IDENTIFIERS

  • Current Taxon Name (Soil Name): Hurst
  • OSD
  • Series Extent
  • User Site ID: 93IL163008
  • User Pedon ID: 93IL163008
  • Transect:
  • User Transect ID - 93348
  • Transect Stop Number - 10
  • Transect Interval - 100.0
  • Lab Information:
  • Certified Lab Pedon Description - no
  • Print Date: 12/5/2025

    • LOCATION

  • Location Description: 2,300 feet west and 950 feet south of the northeast corner of section 26, T. 3 S., R. 7 W. Also, 64 yards north of middle red shed.
  • State: Illinois
  • County: IL163—St. Clair
  • MLRA: 114—Southern Illinois and Indiana Thin Loess and Till Plain

    • PEDON

  • Describers Name: RAL
  • Current Taxonomic Class: Fine, montmorillonitic Aeric Endoaqualfs
  • Pedon Type: representative pedon for component
  • Pedon Purpose: full pedon description
  • Pedon Record Orgin: Converted from PDP 3.x
  • Sampled As Information:
  • Soil Name - Hurst
  • Taxonomic Class - Fine, montmorillonitic Aeric Endoaqualfs
  • PSC - 36 to 86 cm.
  • Classificaton Date - 9/2/1993
  • Moisture Class - aquic
  • Dynamic Soil Properties:
  • Erosion Class - 1
  • Pedoderm Loose Cover Indicator - no
  • Hydric: no


    • SITE

  • Landscape: plains
  • Landform: lake terrace
  • Hill Slope Profile: summit
  • Runoff: low
  • Drainage Class: somewhat poorly
  • Flooding: none flooding
  • Ponding: none ponding
  • Surface Fragments:
  • Benchmark Soil?: no

    • VEGETATION

    SITE OBSERVATION

  • Observation Date: 9/2/1993 (actual site observation date)
  • Air Photo ID: 99
  • 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

