IDENTIFIERS

  • Current Taxon Name (Soil Name): Darwin
  • OSD
  • Series Extent
  • User Site ID: 93IL163010
  • User Pedon ID: 93IL163010
  • Transect:
  • User Transect ID - 93260
  • Transect Stop Number - 10
  • Transect Interval - 200.0
  • Lab Information:
  • Certified Lab Pedon Description - no
  • Print Date: 12/5/2025

    • LOCATION

  • Location Description: No section numbers on quad. T. 1N., R. 10 W. Also, 780 feet northeast along field lane from last tree and 180 feet west of field lane.
  • State: Illinois
  • MLRA: 115—Central Mississippi Valley Wooded Slopes

    • PEDON

  • Describers Name: RAL
  • Current Taxonomic Class: Fine, montmorillonitic Vertic Endoaquolls
  • Current Taxon Kind: series
  • Pedon Type: classifies to current taxon name, full description
  • Pedon Purpose: full pedon description
  • Pedon Record Orgin: Converted from PDP 3.x
  • Sampled As Information:
  • Soil Name - Darwin
  • Taxonomic Class - Fine, montmorillonitic Vertic Endoaquolls
  • PSC - 25 to 102 cm.
  • Classificaton Date - 8/30/1993
  • Moisture Class - aquic
  • Dynamic Soil Properties:
  • Erosion Class - 0
  • Pedoderm Loose Cover Indicator - no
  • Hydric: no


    • SITE

  • Landscape: river valley
  • Landform: flood plain
  • Runoff: low
  • Drainage Class: poorly
  • Flooding: rare flooding
  • Ponding: occasional ponding
  • Surface Fragments:
  • Benchmark Soil?: no

    • VEGETATION

    SITE OBSERVATION

  • Observation Date: 8/30/1993 (actual site observation date)
  • Air Photo ID: 43
  • Surface Cover Properties:
  • Site Obs. Cover Kind 1 - crop 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

    mollic epipedon

    0—41

    —-
    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

    0

    —

    —

    123

    —

    965

    —

    —

    13.9

    —

    —

    —

    —

    —

    —

    —

    —

    —

    —
    Ap—0 to 25 centimeters (0.0 to 9.8 inches); black (10YR 2/1), very dark gray (10YR 3/1), dry; 45 percent clay; moderate fine and medium angular blocky structure; very firm; 7.0 very fine roots and 3.0 fine roots; 1 percent fine spherical strong brown (7.5YR 5/6) masses of oxidized iron; fragments; neutral, pH 6.8, hellige-truog; clear smooth boundary.
    A—25 to 41 centimeters (9.8 to 16.1 inches); very dark gray (10YR 3/1), dark gray (10YR 4/1), dry; 48 percent clay; weak medium prismatic parts to moderate fine and medium angular blocky structure; very firm; 3.0 very fine roots and 0.5 fine roots; fine spherical strong brown (7.5YR 5/6) masses of oxidized iron; fragments; slightly acid, pH 6.2, hellige-truog; clear smooth boundary.
    Bg1—41 to 69 centimeters (16.1 to 27.2 inches); dark gray (5Y 4/1); 51 percent clay; 2 percent yellowish brown (10YR 5/6) fine prominent mottles; weak medium prismatic parts to weak medium angular blocky structure; very firm; 0.5 very fine roots; 35 percent faint dark gray (5Y 4/1) pressure faces on faces of peds; 1 percent fine spherical strong brown (7.5YR 5/6) masses of oxidized iron and 1 percent fine spherical black (N 2/0) iron-manganese masses; fragments; neutral, pH 6.6, hellige-truog; gradual smooth boundary.
    Bg2—69 to 102 centimeters (27.2 to 40.2 inches); dark grayish brown (2.5Y 4/2); 45 percent clay; 15 percent yellowish brown (10YR 5/6) fine prominent mottles; weak medium prismatic structure; very firm; 0.5 very fine roots; 35 percent faint dark grayish brown (2.5Y 4/2) pressure faces on faces of peds; 1 percent fine spherical strong brown (7.5YR 5/6) masses of oxidized iron and 1 percent fine spherical black (N 2/0) iron-manganese masses; fragments; neutral, pH 6.6, hellige-truog; gradual smooth boundary.
    Btg1—102 to 150 centimeters (40.2 to 59.1 inches); grayish brown (2.5Y 5/2); 38 percent clay; 15 percent yellowish brown (10YR 5/6) fine and medium prominent mottles; moderate fine prismatic structure; firm; 0.5 very fine roots; 25 percent distinct dark grayish brown (2.5Y 4/2) clay films on faces of peds; 1 percent fine spherical strong brown (7.5YR 5/6) masses of oxidized iron and 1 percent fine spherical black (N 2/0) iron-manganese masses; fragments; neutral, pH 7.0, hellige-truog; clear smooth boundary.
    Btg2—150 to 180 centimeters (59.1 to 70.9 inches); olive gray (5Y 5/2); 33 percent clay; 6 percent yellowish brown (10YR 5/6) fine prominent mottles; weak medium prismatic structure; firm; 0.5 very fine roots; 1 percent prominent very dark gray (10YR 3/1) clay films in root channels and/or pores and 5 percent faint dark grayish brown (2.5Y 4/2) clay films on faces of peds; 1 percent fine spherical strong brown (7.5YR 5/6) masses of oxidized iron and 2 percent fine spherical black (N 2/0) iron-manganese masses; fragments; neutral, pH 7.2, hellige-truog; clear smooth boundary.
    Cg1—180 to 234 centimeters (70.9 to 92.1 inches); olive gray (5Y 5/2); 21 percent clay; 12 percent yellowish brown (10YR 5/6) fine prominent mottles; massive; friable; 0.5 very fine roots; 1 percent prominent very dark gray (10YR 3/1) clay films in root channels and/or pores; 1 percent fine spherical black (N 2/0) iron-manganese masses and 2 percent fine and medium irregular strong brown (7.5YR 5/6) masses of oxidized iron; fragments; neutral, pH 7.2, hellige-truog; gradual smooth boundary.
    Cg2—234 to 356 centimeters (92.1 to 140.2 inches); olive gray (5Y 5/2); 32 percent clay; 1 percent yellowish brown (10YR 5/6) fine prominent mottles; massive; firm; 1 percent prominent very dark gray (10YR 3/1) clay films in root channels and/or pores; 2 percent fine irregular black (N 2/0) iron-manganese masses and 3 percent fine and medium irregular strong brown (7.5YR 5/6) masses of oxidized iron; fragments; neutral, pH 7.2, hellige-truog.