IDENTIFIERS

  • Current Taxon Name (Soil Name): Duncan
  • OSD
  • Series Extent
  • User Site ID: S1969AZ003007
  • User Pedon ID: S1969AZ003007
  • Vegetation Plot ID: S1969AZ003007
  • Lab Information:
  • Certified Lab Pedon Description - no
  • Lab Source ID - SSL
  • Lab Pedon # - 69C0153
  • NCSS Pedon Lab Data NASIS Record ID - 43726
  • Print Date: 2/16/2025

    • 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: 32.2827797
  • Std. Longitude: -109.8672256
  • Datum: WGS84
  • Township: 13S
  • Range: 24E
  • Section: 23
  • PLSS Details: 100 feet north and 2200 feet east of the SW corner
  • Location Description: About 2 miles west and 2 miles north of Willcox.
  • State: Arizona
  • County: AZ003—Cochise

    • PEDON

  • Describers Name: D. Richmond, H. Havens, K. Dunstan
  • Current Taxonomic Class: Fine, mixed, active, thermic Natrargidic Natridurids
  • 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
  • Pedon #: 7
  • Correlated Information:
  • Soil Name - Duncan
  • PSC - 13 to 63 cm.
  • Classificaton Date - 2/1/2010
  • Moisture Class - aridic (torric)
  • Sampled As Information:
  • Soil Name - Duncan
  • Classificaton Date - 10/15/1969
  • Dynamic Soil Properties:
  • Pedoderm Loose Cover Indicator - no
  • Hydric: no


    • SITE

  • Landform: alluvial flat
  • Slope Shape Down: convex
  • Runoff: low
  • Drainage Class: well
  • Surface Fragments:
  • Benchmark Soil?: no

    • VEGETATION

    SITE OBSERVATION

  • Observation Date: 10/15/1969 (actual site observation date)
  • Surface Cover Properties:
  • Site Obs. Cover Kind 1 - grass/herbaceous cover
  • Site Obs. Cover Kind 2 - rangeland, grassland
  • 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

    SPAI

    Sporobolus airoides

    alkali sacaton

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    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

