LOCATION LEVASY MOEstablished Series
TAXONOMIC CLASS: Clayey over loamy, smectitic, calcareous, mesic Fluvaquentic Endoaquolls
TYPICAL PEDON: Levasy silty clay - on a 0.5 percent slope in a cultivated field. (Colors are for moist soil unless otherwise stated.)
Ap--0 to 6 inches; very dark gray (10YR 3/1) silty clay, dark gray (10YR 4/1) dry; weak fine subangular blocky structure parting to moderate fine granular; firm; few fine roots; slight effervescence; mildly alkaline; abrupt smooth boundary.
A--6 to 17 inches; very dark grayish brown (2.5Y 3/2) silty clay, dark grayish brown (2.5Y 4/2) dry; moderate fine subangular blocky structure; firm; few fine roots; few fine prominent reddish brown (5YR 4/4) masses of iron accumulation in ped interiors; slight effervescence; mildly alkaline; clear smooth boundary. (Combined thickness of the A horizons is 10 to 24 inches.)
Bg--17 to 29 inches; dark grayish brown (2.5Y 4/2) silty clay; weak fine subangular blocky structure; firm; few fine roots; few fine prominent reddish brown (5YR 4/4) masses of iron accumulation in ped interiors; dark gray (10YR 4/1) coatings on faces of peds; strong effervescence; mildly alkaline; abrupt smooth boundary. (0 to 14 inches thick)
Cg--29 to 60 inches; stratified grayish brown (2.5Y 5/2) and dark grayish brown (2.5Y 4/2) very fine sandy loam; massive; a 2 inch layer of very dark gray (10YR 3/1) silty clay (54 to 56 inches); few fine roots; very friable; common fine distinct gray (10YR 5/1) and dark yellowish brown (10YR 4/4) and few fine prominent reddish brown (5YR 4/4) masses of iron accumulation in ped interiors; violent effervescence; mildly alkaline.
TYPE LOCATION: Platte County, Missouri; about 1 mile southwest of Beverly; 2,310 feet north and 25 feet east of the southwest corner of sec. 36, T. 53 N., R. 36 W.
RANGE IN CHARACTERISTICS: Thickness of the mollic epipedon ranges from 10 to 24 inches. The clayey surface horizons and Bg horizon are underlain at 20 to 38 inches by loamy deposits. These soils contain free carbonates throughout. Reaction is mildly alkaline or moderately alkaline.
The Ap or A horizon has hue of 10YR to 5Y, value of 2 or 3 and chroma of 1 or 2. It is silty clay loam, silty clay, or clay.
The Bg horizon has hue of 10YR to 5Y, value of 4 or 5 and chroma of 1 or 2.
The Cg horizon has hue of 2.5Y or 5Y, value of 4 to 6 and chroma of 1 or 2. It is very fine sandy loam, silt loam, loam, fine sandy loam, or loamy very fine sand. The clay percentage ranges from 12 to 27 percent. Thin strata of coarser or finer texture are commonly present.
COMPETING SERIES: These are the Myrick soils. Myrick soils have clay horizons to a depth of less than 20 inches.
GEOGRAPHIC SETTING: Levasy soils are on nearly level to slightly depressional areas on recent flood plains of the major streams. They formed in 20 to 38 inches of clayey alluvium underlain by loamy alluvium. Slope gradient is 0 to 2 percent. The mean annual temperature is 52 to 57 degrees F, and mean annual precipitation ranges from 30 to 40 inches.
GEOGRAPHICALLY ASSOCIATED SOILS: These are the Gilliam, Haynie, Leta, Myrick, Parkville and Waldron soils. Gilliam soils have a fine-silty and Haynie soils have a coarse-silty particle size control section. Gilliam and Haynie soils occur on slightly higher areas of the flood plain. Leta soils occur on slightly higher areas of the flood plain. Myrick soils occur on similar landscapes and Parkville soils occur on slightly higher areas of the flood plain. Waldron soils are somewhat poorly drained, have a fine particle size control and are on slightly higher areas of the flood plain.
DRAINAGE AND PERMEABILITY: Very poorly and poorly drained. Runoff is very slow or ponded. Permeability is slow in the upper part and moderate in the lower part. In most years, an apparent water table has an upper limit of +0.5 to 1.0 feet where very poorly drained from November to July, and 0.0 to 1.5 feet where poorly drained from November to June.
USE AND VEGETATION: Large areas are cleared and cultivated. Corn, hay, soybeans, and wheat are the principal crops and some areas are used for pasture. Native vegetation is cottonwood trees, wetland grasses, and willow.
DISTRIBUTION AND EXTENT: Missouri River flood plain. The acreage is moderately extensive.
MLRA SOIL SURVEY REGIONAL OFFICE (MO) RESPONSIBLE: Indianapolis, Indiana
SERIES ESTABLISHED: Platte County, Missouri, 1982.
REMARKS: Diagnostic horizons and features recognized in this series are: mollic epipedon - the zone from the surface of the soil to a depth of 17 inches (Ap and A horizons).