IDENTIFIERS

  • Current Taxon Name (Soil Name): Surpur
  • OSD
  • Series Extent
  • User Site ID: 03CA605REDW037
  • User Pedon ID: 03CA605REDW037
  • Vegetation Plot ID: 03CA605REDW037
  • Lab Information:
  • Certified Lab Pedon Description - no
  • Lab Source ID - SSL
  • Lab Pedon # - 05N0018
  • NCSS Pedon Lab Data NASIS Record ID - 17524
  • Print Date: 4/23/2025

    • 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: 41.3133611
  • Std. Longitude: -123.9533056
  • Datum: WGS84
  • Township: 11N
  • Range: 2E
  • Section: 28
  • PLSS Details: southeast quarter, northwest quarter
  • Location Description: Redwood National Park, Humboldt County, California; located approximately 10.0 kilometers on Lost Man Creek Trail from trailhead; bankcut.
  • Map Unit: 290—Surpur-Mettah complex, 9 to 30 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: 41123-C8—Holter Ridge, California

    • PEDON

  • Describers Name: Joe Seney
  • Current Taxonomic Class: Fine-loamy, mixed, semiactive, isomesic Andic Haplohumults
  • Current Taxon Kind: series
  • Pedon Type: OSD pedon
  • Pedon Purpose: full pedon description
  • Pedon Record Orgin: NASIS
  • Pedon #: 337
  • Correlated Information:
  • Soil Name - Surpur
  • PSC - 31 to 81 cm.
  • Classificaton Date - 6/27/2012
  • Soil Taxonomic Edition - eleventh edition
  • Moisture Class - udic
  • Moisture Subclass - typic
  • Sampled As Information:
  • Soil Name - Surpur
  • Classificaton Date - 4/22/2003
  • Dynamic Soil Properties:
  • Erosion Class - 0
  • Pedoderm Loose Cover Indicator - no
  • Hydric: no


    • SITE

  • Parent Material: older silty alluvium over sandy alluvium
  • Landscape: mountains
  • Landform: ridge
  • 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
  • Bedrock: mixed
  • Geology: Prairie Creek Formation formation.
  • Surface Fragments:
  • Benchmark Soil?: no

    • VEGETATION

    SITE OBSERVATION

  • Observation Date: 4/22/2003 (actual site observation date)
  • Air Photo ID: 6246-113
  • 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
  • Current Air Temp - 8
    • Vegetation Plot Plants
    Plant Symbol Scientific Name National Vernacular Name Plant Type Group Canopy Cover % Vegetation Stata Level

    GASH

    LIDE3

    PSME

    RHMA3

    SESE3

    VAOV2

    Gaultheria shallon

    Lithocarpus densiflorus

    Pseudotsuga menziesii

    Rhododendron macrophyllum

    Sequoia sempervirens

    Vaccinium ovatum

    salal

    tanoak

    Douglas-fir

    Pacific rhododendron

    redwood

    California huckleberry

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

    ochric epipedon

    argillic horizon

    0—31

    31—159

    —21—

    —128—
    Site Soil Temperature
    Site Obs. Date Depth Sensor Kind Temperature
    cm C