    2

    —

    —

    1278

    —

    225

    305

    —

    —

    14.4

    25

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    A21—0 to 5 centimeters (0.0 to 2.0 inches); light gray (10YR 7/2), dark grayish brown (10YR 4/2), moist; loam; weak thick platy structure; slightly hard, friable, slightly sticky, slightly plastic; 21.0 fine and medium roots; medium and coarse vesicular and tubular and 3.0 fine pores; fragments; slight effervescence; strongly alkaline, pH 8.8, thymol-blue; abrupt smooth boundary. Lab sample # 69C00789; dry when described;
    A22—5 to 13 centimeters (2.0 to 5.1 inches); light gray (10YR 7/2), dark grayish brown (10YR 4/2), moist; loam; massive; slightly hard, very friable, slightly sticky, slightly plastic; 21.0 fine and medium roots; 3.0 very fine and fine and medium vesicular and 0.5 tubular pores; fragments; slight effervescence; strongly alkaline, pH 8.8, thymol-blue; abrupt smooth boundary. Lab sample # 69C00790; dry when described;
    B21T—13 to 28 centimeters (5.1 to 11.0 inches); brown (10YR 5/3), dark brown (10YR 3/3), moist; clay; moderate medium prismatic parts to strong medium and coarse angular blocky, and subangular blocky structure; hard when dry, friable, moderately sticky, moderately plastic; 21.0 fine and medium roots and 0.5 coarse roots; 30 percent light brownish gray (10YR 6/2), moist, clay films on faces of peds; 1 percent fine irregular noncoherent cemented white (10YR 8/1) carbonate masses; fragments; slight effervescence; very strongly alkaline, pH 9.6, thymol-blue; clear wavy boundary. Lab sample # 69C00791; dry when described;
    B22TSA—28 to 48 centimeters (11.0 to 18.9 inches); light brown (7.5YR 6/4), brown (7.5YR 4/4), moist; clay loam; moderate medium prismatic parts to moderate fine and medium subangular blocky, and angular blocky structure; hard when dry, friable, moderately sticky, moderately plastic; 21.0 fine and medium roots and 0.5 coarse roots; 0.5 fine tubular pores; 30 percent light brownish gray (10YR 6/2), moist, clay films on faces of peds; 1 percent fine irregular noncoherent cemented white (10YR 8/1) carbonate masses; fragments; strong effervescence; very strongly alkaline, pH 9.6, thymol-blue; clear wavy boundary. Lab sample # 69C00792; dry when described;
    B23TSA—48 to 79 centimeters (18.9 to 31.1 inches); pinkish gray (7.5YR 7/2), brown (7.5YR 5/4) and light brownish gray (10YR 6/2), moist; clay; moderate fine subangular blocky structure; very hard, friable, moderately sticky, very plastic; 3.0 fine and medium roots and 0.5 coarse roots; 0.5 very fine tubular pores; 30 percent light brownish gray (10YR 6/2), moist, clay films on faces of peds; 1 percent fine irregular noncoherent cemented white (10YR 8/1) carbonate masses; fragments; strong effervescence; very strongly alkaline, pH 9.6, thymol-blue; clear wavy boundary. Lab sample # 69C00793; dry when described;
    B3CASA—79 to 89 centimeters (31.1 to 35.0 inches); pinkish gray (7.5YR 7/2), brown (7.5YR 5/4), moist; clay; moderate fine and medium subangular blocky structure; very hard, friable, moderately sticky, moderately plastic; 0.5 medium roots; 3.0 very fine tubular pores; 10 percent pale brown (10YR 6/3), moist, clay films on faces of peds; 21 percent medium irregular noncoherent cemented white (10YR 8/1) carbonate masses; fragments; violent effervescence; very strongly alkaline, pH 9.6, thymol-blue; abrupt smooth boundary. Lab sample # 69C00794; dry when described;
    CCASIM—89 to 100 centimeters (35.0 to 39.4 inches); very pale brown (10YR 7/3), light yellowish brown (10YR 6/4), moist; massive; extremely hard, weakly coherent by carbonates and silica; 0.5 fine to coarse roots; 0.5 very fine vesicular pores; fragments; violent effervescence; very strongly alkaline, pH 9.6, thymol-blue; clear smooth boundary. Lab sample # 69C00795; dry when described;
    B21TCAB—100 to 115 centimeters (39.4 to 45.3 inches); reddish brown (5YR 5/4) and pinkish white (7.5YR 8/2), reddish brown (5YR 4/4) and light brown (7.5YR 6/4), moist; gravelly clay loam; moderate medium subangular blocky structure; very hard, friable, weakly coherent by carbonates and silica, moderately sticky, moderately plastic; 0.5 fine tubular pores; 30 percent clay films on faces of peds; 21 percent medium irregular noncoherent cemented carbonate masses; fragments; strong effervescence; very strongly alkaline, pH 9.6, thymol-blue; clear wavy boundary. Lab sample # 69C00796; dry when described;. approximately 10 to 12 percent by volume of rounded silica-lime cemented nodules (durinodes) 1/4 to 1-1/2 inches in diameter, many medium and large irregularly shaped soft masses of CaCO3.
    B22TB—115 to 150 centimeters (45.3 to 59.1 inches); reddish brown (5YR 5/4), reddish brown (5YR 4/4), moist; clay loam; moderate medium subangular blocky structure; hard when dry, friable, moderately sticky, moderately plastic; 3.0 very fine and fine tubular pores; 30 percent clay films on faces of peds and in pores; 1 percent fine salt masses and 1 percent fine irregular noncoherent cemented carbonate masses; fragments; slight effervescence; moderately alkaline, pH 8.4, thymol-blue. Lab sample # 69C00797; dry when described;