LOCATION LOSTPOND MOEstablished Series
TAXONOMIC CLASS: Fine-loamy, siliceous, active, mesic Aquic Hapludalfs
TYPICAL PEDON: Lostpond silt loam - on a 2 percent slope in a pasture at an elevation of 1,060 feet. (Colors are for moist soil unless otherwise stated)
Ap--0 to 8 inches; brown (10YR 4/3) silt loam; weak fine subangular blocky structure parting to weak fine granular; friable; many fine roots throughout; many very fine and fine irregular pores; 2 percent chert gravel; neutral (pH 6.6); clear smooth boundary. (4 to 10 inches thick)
Bt1--8 to 15 inches; 80 percent brown (7.5YR 4/4) and 20 percent dark yellowish brown (10YR 4/4) silt loam; moderate medium subangular blocky structure; friable; common fine roots throughout; common fine tubular pores; many distinct strong brown (7.5YR 4/6) clay films on faces of peds; 5 percent chert gravel; neutral (pH 7.0); clear wavy boundary.
Bt2--15 to 20 inches; brown (7.5YR 5/4) silt loam; moderate medium subangular blocky structure; firm; common fine roots throughout; common fine irregular and tubular pores; many distinct reddish brown (5YR 4/4) clay films on faces of peds; common fine distinct light brownish gray (10YR 6/2) iron depletions throughout; 10 percent chert gravel; neutral (pH 6.9); clear wavy boundary. (Combined thickness of the Bt horizon is 10 to 33 inches)
2Bt3--20 to 29 inches; yellowish brown (10YR 5/4) gravelly clay loam; moderate medium subangular blocky structure; firm; few fine roots throughout; common fine irregular and tubular pores; many distinct brown (7.5YR 4/4) clay films on faces of peds; common fine distinct light brownish gray (10YR 6/2) iron depletions throughout; common distinct pale brown (10YR 6/3) silt coats; many red (2.5YR 4/6) masses of iron accumulation; many fine and medium black (10YR 2/1) iron-manganese concretions throughout; 15 percent chert gravel; slightly acid (pH 6.4); clear smooth boundary.
2Bt4--29 to 35 inches; brown (7.5YR 4/4) gravelly loam; moderate medium subangular blocky structure; firm; few very fine roots throughout; common fine irregular and tubular pores; many distinct strong brown (7.5YR 4/6) clay films on faces of peds, many red (2.5YR 4/6) iron accumulations; common fine and medium prominent light brownish gray (10YR 6/2) iron depletions throughout; many fine and medium prominent black (10YR 2/1) hard concretions of iron-manganese throughout; 15 percent chert gravel; slightly acid (pH 6.5); clear smooth boundary.
2Bt5--35 to 39 inches; 60 percent brown (10YR 5/3), 20 percent dark yellowish brown (10YR 4/4), and 20 percent yellowish brown (10YR 5/6) gravelly loam; moderate medium subangular blocky structure; firm; few very fine roots throughout; common fine irregular and tubular pores; many distinct reddish brown (5YR 4/4) clay films on faces of peds, many black (10YR 2/1) iron accumulations on faces of peds; common fine and medium faint grayish brown (10YR 5/2) iron depletions throughout; many fine and medium prominent black (10YR 2/1) iron-manganese concretions throughout; 25 percent chert gravel; neutral (pH 6.7); clear smooth boundary.
2Bt6--39 to 80 inches; 60 percent strong brown (7.5YR 4/6) and 40 percent brown (7.5YR 4/4) gravelly loam; moderate fine and medium subangular blocky structure; firm; few very fine roots throughout; few fine irregular and tubular pores; common faint brown (7.5YR 4/4) and common distinct reddish brown (5YR 4/4) clay films on faces of peds, many black (10YR 2/1) iron accumulations on faces of peds; common fine distinct grayish brown (10YR 5/2) iron depletions throughout; common fine and medium prominent black (10YR 2/1) iron-manganese concretions throughout; 30 percent chert gravel; neutral (pH 6.9). (Combined thickness of the 2Bt horizon is 50 or more inches)
TYPE LOCATION: Howell County Missouri; 4 miles SW of West Plains; 1,600 feet west and 225 feet north of the southeast corner of section 34, T. 24 N., R. 9 W; Southfork, Missouri USGS quadrangle lat. 36 degrees 42 minutes 19 seconds N. and long. 91 degrees 56 minutes 22 second W.
RANGE IN CHARACTERISTICS: Solum thickness is more than 80 inches.
A or Ap horizon
Rock fragments: 0 to 30 percent gravel
Hue: 10YR
Value: 3 or 4
Chroma: 2 or 3
Fine earth: silt loam, loam
Reaction: very strongly acid to neutral
Subsurface horizon (where present)
Rock fragments: 0 to 30 percent gravel
Hue: 10YR or 7.5YR
Value: 4 or 5
Chroma: 3 or 4
Fine earth: silt loam, loam
Reaction: very strongly acid to neutral
Bt horizon
Rock fragments: 0 to 30 percent gravel or cobbles
Hue: 10YR or 7.5YR
Value: 4 to 6
Chroma: 4 or 6
Fine earth: silt loam, silty clay loam, loam, clay loam
Reaction: strongly acid to neutral
2Bt horizon
Rock fragments: 0 to 40 percent gravel or cobbles
Hue: 10YR to 2.5YR
Value: 4 or 5
Chroma: 3 to 6
Fine earth: silt loam, silty clay loam, loam, clay loam, clay
Reaction: moderately acid to neutral
COMPETING SERIES: Lostpond is the only series in the family.
GEOGRAPHIC SETTING: Lostpond soils are on stream terraces. Slopes range from 1 to 3 percent. These soils formed in loamy alluvium. Elevations are commonly 400 to 1,200 feet. Mean annual temperature ranges from 54 to 58 degrees F., and the mean annual precipitation varies from 40 to 45 inches.
GEOGRAPHICALLY ASSOCIATED SOILS: These are Britwater, Gunlock, Hartville and Pomme soils. Britwater soils are on stream terraces and well drained. Gunlock soils are fine textured and are on foot slopes. Hartville soils are fine textured and are on footslopes and high stream terraces. Pomme soils are well drained and are on foot slopes.
DRAINAGE AND PERMEABILITY: Somewhat poorly drained. Runoff is high. Permeability is moderate and the saturated hydraulic conductivity is moderately high. A seasonal high water table is at about 1.5 to 2 feet in most years. Flooding is rare for very brief periods.
USE AND VEGETATION: These soils are used mainly for pasture and hayland. Native vegetation is mixed hardwoods.
DISTRIBUTION AND EXTENT: The Ozarks Highland region (MLRA 116A) of Missouri and possibly Arkansas. This series is of minor extent.
MLRA SOIL SURVEY REGIONAL OFFICE (MO) RESPONSIBLE: Morgantown, West Virginia.
SERIES ESTABLISHED: Howell County, Missouri soil survey; 2004. The name comes from Lost Pond Valley on the border of Howell and Oregon Counties, Missouri.
REMARKS: Diagnostic horizons and features in this pedon are:
1) Ochric epipedon - from 0 to 8 inches (Ap horizon).
2) Argillic horizon - from a depth of 8 to 80 inches - Bt1, Bt2, 2Bt3, 2Bt4, 2Bt5, and 2Bt6 horizons).
ADDITIONAL DATA: The University of Missouri Soil Characterization Laboratory reference number is S98MO09123.