IDENTIFIERS

  • Current Taxon Name (Soil Name): Clarksville
  • OSD
  • Series Extent
  • User Site ID: 2006MO203002M
  • User Pedon ID: 2006MO203002M
  • Vegetation Plot ID: 2006MO203002
  • Lab Information:
  • Certified Lab Pedon Description - yes
  • Lab Source ID - MCL
  • Lab Pedon # - M0620302
  • NCSS Pedon Lab Data NASIS Record ID - 25265
  • User Project ID: 2021-26NCSPR013
  • Project Name: MLRA 116A - Mark Twain National Forest Update
  • Print Date: 12/5/2025

    • 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: 36.9573250
  • Std. Longitude: -91.2696389
  • Datum: WGS84
  • Township: T26N
  • Range: R3W
  • Section: 3
  • PLSS Details: 1628 feet E and 150 feet S of the NW corner
  • Map Unit: 73014—Clarksville very gravelly silt loam, 8 to 15 percent slopes
  • State: Missouri
  • County: MO203—Shannon
  • MLRA: 116A—Ozark Highland
  • MLRA Soil Survey Area: NC-SPM—Springfield, Missouri
  • Non-MLRA Soil Survey Area: MO601—Mark Twain National Forest Area, MissouriMO203—Shannon County, Missouri
  • 7.5 Minute USGS Quad: 36091-H3—Low Wassie, Missouri

    • PEDON

  • Describers Name: Leon Thompson, Dan Childress, Dennis Meinert, Jennifer Pellett
  • Current Taxonomic Class: Loamy-skeletal, siliceous, active, mesic Typic Paleudults
  • Current Taxon Kind: taxadjunct
  • Pedon Type: taxadjunct to the series
  • Pedon Purpose: laboratory sampling site
  • Pedon Record Orgin: Missouri Pedon
  • Pedon #: 2
  • Correlated Information:
  • Soil Name - Clarksville
  • PSC - 41 to 91 cm.
  • Classificaton Date - 10/29/2018
  • Classifier - J.R. Perkins
  • Soil Taxonomic Edition - twelfth edition
  • Moisture Class - udic
  • Moisture Subclass - typic
  • Sampled As Information:
  • Soil Name - Captina
  • Taxonomic Class - Fine-silty, siliceous, active, mesic Typic Fragiudults
  • Taxon Kind - series
  • PSC - 25 to 75 cm.
  • Classificaton Date - 8/15/2006
  • Soil Taxonomic Edition - twelfth edition
  • Moisture Class - udic
  • Moisture SUBClass - typic
  • Dynamic Soil Properties:
  • Erosion Class - 1
  • Pedoderm Loose Cover Indicator - no
  • Hydric: no
  • Certification Status: certified
  • QC Status: level 1
  • Field Measured Properties: 15 percent of pscs clay and 38.1 percent of pscs sand and 48.2 percent of pscs gravel and 0.42 ratio of cec to clay ratio


    • SITE

  • Parent Material: clayey residuum weathered from limestone and sandstone and/or slope alluvium derived from mixed
  • Landscape: hills
  • Landform: hillslope
  • Geomorphic Component Hills: side slope
  • Hill Slope Profile: backslope
  • Slope Position: lower third
  • Slope Complexity: simple
  • Slope Shape Across: concave
  • Slope Shape Down: convex
  • Runoff: low
  • Drainage Class: somewhat excessively
  • Flooding: none flooding
  • Ponding: none ponding
  • Geology: Roubidoux Formation formation.
  • Surface Fragments:
  • Benchmark Soil?: no

    • VEGETATION

    SITE OBSERVATION

  • Observation Date: 8/15/2006 (actual site observation date)
  • Air Photo ID: 36091h3ne
  • Surface Water Kind: none observed
  • Surface Cover Properties:
  • Site Obs. Cover Kind 1 - tree cover
  • Site Obs. Cover Kind 2 - hardwoods
  • Pedoderm Loose Cover Indicator - no
  • Drained? - no
  • Bedded Soil? - no
  • Forest Plantation? - no
  • Site Erosion Accelerated: water erosion sheet
    • Vegetation Plot Plants
    Plant Symbol Scientific Name National Vernacular Name Plant Type Group Canopy Cover % Vegetation Stata Level

