LOCATION ARNHEIM MI+WIEstablished Series
TAXONOMIC CLASS: Coarse-loamy, mixed, superactive, nonacid, frigid Typic Fluvaquents
TYPICAL PEDON: Arnheim mucky silt loam on a level flood plain under mixed lowland hardwoods and conifers. (Colors are for moist soil unless otherwise stated.)
A--0 to 13 centimeters; dark brown (7.5YR 3/2) mucky silt loam, dark grayish brown (10YR 4/2) dry; moderate medium granular structure; friable; many fine and medium roots; moderately acid; clear smooth boundary. (2 to 13 centimeters thick)
Cg--13 to 25 centimeters; dark grayish brown (10YR 4/2) silt loam; many coarse distinct strong brown (7.5YR 5/6) masses of iron accumulation; moderate medium subangular blocky structure; friable; many fine and medium roots; moderately acid; clear smooth boundary. (10 to 51 centimeters thick)
C1--25 to 38 centimeters; reddish brown (5YR 4/3) very fine sandy loam; many coarse distinct strong brown (7.5YR 5/6) masses of iron accumulation; massive; firm; common fine roots; moderately acid; abrupt smooth boundary. (0 to 15 centimeters thick)
C2--38 to 61 centimeters; reddish brown (5YR 4/3) silt loam; common medium distinct yellowish red (5YR 5/6) masses of iron accumulation; massive; firm; few medium roots; moderately acid; abrupt smooth boundary. (0 to 38 centimeters thick)
C3--61 to 152 centimeters; reddish brown (5YR 4/3) stratified loamy fine sand, very fine sandy loam, and fine sandy loam; massive; friable; strongly acid.
TYPE LOCATION: Baraga County, Michigan; about 1 1/2 miles north and 3 miles east of Pelkie; 2,000 feet west and 125 feet north of the southeast corner of sec. 2, T. 51 N., R. 34 W.
RANGE IN CHARACTERISTICS: The soil typically is strongly acid to neutral. Color, arrangement, and thickness of horizons vary considerably because of the nature of the parent materials.
The A horizon has hue of 5YR to 10YR, value of 3 or 4, and chroma of 1 to 4. It is typically mucky silt loam, but the range includes silt loam, very fine sandy loam, and loamy very fine sand.
The Cg horizon has hue of 10YR, 2.5Y, or 5Y; value of 4 to 6; and chroma of 1 or 2. It is silt loam or very fine sandy loam. The remaining C horizons typically have 5YR hue but include individual horizons of 7.5YR or 10YR hue, value of 3 to 5, and chroma of 2 to 6. Textures within the control section are variable in their order of occurrence but commonly are silt loam, very fine sandy loam, and loamy very fine sand. Thin individual horizons of fine sand, loamy sand, loamy fine sand, or fine sandy loam occur but the control section averages between 8 and 18 percent clay and has greater than 15 percent fine sand or coarser. Below a depth of 102 centimeters, thin layers of silty clay loam, loamy sand, or sand occur along with the textures listed in the control section.
COMPETING SERIES: This is the Pengilly series. Pengilly soils have hues more yellow than 7.5YR and generally are less acid.
GEOGRAPHIC SETTING: Arnheim soils are on flood plains of major streams. The topography is level or nearly level with slope gradients from 0 to 1 percent. The soils formed in loamy alluvium. Mean annual precipitation ranges from about 710 to 890 millimeters, and mean annual temperature ranges from 4 to 7 degrees C.
GEOGRAPHICALLY ASSOCIATED SOILS: These are the somewhat poorly drained Sturgeon and Winterfield soils, and the moderately well drained Pelkie and Moquah soils on similar landscapes.
DRAINAGE AND SATURATED HYDRAULIC CONDUCTIVITY: Poorly drained. Runoff is negligible to low. Saturated hydraulic conductivity is moderately high and high. Representative wet soil moisture status ranges from the surface to 76 centimeters below the surface at times throughout the year. Flooding is occasional to frequent for brief to long periods in March to November.
USE AND VEGETATION: Nearly all of this soil is in forest of mixed lowland hardwoods and conifers.
DISTRIBUTION AND EXTENT: Upper Peninsula of Michigan and northwest Wisconsin. The series is of small extent.
MLRA SOIL SURVEY REGIONAL OFFICE (MO) RESPONSIBLE: St. Paul, Minnesota
SERIES ESTABLISHED: Baraga County, Michigan, 1984.
REMARKS: The previous draft of the series had the classification as coarse-loamy, mixed, nonacid, frigid Aeric Fluvaquents. Because of red parent material that remains red after citrate-dithionite extraction, the requirement for low chroma should be waived.