IDENTIFIERS

  • Current Taxon Name (Soil Name): Surpur
  • OSD
  • Series Extent
  • User Site ID: S1986CA605REDW019
  • User Pedon ID: S10CA023026
  • Vegetation Plot ID: S1986CA605REDW019
  • Lab Information:
  • Certified Lab Pedon Description - no
  • Lab Source ID - SSL
  • Lab Pedon # - 10N0697
  • NCSS Pedon Lab Data NASIS Record ID - 58623
  • 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: 41.2451222
  • Std. Longitude: -124.0581333
  • Datum: WGS84
  • Township: 10N
  • Range: 1E
  • Section: 16
  • PLSS Details: southeast quarter, southeast quarter
  • Location Description: Redwood National Park, Humboldt County, California; approximately 137 meters northeast of L-2 road, 0.02 kilometers south of junction with L-2-2 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-B1—Rodgers Peak, California

    • PEDON

  • Describers Name: Jim Popenoe
  • Current Taxonomic Class: Fine-silty, mixed, active, isomesic Typic Haplohumults
  • Current Taxon Kind: series
  • Pedon Type: representative pedon for component
  • Pedon Purpose: full pedon description
  • Pedon Record Orgin: NASIS
  • Pedon #: 26
  • Correlated Information:
  • Soil Name - Surpur
  • PSC - 57 to 107 cm.
  • Classificaton Date - 4/12/2010
  • Soil Taxonomic Edition - eighth edition
  • Moisture Class - udic
  • Moisture Subclass - typic
  • Sampled As Information:
  • Soil Name - Empire
  • Classificaton Date - 7/29/1986
  • Dynamic Soil Properties:
  • Erosion Class - 0
  • Pedoderm Loose Cover Indicator - no
  • Hydric: no


    • SITE

  • Parent Material: marine deposits
  • 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: medium
  • Drainage Class: well
  • Flooding: none flooding
  • Ponding: none ponding
  • Geology: Marine Sediments formation.
  • Surface Fragments:
  • Benchmark Soil?: no

    • VEGETATION

    SITE OBSERVATION

  • Observation Date: 7/29/1986 (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 - conifers
  • 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

    ALRU2

    BAPI

    GASH

    IRIS

    PSME

    PTAQ

    RHMA3

    RUPA

    SESE3

    TSHE

    VAOV2

    VAPA

    WHMO

    Alnus rubra

    Baccharis pilularis

    Gaultheria shallon

    Iris

    Pseudotsuga menziesii

    Pteridium aquilinum

    Rhododendron macrophyllum

    Rubus parviflorus

    Sequoia sempervirens

    Tsuga heterophylla

    Vaccinium ovatum

    Vaccinium parvifolium

    Whipplea modesta

    red alder

    coyotebrush

    salal

    iris

    Douglas-fir

    western brackenfern

    Pacific rhododendron

    thimbleberry

    redwood

    western hemlock

    California huckleberry

    red huckleberry

    common whipplea

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

    ochric epipedon

    argillic horizon

    0—36

    36—85

    —47—

    —48—
    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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    347