    PIEC2

    PAQU2

    VITIS

    DESMO

    Pinus echinata

    Parthenocissus quinquefolia

    Vitis

    Desmodium

    shortleaf pine

    Virginia creeper

    grape

    ticktrefoil

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    Pedon Diagnostic Features
    Feature Kind Feature Depth L-H Feature Thickness L-RV-H
    cm

    ochric epipedon

    argillic horizon

    strongly contrasting particle size class

    0—41

    41—190

    99—

    —41—

    —149—

    —91—
    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

    27

    —

    —

    289

    —

    265

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    A—0 to 8 centimeters (0.0 to 3.1 inches); very dark grayish brown (10YR 3/2) rubbed very cobbly silt loam; moderate fine and medium granular structure; very friable; 10.0 medium roots throughout and 10.0 fine roots throughout and 10.0 coarse roots throughout; 10.0 very fine moderate-continuity interstitial pores; 10 percent by volume nonflat subangular very strongly coherent cemented 2-?-75 millimeter quartzite fragments and 15 percent by volume nonflat subangular moderately coherent cemented 75-?-250 millimeter sandstone, unspecified fragments and 20 percent by volume nonflat subangular very strongly coherent cemented 2-?-75 millimeter chert fragments; clear smooth boundary. Lab sample # MU000972; observed in pit, small
    E—8 to 25 centimeters (3.1 to 9.8 inches); yellowish brown (10YR 5/4) exterior very gravelly silt loam; weak very fine subangular blocky structure; friable; 0.5 very coarse roots throughout and 10.0 medium roots throughout and 10.0 fine roots throughout and 10.0 coarse roots throughout; 10.0 fine moderate-continuity tubular pores; 5 percent distinct dark yellowish brown (10YR 4/4), moist, organic stains on all faces of peds; 20 percent by volume nonflat subangular very strongly coherent cemented 2-?-75 millimeter chert fragments and 20 percent by volume nonflat subangular moderately coherent cemented 2-?-75 millimeter sandstone, unspecified fragments; clear smooth boundary. Lab sample # MU000973; observed in pit, small
    BE—25 to 41 centimeters (9.8 to 16.1 inches); light yellowish brown (10YR 6/4) exterior gravelly silt loam; moderate fine and medium subangular blocky structure; friable; 0.5 very coarse roots throughout and 10.0 medium roots throughout and 10.0 fine roots throughout and 10.0 coarse roots throughout; 10.0 very fine moderate-continuity tubular and 10.0 fine moderate-continuity tubular pores; 1 percent faint strong brown (7.5YR 4/6), moist, clay films on surfaces along pores and 70 percent faint light yellowish brown (10YR 6/4), moist, silt coats on all faces of peds; 5 percent by volume nonflat subangular very strongly coherent cemented 2-?-75 millimeter quartzite fragments and 20 percent by volume nonflat subangular very strongly coherent cemented 2-?-75 millimeter chert fragments; clear smooth boundary. Lab sample # MU000974; observed in pit, small
    Bt1—41 to 64 centimeters (16.1 to 25.2 inches); 60 percent yellowish red (5YR 5/6) exterior and 20 percent yellowish red (5YR 4/6) exterior and 20 percent strong brown (7.5YR 5/6) exterior very gravelly loam; moderate fine and medium subangular blocky structure; friable; 3.0 medium roots throughout and 3.0 fine roots throughout and 0.5 coarse roots throughout; 0.5 medium moderate-continuity tubular and 10.0 fine moderate-continuity tubular pores; 5 percent faint yellowish red (5YR 4/6), moist, clay films on all faces of peds and 75 percent faint strong brown (7.5YR 4/6), moist, silt coats on all faces of peds; 5 percent by volume nonflat subangular moderately coherent cemented 75-?-250 millimeter sandstone, unspecified fragments and 10 percent by volume nonflat subangular moderately coherent cemented 2-?-75 millimeter sandstone, unspecified fragments and 25 percent by volume nonflat subangular very strongly coherent cemented 2-?-75 millimeter chert fragments; clear smooth boundary. Lab sample # MU000975; observed in pit, small
