LOCATION TOWNHOLE MOEstablished Series
TAXONOMIC CLASS: Loamy-skeletal, mixed, semiactive, mesic Oxyaquic Paleudalfs
TYPICAL PEDON: Townhole silt loam on a 1 percent slope in an abandoned crop field.
Ap--0 to 5 inches; dark yellowish brown (10YR 3/4) silt loam; weak very fine and fine granular structure; friable; many very fine to medium roots throughout; common very fine and fine tubular pores; 3 percent subangular chert gravel and 3 percent subrounded chert gravel; strongly acid (pH 5.3); clear smooth boundary. (4 to 15 inches)
BA--5 to 16 inches; brown (7.5YR 4/4) silt loam; weak fine and medium granular structure; friable; many very fine to medium roots throughout; many very fine to medium tubular pores; very few distinct discontinuous dark yellowish brown (10YR 3/4) organic coats on upper surfaces of peds or rocks; 4 percent subangular chert gravel and 4 percent subrounded chert gravel; moderately acid (pH 5.8); abrupt smooth boundary. (0 to 12 inches)
Bw1--16 to 22 inches; yellowish brown (10YR 5/4) very gravelly silt loam; weak very fine and fine subangular blocky structure; friable; many very fine and fine roots throughout; many very fine and fine interstitial and tubular pores; very few faint discontinuous pale brown (10YR 6/3) skeletans on rock fragments; 15 percent subangular chert gravel and 15 percent subrounded chert gravel and 15 percent rounded chert gravel; moderately acid (pH 5.6); clear smooth boundary.
Bw2--22 to 31 inches; 60 percent brown (10YR 5/3) and 40 percent strong brown (7.5YR 5/6) very gravelly silt loam; weak very fine and fine subangular blocky structure; friable; many very fine and fine roots throughout; many very fine and fine interstitial and tubular pores; few distinct continuous light brownish gray (10YR 6/2) skeletans throughout; 20 percent subangular chert gravel and 20 percent subrounded chert gravel and 15 percent rounded chert gravel; strongly acid (pH 5.3); abrupt smooth boundary. (combined thickness of the Bw or Bt horizons is 0 to 25 inches)
2Bt1--31 to 48 inches; red (2.5YR 4/6) extremely gravelly clay loam; weak very fine and fine subangular blocky structure; firm; common very fine roots throughout; many very fine to medium interstitial and tubular pores; few faint discontinuous dark red (2.5YR 3/6) clay films on rock fragments and few distinct continuous light brownish gray (10YR 6/2) skeletans on rock fragments and few distinct discontinuous strong brown (7.5YR 4/6) clay films on rock fragments; few fine and medium irregular black (N 2/0) soft masses of iron-manganese accumulation between peds; 30 percent subangular chert gravel and 30 percent subrounded chert gravel and 15 percent rounded chert gravel and 5 percent subrounded chert cobbles; strongly acid (pH 5.2); diffuse boundary. (8 to 33 inches)
3Bt2--48 to 70 inches; red (2.5YR 4/6) extremely gravelly sandy clay; weak very fine and fine subangular blocky structure; firm; common very fine roots throughout; common very fine to medium interstitial and tubular pores; few faint discontinuous dark red (2.5YR 3/6) clay films on rock fragments and few distinct discontinuous pale brown (10YR 6/3) skeletans on rock fragments; common fine and medium irregular black (N 2/0) manganese coatings between peds; 5 percent subangular chert cobbles and 5 percent subrounded chert cobbles and 28 percent subrounded chert gravel and 2 percent subrounded paragravel and 30 percent rounded chert gravel and 15 percent subangular chert gravel; strongly acid (pH 5.3); abrupt wavy boundary. (9 to 46 inches)
4Bt3--70 to 82 inches; 65 percent yellowish brown (10YR 5/4) and 35 percent strong brown (7.5YR 4/6) extremely gravelly loam; weak very fine and fine subangular blocky structure; firm; common very fine to medium interstitial and tubular pores; few prominent discontinuous brown (7.5YR 4/4) clay films on rock fragments and few distinct continuous gray (10YR 6/1) skeletans on rock fragments and few distinct discontinuous red (2.5YR 4/6) clay films on rock fragments; common fine and medium irregular black (N 2/0) soft masses of iron-manganese accumulation between peds; 10 percent subangular chert cobbles and 10 percent angular chert gravel and 15 percent subangular chert gravel and 25 percent subrounded chert gravel and 30 percent rounded chert gravel; strongly acid (pH 5.3).
TYPE LOCATION: McDonald County Missouri; 1 mile north of Cyclone; 2,150 feet north and 2,300 feet east of the southwest corner of section 15, T. 22 N., R. 31 W. McNatt USGS quadrangle; UTM Zone: 15S; Easting: 0386337; Northing: 4054385; Lat. 36 deg 37 min 48.2 sec N, Long. 94 deg 16 min 16.5 sec W.
