IDENTIFIERS

  • Current Taxon Name (Soil Name): Clarksville
  • OSD
  • Series Extent
  • User Site ID: 1992MO123025M
  • User Pedon ID: 1992MO123025M
  • Lab Information:
  • Certified Lab Pedon Description - no
  • Lab Source ID - MCL
  • Lab Pedon # - M9212325
  • NCSS Pedon Lab Data NASIS Record ID - 26851
  • Print Date: 3/31/2025

    • LOCATION

  • Location In Web Soil Survey
  • AOI is roughly a square mile and pedon is marked in the center.
  • Location in SoilWeb
  • Location in Google Maps
  • Std. Latitude: 37.3320847
  • Std. Longitude: -90.2279129
  • Datum: WGS84
  • Township: T31N
  • Range: R7E
  • Section: 25
  • PLSS Details: 575 feet N and 2280 feet E of the SW corner
  • Location Description: 575 ft. N. and 2280 ft. E. of the SW corner of sec. 25, T. 31 N., R. 7 E.
  • Map Unit: 73140—Clarksville-Scholten complex, 15 to 45 percent slopes, very stony13F—Clarksville very gravelly silt loam, 20 to 35 percent slopes
  • State: Missouri
  • County: MO123—Madison
  • MLRA: 116A—Ozark Highland
  • Non-MLRA Soil Survey Area: MO123—Madison County, Missouri
  • 7.5 Minute USGS Quad: 37090-C2—Allbright, Missouri

    • PEDON

  • Describers Name: KEB, MLC AND CGM
  • Current Taxonomic Class: Loamy-skeletal, siliceous, semiactive, mesic Typic Paleudults
  • Current Taxon Kind: series
  • Pedon Type: classifies to current taxon name, full description
  • Pedon Purpose: laboratory sampling site
  • Pedon Record Orgin: Converted from PDP 3.x
  • Correlated Information:
  • Soil Name - Clarksville
  • PSC - 26 to 76 cm.
  • Classificaton Date - 2/25/2011
  • Soil Taxonomic Edition - eighth edition
  • Moisture Class - udic
  • Sampled As Information:
  • Soil Name - Clarksville
  • Taxonomic Class - Loamy-skeletal, siliceous, semiactive, mesic Typic Paleudults
  • Taxon Kind - series
  • PSC - 26 to 76 cm.
  • Classificaton Date - 10/26/1992
  • Dynamic Soil Properties:
  • Erosion Class - 1
  • Pedoderm Loose Cover Indicator - no
  • Hydric: no


    • SITE

  • Parent Material: slope alluvium derived from cherty limestone
  • Landscape: plateau
  • Landform: valley side
  • Runoff: high
  • Drainage Class: somewhat excessively
  • Flooding: none flooding
  • Ponding: none ponding
  • Surface Fragments:
  • Benchmark Soil?: no

    • VEGETATION

    SITE OBSERVATION

  • Observation Date: 10/26/1992 (actual site observation date)
  • Air Photo ID: D-9
  • Surface Cover Properties:
  • Site Obs. Cover Kind 1 - tree cover
  • Pedoderm Loose Cover Indicator - no
  • Drained? - no
  • Bedded Soil? - no
  • Forest Plantation? - no
  • Site Erosion Accelerated: water erosion
    • Pedon Diagnostic Features
    Feature Kind Feature Depth L-H Feature Thickness L-RV-H
    cm

    ochric epipedon

    argillic horizon

    3—23

    23—203

    —-

    —-
    Setting and Climate
    Slope Slope Length USLE Upslope Length Elev. Corr. Elev Aspect MAP REAP FFD MAAT MSAT MWAT MAST MSST MWST MFFP PE Index Climate Station ID Climate Station Name Climate Station Type
    % m degrees mm mm C mm