    Bt2—64 to 99 centimeters (25.2 to 39.0 inches); yellowish red (5YR 4/6) exterior very gravelly loam; weak fine subangular blocky structure; firm; 0.5 medium roots throughout and 0.5 fine roots throughout and 0.5 coarse roots throughout; 3.0 very fine moderate-continuity interstitial and 3.0 fine moderate-continuity interstitial pores; 12 percent faint red (2.5YR 4/6), moist, clay films on all faces of peds and 40 percent faint strong brown (7.5YR 5/6), moist, silt coats on all faces of peds and 70 percent faint yellowish red (5YR 5/6), moist, clay films on all faces of peds; 15 percent by volume nonflat subangular very strongly coherent cemented 75-?-250 millimeter chert fragments and 40 percent by volume nonflat subangular very strongly coherent cemented 2-?-75 millimeter chert fragments; clear wavy boundary. Lab sample # MU000976; observed in pit, small
    2Bt3—99 to 132 centimeters (39.0 to 52.0 inches); 75 percent red (2.5YR 4/6) exterior and 10 percent red (10R 4/8) exterior and 15 percent yellowish red (5YR 5/6) exterior very gravelly clay; moderate medium angular blocky, and moderate coarse subangular blocky, and strong medium subangular blocky structure; very firm; 0.5 medium roots throughout and 0.5 fine roots throughout; 3.0 fine moderate-continuity interstitial pores; 10 percent prominent strong brown (7.5YR 5/6), moist, silt coats on all faces of peds and 70 percent distinct red (2.5YR 4/6), moist, clay films on all faces of peds; 10 percent by volume nonflat subangular very strongly coherent cemented 75-?-250 millimeter chert fragments and 30 percent by volume nonflat angular very strongly coherent cemented 2-?-75 millimeter chert fragments; clear wavy boundary. Lab sample # MU000977; observed in pit, small
    2Bt4—132 to 165 centimeters (52.0 to 65.0 inches); 70 percent red (2.5YR 4/6) exterior and 20 percent yellowish red (5YR 5/6) exterior and 10 percent strong brown (7.5YR 5/6) exterior very cobbly clay; strong medium and coarse subangular blocky structure; very firm; 0.5 medium roots throughout and 0.9 fine roots throughout; 0.5 very fine moderate-continuity tubular and 3.0 fine moderate-continuity interstitial pores; 35 percent faint red (2.5YR 4/6), moist, clay films on all faces of peds; 20 percent by volume nonflat angular very strongly coherent cemented 75-?-250 millimeter chert fragments and 30 percent by volume nonflat angular very strongly coherent cemented 2-?-75 millimeter chert fragments; gradual wavy boundary. Lab sample # MU000978; observed in pit, small
    2Bt5—165 to 190 centimeters (65.0 to 74.8 inches); 70 percent red (2.5YR 4/6) exterior and 10 percent strong brown (7.5YR 5/8) exterior and 20 percent yellowish red (5YR 5/6) exterior extremely cobbly clay; moderate medium angular blocky structure; very firm; 0.9 very fine roots throughout; 0.5 fine moderate-continuity interstitial pores; 35 percent faint red (2.5YR 4/6), moist, clay films on all faces of peds; 30 percent by volume nonflat angular very strongly coherent cemented 2-?-75 millimeter chert fragments and 30 percent by volume nonflat angular very strongly coherent cemented 75-?-250 millimeter chert fragments. Lab sample # MU000979; observed in pit, small