IDENTIFIERS

  • Current Taxon Name (Soil Name): Surpur
  • OSD
  • Series Extent
  • User Site ID: S1986CA605REDW004
  • User Pedon ID: S10CA023022
  • Vegetation Plot ID: S1986CA605REDW004
  • Lab Information:
  • Certified Lab Pedon Description - no
  • Lab Source ID - SSL
  • Lab Pedon # - 10N0693
  • NCSS Pedon Lab Data NASIS Record ID - 58619
  • Print Date: 2/2/2025

    • 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: 41.2539919
  • Std. Longitude: -124.0756339
  • Datum: WGS84
  • Location Description: Redwood National Park, Humboldt County, California; 5 miles w of West Access road; 1.9 miles south of gate
  • Map Unit: 251—Surpur, 2 to 9 percent slopes
  • State: California
  • County: CA023—Humboldt
  • MLRA: 4—California Coastal Redwood Belt
  • Non-MLRA Soil Survey Area: CA605—Humboldt and Del Norte Area, California
  • 7.5 Minute USGS Quad: 41124-C1—Orick, California

    • PEDON

  • Describers Name: Nancy Sturhan
  • Current Taxonomic Class: Fine-loamy, mixed, active, isomesic Typic Haplohumults
  • Current Taxon Kind: series
  • Pedon Type: within range of map unit
  • Pedon Purpose: full pedon description
  • Pedon Record Orgin: NASIS
  • Pedon #: 22
  • Correlated Information:
  • Soil Name - Surpur
  • PSC - 49 to 99 cm.
  • Classificaton Date - 4/12/2010
  • Soil Taxonomic Edition - tenth edition
  • Moisture Class - udic
  • Moisture Subclass - typic
  • Sampled As Information:
  • Soil Name - Empire
  • Classificaton Date - 7/22/1986
  • Dynamic Soil Properties:
  • Erosion Class - 0
  • Pedoderm Loose Cover Indicator - no
  • Hydric: no


    • SITE

  • Parent Material: marine deposits derived from mixed sources
  • Landscape: mountains
  • Landform: mountain on uplifted marine terrace
  • Geomorphic Component Mountains: mountaintop
  • Hill Slope Profile: summit
  • Slope Complexity: simple
  • Slope Shape Across: convex
  • Slope Shape Down: convex
  • Runoff: medium
  • Drainage Class: well
  • Flooding: none flooding
  • Ponding: none ponding
  • Geology: Marine Sediments Over Residdum Derived From Schist formation.
  • Surface Fragments:
  • Benchmark Soil?: no

    • VEGETATION

    SITE OBSERVATION

  • Observation Date: 7/22/1986 (actual site observation date)
  • Air Photo ID: 4-22
  • Surface Water Kind: none observed
  • Plant Association Name: Redwood-Douglas-fir Forest
  • Surface Cover Properties:
  • Site Obs. Cover Kind 1 - tree cover
  • Site Obs. Cover Kind 2 - intermixed conifers and hardwoods
  • 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