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    280

    2150

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    275

    11

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    Oi—0 to 5 centimeters (0.0 to 2.0 inches); slightly decomposed plant material; slightly sticky, slightly plastic; fragments; noneffervescent; abrupt wavy boundary.; slightly moist when described; observed in pit, small
    A—5 to 17 centimeters (2.0 to 6.7 inches); dark brown (10YR 3/3) broken face, brown (10YR 5/3) broken face, dry; loam; 20 percent clay; weak fine granular, and weak medium subangular blocky structure; slightly hard, very friable, slightly sticky, slightly plastic; moderate permeability; 10.0 very fine roots and 0.5 medium roots and 4.0 fine roots; 4.0 very fine interstitial and 4.0 very fine tubular pores; 6 percent by volume rounded 2-38-75 millimeter mixed fragments; noneffervescent; strongly acid, pH 5.5, hellige-truog; clear wavy boundary. Lab sample # 10N03200; slightly moist when described; observed in pit, small
    AB—17 to 36 centimeters (6.7 to 14.2 inches); dark yellowish brown (10YR 4/4) broken face, light yellowish brown (10YR 6/4) broken face, dry; loam; 22 percent clay; moderate coarse subangular blocky parts to moderate medium subangular blocky structure; slightly hard, friable, slightly sticky, slightly plastic; moderate permeability; 10.0 very fine roots and 0.5 medium roots and 10.0 fine roots and 0.5 coarse roots; 0.5 very fine interstitial and 4.0 medium tubular and 4.0 fine tubular pores; 8 percent by volume rounded 2-38-75 millimeter mixed fragments; noneffervescent; strongly acid, pH 5.5, hellige-truog; clear wavy boundary. Lab sample # 10N03201; slightly moist when described; observed in pit, small
    BA—36 to 57 centimeters (14.2 to 22.4 inches); yellowish brown (10YR 5/6) broken face, pale yellow (2.5Y 7/4) broken face, dry; silt loam; 26 percent clay; weak very coarse subangular blocky structure; hard, firm, slightly sticky, slightly plastic; moderate permeability; 10.0 very fine roots and 4.0 medium roots and 10.0 fine roots and 0.5 coarse roots; 4.0 very fine tubular and 0.5 medium tubular and 0.5 fine tubular pores; 4 percent by volume rounded 2-38-75 millimeter mixed fragments; noneffervescent; very strongly acid, pH 5.0, hellige-truog; gradual wavy boundary. Lab sample # 10N03202; slightly moist when described; observed in pit, small
    Bt—57 to 85 centimeters (22.4 to 33.5 inches); variegated yellowish brown (10YR 5/6) broken face, pale yellow (2.5Y 7/4) broken face, dry; silty clay loam; 28 percent clay; weak very coarse subangular blocky structure; slightly hard, firm, slightly sticky, slightly plastic; moderate permeability; 4.0 very fine roots and 0.5 medium roots and 4.0 fine roots and 0.5 coarse roots; 4.0 very fine tubular and 0.5 fine tubular pores; 7 percent faint clay films on all faces of peds and 8 percent faint clay films on surfaces along pores; 1 percent medium prominent strong brown (7.5YR 5/8), dry, and strong brown (7.5YR 5/8), moist, masses of oxidized iron in matrix; 4 percent by volume rounded 2-38-75 millimeter mixed fragments; noneffervescent; very strongly acid, pH 5.0, hellige-truog; abrupt irregular boundary. Lab sample # 10N03203; slightly moist when described; observed in pit, small
    2C—85 to 113 centimeters (33.5 to 44.5 inches); brownish yellow (10YR 6/6) broken face, very pale brown (10YR 7/4) broken face, dry; clay loam; 30 percent clay; structureless massive; hard, very friable, slightly sticky, slightly plastic; moderate permeability; 0.5 very fine roots; 0.5 very fine interstitial and 0.5 very fine tubular pores; 8 percent by volume rounded 2-38-75 millimeter mixed fragments; noneffervescent; strongly acid, pH 5.5, hellige-truog; clear wavy boundary. Lab sample # 10N03204; slightly moist when described; observed in pit, small
    3C1—113 to 140 centimeters (44.5 to 55.1 inches); strong brown (7.5YR 5/8) broken face, yellow (10YR 7/8) broken face, dry; clay loam; 28 percent clay; structureless massive; soft, firm, slightly sticky, slightly plastic; moderate permeability; 0.5 very fine roots; 0.5 very fine tubular and 0.5 fine tubular pores; 6 percent by volume rounded 2-38-75 millimeter mixed fragments; noneffervescent; strongly acid, pH 5.5, hellige-truog; diffuse smooth boundary. Lab sample # 10N03205; moist when described; observed in pit, small
    3C2—140 to 176 centimeters (55.1 to 69.3 inches); variegated brownish yellow (10YR 6/6) broken face, yellow (10YR 7/6) broken face, dry; loam; 26 percent clay; structureless massive; slightly hard, friable, slightly sticky, slightly plastic; moderate permeability; 0.5 very fine tubular pores; 15 percent faint clay films on surfaces along pores; 11 percent medium distinct reddish yellow (7.5YR 6/8), dry, and yellowish red (5YR 5/6), moist, masses of oxidized iron in matrix; 14 percent by volume rounded 2-38-75 millimeter mixed fragments; noneffervescent; strongly acid, pH 5.5, hellige-truog; gradual smooth boundary. Lab sample # 10N03206; moist when described; observed in pit, small
    3C3—176 to 199 centimeters (69.3 to 78.3 inches); variegated light brownish gray (2.5Y 6/2) broken face, very pale brown (10YR 8/4) broken face, dry; silty clay loam; 30 percent clay; structureless massive; soft, friable, slightly sticky, slightly plastic; moderate permeability; 0.5 very fine tubular pores; 17 percent faint clay films between sand grains and 18 percent faint clay films on surfaces along pores; 25 percent medium prominent red (2.5YR 4/8), dry, and red (2.5YR 4/8), moist, masses of oxidized iron in matrix; 11 percent by volume rounded 2-38-75 millimeter mixed fragments; noneffervescent; strongly acid, pH 5.5, hellige-truog. Lab sample # 10N03207; moist when described; observed in pit, small