    21

    —

    —

    168

    —

    50

    —

    —

    —

    —

    —

    —

    —

    —

    —

    —

    —

    —

    —

    —
    Oi—0 to 3 centimeters (0.0 to 1.2 inches); slightly decomposed plant material; fragments.
    A—3 to 11 centimeters (1.2 to 4.3 inches); dark brown (10YR 3/3), brown (10YR 5/3), dry; silt loam; moderate very fine subangular blocky, and moderate fine granular structure; very friable; 3.0 medium and coarse roots and 10.0 fine roots; 12 percent by volume 2-39-75 millimeter unspecified fragments; neutral, pH 6.7, hellige-truog; abrupt wavy boundary. Lab sample # MU012404
    E—11 to 26 centimeters (4.3 to 10.2 inches); dark yellowish brown (10YR 4/4), light yellowish brown (10YR 6/4), dry; silt loam; moderate very fine subangular blocky structure; friable; 0.5 medium and coarse roots and 3.0 fine roots; 12 percent by volume 2-39-75 millimeter unspecified fragments; moderately acid, pH 5.6, hellige-truog; clear wavy boundary. Lab sample # MU012405. Some mixing from above horizon.
    Bt1—26 to 41 centimeters (10.2 to 16.1 inches); brown (7.5YR 4/4) silt loam; moderate very fine subangular blocky structure; friable; 0.5 medium and coarse roots and 3.0 fine roots; 15 percent faint clay films; 8 percent by volume 2-39-75 millimeter unspecified fragments; strongly acid, pH 5.1, hellige-truog; clear wavy boundary. Lab sample # MU012406
    Bt2—41 to 56 centimeters (16.1 to 22.0 inches); strong brown (7.5YR 4/6) gravelly silty clay loam; moderate very fine subangular blocky structure; friable; 0.5 medium and coarse roots and 3.0 fine roots; 35 percent faint clay films; 1 percent by volume 75-162-250 millimeter unspecified fragments and 31 percent by volume 2-39-75 millimeter unspecified fragments; strongly acid, pH 5.1, hellige-truog; clear wavy boundary. Lab sample # MU012407
    Bt3—56 to 77 centimeters (22.0 to 30.3 inches); strong brown (7.5YR 4/6) very gravelly silty clay loam; moderate very fine subangular blocky structure; friable; 0.1 fine and medium roots; on rock fragments and 4 percent manganese or iron-manganese stains on faces of peds and 35 percent distinct clay films; 1 percent by volume 75-162-250 millimeter unspecified fragments and 56 percent by volume 2-39-75 millimeter unspecified fragments; very strongly acid, pH 5.0, hellige-truog; gradual wavy boundary. Lab sample # MU012408. A boulder or ledge rock was observed at the base of the horizon; this may have been filling from upslope.
    Bt4—77 to 100 centimeters (30.3 to 39.4 inches); reddish brown (5YR 4/4) and light brown (7.5YR 6/4) extremely gravelly clay loam; moderate very fine subangular blocky structure; friable; 0.5 fine and medium roots; on rock fragments and 4 percent distinct silt coats and 15 percent distinct manganese or iron-manganese stains on faces of peds; 3 percent by volume 75-162-250 millimeter unspecified fragments and 61 percent by volume 2-39-75 millimeter unspecified fragments; strongly acid, pH 5.1, hellige-truog; gradual wavy boundary. Lab sample # MU012409. The third parent material appears to be residuum with Cr material, below colluvium. Coarse fragments are 60 percent chert and 40 percent sandstone.
    Bt5—100 to 135 centimeters (39.4 to 53.1 inches); yellowish red (5YR 4/6) and red (2.5YR 4/8) extremely gravelly clay loam; moderate very fine subangular blocky structure; friable; 0.1 fine roots; 4 percent distinct silt coats and 15 percent manganese or iron-manganese stains and 75 percent distinct clay films; 2 percent by volume 75-162-250 millimeter unspecified fragments and 71 percent by volume 2-39-75 millimeter unspecified fragments; very strongly acid, pH 4.9, hellige-truog; gradual wavy boundary. Lab sample # MU012410
    Bt6—135 to 163 centimeters (53.1 to 64.2 inches); red (2.5YR 4/8) and yellowish red (5YR 5/6) extremely gravelly clay loam; moderate very fine subangular blocky structure; friable; 4 percent distinct silt coats and 14 percent prominent on vertical faces of peds and 15 percent manganese or iron-manganese stains and 75 percent distinct clay films; 2 percent by volume 75-162-250 millimeter unspecified fragments and 65 percent by volume 2-39-75 millimeter unspecified fragments; very strongly acid, pH 4.9, hellige-truog; gradual wavy boundary. Lab sample # MU012411. Few siltstone fragments were observed in this horizon.
    2Bt7—163 to 206 centimeters (64.2 to 81.1 inches); yellowish red (5YR 5/6) and reddish yellow (7.5YR 6/6) extremely gravelly clay; moderate very fine subangular blocky structure; friable; prominent and 35 percent distinct clay films and 35 percent manganese or iron-manganese stains; 2 percent by volume 75-162-250 millimeter unspecified fragments and 63 percent by volume 2-39-75 millimeter unspecified fragments; very strongly acid, pH 5.0, hellige-truog. Lab sample # MU012412. Pockets of siltstone were observed in this horizon.