LOCATION TRACKLER MOEstablished Series
TAXONOMIC CLASS: Fine-loamy, mixed, active, mesic Aquic Hapludults
TYPICAL PEDON: Trackler silt loam - on a shoulder of a ridge point with 8 percent slope in hardwood forest at an elevation of 890 feet. (Colors are for moist soil unless otherwise stated.)
A--0 to 1 inches; brown (10YR 4/3) silt loam; pale brown (10YR 6/3) (dry); moderate very fine granular structure; very friable; many very fine and fine and few medium roots; 3 percent subrounded rhyolite gravel and 1 percent rhyolite cobbles; strongly acid (pH 5.5); abrupt smooth boundary. (1 to 6 inches thick)
E--1 to 7 inches; yellowish brown (10YR 5/4) silt loam; very pale brown (10YR 7/3) (dry); moderate fine subangular blocky structure parting to moderate very fine granular; friable; many very fine and fine and few medium and coarse roots; 2 percent subrounded rhyolite gravel and 1 percent rhyolite cobbles; very strongly acid (pH 4.7); clear smooth boundary. (4 to 6 inches thick)
Bt1--7 to 13 inches; yellowish brown (10YR 5/6) silt loam; moderate very fine and fine subangular blocky structure; friable; many very fine and fine and few medium and coarse roots; common faint clay films on faces of peds; 2 percent subrounded rhyolite gravel and 3 percent rhyolite cobbles; very strongly acid (pH 4.9); clear smooth boundary. (6 to 22 inches thick)
2Bt2--13 to 22 inches; strong brown (7.5YR 5/6) cobbly silt loam; moderate fine subangular blocky structure; friable; many very fine, common fine, and few medium roots; many distinct clay films on faces of peds; few faint brown (7.5YR 5/4) clay depletions on faces of peds and along larger root channels; 10 percent subrounded rhyolite gravel and 10 percent rhyolite cobbles; strongly acid (pH 5.1); clear smooth boundary. (9 to 16 inches thick)
3Bt3--22 to 30 inches; strong brown (7.5YR 4/6) extremely stony loam; weak coarse prismatic structure; firm; common very fine and few fine roots; common distinct clay films on faces of peds and few prominent pinkish gray (7.5YR 6/2) clay flows on faces of peds and rock fragments; common prominent light brown (7.5YR 6/4) clay depletions; 7 percent rhyolite gravel, 15 percent rhyolite cobbles (some decomposed), and 40 percent rhyolite stones; very strongly acid (pH 5.0); clear wavy boundary. (0 to 8 inches thick)
3CB--30 to 44 inches; strong brown (7.5YR 4/6) extremely stony loam; massive; firm; few fine roots concentrated in gray seams; few prominent brown (7.5YR 5/2) clay films on rock fragments; few prominent light gray (10YR 7/2) iron depletions in pockets and seams; few coarse distinct strong brown (7.5YR 5/8) masses of iron accumulation; 2 percent rhyolite gravel, 10 percent rhyolite cobbles, and 60 percent rhyolite stones; very strongly acid (pH 4.8); abrupt wavy boundary. (0 to 14 inches thick)
3R--44 inches; alkali rhyolite with a one-half-inch soft weathered rind.
TYPE LOCATION: Madison County, Missouri; about 6.5 miles west of Millcreek; 950 feet north and 3,000 feet east of the southwest corner of section 19, T. 33 N., R. 6 E.; Marquand USGS quadrangle; latitude 37 degrees 28 minutes 35 seconds N., longitude 90 degrees 12 minutes 0 seconds W..
RANGE IN CHARACTERISTICS: Depth to the 2Bt horizon ranges from 13 to 27 inches. The solum thickness and depth to bedrock ranges from 40 to 60 inches.
