IDENTIFIERS

  • Current Taxon Name (Soil Name): Darkprairie
  • OSD
  • Series Extent
  • User Site ID: S2000CA023001
  • User Pedon ID: S2000CA023001
  • Vegetation Plot ID: S2000CA023001
  • Lab Information:
  • Certified Lab Pedon Description - yes
  • Lab Source ID - SSL
  • Lab Pedon # - 01N0353
  • NCSS Pedon Lab Data NASIS Record ID - 15017
  • 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: 40.5086098
  • Std. Longitude: -124.3244476
  • Datum: WGS84
  • Township: 2N
  • Range: 2W
  • Section: 32
  • Location Description: Humboldt County, California; site is south of Mayflower ranch.
  • Map Unit: 4406—Peaked-Oceanhouse-Forhaux complex, 5 to 30 percent slopes
  • State: California
  • County: CA023—Humboldt
  • MLRA: 4B—Coastal Redwood Belt
  • Non-MLRA Soil Survey Area: CA605—Humboldt and Del Norte Area, California
  • 7.5 Minute USGS Quad: 40124-E3—Ferndale, California

    • PEDON

  • Describers Name: William Reed
  • Current Taxonomic Class: Fine-silty, isotic, mesic Pachic Haploxerolls
  • Current Taxon Kind: series
  • Pedon Type: OSD pedon
  • Pedon Purpose: full pedon description
  • Pedon Record Orgin: NASIS
  • Pedon #: 1
  • Correlated Information:
  • Soil Name - Darkprairie
  • Classificaton Date - 5/25/2016
  • Classifier - Sue Aszman
  • Sampled As Information:
  • Soil Name - Darkprarie
  • Taxonomic Class - Fine-loamy, mixed, superactive, isomesic Ultic Hapludalfs
  • PSC - 43 to 93 cm.
  • Classificaton Date - 10/22/1997
  • Soil Taxonomic Edition - eighth edition
  • Moisture Class - udic
  • Dynamic Soil Properties:
  • Pedoderm Loose Cover Indicator - no
  • Hydric: no


    • SITE

  • Parent Material: residuum weathered from siltstone
  • Landscape: mountains
  • Landform: mountain slope
  • Geomorphic Component Mountains: mountainflank
  • Hill Slope Profile: backslope
  • Slope Position: upper third
  • Slope Complexity: complex
  • Drainage Class: well
  • Flooding: none flooding
  • Bedrock: ;
  • Geology: ; Pullen Formation formation.
  • Surface Fragments:
  • Benchmark Soil?: no

    • VEGETATION

    SITE OBSERVATION

  • Observation Date: 10/22/1997 (actual site observation date)
  • Air Photo ID: 6247-177
  • 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

    ACHIL

    BAPI

    CIRSI

    PTAQ

    Achillea

    Baccharis pilularis

    Cirsium

    Pteridium aquilinum

    yarrow

    coyotebrush

    thistle

    western brackenfern

    —

    —

    —

    —

    —

    —

    —

    —

    —

    —

    —

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

    mollic epipedon

    argillic horizon

    0—43

    43—100

    —43—

    —57—
    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

    15

    —

    —

    425

    —

    165

    1525

    —

    —

    10

    —

    —

    10

    —

    —

    —

    —

    —

    —

    —
    A1—0 to 15 centimeters (0.0 to 5.9 inches); very dark grayish brown (10YR 3/2) broken face, very dark grayish brown (10YR 3/2) broken face, dry; silty clay loam; 10 percent sand; 56 percent silt; 34 percent clay; moderate fine subangular blocky, and moderate medium subangular blocky structure; soft, very friable, slightly sticky, slightly plastic; 4.0 very fine roots and 4.0 fine roots; 10.0 very fine irregular pores; fragments; very strongly acid, pH 5.0, pH meter; gradual smooth boundary. Lab sample # 01N02131; moist when described; observed in pit, small
    A2—15 to 43 centimeters (5.9 to 16.9 inches); very dark grayish brown (10YR 3/2) broken face, very dark grayish brown (10YR 3/2) broken face, dry; silty clay loam; 9 percent sand; 54 percent silt; 36 percent clay; moderate medium subangular blocky, and moderate fine subangular blocky structure; soft, very friable, slightly sticky, slightly plastic; 2.0 very fine roots and 2.0 fine roots; 10.0 very fine irregular pores; fragments; strongly acid, pH 5.3, pH meter; gradual smooth boundary. Lab sample # 01N02132; moist when described; observed in pit, small
    Bt1—43 to 80 centimeters (16.9 to 31.5 inches); very dark gray (10YR 3/1) broken face, very dark gray (10YR 3/1) broken face, dry; silty clay loam; 10 percent sand; 55 percent silt; 35 percent clay; strong medium subangular blocky structure; soft, very friable, slightly sticky, slightly plastic; 0.5 very fine roots and 0.5 fine roots; 0.5 very fine tubular pores; 15 percent clay films on all faces of peds; fragments; strongly acid, pH 5.3, pH meter; clear smooth boundary. Lab sample # 01N02133; moist when described; observed in pit, small
    Bt2—80 to 100 centimeters (31.5 to 39.4 inches); very dark gray (10YR 3/1) broken face, very dark gray (10YR 3/1) broken face, dry; silty clay loam; 11 percent sand; 57 percent silt; 33 percent clay; weak very fine subangular blocky structure; soft, very friable, slightly sticky, slightly plastic; 0.5 very fine roots and 0.5 fine roots; 10.0 very fine irregular pores; 15 percent clay films on all faces of peds; brownish yellow (10YR 6/8) and yellowish brown (10YR 5/8) iron-manganese concretions; 1 percent by volume 2-3-5 millimeter siltstone, unspecified fragments and 2 percent by volume 5-13-20 millimeter siltstone, unspecified fragments; strongly acid, pH 5.3, pH meter; abrupt smooth boundary. Lab sample # 01N02134; moist when described; observed in pit, small
    Cr—100 centimeters (39.4 inches); light yellowish brown (10YR 6/4) broken face; slightly sticky, slightly plastic; fragments.; moist when described; observed in pit, small