    ochric epipedon

    anthropic epipedon

    argillic horizon

    0—23

    23—36

    36—249

    —-

    —-

    —-
    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

    —

    —

    126

    —

    965

    —

    —

    13.9

    —

    —

    —

    —

    —

    —

    —

    —

    —

    —
    Ap—0 to 23 centimeters (0.0 to 9.1 inches); dark grayish brown (10YR 4/2), light brownish gray (10YR 6/2), dry; 21 percent clay; weak fine granular structure; friable; 3.0 very fine roots throughout and 0.5 fine roots throughout; 1 percent fine spherical strong brown (7.5YR 5/6) masses of oxidized iron and 3 percent fine and medium spherical black (N 2/0) iron-manganese masses; fragments; neutral, pH 6.8, hellige-truog; abrupt wavy boundary.
    E—23 to 36 centimeters (9.1 to 14.2 inches); grayish brown (10YR 5/2), light gray (10YR 7/2), dry; 20 percent clay; 1 percent yellowish brown (10YR 5/4) fine distinct spherical mottles; moderate medium platy parts to weak fine granular structure; friable; 0.5 very fine roots throughout; 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; slightly acid, pH 6.2, hellige-truog; abrupt smooth boundary.
    Bt1—36 to 48 centimeters (14.2 to 18.9 inches); brown (10YR 5/3); 30 percent clay; 2 percent yellowish brown (10YR 5/6) fine distinct spherical mottles; moderate very fine subangular blocky structure; friable; 3.0 very fine roots between peds; 60 percent prominent light gray (10YR 7/2), dry, silt coats on faces of peds and 75 percent distinct dark grayish brown (10YR 4/2) clay films on faces of peds; 2 percent fine irregular black (N 2/0) iron-manganese masses; fragments; moderately acid, pH 6.0, hellige-truog; abrupt smooth boundary.
    2Bt2—48 to 91 centimeters (18.9 to 35.8 inches); light olive brown (2.5Y 5/3); 45 percent clay; 5 percent strong brown (7.5YR 5/6) fine prominent and 12 percent grayish brown (2.5Y 5/2) fine and medium distinct mottles; weak fine platy parts to weak medium subangular blocky structure; firm; 0.5 very fine roots between peds; 25 percent faint brown (10YR 4/3) clay films on faces of peds; 2 percent fine and medium irregular black (N 2/0) iron-manganese masses; fragments; very strongly acid, pH 4.8, hellige-truog; clear smooth boundary. This parent material change at 19 inches is marked by a large increase in clay content, a sharp decrease in pH, the presence of reddish iron concentrations, and many silt coats just above the break.
    2Bt3—91 to 124 centimeters (35.8 to 48.8 inches); light olive brown (2.5Y 5/3); 38 percent clay; 5 percent grayish brown (2.5Y 5/2) fine faint and 8 percent strong brown (7.5YR 5/6) fine prominent mottles; weak fine prismatic parts to weak medium subangular blocky structure; firm; 0.5 very fine roots between peds; 20 percent faint dark grayish brown (2.5Y 4/2) clay films on faces of peds; 2 percent fine and medium spherical black (N 2/0) iron-manganese masses; fragments; very strongly acid, pH 4.8, hellige-truog; clear smooth boundary.
    2Bt4—124 to 173 centimeters (48.8 to 68.1 inches); olive (5Y 5/3); 36 percent clay; 3 percent strong brown (7.5YR 5/6) fine prominent mottles; weak medium prismatic parts to moderate fine and medium angular blocky structure; firm; 0.5 very fine roots between peds; 1 percent prominent very dark grayish brown (10YR 3/2) clay films in root channels and/or pores and 5 percent prominent light gray (10YR 7/2), dry, silt coats on faces of peds and 15 percent distinct dark grayish brown (2.5Y 4/2) clay films on faces of peds; 15 percent fine and medium irregular black (N 2/0) iron-manganese masses; fragments; neutral, pH 6.8, hellige-truog; clear smooth boundary.
    2Bt5—173 to 249 centimeters (68.1 to 98.0 inches); olive (5Y 5/3); 29 percent clay; 2 percent strong brown (7.5YR 5/6) fine prominent mottles; weak medium prismatic parts to weak medium subangular blocky structure; firm; 1 percent prominent very dark grayish brown (10YR 3/2) clay films in root channels and/or pores and 11 percent distinct dark grayish brown (2.5Y 4/2) clay films on faces of peds; 3 percent fine and medium irregular yellowish red (5YR 5/6) masses of oxidized iron and 5 percent fine and medium irregular black (N 2/0) iron-manganese masses; 1 percent coarse spherical light gray (10YR 7/2) carbonate nodules in cracks; fragments; strong effervescence, by hcl, unspecified; slightly alkaline, pH 7.6, hellige-truog; abrupt smooth boundary. The pH rises from 4.8 to 7.6 in the lower part of the lacustrine sediments indicating sodium may be present. Carbonate nodules are present in the 68 to 98-inch horizon. Darmstadt soils are nearby.
    3BCg—249 to 320 centimeters (98.0 to 126.0 inches); olive gray (5Y 5/2); 25 percent clay; 10 percent strong brown (7.5YR 5/6) fine and medium prominent mottles; weak medium prismatic parts to weak medium subangular blocky structure; friable; 1 percent prominent very dark grayish brown (10YR 3/2) clay films in root channels and/or pores and 5 percent distinct dark grayish brown (2.5Y 4/2) clay films on faces of peds; 1 percent fine spherical black (N 2/0) iron-manganese masses and 2 percent fine irregular strong brown (7.5YR 5/6) masses of oxidized iron; fragments; slightly alkaline, pH 7.6, hellige-truog; clear smooth boundary. This horizon is the grayish-brown member of the Roxana Silts.
    4Btb—320 to 345 centimeters (126.0 to 135.8 inches); brown (10YR 5/3); 26 percent clay; 5 percent strong brown (7.5YR 5/6) fine prominent mottles; weak fine prismatic structure; friable; 3 percent prominent very dark gray (10YR 3/1) clay films in root channels and/or pores and 10 percent prominent very dark grayish brown (2.5Y 3/2) clay films on faces of peds; 2 percent fine and medium 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; slightly alkaline, pH 7.6, hellige-truog; clear smooth boundary.
    4C—345 to 422 centimeters (135.8 to 166.1 inches); brown (7.5YR 5/4); 31 percent clay; 30 percent strong brown (7.5YR 5/8) medium and coarse distinct mottles; massive; firm; 3 percent prominent dark brown (7.5YR 3/2) 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 yellowish red (5YR 5/6) masses of oxidized iron; fragments; slightly alkaline, pH 7.6, hellige-truog. The last 2 horizons are the pinkish-colored member of the Roxana Silts.