IDENTIFIERS

  • Current Taxon Name (Soil Name): COHASSET
  • OSD
  • Series Extent
  • User Site ID: S1972CA055005
  • User Pedon ID: S1972CA055005
  • Vegetation Plot ID: S1972CA055005
  • Lab Information:
  • Certified Lab Pedon Description - no
  • Lab Source ID - SSL
  • Lab Pedon # - 72C0147
  • NCSS Pedon Lab Data NASIS Record ID - 44081
  • 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: 38.5675011
  • Std. Longitude: -122.4250031
  • Datum: WGS84
  • Township: 8N
  • Range: 5W
  • Section: 4
  • PLSS Details: SW 1/4, SW 1/4
  • Location Description: Napa County, California. A pit located 4,800 feet on Los Posadas Road from Howell Mountain Road and 90 feet south from Los Posadas Road.
  • State: California
  • County: CA055—Napa
  • MLRA: 15—Central California Coast Range
  • Non-MLRA Soil Survey Area: CA055—Napa County, California

    • PEDON

  • Describers Name: T. D. Cook, G. Lambert
  • Current Taxonomic Class: Fine-loamy, mixed, mesic Ultic Haploxeralfs
  • Pedon Record Orgin: Converted from PDP 3.x
  • Pedon #: 5
  • Correlated Information:
  • Soil Name - COHASSET
  • PSC - 10 to 60 cm.
  • Classificaton Date - 5/11/2005
  • Moisture Class - xeric
  • Sampled As Information:
  • Soil Name - Cohasset
  • Classificaton Date - 11/16/1972
  • Dynamic Soil Properties:
  • Pedoderm Loose Cover Indicator - no
  • Hydric: no


    • SITE

  • Parent Material: rhyolitic tuff
  • Landscape: nearly level plateau
  • Runoff: low
  • Drainage Class: well
  • Surface Fragments:
  • Benchmark Soil?: no

    • VEGETATION

    SITE OBSERVATION

  • Observation Date: 11/16/1972 (actual site observation date)
  • 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

    ARCTO3

    PSME

    QUERC

    Arctostaphylos

    Pseudotsuga menziesii

    Quercus

    manzanita

    Douglas-fir

    oak

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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

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    512.1

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    1016

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    14

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    O1—0 to 5 centimeters (0.0 to 2.0 inches); material; fragments.; observed in pit, small
    A1—5 to 15 centimeters (2.0 to 5.9 inches); brown (7.5YR 5/4), dark reddish brown (5YR 3/4), moist; loam; weak fine single grain; slightly hard, friable, slightly sticky, slightly plastic; 21.0 very fine roots and 0.5 medium roots and 21.0 fine roots; 3.0 very fine interstitial and 3.0 very fine tubular pores; fragments; moderately acid, pH 6.0; gradual smooth boundary. Lab sample # 72C00898; observed in pit, small
    Bt1—15 to 33 centimeters (5.9 to 13.0 inches); brown (7.5YR 5/4), yellowish red (5YR 4/6), moist; clay loam; moderate medium subangular blocky structure; slightly hard, friable, moderately sticky, moderately plastic; 3.0 medium roots and 0.5 coarse roots; 21.0 very fine interstitial and 21.0 very fine tubular and 21.0 fine interstitial and 21.0 fine tubular pores; 10 percent clay films on all faces of peds and 10 percent clay films on surfaces along pores; fragments; moderately acid, pH 6.0; gradual smooth boundary. Lab sample # 72C00899; observed in pit, small
    Bt2—33 to 61 centimeters (13.0 to 24.0 inches); brown (7.5YR 5/4), reddish brown (5YR 4/4), moist; clay loam; moderate medium subangular blocky structure; slightly hard, friable, moderately sticky, moderately plastic; 21.0 very fine roots and 21.0 fine roots and 0.5 coarse roots; 3.0 very fine interstitial and 3.0 very fine tubular and 3.0 fine interstitial and 3.0 fine tubular pores; 30 percent clay films on all faces of peds and 30 percent clay films on surfaces along pores; fragments; slightly acid, pH 6.3; clear wavy boundary. Lab sample # 72C00900; observed in pit, small
    B3T—61 to 91 centimeters (24.0 to 35.8 inches); light brown (7.5YR 6/4), brown (7.5YR 4/4), moist; clay loam; weak fine subangular blocky structure; slightly hard, friable, moderately sticky, moderately plastic; 3.0 very fine roots and 3.0 fine roots; 3.0 very fine interstitial and 3.0 very fine tubular and 3.0 fine interstitial and 3.0 fine tubular pores; 10 percent clay films on all faces of peds and 10 percent clay films on surfaces along pores; fragments; slightly acid, pH 6.2; clear wavy boundary. Lab sample # 72C00901; observed in pit, small
    C1—91 to 117 centimeters (35.8 to 46.1 inches); pink (7.5YR 7/4), brown (7.5YR 5/4), moist; clay loam; massive; slightly hard, friable, slightly sticky, slightly plastic; 0.5 very fine roots and 0.5 fine roots and 0.5 coarse roots; 3.0 very fine interstitial and 3.0 very fine tubular and 3.0 fine interstitial and 3.0 fine tubular pores; 10 percent clay films on all faces of peds; fragments; slightly acid, pH 6.2; gradual smooth boundary. Lab sample # 72C00902; observed in pit, small
    C2—117 to 147 centimeters (46.1 to 57.9 inches); pink (7.5YR 7/4), brown (7.5YR 5/4), moist; clay loam; massive; hard, friable, slightly sticky, slightly plastic; 0.5 very fine roots and 0.5 fine roots; 0.5 very fine tubular and 0.5 fine tubular pores; 10 percent clay films on all faces of peds; fragments; slightly acid, pH 6.2. Lab sample # 72C00903; observed in pit, small