LOCATION SHANDEP IA+MNEstablished Series
TAXONOMIC CLASS: Fine-loamy, mixed, superactive, mesic Cumulic Endoaquolls
TYPICAL PEDON: Shandep loam - in a depression in a pasture of native prairie grasses. (Colors are for moist soil unless otherwise stated.)
A--0 to 5 inches; black (N 2/0) loam; moderate fine granular structure; friable; few pebbles; slightly acid; gradual smooth boundary.
A2--5 to 25 inches; black (N 2/0) clay loam; moderate fine granular structure; friable; few pebbles; slightly acid; gradual smooth boundary.
A3--25 to 29 inches; black (5Y 2/1) and very dark gray (5Y 3/1) clay loam; weak medium granular structure; friable; few pebbles; slightly acid; clear wavy boundary. (Combined thickness of the A horizon is 24 to 36 inches.)
Bg1--29 to 37 inches; dark gray (5Y 4/1) clay loam; weak fine and medium subangular blocky structure; friable; few pebbles; slightly acid; gradual wavy boundary.
Bg2--37 to 45 inches; gray (5Y 5/1) loam; weak fine and medium subangular blocky structure; friable; few pebbles; slightly acid; clear wavy boundary. (Combined thickness of the Bg horizon is 16 to 24 inches.)
2Cg--45 to 60 inches; dark gray (5Y 4/1) loamy sand; single grained; loose; few pebbles; slightly acid.
TYPE LOCATION: Franklin County, Iowa; about eight miles east of Hampton; 1,675 feet south and 75 feet east of the northwest corner, sec. 36, T. 92 N., R. 19 W.
RANGE IN CHARACTERISTICS: Solum thickness and depth to the 2C horizon typically is 44 to 48 inches but ranges from 40 to 60 inches. The solum typically averages about 26 to 32 percent clay and 15 to 40 percent fine sand or coarser. Free carbonates are absent in the solum and commonly to a depth of 60 inches or more, but pedons with carbonates as shallow as 40 inches are within the range. The solum ranges from slightly acid to mildly alkaline. The mollic epipedon typically is 26 to 32 inches thick but is as thick as 36 inches in a few pedons.
The A horizon is neutral or has hue of 5Y, value of 2 or 3, and chroma of 1 or less. The A horizon typically is clay loam or loam, but the range includes silty clay loam high in content of sand.
Some pedons have a thin AB or BA horizon.
The Bg horizon typically has hue of 5Y or neutral, value of 4 or 5, and chroma of 1 or less. Distinct or prominent mottles are present in some pedons. The Bg horizon is typically clay loam, loam or silty clay loam high in content of sand. A BC horizon is in some pedons. It is loam, gravelly sandy loam, or sandy loam.
The 2Cg horizon typically is loamy sand or gravelly loamy sand. In some pedons it is coarse sand, gravelly coarse sand or gravelly loamy coarse sand. This horizon ranges from slightly acid to moderately alkaline.
COMPETING SERIES: These are the Coland, Comfrey, Delft, Glencoe, James Canyon, Kimmerling, Konner, McClave, Peoh, Romnell and Wenas series in the same family and the Marshan and Millington series. Coland and Comfrey soils formed on flood plains and typically lack coarse-textured substrata. In addition, Comfrey soils have free carbonates higher in the profile. Delft and Glencoe soils lack coarse-textured substrata. James Canyon, Kimmerling, Konner, McClave, Peoh and Wenas soils formed in drier climates. Romnell soils contain gypsum throughout the solum. Marshan soils have contrasting textures in the control section. Millington soils have free carbonates throughout the solum and are in a calcareous family.
GEOGRAPHIC SETTING: Shandep soils are in depressions or flats on stream terraces, flood plains and outwash plains. Slope gradient is 0 to 2 percent. The soils formed in loamy alluvial sediments 40 to 55 inches thick that overlie coarse-textured sediments. The mean annual air temperature ranges from about 45 to 52 degrees F, and the mean annual precipitation ranges from 30 to 34 inches.
GEOGRAPHICALLY ASSOCIATED SOILS: These are the Marshan, Harcot, Talcot, Lawler and Saude soils. These soils have mollic epipedons less than 24 inches thick and coarse-textured substrata above a depth of 40 inches. Lawler and Saude soils are better drained and typically are at higher elevations. Harcot and Talcot soils have free carbonates throughout the solum. Marshan, Harcot, and Talcot soils typically are slightly higher on the landscape.
DRAINAGE AND PERMEABILITY: Very poorly and poorly drained. Runoff is low to ponded. Permeability is moderate in the solum and rapid in the substratum. The very poorly drained phase is frequently ponded during the spring.
USE AND VEGETATION: Undrained areas are used for pasture or wildlife habitat. Drained areas commonly are cropped to corn and soybeans. Native vegetation was prairie grasses.
DISTRIBUTION AND EXTENT: Northern and eastern Iowa and southern Minnesota. These soils are inextensive.
MLRA OFFICE RESPONSIBLE: St. Paul, Minnesota
SERIES ESTABLISHED: Franklin County, Iowa, l977.
REMARKS: This soil has been included with Marshan as a depressional phase in previous surveys.