LOCATION LALLIE ND+MN MT SDEstablished Series
TAXONOMIC CLASS: Fine, smectitic, calcareous, frigid Vertic Fluvaquents
TYPICAL PEDON: Lallie silty clay loam - on a level slope under native grass. When described the soil was moist throughout. (Colors are for moist soil unless otherwise stated)
A--0 to 2 inches; black (10YR 2/1) silty clay loam, dark gray (10YR 4/1) dry; moderate medium and fine granular structure; slightly hard, friable, sticky and plastic; many roots; common fine flecks of salt; strongly effervescent; slightly alkaline; abrupt smooth boundary. (1 to 5 inches thick)
Cg--2 to 24 inches; dark gray (5Y 4/1) silty clay loam, light gray and gray (5Y 6/1) dry; common medium prominent dark yellowish brown (10YR 4/4) redoximorphic concentrations; weak coarse prismatic structure parting to moderate fine subangular blocky; slightly hard, friable, sticky and plastic; common fine roots; few fine flecks of salt; violently effervescent; slightly alkaline; abrupt wavy boundary. (8 to 26 inches thick)
Ab--24 to 32 inches; black (N 2/0) silty clay, very dark gray (5Y 3/1) dry; weak coarse prismatic structure parting to moderate medium and fine subangular blocky; hard, firm, very sticky and very plastic; few fine roots; common fine flecks of salt; few snail shell fragments; strongly effervescent; moderately alkaline; gradual wavy boundary. (0 to 8 inches thick)
C'g--32 to 60 inches; olive gray (5Y 4/2) silty clay, light gray and gray (5Y 6/1) dry; common fine prominent yellowish brown (10YR 5/4) redoximorphic concentrations; massive; very hard, very firm, very sticky and very plastic; few flecks of salt; common snail fragments; strongly effervescent; slightly alkaline.
TYPE LOCATION: Nelson County, North Dakota; about 1 1/2 miles west and 4 miles north of Tolna; 2630 feet east and 1300 feet south of the northwest corner, sec. 21, T. 151 N., R. 61 W.
RANGE IN CHARACTERISTICS: The 10-to 40-inch particle-size control section averages between 35 and 60 percent clay. Typically, it is layered or varved in the lower part and contains one or more buried horizons. Some pedons have surface layers up to 15 inches thick consisting of recent sediments. Some pedons have an O horizon. Some pedons are nonsaline.
The A horizon has hue of 10YR, 2.5Y or 5Y, value of 2 to 4 and 3 to 6 dry, and chroma of 1 or 2. It is silty clay loam, silty clay, loam, silt loam, clay loam, sandy loam, or clay. These textures in the ponded phase may have a mucky modifier. The A horizon is neutral to strongly alkaline.
The C horizon has hue of 2.5Y or 5Y, or is neutral, value of 3 to 6 and 4 to 8 dry, and chroma of 2 or less. Some pedons have higher chromas in the lower part. It typically is silty clay loam or silty clay, but it is clay in some pedons. It is massive or has weak or moderate grades of structure. It does not have snail shell fragments and salts in some pedons. It has gypsum in some pedons. Layers of coarser materials are at depths below 40 inches in some pedons. It is slightly alkaline to strongly alkaline. Silt loam strata up to 6 inches thick are in some pedons.
COMPETING SERIES: There are no series in the same family.
GEOGRAPHIC SETTING: Lallie soils are on level and nearly level lake basins and old oxbows of river channels. Slope gradients are 0 to 2 percent. The soils formed in stratified clayey lacustrine or alluvial sediments. The mean annual air temperature ranges from 34 to 45 degrees F and mean annual precipitation ranges from 12 to 23 inches. Frost-free period ranges from 105 to 140 days. Elevation above sea level ranges from 650 to 3600 feet.
GEOGRAPHICALLY ASSOCIATED SOILS: These are the Colvin, Grano, Hegne and Minnewaukan soils on lake plains and Banks, Havrelon, Lohler and Trembles soils on floodplains. Banks, Havrelon, Lohler, Minnewaukan and Trembles soils are not as wet. In addition, Banks and Minnewaukan soils are sandy, Havrelon soils are fine-loamy, and Trembles soils are coarse-loamy. Colvin soils are fine-silty. Grano and Hegne soils have a mollic epipedon.
DRAINAGE AND PERMEABILITY: Poorly or very poorly drained. Runoff is ponded. Permeability is slow. A seasonal high water table is at the surface to 1 foot below the surface at some time during the period April through August. It is from one foot above the surface to one foot below the surface throughout the year in the ponded phase.
USE AND VEGETATION: Used for pasture, hay, and wildlife. A few areas are cropped. Native vegetation is slough sedge and rivergrass.
DISTRIBUTION AND EXTENT: North Dakota and parts of Montana and South Dakota. The soil is moderately extensive.
MLRA SOIL SURVEY REGIONAL OFFICE (MO) RESPONSIBLE: St. Paul, Minnesota
SERIES ESTABLISHED: Eddy and parts of Benson and Nelson Counties, North Dakota, 1971.
REMARKS: Diagnostic horizons and features recognized in this pedon are: ochric epipedon - the zone from the surface of the soil to a depth of 2 inches; aquic suborder criteria - redoximorphic concentrations and chroma of less than 2 within 50 cm (Cg horizon); irregular decrease in organic carbon with depth - buried horizon in the zone from 24 to 32 inches (Ab horizon); Vertic criteria - LE of more than 6 cm in upper meter.
ADDITIONAL DATA: "Depth to Apparent Water Table in Selected North Dakota Soils." Soil Conservation Service.