LOCATION GATEWOOD MOEstablished Series
TAXONOMIC CLASS: Very-fine, mixed, active, mesic Oxyaquic Hapludalfs
TYPICAL PEDON: Gatewood gravelly silt loam - on a convex slope of 7 percent under mixed hardwoods at an elevation of 705 feet. (Colors are for moist soil unless otherwise stated.)
A--0 to 2 inches; dark grayish brown (10YR 4/2) gravelly silt loam, light brownish gray (10YR 6/2) dry; moderate very fine granular structure; very friable; 30 percent chert gravel; many medium and fine roots; slightly acid; abrupt wavy boundary. (1 to 6 inches thick)
E--2 to 5 inches; pale brown (10YR 6/3) gravelly silt loam; few fine prominent yellowish brown (10YR 5/8) mottles; weak thin platy structure parting to moderate very fine granular; very friable; 15 percent chert gravel; many medium and fine roots; moderately acid; clear wavy boundary. (0 to 11 inches thick)
2Bt1--5 to 10 inches; yellowish brown (10YR 5/6) clay; moderate very fine angular blocky structure; firm; few faint clay films on faces of peds; 5 percent chert gravel; common fine roots; strongly acid; gradual smooth boundary.
2Bt2--10 to 19 inches; yellowish brown (10YR 5/6) clay; moderate very fine angular blocky structure; firm; many faint clay films on faces of peds; 5 percent chert gravel; common fine roots; strongly acid; gradual wavy boundary.
2Bt3--19 to 29 inches; yellowish brown (10YR 5/8) gravelly clay; few fine prominent pale olive (5Y 6/3) mottles; weak fine angular blocky structure; very firm; common faint clay films on faces of peds; common shiny pressure faces; 12 percent chert gravel and 3 percent chert cobbles; common fine roots; strongly acid; gradual irregular boundary. (Combined thickness of the Bt horizons is 11 to 35 inches.)
2BC--29 to 36 inches; brownish yellow (10YR 6/6) very channery clay; few medium prominent brown (7.5YR 5/4) and common medium distinct light olive brown (2.5Y 5/4) mottles; weak fine subangular blocky structure; very firm; common medium iron-manganese stains; 50 percent channers of weathered dolomite; few fine roots; neutral; clear irregular boundary. (0 to 8 inches thick)
2R--36 inches; dolomite.
TYPE LOCATION: Ripley County, Missouri; about 1 1/4 mile north of Gatewood; 2100 feet south and 1730 feet west of the northeast corner, sec. 4, T. 22 N., R. 1 W.; USGS Gatewood topographic quadrangle; lat. 36 degrees 35 minutes 34 seconds N. and long. 91 degrees 04 minutes 33 seconds W.
RANGE IN CHARACTERISTICS: Depth to bedrock ranges from 20 to 40 inches. The chert gravel content of the A and E horizons ranges from 0 to 70 percent. The 2Bt horizons contain 5 to 30 percent chert gravel and 0 to 25 percent fragments larger than 3 inches. About 20 percent are less than 1/4 inch in size. Some pedons are stony on the surface. The particle size control section averages from 60 to 85 percent clay.
The A or Ap horizon has value of 2 to 5, and chroma of 1 to 3. It is silt loam, loam, sandy loam, or their gravelly, very gravelly, or extremely gravelly analogues. Reaction ranges from very strongly acid to neutral.
The E horizon has value of 4 to 6, and chroma of 2 to 4. It is silt loam, loam, sandy loam, or their gravelly, very gravelly, or extremely gravelly analogues. Reaction ranges from strongly acid to neutral.
The 2Bt horizon has hue of 2.5YR to 10YR, value of 3 to 6, and chroma of 3 to 8, but may be 2 just above bedrock. It is clay, silty clay, gravelly clay, flaggy clay, very gravelly clay, or gravelly silty clay. Reaction is strongly acid to neutral and ranges to slightly alkaline in the lower part. Some pedons are very strongly acid in the upper part. Redoximorphic colors are in the lower subsoil.
The 2BC or 2C horizon is variable in color. It is the channery or very channery analogs of clay loam, sandy clay loam, silty clay, or clay. Reaction is slighty acid to moderately alkaline.
COMPETING SERIES: There are no other series in this family. Similar series include the Bardley and Arkana series. Bardley soils are well drained and Arkana soils are in the Mollic subgroup.
GEOGRAPHIC SETTING: Gatewood soils are on gently sloping ridges and strongly sloping side slopes in uplands. Slopes range from 1 to 60 percent. They formed in gravelly hillslope sediments and the underlying clayey residuum from cherty limestone or dolomite and shales. Mean annual temperature ranges from 53 to 57 degrees F., and mean annual precipitation ranges from 35 to 45 inches.
GEOGRAPHICALLY ASSOCIATED SOILS: These include Gasconade, Mano, Moko and Ocie soils. Gasconade and Moko soils are less than 20 inches to bedrock. Mano and Ocie soils are greater than 40 inches to bedrock. These soils are on lower side slope positions or on the same positions in the landscape as Gatewood.
DRAINAGE AND PERMEABILITY: Moderately well drained. Permeability is slow. The saturated hydraulic conductivity is moderately low. Runoff is medium to very high. In undisturbed areas, a perched water table with an upper limit of 1.5 to 3 feet is present during parts of late winter and early spring in most years.
USE AND VEGETATION: Most of the Gatewood soils remain in timber consisting of second growth hardwoods and eastern red cedar. Some areas are in cool season pasture.
DISTRIBUTION AND EXTENT: The Ozarks area (MLRAs 116A and 116B) of Missouri and possibly in adjacent parts of Arkansas. The series is of large extent.
MLRA SOIL SURVEY REGIONAL OFFICE (MO) RESPONSIBLE: Morgantown, West Virginia
SERIES ESTABLISHED: Wright County, Missouri, 1979.
REMARKS: Diagnostic horizons and features recognized in this series are:
1) ochric epipedon- the zone from the surface to a depth of 5 inches (the A and E horizons)
2) argillic horizon- the zone from a depth of 5 to 29 inches (2Bt horizons)
3) lithic contact- 36 inches.