    PSME

    SESE3

    ALRU2

    GASH

    RUUR

    RUPA

    POMU

    IRIS

    RUDI2

    Pseudotsuga menziesii

    Sequoia sempervirens

    Alnus rubra

    Gaultheria shallon

    Rubus ursinus

    Rubus parviflorus

    Polystichum munitum

    Iris

    Rubus discolor

    Douglas-fir

    redwood

    red alder

    salal

    California blackberry

    thimbleberry

    western swordfern

    iris

    Himalayan blackberry

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

    ochric epipedon

    argillic horizon

    0—20

    49—152

    —20—

    —103—
    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

    9

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    —

    300

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    240

    2150

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    280

    11

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    Oi—0 to 5 centimeters (0.0 to 2.0 inches); slightly decomposed plant material; fragments; noneffervescent; abrupt wavy boundary.; moist when described; observed in pit, small
    A—5 to 20 centimeters (2.0 to 7.9 inches); very dark brown (10YR 2/2) broken face, dark brown (10YR 3/3) broken face, dry; sandy loam; 14 percent clay; moderate fine granular structure; slightly hard, very friable, slightly sticky, slightly plastic; moderate permeability; 6.0 very fine roots and 2.0 medium roots and 6.0 fine roots; 2.0 very fine tubular and 6.0 very fine irregular and 2.0 medium tubular and 2.0 fine tubular pores; 12 percent by volume nonflat subrounded very strongly coherent cemented 2-38-75 millimeter mixed fragments; noneffervescent; strongly acid, pH 5.5, hellige-truog; abrupt wavy boundary. Lab sample # 10N03174; moist when described; observed in pit, small
    BA—20 to 49 centimeters (7.9 to 19.3 inches); dark yellowish brown (10YR 4/6) broken face, yellowish brown (10YR 5/6) broken face, dry; loam; 18 percent clay; moderate coarse subangular blocky structure; slightly hard, friable, slightly sticky, slightly plastic; moderate permeability; 4.0 very fine roots and 2.0 medium roots and 4.0 fine roots and 1.0 coarse roots; 2.0 very fine tubular and 1.0 fine tubular pores; 12 percent by volume nonflat subrounded very strongly coherent cemented 2-38-75 millimeter mixed fragments; noneffervescent; moderately acid, pH 6.0, hellige-truog; clear wavy boundary. Lab sample # 10N03175; moist when described; observed in pit, small
    Bt1—49 to 100 centimeters (19.3 to 39.4 inches); strong brown (7.5YR 5/6) broken face, brownish yellow (10YR 6/6) broken face, dry; loam; 24 percent clay; weak very coarse subangular blocky structure; hard, friable, slightly sticky, slightly plastic; moderate permeability; 3.0 very fine roots and 1.0 medium roots and 3.0 fine roots and 1.0 coarse roots; 2.0 very fine tubular and 1.0 medium tubular and 2.0 fine tubular pores; 2 percent distinct yellowish red (5YR 5/6), moist, clay films on all faces of peds; 3 percent by volume nonflat rounded very strongly coherent cemented 2-38-75 millimeter mixed fragments; noneffervescent; very strongly acid, pH 5.0, hellige-truog; abrupt wavy boundary. Lab sample # 10N03176; moist when described; observed in pit, small
    2Bt2—100 to 115 centimeters (39.4 to 45.3 inches); strong brown (7.5YR 5/8) broken face, reddish yellow (7.5YR 6/6) broken face, dry; loam; 26 percent clay; weak very coarse subangular blocky structure; soft, friable, slightly sticky, slightly plastic; moderate permeability; 1.0 very fine roots and 1.0 medium roots and 1.0 fine roots; 2.0 very fine tubular and 2.0 fine tubular pores; 2 percent distinct yellowish red (5YR 5/6), moist, clay films on all faces of peds; 8 percent by volume nonflat rounded very strongly coherent cemented 2-38-75 millimeter mixed fragments; noneffervescent; very strongly acid, pH 5.0, hellige-truog; abrupt wavy boundary. Lab sample # 10N03177; moist when described; observed in pit, small
    2Bt3—110 to 152 centimeters (43.3 to 59.8 inches); 66 percent yellowish red (5YR 5/8) broken face and 33 percent strong brown (7.5YR 5/8) broken face, 66 percent reddish yellow (5YR 6/8) broken face and 33 percent reddish yellow (7.5YR 6/6) broken face, dry; silty clay loam; 30 percent clay; weak very coarse subangular blocky structure; slightly hard, firm, moderately sticky, moderately plastic; moderately slow permeability; 1.0 very fine roots and 1.0 fine roots; 1.0 very fine tubular and 1.0 fine tubular pores; 2 percent distinct yellowish red (5YR 5/6), moist, clay films on all faces of peds; 8 percent by volume nonflat subangular very strongly coherent cemented 2-38-75 millimeter schist, unspecified fragments; noneffervescent; very strongly acid, pH 5.0, hellige-truog; clear wavy boundary. Lab sample # 10N03178; moist when described; observed in pit, small
    2CBt1—152 to 167 centimeters (59.8 to 65.7 inches); red (2.5YR 4/8) broken face, light red (2.5YR 6/8) broken face, dry; extremely gravelly sandy loam; 16 percent clay; massive; hard, friable, slightly sticky, slightly plastic; moderate permeability; 0.5 very fine roots; 1.0 very fine tubular pores; 2 percent distinct red (2.5YR 4/6), moist, clay films on rock fragments; 66 percent by volume nonflat subangular very strongly coherent cemented 2-38-75 millimeter schist, unspecified fragments; noneffervescent; strongly acid, pH 5.5, hellige-truog; clear irregular boundary. Lab sample # 10N03179; moist when described; observed in pit, small
    2CBt2—167 to 200 centimeters (65.7 to 78.7 inches); red (2.5YR 4/8) broken face, light red (2.5YR 6/8) broken face, dry; very gravelly loamy sand; 4 percent clay; massive; hard, firm, nonsticky, nonplastic; moderately rapid permeability; 0.5 very fine roots; 1.0 very fine tubular pores; 2 percent distinct red (2.5YR 4/6), moist, clay films on rock fragments; 50 percent by volume nonflat subangular very strongly coherent cemented 2-38-75 millimeter schist, unspecified fragments; noneffervescent; moderately acid, pH 6.0, hellige-truog. Lab sample # 10N03180; moist when described; observed in pit, small