IDENTIFIERS

  • Current Taxon Name (Soil Name): Surpur
  • OSD
  • Series Extent
  • User Site ID: S1986CA605REDW003
  • User Pedon ID: S10CA023021
  • Vegetation Plot ID: S1986CA605REDW003
  • Lab Information:
  • Certified Lab Pedon Description - no
  • Lab Source ID - SSL
  • Lab Pedon # - 10N0692
  • NCSS Pedon Lab Data NASIS Record ID - 58618
  • Print Date: 5/14/2025

    • 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: 41.2500414
  • Std. Longitude: -124.0742562
  • Datum: WGS84
  • Township: 10N
  • Range: 1E
  • Section: 16
  • PLSS Details: southwest quarter, southwest quarter
  • Location Description: Redwood National Park, Humboldt County, California; 2 miles south from westside access road gate, east of road
  • 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: Jim Popenoe & Nancy Sturhan
  • Current Taxonomic Class: Fine-loamy, mixed, superactive, isomesic Typic Haplohumults
  • Current Taxon Kind: series
  • Pedon Type: within range of map unit
  • Pedon Purpose: full pedon description
  • Pedon Record Orgin: NASIS
  • Pedon #: 21
  • Correlated Information:
  • Soil Name - Surpur
  • PSC - 97 to 147 cm.
  • Classificaton Date - 4/12/2010
  • Soil Taxonomic Edition - tenth edition
  • Moisture Class - udic
  • Moisture Subclass - typic
  • Sampled As Information:
  • Soil Name - Surpur
  • Classificaton Date - 7/21/1986
  • 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: linear
  • Slope Shape Down: linear
  • Runoff: low
  • Drainage Class: well
  • Flooding: none flooding
  • Ponding: none ponding
  • Geology: Marine Sediments formation.
  • Surface Fragments:
  • Benchmark Soil?: no

    • VEGETATION

    SITE OBSERVATION

  • Observation Date: 7/21/1986 (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

