IDENTIFIERS

  • Current Taxon Name (Soil Name): Marna
  • OSD
  • Series Extent
  • User Site ID: S1964IA187001
  • User Pedon ID: S1964IA187001
  • Lab Information:
  • Certified Lab Pedon Description - yes
  • Lab Source ID - SSL
  • Lab Pedon # - 40A1490
  • NCSS Pedon Lab Data NASIS Record ID - 35098
  • Print Date: 11/21/2024

    • 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: 42.2361107
  • Std. Longitude: -94.0638885
  • Datum: WGS84
  • Township: 86N
  • Range: 28W
  • Section: 25
  • PLSS Details: 1041 feet S and 790 feet E of the NW corner
  • State: Iowa
  • County: IA187—Webster
  • MLRA: 103—Central Iowa and Minnesota Till Prairies
  • Non-MLRA Soil Survey Area: IA187—Webster County, Iowa

    • PEDON

  • Describers Name: R.I. Dideriksen, C.S. Fisher, M.P. Koppen, G.T. Carlson, and L.I. Harmon
  • Current Taxonomic Class: Fine, smectitic, mesic Vertic Endoaquolls
  • Current Taxon Kind: series
  • Pedon Purpose: soil survey inventory
  • Pedon Record Orgin: Converted from PDP 3.x
  • Pedon #: 1
  • Correlated Information:
  • Soil Name - Marna
  • Classificaton Date - 1/13/2015
  • Moisture Subclass - aquic
  • Sampled As Information:
  • Soil Name - Marna
  • Classificaton Date - 9/14/1964
  • Dynamic Soil Properties:
  • Pedoderm Loose Cover Indicator - no
  • Hydric: yes
  • Certification Status: certified
  • QC Status: level 1
  • QA Status: not reviewed


    • SITE

  • Landscape: till plain
  • Drainage Class: poorly
  • Surface Fragments:
  • Benchmark Soil?: no