A or Ap horizon
Hue: 10YR
Value: 3 or 4
Chroma 2 or 3
Fine earth: silt loam
Rock fragments: 0 to 5 percent gravel, 0 or 1 percent cobbles
Reaction: very strongly acid to moderately acid
E horizon:
Hue: 10YR
Value: 4 or 5
Chroma: 3 or 4
Fine earth: silt loam
Rock fragments: 0 to 6 percent gravel, 0 or 1 percent cobbles
Reaction: very strongly acid to moderately acid
Bt horizon
Hue: 7.5YR or 10YR
Value: 4 or 5
Chroma: 4 or 6
Fine earth: silt loam, silty clay loam, clay loam
Rock fragments: 0 to 15 percent gravel and 0 to 10 percent cobbles
Reaction: strongly and very strongly acid
2Bt horizon
Hue: 5YR to 10YR
Value: 4 to 6
Chroma: 2 to 8
Fine earth: silt loam, loam, clay loam, silty clay loam, clay, or silty clay
Rock fragments: 5 to 35 percent gravel, 0 to 30 percent cobbles, 0 to 15 percent stones
Reaction: strongly or very strongly acid
Redoximorphic features: iron depletions and iron or manganese accumulations
3Bt and 3CB horizons
Hue: 10YR or 7.5YR
Value: 4 or 5
Chroma: 4 or 6
Fine earth: loam, clay loam, coarse sandy loam, loamy coarse sand
Rock fragments: 35 to 75 percent total; 2 to 60 percent gravel, 0 to 50 percent cobbles, and 0 to 75 percent stones
Reaction: very strongly acid or strongly acid
Redoximorphic features: iron depletions, iron or manganese accumulations
COMPETING SERIES: These are the Adelphia, Blairton, Brumbaugh, Cana, Cotaco, Delanco, Dillard, Fenwick, Holmdel, Tuscarawas, Wharton, Whiteside, and Woodstown series. Adelphia, Brumbaugh, Cotaco, Delanco, Dillard, Holmdel, Whiteside, and Woodstown soils are deeper than 60 inches to a lithic contact. In addition, Adelphia and Holmdel soils contain glauconite. Blairton and Fenwick soils have a lithic contact from 20 to 40 inches. Cana soils contain small pebbles of glacial origin. Tuscarawas soils contain channer size shale fragments. Wharton soils do not have a 2Bt horizon.
GEOGRAPHIC SETTING: Trackler soils are on mountain ridges, knobs, and structural benches underlain by fine-grained igneous rocks. The soils formed in loamy materials weathered from acid igneous rocks. The residuum and most of the colluvium is from rhyolite rocks but some of the materials have deposits from granite rocks. Soils on summit positions often have a loessial component in their upper profiles. Slopes range from 3 to 15 percent. Mean annual temperature is 54 to 58 degrees F., and the mean annual precipitation is 40 to 47 inches.
GEOGRAPHICALLY ASSOCIATED SOILS: These include the Delassus, Hassler, Irondale, Killarney, Knobtop, Midco, Relfe, Secesh, Skranka, Syenite, and Taumsauk. Delassus soils have a fragipan. Hassler soils formed in residuum from granite. Knobtop soils are moderately deep and fine-silty. They are all on similar landscape positions as Trackler. Irondale, Killarney, and Taumsauk are loamy-skeletal and are on steeper slopes. Taumsauk soils are shallow and Irondale soils are moderately deep to bedrock. Killarney soils are very deep and well drained. Skranka soils have more clay, a higher base saturation, and are lower in the landscape. The well drained Syenite soils are moderately deep to granite bedrock and are on side slopes at lower elevations. Midco, Secesh, and Relfe are freer drained and are on lower terraces and flood plains.
DRAINAGE AND PERMEABILITY: Moderately well drained. Runoff is medium to high. Permeability is moderately slow. A perched water table is present in most years from two to four feet.
USE AND VEGETATION: Most areas are in forest. Other areas are cleared and used for grass and legume pasture or hay crops. Native vegetation is shortleaf pine and hardwoods.
DISTRIBUTION AND EXTENT: The St. Francois Mountains area of the Ozark Highlands (MLRA 116A) of southeast Missouri. The series is of moderate extent.
MLRA SOIL SURVEY REGIONAL OFFICE (MO) RESPONSIBLE: Morgantown, West Virginia
SERIES ESTABLISHED: Madison County, Missouri, 1998.
REMARKS: Diagnostic horizons and features recognized in this pedon are:
Ochric epipedon - the zone from 0 to 7 inches (A and E horizons)
Argillic horizon - the zone from 7 to 30 inches (Bt1, 2Bt2, 3Bt3)
ADDITIONAL DATA: University of Missouri Soil Characterization Lab number M9312321.
These soils were previously included with Delassus, Knobtop, and Irondale soils in mapping.