LOCATION BREVATOR MOEstablished Series
TAXONOMIC CLASS: Fine, smectitic, mesic Typic Hapludalfs
TYPICAL PEDON: Brevator loam - on a 14 percent west-facing slope in a hardwood forest. (Colors are for moist soil unless otherwise stated.)
Ap--0 to 5 inches; brown (10YR 4/3) loam, pale brown (10YR 6/3) dry; weak very fine granular structure; very friable; few fine roots; slightly acid; clear smooth boundary. (4 to 10 inches thick)
E--5 to 13 inches; yellowish brown (10YR 5/4) cherty loam; weak very fine granular structure; very friable; few fine roots; 25 percent chert fragments; medium acid; clear smooth boundary. (3 to 10 inches thick)
2Bt1--13 to 17 inches; red (2.5YR 4/6) clay; moderate fine subangular blocky structure; firm; few fine roots; common faint clay films; few round pebbles; common sand grains; strongly acid; clear smooth boundary.
2Bt2--17 to 30 inches; strong brown (7.5YR 5/6) clay; moderate fine subangular blocky structure; firm; few fine roots; common faint clay films; few rounded pebbles; common sand grains; strongly acid; clear smooth boundary.
2Bt3--30 to 45 inches; yellowish brown (10YR 5/6) silty clay; weak fine subangular blocky structure; firm; few faint clay films; few rounded pebbles; few sand grains; medium acid; gradual smooth boundary. (Combined thickness of the Bt horizons is 30 to 54 inches.)
2C--45 to 60 inches; yellowish brown (10YR 5/6) silty clay; massive; firm; common rounded pebbles; common sand grains; medium acid.
TYPE LOCATION: Lincoln County, Missouri; about 5 miles south of Troy; 600 feet north and 1400 feet east of the southwest corner of sec. 35, T. 48 N., R. 1 W.
RANGE IN CHARACTERISTICS: The solum thickness is 40 to 60 inches or more. A chert or pebble band commonly is above the Bt horizon.
The Ap horizon has hue of 10YR or 7.5YR, value of 4 or 5, and chroma of 2 to 5. Some pedons have a thin A horizon with hue of 10YR, value of 3 or 4, and chroma of 1 to 3. It is loam or silt loam and strongly acid to neutral.
The E horizon has hue of 10YR, value or 4 to 6, and chroma of 3 to 5. It is loam or silt loam or their cherty analogues. It is very strongly acid to slightly acid.
The upper part of the Bt horizon has hue of 5YR or 2.5YR, value of 4 or 5, and chroma of 4 to 8. The lower part of the Bt horizon and C horizon has hue of 7.5YR or 10YR, value of 4 or 5, and chroma of 4 to 6. It is clay, clay loam, or silty clay with clay content of 35 to 50 percent. It is very strongly acid to medium acid.
COMPETING SERIES: These are the Ainsworth, Clinton, Hatton, Haymarket (T), Lunt, Ursa, and Welda soils in the same family and the Armster, Armstrong, and Keswick series. Ainsworth soils have sandy strata in the lower part of the profile. Clinton , Hatton, and Welda soils have less sand throughout the profile. In addition, Clinton and Hatton soils have hue of 7.5YR or yellower in the upper Bt horizon. Haymarket soils have coarse fragments of diabase and basalt. Lunt soils have mica flakes in the B and C horizons and have coarse fragments of quartz. Ursa soils do not have hue of 2.5YR or 5YR in the upper part of the Bt horizon. Armster and Armstrong soils have a thicker dark colored surface. Keswick soils have mottles with chroma of 2 or less in the upper part of the Bt horizon.
GEOGRAPHIC SETTING: Brevator soils are on convex side slopes and narrow interfluve positions. Slope gradients range from 14 to 30 percent. These soils formed in a glacial till derived paleosol with the horizons above the pebble band formed in localized pedisediments. The mean annual temperature ranges from 53 to 57 degrees F, and mean annual precipitation ranges from 36 to 44 inches.
GEOGRAPHICALLY ASSOCIATED SOILS: These are the competing Hatton and Keswick and the Goss soils. Hatton and Keswick soils are higher on the slope. Goss soils are cherty in the subsoil and are lower on the slope.
DRAINAGE AND PERMEABILITY: Well drained. Runoff is medium to very rapid. Permeability is moderately slow.
USE AND VEGETATION: Most areas are in oak and hickory forest. Some areas are used for hayland and pasture. Native vegetation is mixed hardwoods.
DISTRIBUTION AND EXTENT: Northeastern Missouri. This series is of small extent.
MLRA SOIL SURVEY REGIONAL OFFICE (MO) RESPONSIBLE: Indianapolis, Indiana
SERIES ESTABLISHED: Lincoln County, Missouri, 1985.
REMARKS: Diagnostic horizons and features recognized in this series are: ochric epipedon - the zone from the surface of the soil to a depth of 13 inches (Ap, E horizons); argillic horizon - the zone from approximately 13 inches to 45 inches (2Bt horizon); udic moisture regime.