    • VEGETATION

    SITE OBSERVATION

  • Observation Date: 9/14/1964 (actual site observation date)
  • Surface Cover Properties:
  • Site Obs. Cover Kind 1 - crop cover
  • Site Obs. Cover Kind 2 - row crop
  • Pedoderm Loose Cover Indicator - no
  • Drained? - no
  • Bedded Soil? - no
  • Forest Plantation? - no
    • 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
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    Ap1—0 to 15 centimeters (0.0 to 5.9 inches); black (N 2/0) and black (10YR 2/1) crushed, black (10YR 2/1) and very dark gray (10YR 3/1), dry; silty clay loam; strong medium angular blocky parts to moderate fine subangular blocky structure; firm; 37 percent black (10YR 2/1) oxide coats; fragments; slightly acid, pH 6.2, unspecified; clear smooth boundary. Lab sample # 40A11616. clean sand grains are evident; the structure has some vertical orientation probably due to drying.
    Ap2—15 to 25 centimeters (5.9 to 9.8 inches); firm; fragments; slightly acid, pH 6.2, unspecified; abrupt smooth boundary. Lab sample # 40A11617. Color, texture, and structure similar to Ap1 horizon; clean sand grains are evident; the structure is due to plow layer compaction and drying.
    A12—25 to 35 centimeters (9.8 to 13.8 inches); moderate very fine granular, and very fine subangular blocky structure; friable; fragments; slightly acid, pH 6.2, unspecified; clear smooth boundary. Lab sample # 40A11618. color same as above; few 1/8 inch or smaller pebbles.
    B1—35 to 50 centimeters (13.8 to 19.7 inches);, dark gray (10YR 4/1), dry; moderate very fine and fine subangular blocky structure; firm; 3.0 tubular pores; 3 percent brown (7.5YR 4/4) oxide coats; fragments; neutral, pH 6.6, unspecified; clear smooth boundary. Lab sample # 40A11619. color and texture as above except for dry color; few very dark gray (5Y 3/1) peds in lower part of horizon; few 1/8 inch and smaller pebbles; sand grains are evident.
    B21—50 to 65 centimeters (19.7 to 25.6 inches); olive gray (5Y 5/2) and dark gray (5Y 4/1) silty clay, clay; strong coarse prismatic parts to medium prismatic parts to strong very fine and fine subangular blocky structure; very firm; 0.5 tubular pores; distinct clay films and very dark gray (10YR 3/1) on faces of peds and black (10YR 2/1) on faces of peds and 15 percent dark brown (7.5YR 3/2) oxide coats; fragments; neutral, pH 7.2, unspecified; gradual smooth boundary. Lab sample # 40A11620. very few 1/4 inch pebbles and some sand grains.; continuous - phpvsfiid 1261070; continuous - phpvsfiid 1261070
    B22g—65 to 80 centimeters (25.6 to 31.5 inches); 70 percent very dark gray (5Y 3/1) and 30 percent black (10YR 2/1) silty clay; prominent clay films on faces of peds and 3 percent light olive brown (2.5Y 5/4) oxide coats and 3 percent dark yellowish brown (10YR 4/4) oxide coats and 15 percent black (10YR 2/1) oxide coats; fragments; neutral, pH 7.2, unspecified; gradual smooth boundary. Lab sample # 40A11621. colors as above; structure and consistence similar to B21 horizon; pores as above; few fragments of shale and rotted stones; few sand grains; prism faces are about 30 degrees from the horizontal and appear to have fewer pores than vertical faces.; continuous - phpvsfiid 1387874; continuous - phpvsfiid 1387874
    B23g—80 to 103 centimeters (31.5 to 40.6 inches); 50 percent olive gray (5Y 5/2) and 30 percent very dark gray (5Y 3/1) and 20 percent black (10YR 2/1) silty clay loam; yellowish brown (10YR 5/6) and 10 percent light olive brown (2.5Y 5/4) fine mottles; firm; 10.0 fine tubular pores; prominent clay films and faint clay films on vertical faces of peds and 15 percent black (10YR 2/1) oxide coats; fragments; slightly alkaline, pH 7.8, unspecified; clear wavy boundary. Lab sample # 40A11622. colors similar to B22g horizon; structure as above; prisms have faces 30 degrees from horizontal; clay films with somewhat grainy appearance; some of larger prisms faces have colors that are very dark gray (5Y 3/1) and black (10YR 2/1); smaller faces are olive gray (5Y 5/2) and very dark gray (10YR 3/1); few 1/2 inch pebbles.; continuous - phpvsfiid 1387878; continuous - phpvsfiid 1387878
    2B31g—103 to 115 centimeters (40.6 to 45.3 inches); dark gray (5Y 4/1) clay loam; weak coarse prismatic parts to weak medium and coarse subangular blocky structure; firm; 10.0 tubular pores; fragments; slight effervescence; moderately alkaline, pH 7.9, unspecified; gradual wavy boundary. Lab sample # 40A11623. color similar to B23g horizon; mottles as above; few pores coated with very dark gray (10YR 3/1) clay; some 1 to 1.5 inch lime rocks; few pebbles; few shale rocks; glacial till; vertical faces are high is lime.
    2B32g—115 to 125 centimeters (45.3 to 49.2 inches); loam; friable; 10.0 tubular pores; 15 percent dark gray (10YR 4/1) coats on faces of peds and 15 percent very dark gray (10YR 3/1) coats in root channels and/or pores and 15 percent black (10YR 2/1) oxide coats; fragments; strong effervescence; moderately alkaline, pH 8.2, unspecified; gradual wavy boundary. Lab sample # 40A11624. colors similar to 2B31g horizon; mottles and structure as above; some pebbles; some lime segregated along pores, roots, and large prism faces; several old krotovinas in the pit at this depth and below.
    2B33—125 to 140 centimeters (49.2 to 55.1 inches); olive gray (5Y 5/2) and yellowish brown (10YR 5/6) loam; weak very coarse prismatic structure; friable; 10.0 fine and medium tubular pores; 15 percent very dark gray (10YR 3/1) coats in root channels and/or pores; fragments; strong effervescence; moderately alkaline, pH 8.2, unspecified; gradual smooth boundary. Lab sample # 40A11625. distinct lime on large vertical faces; also prominent filament lime along pores; some pebbles; higher in lime than the horizon above.
    2B34—140 to 155 centimeters (55.1 to 61.0 inches); very dark gray (10YR 3/1) coats on faces of peds; fragments; strong effervescence; moderately alkaline, pH 8.2, unspecified; gradual smooth boundary. Lab sample # 40A11626. color, texture, mottles, structure, and consistence similar to 2B33 horizon; lime on vertical faces decreases but 1/4 inch lime concretions are common; prominent filament lime along pores; krotovinas are as in horizon above.
    2C1—155 to 170 centimeters (61.0 to 66.9 inches); 70 percent yellowish brown (10YR 5/6) and 30 percent gray (5Y 5/1) loam; massive; friable; 15 percent coats on vertical faces of peds and 15 percent yellowish red (5YR 4/6) oxide coats; fragments; strong effervescence; moderately alkaline, pH 8.2, unspecified; gradual smooth boundary. Lab sample # 40A11627. some vertical faces with thin coats of gray (5Y 5/1); few lime nodules.
    2C2—170 to 183 centimeters (66.9 to 72.0 inches); fragments. Lab sample # 40A11628. this horizon is the same as that above but the vertical faces are less distinct.