IDENTIFIERS

  • Current Taxon Name (Soil Name): Mahaska
  • OSD
  • Series Extent
  • User Site ID: S1961IA107001
  • User Pedon ID: S1961IA107001
  • Vegetation Plot ID: S1961IA107001
  • Lab Information:
  • Certified Lab Pedon Description - yes
  • Lab Source ID - SSL
  • Lab Pedon # - 40A1421
  • NCSS Pedon Lab Data NASIS Record ID - 35029
  • Print Date: 1/31/2025

    • 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: 41.4363899
  • Std. Longitude: -91.9936142
  • Datum: WGS84
  • Township: 77N
  • Range: 10W
  • Section: 34
  • PLSS Details: 965 feet south and 278 feet east of NW corner of NE 1/4
  • State: Iowa
  • County: IA107—Keokuk
  • MLRA: 108—Illinois and Iowa Deep Loess and Drift
  • Non-MLRA Soil Survey Area: IA107—Keokuk County, Iowa

    • PEDON

  • Describers Name: D. F. Slusher.
  • Current Taxonomic Class: Fine, smectitic, mesic Aquertic Argiudolls
  • Current Taxon Kind: series
  • Pedon Type: OSD pedon
  • Pedon Purpose: laboratory sampling site
  • Pedon Record Orgin: Converted from PDP 3.x
  • Pedon #: 1
  • Correlated Information:
  • Soil Name - Mahaska (flagged as OSD)
  • PSC - 43 to 93 cm.
  • Classificaton Date - 12/9/2014
  • Soil Taxonomic Edition - twelfth edition
  • Moisture Subclass - aquic
  • Sampled As Information:
  • Soil Name - Mahaska
  • Classificaton Date - 10/2/1961
  • Dynamic Soil Properties:
  • Pedoderm Loose Cover Indicator - no
  • Hydric: no
  • Certification Status: certified
  • QC Status: level 3


    • SITE

  • Landscape: upland
  • Landform: interfluve
  • Slope Shape Down: convex
  • Surface Fragments: 0.00 percent
  • Benchmark Soil?: no

    • VEGETATION

    SITE OBSERVATION

  • Observation Date: 10/2/1961 (actual site observation date)
  • Surface Cover Properties:
  • Site Obs. Cover Kind 1 - crop cover
  • Pedoderm Loose Cover Indicator - no
  • Drained? - no
  • Bedded Soil? - no
  • Forest Plantation? - no
    • Vegetation Plot Plants
    Plant Symbol Scientific Name National Vernacular Name Plant Type Group Canopy Cover % Vegetation Stata Level