RANGE IN CHARACTERISTICS:
Solum thickness and depth to bedrock is 60 to 80 inches or more. Depth to redoximorphic features is 16 to 40 inches. Pedons that have 10 or more inches of mollic surface have base saturation of less than 50 percent at the critical depth.
Ap or A horizon
Hue: 10YR
Value: 3 or 4
Chroma: 1 to 4
Fine-earth: silt loam.
Rock fragments: 5 to 45 percent gravel
Reaction: strongly acid to neutral
BA horizon
Hue: 10YR or 7.5YR
Value: 3 to 5
Chroma: 4
Fine-earth: silt loam
Rock fragments: 5 to 55 percent gravel
Reaction: strongly acid or moderately acid
Note: An E horizon may be present
Bw or Bt horizon
Hue: 10YR or 7.5YR
Value: 3 to 6
Chroma: 3 to 6
Clay depletions (when present): 10YR 6/2 or 10YR 5/2
Fine-earth: silt loam
Rock fragments: 5 to 80 percent gravel
Reaction: very strongly acid and moderately acid
2Bt horizon
Hue: 10YR to 2.5YR
Value: 3 to 6
Chroma: 3 to 8
Clay depletions (when present)
Hue: 10YR
Value: 4 to 6
Chroma: 1 or 2
Fine earth: silt loam, loam, silty clay loam, clay loam or sandy clay loam
Rock fragments: 50 to 80 percent gravel, 0 to 10 percent cobbles
Reaction: extremely acid to moderately acid
Note: A 2Bw horizon may be present
Note: Some pedons contain tripolitic chert parafragments
3Bt horizon
Hue: 10YR to 2.5YR
Value: 3 to 6
Chroma: 3 to 8
Clay depletions (when present)
Hue: 10YR
Value: 4 to 6
Chroma: 1 or 2
Fine earth: silt loam, clay loam, silty clay loam, sandy clay loam, sandy clay or clay
Rock fragments: 2 to 85 percent gravel, 0 to 35 percent cobbles, 0 to 2 percent channers
Reaction: extremely acid to moderately acid
Note: Some pedons contain tripolitic chert parafragments
4Bt horizon
Hue: 2.5Y to 2.5YR
Value: 3 to 7
Chroma: 4 to 8
Clay depletions (when present)
Hue: 10YR
Value: 4 to 7
Chroma: 1 or 2
Fine earth: loam, silty clay loam, silty clay or clay
Rock fragments: 0 to 80 percent gravel, 0 to 30 percent cobbles, 0 to 50 percent channers
Reaction: very strongly acid to moderately acid
COMPETING SERIES: There are no other series in this family.
GEOGRAPHIC SETTING: Townhole soils are on strath terraces, structural benches, and high stream terraces in the Ozarks. Slopes are convex or linear and range from 1 to 8 percent. These soils formed in cherty or silty colluvium, slope alluvium and old alluvium and/or residuum from cherty limestone, dolomite, or shale in Mississippian geology. The mean annual temperature varies from 57 to 59 degrees F. The mean annual precipitation varies from 38 to 48 inches.
GEOGRAPHICALLY ASSOCIATED SOILS: These are the Cedargap, Goss, Hailey, Jollymill, and Rueter soils. Cedargap soils are mollisols and are on the adjacent floodplains. Jollymill soils are 40 to 60 inches to bedrock. Goss soils have a clayey-skeletal particle size class. Rueter soils are somewhat excessively drained. Hailey soils are excessively drained. Jollymill, Rueter, and Goss soils are on side slopes. Hailey soils are on shoulder slopes and side slopes.
DRAINAGE AND PERMEABILITY: Moderately well drained, slow or medium runoff, slow permeability. The saturated hydraulic conductivity is moderately low. A saturated zone is present at 1.5 to 3.0 feet for a month or more from late fall to late spring in most years.
USE AND VEGETATION: Most of these soils are cleared and used for pasture and hayland. A few areas remain forested. Native vegetation is dominantly mixed hardwoods and pine. Native vegetation in areas bordering the Cherokee Prairie is savanna.
DISTRIBUTION AND EXTENT: The Ozarks region of Missouri (MLRA 116B). This series is of small extent; about 4,800 acres have been mapped to date.
MLRA SOIL SURVEY REGIONAL OFFICE (MO) RESPONSIBLE: Morgantown, West Virginia
SERIES ESTABLISHED: McDonald County, Missouri, 2004. The name is from a public fishing access .
REMARKS: Diagnostic horizons and features in this pedon are:
1) Ochric epipedon - the zone from 0 to 5 inches (Ap horizon)
2) Argillic horizon - the zone from 31 to 82 inches (2Bt1, 3Bt2 and 4Bt3 horizons)
3) Oxyaquic feature - the zone from 22 to 48 inches (Bw2 and 2Bt1 horizons)
ADDITIONAL DATA: Pedon ID Number 98MO119171. University of Missouri Soil Characterization Laboratory sample number M9811903.