LOCATION LAMOTTE MOEstablished Series
TAXONOMIC CLASS: Fine-loamy, mixed, active, mesic Ultic Hapludalfs
TYPICAL PEDON: Lamotte silt loam--on a 12 percent slope in an oak-hickory forest. (Colors are for moist soil unless otherwise stated)
A--0 to 6 inches; dark grayish brown (10YR 4/2) silt loam; pale brown (10YR 6/3) dry; moderate fine granular structure; friable; many fine and medium roots; neutral; clear smooth boundary. (3 to 8 inches thick)
E--6 to 11 inches; brown (10YR 5/3) silt loam; weak fine granular structure; friable; many fine and medium roots; moderately acid; clear smooth boundary. (0 to 7 inches thick)
BE--11 to 15 inches; brown (7.5YR 5/4) silt loam; weak fine subangular blocky structure; friable; common fine and medium roots; very strongly acid; clear smooth boundary. (0 to 6 inches thick)
Bt1--15 to 28 inches; reddish brown (5YR 4/4) clay loam; moderate fine subangular blocky structure; firm; common fine roots; many prominate clay films on faces of peds and bridging surfaces of peds; very strongly acid; clear wavy boundary.
Bt2--28 to 39 inches; reddish brown (2.5YR 4/4) loam; moderate fine subangular blocky structure; firm; few fine roots; common prominent clay films on surfaces of peds; many medium and coarse brown (7.5YR 5/4) masses of iron accumulation; very strongly acid; gradual smooth boundary.
Bt3--39 to 60 inches dark reddish brown (2.5YR 3/4) loam; weak fine and medium subangular blocky structure; very firm; few fine roots; common distinct clay films on faces of peds; many medium and coarse prominent light brownish gray (10YR 6/2) iron depletions; many medium and coarse prominent yellowish red (5YR 5/6) masses of iron accumulation; common fine black masses of iron and manganese accumulation; common fine black iron and manganese concretions; few fine dark gray (10YR 4/1) organic stains coating vertical pores and cracks; 10 percent hard sandstone gravel; extremely acid; abrupt wavy boundary. (Combined thickness of the Bt horizon is 30 to 72 inches)
Cr--60 to 72 inches; dark brown (7.5YR 3/4) weathered sandstone that crushes to sandy loam; extremely firm; bedded with occasional fractures.
TYPE LOCATION: St. Francois County, Missouri; about 4 miles southeast of Farmington; 1.340 feet north and 1,880 feet west of the southeast corner of section 11, T. 35 N., R. 6 E. Latitude 37 degrees, 44 minutes, 53.5 seconds N., longitude 90 degrees, 20 minutes, 2.5 seconds W., NAD83.
RANGE IN CHARACTERISTICS: Depth to bedrock is more than 60 inches. Sandstone gravel is 0 to 10 percent throughout. The particle size control section averages 28 to 35 percent clay and 15 to 40 percent sand coarser than very fine. Concretions and iron depletions are below 36 inches.
The A or Ap horizon has hue of 10YR or 7.5YR, value of 4 or 5, and chroma of 3 or 4. Texture is silt loam or loam.
Some pedons lack E or BE horizons.
The BE and Bt horizons have hue of 7.5YR to 2.5YR, value of 3 to 5, and chroma of 4 to 8. The redder hues are commonly in the lower subhorizons. They are typically clay loam or loam, but the Bt1 is silty clay loam in some pedons and individual horizons may be sandy loam. Sandstone cobbles range from 0 to 5 percent. Reaction ranges from extremely acid to medium acid in the upper part and is very strongly or extremely acid in the lower part.
The C horizon, where present, has hue of 7.5YR to 2.5YR, value of 3 to 5, and chroma of 4 to 8. Redox colors of gray or brown are common. Texture is sandy loam, sandy clay loam, or loam with evidence of rock structure. Reaction ranges from extremely acid to moderately acid.
COMPETING SERIES: These are the Ebbing and Williamsburg series. Ebbing soils have hue of 7.5YR or browner in the lower part of the series control section. Williamsburg soils have water rounded rock fragments in the series control section.
GEOGRAPHIC SETTING: Lamotte soils are on convex sideslopes and point ridges. Slopes range from 3 to 15 percent. They formed in a thin layer of loess and in the underlying residuum weathered from sandstone. The bedrock includes lenses or alternating beds of dolomite in some areas. The mean annual temperature is 54 to 57 degrees F., and the mean annual precipitation is 40 to 45 inches.
GEOGRAPHICALLY ASSOCIATED SOILS: These are the Jonca, Lily, and Ramsey soils. Jonca soils have a fragipan and are on similar landscape postions. Lily and Ramsey soils are shallower to bedrock and are generally on steeper slopes.
DRAINAGE AND PERMEABILITY: Well drained. Runoff is medium to high. Permeability is moderately slow.
USE AND VEGETATION: Most areas are cleared and used for fescue pasture. A few areas are used for growing cultivated crops such as corn, wheat, and grain sorghum. The remaining areas are forested. Native vegetation is oak-hickory forest.
DISTRIBUTION AND EXTENT: The eastern Ozarks area (MLRAs 116A and 116B) of Missouri. The series is of moderate extent.
MLRA SOIL SURVEY REGIONAL OFFICE (MO) RESPONSIBLE: Morgantown, West Virginia
SERIES ESTABLISHED: St. Francois County, Missouri, 1979.
REMARKS: Diagnostic horizons and features recognized in this series are:ochric epipedon - the zone from the surface of the soil to a depth of 15 inches (A, E, and BE horizons) argillic horizon - the zone from approximately 15 to 60 inches (Bt horizons)