, filling some channels; many fine distinct light olive brown (2.5Y 5/4) masses of oxidized iron in the matrix; common medium distinct dark gray (10YR 4/1) iron depletions in the matrix; slightly alkaline; clear wavy boundary.
Btg2--43 to 74 cm (17 to 29 inches); olive gray (5Y 5/2) clay loam; moderate fine subangular blocky structure; firm; thin clay films on faces of some peds and in pores and channels; common fine and medium prominent yellowish brown (10YR 5/6) masses of oxidized iron in the matrix; slightly alkaline; clear smooth boundary. [Combined thickness of the Btg horizons ranges from 20 to 66 cm (8 to 26 inches).]
2BCg--74 to 94 cm (29 to 37 inches); light olive gray (5Y 6/2) silty clay loam; moderate medium and fine prismatic structure; firm; many medium prominent yellowish brown (10YR 5/6) masses of oxidized iron in the matrix; strongly effervescent; moderately alkaline. [0 to 25 cm (0 to 10 inches) thick].
2Cg--94 to 152 cm (37 to 60 inches); mixed gray (5Y 5/1), yellowish brown (10YR 5/6), and greenish gray (5GY 6/1) silty clay loam with thin strata of silt loam and silty clay; massive; tends to break to weak thick plates along depositional cleavage planes; firm; strongly effervescent; moderately alkaline.
TYPE LOCATION: Rock County, Wisconsin, 1150 feet south and 130 feet east of the northwest corner of sec. 6, T. 2 N., R. 10 E. USGS Orfordville, Wisconsin Topographic quadrangle; lat. 42 degrees 40 minutes 08 seconds N., and long. 89 degrees 22 minutes 01 seconds W., NAD 27.
RANGE IN CHARACTERISTICS:
Depth to base of soil development: 51 to 107 cm (20 to 42 inches)
Thickness of the mollic epipedon: 25 to 51 cm (10 to 20 inches)
Depth to carbonates: 51 to 102 cm (20 to 40 inches)
Thickness of the loamy outwash mantle: 46 to 91 cm (18 to 36 inches)
Depth to stratified lacustrine deposits: 46 to 91 cm (18 to 36 inches)
Particle-size control section: averages 24 to 35 percent clay, 16 to 50 percent fine sand or coarser
Volume of rock fragmenta in the loamy outwash mantle: 0 to 20 percent
Reaction: slightly acid to slightly alkaline in the upper part of the soil; slightly alkaline or moderately alkaline in the lower part
Special features: Distinct or prominent redox accumulations are in the lower part of the mollic epipedon in many pedons and are throughout the soil below the mollic epipedon. Dominant chroma of 2 or less (or 1 or less depending on hue) is directly below the mollic epipedon.
Saturation: 0 to 31 cm (0 to 1 foot) for long periods in most years
Ap or A horizon:
Hue: 10YR or N
Value: 2 or 3
Chroma: 0 to 2
Texture: silt loam, loam or clay loam
Hue: 10YR, 2.5Y or 5Y
Value: 4 to 6
Cchroma: 1 or 2
Texture: loam, clay loam, or sandy clay loam.
Hue: 7.5YR, 10YR, 2.5Y or 5Y but hue ranges to 5G in some pedons
Value: 4 to 6
Chroma: 1 to 6
Texture: silty clay loam, but some pedons have thin strata of finer or coarser textures;
Hue: 7.5YR, 10YR, 2.5Y or 5Y but hue ranges to 5G in some pedons.
Value: 4 to 6
Chroma: 0 to 6
Texture: silty clay loam with thin strata of finer or coarser textures.
Clay content averages more than 25 percent and total sand content ranges from 15 to 40 percent.
COMPETING SERIES: These are the
Westland series. Barry, Brookston, Clackamas, Cordova, Jameston, and Navunon soils do not have fine stratification in the lower part of the series control section and have coarse fragments there. In addition, Brookston soils are more than 102 cm (40 inches) deep to carbonates; Clackamas soils do not have carbonates within the series control section; and Navunon soils typically have a lithic contact within 152 cm (60 inches). Forestcity soils average less than 28 percent clay in the lower 1/3 of the series control section. Hamel, and Nosoni soils have mollic epipedons more than 61 cm (24 inches) thick. Millgrove and Rensselaer soils have less than 20 percent clay in the lower part of the series control section. Radioville soils are more than 102 cm (40 inches) deep to stratified lacustrine deposits. Tallmadge soils have a lithic contact at 102 to 152 cm (40 to 60 inches). Westland soils have 85 to 90 percent sand in the lower part of the series control section.
GEOGRAPHIC SETTING: The Navan soils are on glacial lake basins and low stream benches. Slope ranges from 0 to 3 percent. These soils formed in a mantle of loamy outwash and in the underlying mostly clayey and silty stratified lacustrine deposits. Mean annual precipitation ranges from 660 to 889 mm (26 to 35 inches). Mean annual air temperature ranges from 7.8 to 11.7 degrees C (46 to 53 degrees F).
GEOGRAPHICALLY ASSOCIATED SOILS: These are the
Poy soils. The moderately well drained Hebron and the somewhat poorly drained Aztalan and Mosel soils form a drainage sequence with the Navan soils. These soils are adjacent to and higher lying than the Navan soils. Aztalan soils have mollic epipedons and Mosel soils do not have mollic epipedons. Colwood soils formed in stratified silt and sand while Poy soils have finer textured horizons in the upper part of the solum. Poy and Colwood soils occupy a similar setting as the Navan soils.
DRAINAGE AND SATURATED HYDRAULIC CONDUCTIVITY: Poorly drained. The potential for surface runoff is low. Saturated hydraulic conductivity is moderately high to high (4.23 to 14.11 micrometers per second) and moderately high (1.41 to 4.23 micrometers per second) in the lacustrine deposits. Permeability is moderate in the loamy outwash mantle and moderately slow in the lacustrine deposits. In some places these soils are subject to common flooding. These soil have an apparent seasonal high water table at a depth of 0 to 31 cm (0 to 1 foot) for long periods in most years.
USE AND VEGETATION: Most areas are drained and are used for cropland. Common crops are corn, oats and hay. Other areas have been retained primarily in pasture. Native vegetation is marsh grasses and a few trees.
DISTRIBUTION AND EXTENT: MLRAs 95A, 95B, and 110 in eastern Wisconsin. The Navan soils are of moderate extent.
MLRA SOIL SURVEY REGIONAL OFFICE (MO) RESPONSIBLE: Indianapolis, Indiana
SERIES ESTABLISHED: Green County, Wisconsin, 1969.
7/04 This revision redefines the series concept to include only those soils formed in a loamy outwash mantle and the underlying stratified silty and clayey lacustrine deposits. A new typical pedon is used to better reflect this concept. Soils correlated as Navan that formed in loamy outwash and underlying clayey glacial till are excluded. This includes at least some of the acres in the Kenosha-Racine, Ozaukee, and Winnebago soil surveys and possibly some areas in other surveys. These areas should be correlated to another (new?) series when the surveys are updated.
Diagnostic horizons and features recognized in this pedon are: mollic epipedon - 0 to 31 cm (0 to 12 inches) (Ap, A); argillic horizon - 31 to 74 cm (12 to 29 inches) (Btg1, Btg2) aquic feature - saturaton and redox accumulations in the lower part of the mollic epipedon.
National Cooperative Soil Survey