LOCATION SNEAD              MO
Established Series


The Snead series consists of moderately deep, moderately well drained, slowly permeable soils that formed in residuum from calcareous, clayey, gray shales and thin interbedded limestone. These soils are on upland side slopes and have slopes ranging from 2 to 30 percent. Mean annual temperature is 55 degrees F, and mean annual precipitation is 37 inches.

TAXONOMIC CLASS: Fine, mixed, superactive, mesic Aquic Hapludolls

TYPICAL PEDON: Snead silty clay loam - on a 7 percent convex southeast-facing slope in a pasture. (Colors are for moist soil unless otherwise stated.)

Ap--0 to 6 inches; very dark gray (10YR 3/1) silty clay loam, gray (10YR 5/1) dry; strong medium granular structure; friable; many very fine roots; few clean sand grains; slightly acid; clear smooth boundary.

A--6 to 12 inches; black (10YR 2/1) silty clay loam, dark gray (10YR 4/1) dry; strong very fine subangular blocky structure; friable; common very fine grass roots; many fine pores; few fine sand grains; slightly acid; clear smooth boundary. (Combined thickness of the A horizon is 7 to 20 inches.)

Bw--12 to 17 inches; mottled very dark gray (10YR 3/1) and grayish brown (10YR 5/2) silty clay; dark grayish brown (10YR 4/2) crushed; strong medium subangular blocky structure; firm; few very fine roots; few very fine pores; neutral; gradual wavy boundary. (4 to 10 inches thick)

BC--17 to 20 inches; mottled very dark gray (10YR 3/1), olive gray (5Y 5/2), and olive (5Y 5/4) clay; weak fine subangular blocky structure; firm; few very fine roots; 5 percent fragments of limestone or white concretions; slight effervescence; moderately alkaline; clear smooth boundary. (3 to 10 inches thick)

C--20 to 25 inches; olive gray (5Y 5/2) silty clay; many medium faint dark gray (5Y 4/1) and many medium prominent olive brown (2.5Y 4/4) mottles; massive; firm; few very fine grass roots; 10 percent fragments of limestone; strong effervescence; moderately alkaline; abrupt smooth boundary. (4 to 18 inches thick)

Cr--25 to 66 inches; olive gray (5Y 5/2) soft shale.

TYPE LOCATION: Caldwell County, Missouri; 3 miles south and 2 miles east of Kingston; 1,800 feet north and 300 feet east of the southwest corner of sec. 1, T. 55 N., R. 28 W.

RANGE IN CHARACTERISTICS: Thickness of the solum ranges from 15 to 40 inches and depth to a paralithic contact ranges from 20 to 40 inches. Depth to free carbonates ranges from 12 inches to the upper limit of the partly weathered shale. The solum is slightly acid or neutral in the upper part and ranges from neutral to moderately alkaline in the lower part. Some pedons are stony.

The A horizon has hue of 10YR or 2.5Y, value of 2 or 3 and chroma of 1 or 2. It is silty clay or silty clay loam but the range includes silt loam with 20 to 27 percent clay. Some pedons are stony or flaggy.

The Bw horizon has hue of 10YR, 2.5Y, or 5Y; value of 3, 4, or 5; and chroma of 1 through 6 and is mottled. It is silty clay or clay or the flaggy or channery analogues. Very dark gray (10YR 3/1) and black (10YR 2/1) stains or streaks typically are in the upper part.

The C horizon has the same range of texture and color as the B horizon.

COMPETING SERIES: These are the Lawshe and the tentative Claysville series. A similar soil is the Sampsel series. Claysville and Sampsel soils have thicker sola. The Lawshe soils are deep and contain a high proportion of interstratified clay minerals.

GEOGRAPHIC SETTING: Snead soils are on upland side slopes. The slope gradients typically average betweeen 10 and 15 percent but range from 2 to 30 percent. The soils formed in residuum weathered from calcareous, clayey, gray shales, and thin interbedded limestone. Mean annual temperature ranges from 52 to 57 degrees F, and mean annual precipitation ranges from 32 to 40 inches.

GEOGRAPHICALLY ASSOCIATED SOILS: These are the Adair, Grundy, Lagonda, Lamoni, Sampsel and Sharpsburg soils which have thicker sola and are on higher positions in the landscape.

DRAINAGE AND PERMEABILITY: Moderately well drained. Runoff is medium to rapid. Permeability is slow.

USE AND VEGETATION: About equal parts are in row crops, such as corn and soybeans, and pasture. Native vegetation was tall prairie grasses.

DISTRIBUTION AND EXTENT: Northern and western Missouri. The series is extensive.


SERIES ESTABLISHED: Daviess County, Missouri, 1952.


National Cooperative Soil Survey