IDENTIFIERS

  • Current Taxon Name (Soil Name): Atwell
  • OSD
  • Series Extent
  • User Site ID: S1981CA605REDW003
  • User Pedon ID: S10CA023013
  • Vegetation Plot ID: S1981CA605REDW003
  • Lab Information:
  • Certified Lab Pedon Description - no
  • Lab Source ID - SSL
  • Lab Pedon # - 10N0684
  • NCSS Pedon Lab Data NASIS Record ID - 43152
  • Print Date: 9/24/2024

    • 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: 41.2310371
  • Std. Longitude: -123.9972839
  • Datum: WGS84
  • Township: 10N
  • Range: 2E
  • Section: 30
  • PLSS Details: southeast quarter, northwest quarter
  • Location Description: Redwood National Park, Humboldt County, California; located approximately 61 meters north of Miller Creek, 49 meters west of C-road.
  • Map Unit: 531—Atwell-Coppercreek complex, 30 to 50 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-B8—Bald Hills, California

    • PEDON

  • Describers Name: Jim Popenoe
  • Current Taxonomic Class: Fine, mixed, active, isomesic Oxyaquic Hapludalfs
  • Current Taxon Kind: series
  • Pedon Type: OSD pedon
  • Pedon Purpose: full pedon description
  • Pedon Record Orgin: NASIS
  • Pedon #: 13
  • Correlated Information:
  • Soil Name - Atwell
  • PSC - 29 to 79 cm.
  • Classificaton Date - 4/12/2010
  • Soil Taxonomic Edition - eighth edition
  • Moisture Class - udic
  • Moisture Subclass - oxyaquic
  • Sampled As Information:
  • Soil Name - Atwell
  • Taxonomic Class - Fine, mixed, active, isomesic Oxyaquic Hapludalf
  • Taxon Kind - series
  • Classificaton Date - 4/13/1981
  • Dynamic Soil Properties:
  • Erosion Class - 0
  • Pedoderm Loose Cover Indicator - no
  • Hydric: no


    • SITE

  • Parent Material: earthflow deposits derived from sandstone and shale
  • Landscape: mountains
  • Landform: earthflow on mountain slope
  • Geomorphic Component Mountains: mountainflank, lower third
  • Hill Slope Profile: backslope
  • Slope Complexity: simple
  • Slope Shape Across: linear
  • Slope Shape Down: linear
  • Runoff: medium
  • Drainage Class: moderately well
  • Flooding: none flooding
  • Ponding: none ponding
  • Wet Soil Moisture Duration: 30
  • Bedrock: sandstone and shale
  • Geology: Franciscan Formation formation.
  • Surface Fragments:
  • Benchmark Soil?: no

    • VEGETATION

    SITE OBSERVATION

  • Observation Date: 4/13/1981 (actual site observation date)
  • Air Photo ID: 7-48
  • Surface Water Kind: none observed
  • Plant Association Name: Redwood 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