    PISI

    GASH

    VAOV2

    RUPA

    RUSP

    PTAQ

    MOCE2

    Pseudotsuga menziesii

    Sequoia sempervirens

    Alnus rubra

    Picea sitchensis

    Gaultheria shallon

    Vaccinium ovatum

    Rubus parviflorus

    Rubus spectabilis

    Pteridium aquilinum

    Morella cerifera

    Douglas-fir

    redwood

    red alder

    Sitka spruce

    salal

    California huckleberry

    thimbleberry

    salmonberry

    western brackenfern

    wax myrtle

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

    umbric epipedon

    argillic horizon

    2—27

    97—159

    —28—

    —62—
    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

    6

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    300

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    265

    2150

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    280

    11

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    Oi—0 to 2 centimeters (0.0 to 0.8 inches); slightly decomposed plant material; fragments; noneffervescent; abrupt wavy boundary.; dry when described; observed in pit, small
    A1—2 to 9 centimeters (0.8 to 3.5 inches); dark brown (10YR 3/3) broken face, yellowish brown (10YR 5/4) broken face, dry; gravelly sandy loam; 12 percent clay; moderate fine granular structure; soft, very friable, slightly sticky, nonplastic; moderately rapid permeability; 6.0 very fine roots and 1.0 medium roots and 6.0 fine roots; 6.0 very fine irregular and 3.0 medium tubular and 3.0 fine tubular and 1.0 coarse tubular pores; 20 percent by volume nonflat subrounded very strongly coherent cemented 2-38-75 millimeter mixed fragments; noneffervescent; strongly acid, pH 5.5, hellige-truog; clear wavy boundary. Lab sample # 10N03167; dry when described; observed in pit, small
    A2—9 to 27 centimeters (3.5 to 10.6 inches); dark brown (10YR 3/3) broken face, yellowish brown (10YR 5/4) broken face, dry; loam; 20 percent clay; moderate coarse subangular blocky structure; hard, firm, slightly sticky, slightly plastic; moderate permeability; 6.0 very fine roots and 2.0 medium roots and 6.0 fine roots and 1.0 coarse roots; 2.0 very fine irregular and 2.0 very fine tubular and 2.0 fine tubular pores; 8 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 # 10N03168; moist when described; observed in pit, small
    Bw1—27 to 50 centimeters (10.6 to 19.7 inches); dark yellowish brown (10YR 4/4) broken face, brownish yellow (10YR 6/6) broken face, dry; loam; 22 percent clay; weak very coarse subangular blocky, and weak coarse subangular blocky structure; slightly hard, friable, slightly sticky, slightly plastic; moderate permeability; 4.0 very fine roots and 1.0 medium roots and 4.0 fine roots and 1.0 coarse roots; 2.0 very fine tubular and 1.0 fine tubular pores; 6 percent by volume nonflat subrounded very strongly coherent cemented 2-38-75 millimeter mixed fragments; noneffervescent; strongly acid, pH 5.5, hellige-truog; gradual wavy boundary. Lab sample # 10N03169; moist when described; observed in pit, small
    Bw2—50 to 97 centimeters (19.7 to 38.2 inches); yellowish brown (10YR 5/6) broken face, brownish yellow (10YR 6/6) broken face, dry; loam; 22 percent clay; weak very coarse subangular blocky structure; slightly hard, friable, slightly sticky, slightly plastic; moderate permeability; 1.0 very fine roots and 1.0 medium roots and 1.0 fine roots and 1.0 coarse roots; 2.0 very fine tubular and 1.0 medium tubular and 1.0 fine tubular pores; 3 percent by volume nonflat subrounded very strongly coherent cemented 2-38-75 millimeter mixed fragments; noneffervescent; very strongly acid, pH 5.0, hellige-truog; gradual wavy boundary. Lab sample # 10N03170; moist when described; observed in pit, small
    2Bt1—97 to 122 centimeters (38.2 to 48.0 inches); strong brown (7.5YR 5/8) broken face, strong brown (7.5YR 5/8) broken face, dry; clay loam; 28 percent clay; moderate very coarse subangular blocky structure; slightly hard, firm, slightly sticky, slightly 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 5/8), moist, clay films on all faces of peds; 6 percent by volume nonflat rounded very strongly coherent cemented 2-38-75 millimeter mixed fragments; noneffervescent; very strongly acid, pH 4.5, hellige-truog; clear wavy boundary. Lab sample # 10N03171; moist when described; observed in pit, small
    2Bt2—122 to 159 centimeters (48.0 to 62.6 inches); variegated 50 percent brownish yellow (10YR 6/6) broken face and yellowish red (5YR 5/8) broken face, 50 percent yellowish red (5YR 5/8) broken face, dry; loam; 32 percent clay; weak very coarse subangular blocky structure; hard, firm, slightly sticky, slightly plastic; moderately slow permeability; 0.5 very fine roots; 1.0 very fine tubular pores; 2 percent distinct red (2.5YR 4/8), moist, clay films on all faces of peds; 18 percent by volume nonflat rounded very strongly coherent cemented 2-38-75 millimeter mixed fragments; noneffervescent; extremely acid, pH 4.0, hellige-truog; gradual wavy boundary. Lab sample # 10N03172; moist when described; observed in pit, small
    2C—165 to 204 centimeters (65.0 to 80.3 inches); variegated 50 percent light brown (7.5YR 6/4) broken face and 50 percent weak red (10R 4/3) broken face and 50 percent yellowish red (5YR 5/8) broken face, 50 percent yellowish red (5YR 5/8) broken face, dry; gravelly sandy clay loam; 25 percent clay; massive; very hard, very firm, slightly sticky, slightly plastic; moderately slow permeability; 0.5 very fine roots; 0.5 very fine tubular pores; 2 percent distinct strong brown (7.5YR 5/6), moist, clay films on rock fragments; 25 percent by volume nonflat rounded very strongly coherent cemented 2-38-75 millimeter mixed fragments; noneffervescent; extremely acid, pH 4.0, hellige-truog.; moist when described; observed in pit, small