    4/22/2003

    50

    —

    5
    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

    10

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    —

    540

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    90

    2300

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    265

    11

    14

    9

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    Oi—0 to 10 centimeters (0.0 to 3.9 inches); slightly decomposed plant material; loose, loose, nonsticky, nonplastic; rapid permeability; 6.0 very fine roots and 1.0 medium roots and 6.0 fine roots; 8.0 very fine interstitial and 8.0 fine interstitial pores; fragments; noneffervescent; abrupt wavy boundary. Lab sample # 05N00057; moist when described; observed in cut, beveled
    A—10 to 31 centimeters (3.9 to 12.2 inches); dark brown (10YR 3/3) broken face, yellowish brown (10YR 5/4) broken face, dry; gravelly loam; 23 percent clay; weak medium granular, and weak very fine subangular blocky structure; soft, very friable, slightly sticky, slightly plastic; moderate permeability; 4.0 very fine roots and 3.0 medium roots and 4.0 fine roots and 2.0 coarse roots; 2.0 very fine irregular and 10.0 very fine tubular and 2.0 fine irregular and 10.0 fine tubular pores; 1 percent by volume nonflat well rounded indurated 75-162-250 millimeter mixed fragments and 20 percent by volume nonflat well rounded indurated 2-38-75 millimeter mixed fragments; noneffervescent; slightly acid, pH 6.2, pH indicator strip; clear smooth boundary. Lab sample # 05N00058; moist when described; observed in cut, beveled
    Bt1—31 to 47 centimeters (12.2 to 18.5 inches); strong brown (7.5YR 4/6) broken face, strong brown (7.5YR 5/6) broken face, dry; gravelly clay loam; 28 percent clay; moderate fine subangular blocky, and moderate medium subangular blocky structure; slightly hard, friable, moderately sticky, moderately plastic; moderately slow permeability; 4.0 very fine roots and 1.0 medium roots and 4.0 fine roots; 8.0 very fine tubular and 8.0 fine tubular pores; 5 percent faint clay films on all faces of peds; 20 percent by volume nonflat well rounded indurated 2-38-75 millimeter mixed fragments; noneffervescent; slightly acid, pH 6.2, pH indicator strip; gradual wavy boundary. Lab sample # 05N00059; moist when described; observed in cut, beveled
    Bt2—47 to 72 centimeters (18.5 to 28.3 inches); strong brown (7.5YR 4/6) broken face, strong brown (7.5YR 5/6) broken face, dry; clay loam; 28 percent clay; moderate medium subangular blocky, and moderate fine subangular blocky structure; slightly hard, friable, moderately sticky, moderately plastic; moderately slow permeability; 3.0 very fine roots and 3.0 medium roots and 3.0 fine roots and 2.0 coarse roots; 6.0 very fine tubular and 1.0 medium tubular and 6.0 fine tubular pores; 5 percent faint clay films on all faces of peds; 10 percent by volume nonflat well rounded indurated 2-38-75 millimeter mixed fragments; noneffervescent; moderately acid, pH 5.8, pH indicator strip; clear wavy boundary. Lab sample # 05N00060; moist when described; observed in cut, beveled
    Bt3—72 to 103 centimeters (28.3 to 40.6 inches); strong brown (7.5YR 5/6) broken face, reddish yellow (7.5YR 6/6) broken face, dry; clay loam; 29 percent clay; moderate medium subangular blocky structure; slightly hard, friable, slightly sticky, slightly plastic; moderately slow permeability; 2.0 very fine roots and 2.0 medium roots and 2.0 fine roots and 1.0 coarse roots; 4.0 very fine tubular and 1.0 medium tubular and 4.0 fine tubular pores; 10 percent distinct clay films on rock fragments and 15 percent distinct clay films on all faces of peds; 10 percent by volume nonflat well rounded indurated 2-38-75 millimeter mixed fragments; noneffervescent; moderately acid, pH 5.6, pH indicator strip; clear wavy boundary. Lab sample # 05N00061; moist when described; observed in cut, beveled
    Bt4—103 to 130 centimeters (40.6 to 51.2 inches); strong brown (7.5YR 5/6) broken face, reddish yellow (7.5YR 6/6) broken face, dry; sandy loam; 17 percent clay; weak medium subangular blocky structure; slightly hard, friable, slightly sticky, slightly plastic; moderate permeability; 2.0 very fine roots and 1.0 medium roots and 2.0 fine roots and 1.0 coarse roots; 2.0 very fine interstitial and 4.0 very fine tubular and 1.0 medium tubular and 4.0 fine tubular and 2.0 fine interstitial pores; 5 percent distinct red (2.5YR 5/6), moist, clay films on all faces of peds and 30 percent distinct red (2.5YR 5/6), moist, clay bridges between sand grains; 10 percent by volume nonflat well rounded indurated 2-38-75 millimeter mixed fragments; noneffervescent; moderately acid, pH 5.6, pH indicator strip; gradual wavy boundary. Lab sample # 05N00062; moist when described; observed in cut, beveled
    E and Bt1—130 to 159 centimeters (51.2 to 62.6 inches); strong brown (7.5YR 5/8) broken face, reddish yellow (7.5YR 6/8) broken face, dry; sandy loam; 7 percent clay; weak medium subangular blocky, and weak coarse subangular blocky structure; slightly hard, friable, nonsticky, nonplastic; moderately rapid permeability; 2.0 very fine roots and 1.0 medium roots and 2.0 fine roots and 1.0 coarse roots; 2.0 very fine interstitial and 1.0 very fine tubular and 2.0 fine interstitial and 1.0 fine tubular pores; 30 percent distinct red (2.5YR 5/6), moist, clay bridges between sand grains; 10 percent by volume nonflat well rounded indurated 2-38-75 millimeter mixed fragments; noneffervescent; strongly acid, pH 5.4, pH indicator strip; clear smooth boundary. Lab sample # 05N00063; moist when described; observed in cut, beveled. Horizontal lamallae 5 to 15mm thick (iron and clay) with dry color 2.5YR 5/6 and moist color 2.5YR 4/4.
    E and Bt2—159 to 200 centimeters (62.6 to 78.7 inches); yellowish brown (10YR 5/8) broken face, brownish yellow (10YR 6/8) broken face, dry; loamy sand; 4 percent clay; structureless massive; loose, loose, nonsticky, nonplastic; moderately rapid permeability; 0.5 very fine roots and 1.0 medium roots and 0.5 fine roots and 1.0 coarse roots; 4.0 very fine interstitial and 2.0 fine interstitial pores; 1 percent by volume nonflat well rounded indurated 75-162-250 millimeter mixed fragments and 2 percent by volume nonflat well rounded indurated 2-38-75 millimeter mixed fragments; noneffervescent; strongly acid, pH 5.4, pH indicator strip. Lab sample # 05N00064; moist when described; observed in cut, beveled. Horizontal lamallae 1 to 4mm thick (iron) with dry color 7.5YR 5/8 and moist color 5YR 5/8.