IDENTIFIERS

  • Current Taxon Name (Soil Name): unnamed
  • OSD
  • Series Extent
  • User Site ID: S1972CA013002
  • User Pedon ID: S1972CA013002
  • Vegetation Plot ID: S1972CA013002
  • Lab Information:
  • Certified Lab Pedon Description - no
  • Lab Source ID - SSL
  • Lab Pedon # - 72C0004
  • NCSS Pedon Lab Data NASIS Record ID - 43938
  • Print Date: 2/3/2025

    • LOCATION

  • Location Description: 1/2 mile east of Cummings Skyway. Triangulation from BM 245 13.5 W of North, BM 49 151W of North, BM 246 179W of North.
  • Map Unit: LhF—Los Osos clay loam, 30 to 50 percent slopes
  • State: California
  • County: CA013—Contra Costa
  • Non-MLRA Soil Survey Area: CA013—Contra Costa County, California

    • PEDON

  • Describers Name: LEW & DKM
  • Current Taxonomic Class: Fine, montmorillonitic, thermic Typic Argixerolls
  • Pedon Record Orgin: NASIS
  • Pedon #: 2
  • Correlated Information:
  • Soil Name - unnamed
  • Classificaton Date - 7/24/2007
  • Sampled As Information:
  • Soil Name - Los Osos
  • Classificaton Date - 4/10/1972
  • Dynamic Soil Properties:
  • Erosion Class - 2
  • Pedoderm Loose Cover Indicator - no
  • Hydric: no


    • SITE

  • Parent Material: interbedded sandstone and shale
  • Landform: upland slope
  • Slope Shape Down: convex
  • Runoff: very high
  • Drainage Class: well
  • Bedrock: sandstone and shale
  • Surface Fragments:
  • Benchmark Soil?: no

    • VEGETATION

    SITE OBSERVATION

  • Observation Date: 4/10/1972 (actual site observation date)
  • Air Photo ID: BUU12V41
  • Surface Cover Properties:
  • 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

    AVSA

    HORDE

    Avena sativa

    Hordeum

    common oat

    barley

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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

    49

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    229

    —

    203

    508

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    14.4

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    A11—0 to 15 centimeters (0.0 to 5.9 inches); brown (10YR 4/3), dark brown (10YR 3/3), moist; silty clay loam; moderate medium subangular blocky structure; hard, friable, moderately sticky, moderately plastic; 21.0 very fine roots; 0.5 very fine interstitial and 0.5 very fine tubular pores; fragments; neutral, pH 7.0; clear wavy boundary. Lab sample # 72C00023
    A12—15 to 33 centimeters (5.9 to 13.0 inches); brown (10YR 4/3), dark brown (10YR 3/3), moist; clay; weak medium subangular blocky structure; hard, friable, moderately sticky, moderately plastic; 3.0 very fine roots; 0.5 very fine tubular pores; fragments; neutral, pH 7.0; gradual wavy boundary. Lab sample # 72C00024
    B21—33 to 66 centimeters (13.0 to 26.0 inches);, brown (10YR 4/3), moist; clay; weak angular blocky structure; hard, friable, moderately sticky, moderately plastic; 3.0 very fine roots; 0.5 very fine tubular pores; 1 percent thin clay films on surfaces along pores; fragments; neutral, pH 7.2; clear wavy boundary. Lab sample # 72C00025
    B22—66 to 97 centimeters (26.0 to 38.2 inches);, brown (10YR 4/3), moist; clay; weak medium and coarse angular blocky structure; hard, friable, moderately sticky, very plastic; 0.5 very fine roots; 0.5 very fine tubular pores; 10 percent thin clay films on surfaces along pores and 10 percent thin clay films on all faces of peds; fragments; slightly alkaline, pH 7.5; abrupt smooth boundary. Lab sample # 72C00026
    C1—97 to 142 centimeters (38.2 to 55.9 inches);, dark grayish brown (2.5Y 4/2) and dark yellowish brown (10YR 4/4), moist; bedrock; hard, firm; 0.5 very fine roots; 0.5 very fine tubular pores; fragments; slightly alkaline, pH 7.5. Lab sample # 72C00027
    C2—142 to 188 centimeters (55.9 to 74.0 inches);, pale brown (10YR 6/3) and dark grayish brown (2.5Y 4/2), moist; bedrock; 0.5 very fine roots; fragments. Lab sample # 72C00028
    C3—188 to 249 centimeters (74.0 to 98.0 inches);, dark grayish brown (2.5Y 4/2) and olive brown (2.5Y 4/4), moist; bedrock; fragments. Lab sample # 72C00029