    LIDE3

    VAOV2

    SESE3

    PSME

    TSHE

    ABGR

    RHODO

    VAPA

    MANE2

    GASH

    POMU

    OXOR

    BLSP

    VISE3

    TROV2

    Lithocarpus densiflorus

    Vaccinium ovatum

    Sequoia sempervirens

    Pseudotsuga menziesii

    Tsuga heterophylla

    Abies grandis

    Rhododendron

    Vaccinium parvifolium

    Mahonia nervosa

    Gaultheria shallon

    Polystichum munitum

    Oxalis oregana

    Blechnum spicant

    Viola sempervirens

    Trillium ovatum

    tanoak

    California huckleberry

    redwood

    Douglas-fir

    western hemlock

    grand fir

    rhododendron

    red huckleberry

    Cascade barberry

    salal

    western swordfern

    redwood-sorrel

    deer fern

    evergreen violet

    Pacific trillium

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

    mollic epipedon

    argillic horizon

    aquic conditions

    5—29

    17—81

    81—205

    —24—

    —52—

    —124—
    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

    30

    —

    —

    213

    —

    240

    2160

    —

    285

    12

    14

    9

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    Oi—0 to 5 centimeters (0.0 to 2.0 inches); slightly decomposed plant material; fragments.; 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, grayish brown (10YR 5/2) broken face, dry; silt loam; 25 percent clay; moderate very fine subangular blocky, and moderate medium granular structure; firm, slightly sticky, slightly plastic; moderately slow permeability; 10.0 very fine roots and 4.0 medium roots and 10.0 fine roots; 10.0 fine irregular pores; 10 percent by volume moderately coherent cemented 2-38-75 millimeter sandstone-shale fragments; noneffervescent; slightly acid, pH 6.5, hellige-truog; clear wavy boundary. Lab sample # 10N03127; moist when described; observed in pit, small
    AB—17 to 29 centimeters (6.7 to 11.4 inches); brown (10YR 4/3) broken face, brown (10YR 5/3) broken face, dry; clay loam; 33 percent clay; moderate medium subangular blocky structure; firm, moderately sticky, slightly plastic; moderately slow permeability; 4.0 very fine roots and 4.0 medium roots and 4.0 fine roots and 0.5 coarse roots; 4.0 very fine tubular and 4.0 fine irregular pores; 10 percent by volume moderately coherent cemented 2-38-75 millimeter sandstone-shale fragments; noneffervescent; moderately acid, pH 6.0, hellige-truog; clear wavy boundary. Lab sample # 10N03128; moist when described; observed in pit, small
    BAt—29 to 59 centimeters (11.4 to 23.2 inches); dark yellowish brown (10YR 4/4) broken face, yellowish brown (10YR 5/4) broken face, dry; clay loam; 35 percent clay; moderate coarse subangular blocky parts to moderate medium subangular blocky structure; firm, moderately sticky, moderately plastic; moderately slow permeability; 4.0 very fine roots and 10.0 medium roots and 4.0 fine roots and 4.0 coarse roots; 4.0 very fine tubular and 4.0 medium tubular and 4.0 fine tubular and 0.5 fine irregular pores; 37 percent faint clay films on all faces of peds; 10 percent by volume moderately coherent cemented 2-38-75 millimeter sandstone-shale fragments; noneffervescent; moderately acid, pH 6.0, hellige-truog; clear irregular boundary. Lab sample # 10N03129; moist when described; observed in pit, small
    Bt—59 to 81 centimeters (23.2 to 31.9 inches); light olive brown (2.5Y 5/4) broken face, pale yellow (2.5Y 7/4) broken face, dry; very gravelly clay loam; 50 percent clay; moderate medium subangular blocky structure; firm, moderately sticky, very plastic; very slow permeability; 4.0 very fine roots and 4.0 fine roots; 0.5 very fine tubular and 0.5 fine tubular pores; 15 percent distinct clay films on all faces of peds; 35 percent by volume moderately coherent cemented 2-38-75 millimeter sandstone-shale fragments; noneffervescent; moderately acid, pH 6.0, hellige-truog; clear wavy boundary. Lab sample # 10N03130; wet when described; observed in pit, small
    2Cg1—81 to 103 centimeters (31.9 to 40.6 inches); greenish gray (5GY 5/1) broken face, light gray (N 7/), broken face, dry; clay; 50 percent clay; structureless massive; firm, moderately sticky, very plastic; very slow permeability; 0.5 very fine roots and 0.5 fine roots; 0.5 very fine tubular and 0.5 fine tubular pores; 25 percent medium prominent strong brown (7.5YR 5/6), moist, and reddish yellow (7.5YR 6/6), dry, masses of oxidized iron in matrix and 75 percent greenish gray (5GY 5/1), moist, and light gray (N 7/), dry, reduced matrix in matrix; 10 percent by volume moderately coherent cemented 2-38-75 millimeter sandstone-shale fragments; noneffervescent; moderately acid, pH 6.0, hellige-truog; clear smooth boundary. Lab sample # 10N03131; wet when described; observed in pit, small
    2Cg2—103 to 155 centimeters (40.6 to 61.0 inches); dark bluish gray (5B 4/1) broken face, gray (N 6/), broken face, dry; clay; 50 percent clay; structureless massive; very firm, moderately sticky, very plastic; very slow permeability; 0.5 very fine roots and 0.5 fine roots; 0.5 very fine tubular and 0.5 fine tubular pores; 15 percent medium prominent yellowish brown (10YR 5/4), moist, and brownish yellow (10YR 6/6), dry, masses of oxidized iron in matrix and 85 percent dark bluish gray (5B 4/1), moist, and gray (N 6/), dry, reduced matrix in matrix; 10 percent by volume moderately coherent cemented 2-38-75 millimeter sandstone-shale fragments; noneffervescent; slightly acid, pH 6.5, hellige-truog; diffuse smooth boundary. Lab sample # 10N03132; wet when described; observed in pit, small
    2Cg3—155 to 205 centimeters (61.0 to 80.7 inches); black (5Y 2.5/1) broken face, gray (N 5/), broken face, dry; clay; 50 percent clay; structureless massive; very firm, moderately sticky, very plastic; very slow permeability; 0.5 very fine roots and 0.5 fine roots; 0.5 very fine tubular and 0.5 fine tubular pores; 70 percent slickensides (pedogenic); 15 percent medium prominent yellowish brown (10YR 5/4), moist, and brownish yellow (10YR 6/6), dry, masses of oxidized iron in matrix and 85 percent black (5Y 2.5/1), moist, and gray (N 5/), dry, reduced matrix in matrix; 10 percent by volume moderately coherent cemented 2-38-75 millimeter sandstone-shale fragments; noneffervescent; slightly acid, pH 6.5, hellige-truog.; wet when described; observed in pit, small