    TRIFO

    Trifolium

    clover

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

    mollic epipedon

    argillic horizon

    0—43

    61—155

    36—43—61

    61—94—155
    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

    1

    —

    —

    —

    —

    135

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    —

    —

    —

    —

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    A1p—0 to 18 centimeters (0.0 to 7.1 inches); black (10YR 2/1) and black (10YR 2/1) rubbed and very dark brown (10YR 2/2) rubbed, dark gray (10YR 4/1), dry; silty clay loam; moderate fine angular blocky, and subangular blocky structure; friable; 1 percent worm casts; fragments; abrupt smooth boundary. Lab sample # 40A10961
    A12—18 to 33 centimeters (7.1 to 13.0 inches); black (10YR 2/1), dark gray (10YR 4/1), dry; silty clay loam; moderate fine subangular blocky parts to moderate fine granular structure; friable; 0.5 medium tubular pores; fragments; clear smooth boundary. Lab sample # 40A10962
    A3—33 to 46 centimeters (13.0 to 18.1 inches); very dark gray (10YR 3/1) and black (10YR 2/1), dark gray (10YR 4/1), dry; silty clay loam; moderate fine subangular blocky structure; friable; 0.5 fine tubular pores; fragments; gradual smooth boundary. Lab sample # 40A10963. Few fine hard concretions of an oxide.
    B1—46 to 61 centimeters (18.1 to 24.0 inches); very dark gray (10YR 3/1) and olive brown (2.5Y 4/3) and very dark gray (10YR 3/1) exterior and olive brown (2.5Y 4/3) interior and very dark grayish brown (10YR 3/2) rubbed, gray (10YR 5/1), dry; silty clay loam; 3 percent grayish brown (10YR 5/2) fine distinct mottles; weak medium prismatic parts to moderate fine subangular blocky parts to very fine subangular blocky structure; friable; 0.5 fine tubular pores; fragments; gradual smooth boundary. Lab sample # 40A10964. Many fine hard concretions of an oxide at 18 t0 24 inches.
    B21—61 to 76 centimeters (24.0 to 29.9 inches); dark gray (10YR 4/1) and light olive brown (2.5Y 5/3) and dark gray (10YR 4/1) exterior and light olive brown (2.5Y 5/3) interior and olive brown (2.5Y 4/3) rubbed silty clay loam; 3 percent grayish brown (2.5Y 5/2) fine distinct and 3 percent yellowish brown (10YR 5/8) fine distinct mottles; weak fine prismatic parts to moderate fine subangular blocky structure; friable; 0.5 fine tubular pores; 10 percent very dark gray (10YR 3/1), moist, clay films on faces of peds; fragments; gradual smooth boundary. Lab sample # 40A10965. Faint coatings of silt grains partially imbedded in peds; few fine hard concretions of an oxide.; discontinuous - phpvsfiid 1259093; discontinuous - phpvsfiid 1259093
    B22—76 to 102 centimeters (29.9 to 40.2 inches); dark gray (10YR 4/1) and grayish brown (2.5Y 5/2) and light olive brown (2.5Y 5/3) rubbed silty clay loam; 1 percent yellowish brown (10YR 5/6) fine distinct and 1 percent brown (7.5YR 4/4) medium prominent mottles; moderate medium prismatic parts to strong medium subangular blocky structure; firm; 3.0 very fine tubular pores; 10 percent dark gray (10YR 4/1), moist, clay films on faces of peds and 10 percent oxide coats on faces of peds; fragments; gradual smooth boundary. Lab sample # 40A10966. Prism faces have faint coatings of silt grains partially imbedded in peds; common fine hard concretions of an oxide.
    B31—102 to 130 centimeters (40.2 to 51.2 inches); olive gray (5Y 5/2) and light olive gray (5Y 6/2) and olive gray (5Y 5/2) exterior and light olive gray (5Y 6/2) interior silty clay loam; 1 percent strong brown (7.5YR 5/8) fine and 3 percent yellowish brown (10YR 5/6) fine and medium prominent mottles; weak medium prismatic structure; firm; 21.0 very fine filled with coarse material pores; 10 percent dark gray (10YR 4/1), moist, clay films on faces of peds; fragments; gradual smooth boundary. Lab sample # 40A10967. Few vertical clay flows about 2 to 3 mm. wide on prism faces that are black (10YR 2/1) in color.
    B32—130 to 155 centimeters (51.2 to 61.0 inches); olive gray (5Y 5/2) silty clay loam; 1 percent strong brown (7.5YR 5/8) coarse and 3 percent yellowish brown (10YR 5/6) fine distinct mottles; weak coarse prismatic structure; firm; 21.0 very fine tubular and 0.5 filled with coarse material pores; 30 percent black (10YR 2/1), moist, clay films on vertical faces of peds; fragments; gradual smooth boundary. Lab sample # 40A10968. Few clay flows in vertical pores.; continuous - phpvsfiid 1259097; continuous - phpvsfiid 1259097
    C1—155 to 185 centimeters (61.0 to 72.8 inches); gray (5Y 6/1) silt loam; 3 percent yellowish brown (10YR 5/6) fine distinct mottles; massive; firm; 3.0 very fine tubular pores; 1 percent medium black (10YR 2/1) clay bodies; fragments; abrupt irregular boundary. Lab sample # 40A10969. Few fine soft concretions of an oxide; clay accumulations in vertical pores.
    C2—185 to 198 centimeters (72.8 to 78.0 inches); strong brown (7.5YR 5/8) silt loam; massive; firm; 0.5 fine tubular pores; fragments; clear wavy boundary. Lab sample # 40A10970. Horizons appears to be a horizontal band of strong brown (7.5YR 5/8) with individual layers 1 to 3 inches wide stratified with light olive gray (5Y 6/2) color between bands.
    C3—198 to 229 centimeters (78.0 to 90.2 inches); light olive gray (5Y 6/2) and olive gray (5Y 5/2) exterior silt loam; 3 percent yellowish brown (10YR 5/6) fine distinct mottles; massive; firm; 0.5 tubular pores; 10 percent distinct very dark gray (10YR 3/1), moist, clay films on faces of peds; fragments; diffuse smooth boundary. Lab sample # 40A10971. Few vertical cleavage faces. Common fine distinct segregations of strong brown (7.5YR 5/8); clay films arranged in vertical streaks but some random orientation of clay in pores.
    C4—229 to 320 centimeters (90.2 to 126.0 inches); light olive gray (5Y 6/2) and olive gray (5Y 5/2) exterior silt loam; 3 percent yellowish brown (10YR 5/6) fine distinct mottles; massive; firm; 10 percent distinct very dark gray (10YR 3/1), moist, clay films on faces of peds; fragments; abrupt smooth boundary. Lab sample # 40A10972. Few vertical cleavage faces. Common fine distinct strong brown (7.5YR 5/8) segregations; clay arranged in vertical streaks but some random orientation of clay in pores.
    C5—320 centimeters (126.0 inches); fragments. Lab sample # 40A10973. Farmdale paleosol.