IDENTIFIERS

  • Current Taxon Name (Soil Name): Bigtop
  • OSD
  • Series Extent
  • User Site ID: 02-JFD-05
  • User Pedon ID: 02OR035006
  • User Site Association ID: OR683 point data
  • Lab Information:
  • Certified Lab Pedon Description - no
  • Lab Source ID - SSL
  • Lab Pedon # - 02N0459
  • NCSS Pedon Lab Data NASIS Record ID - 14124
  • Print Date: 7/11/2025

    • 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: 42.6070633
  • Std. Longitude: -121.3674850
  • Datum: WGS84
  • Township: 34 S.
  • Range: 11 E.
  • Section: 24
  • PLSS Details: about 300 feet east and 1950 feet north of the southwest corner
  • Location Description: South of Teddy Powers Meadow, about 2 miles north and 27 miles east of Chiloquin; about 2200 feet west of FS Road #4466
  • Map Unit: 1090—Bigtop-Shortnap complex, 0 to 2 percent slopes
  • Country: US—United States
  • State: Oregon
  • County: OR035—Klamath
  • MLRA: 6—Cascade Mountains, Eastern Slope
  • Non-MLRA Soil Survey Area: OR683—Winema National Forest Area, Oregon
  • 7.5 Minute USGS Quad: 42121-E3—Spodue Mountain, Oregon

    • PEDON

  • Describers Name: Nicita, Eric
  • Current Taxonomic Class: Fine, smectitic Aquandic Cryaquolls
  • Current Taxon Kind: series
  • Pedon Type: OSD pedon
  • Pedon Purpose: laboratory sampling site
  • Pedon Record Orgin: NASIS
  • Pedon #: 6
  • Correlated Information:
  • Soil Name - Bigtop (flagged as OSD)
  • PSC - 65 to 77 cm.
  • Classificaton Date - 4/4/2013
  • Classifier - Gebauer, Chris
  • Soil Taxonomic Edition - eleventh edition
  • Moisture Class - aquic
  • Moisture Subclass - xeric
  • Sampled As Information:
  • Soil Name - Bigtoe
  • Taxonomic Class - Fine, smectitic, frigid Aquandic Argialbolls
  • PSC - 65 to 77 cm.
  • Classificaton Date - 6/9/2002
  • Soil Taxonomic Edition - eighth edition
  • Moisture SUBClass - aquic
  • Dynamic Soil Properties:
  • Pedoderm Loose Cover Indicator - no
  • Hydric: no


    • SITE

  • Parent Material: alluvium, including coarse pumiceous volcanic ash and pumiceous tephra, over residuum derived from volcanic rock
  • Landscape: lava plateau
  • Landform: depression on lava flow
  • Slope Complexity: simple
  • Slope Shape Across: convex
  • Slope Shape Down: linear
  • Drainage Class: poorly
  • Flooding: frequent flooding
  • Ponding: none ponding
  • Bedrock: indurated basalt at 92cm
  • Surface Fragments:
  • Benchmark Soil?: no

    • VEGETATION

  • Other Vegetative Class: MD - Dry meadow series—Pacific Northwest Ecoclass Codes (PNW-GTR-418)

    • SITE OBSERVATION

  • Observation Date: 6/9/2002 (actual site observation date)
  • Surface Water Kind: none observed
  • Surface Cover Properties:
  • Site Obs. Cover Kind 1 - grass/herbaceous cover
  • Pedoderm Loose Cover Indicator - no
  • Drained? - no
  • Bedded Soil? - no
  • Forest Plantation? - no
    • Pedon Restrictions
    Kind Hardness Restriction Depth L-H Restriction Thickness L-RV-H
    cm

    abrupt textural change

    duripan

    bedrock, lithic

    noncoherent

    strongly coherent

    indurated

    65 -

    77 - 92

    92 - 200

    —

    - 15 -

    - 108 -

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

    mollic epipedon

    aquic conditions

    volcanic glass

    episaturation

    albic horizon

    slickensides

    abrupt textural change

    argillic horizon

    duripan

    lithic contact

    2—39

    2—77

    2—65

    2—77

    59—65

    65—77

    65—

    65—77

    77—92

    92—

    —37—

    —75—

    —63—

    —75—

    —6—

    —12—

    —-

    —12—

    —15—

    —-
    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

    —

    —

    1491

    —

    150

    560

    —

    10

    5.3

    —

    —

    —

    —

    —

    —

    —

    —

    —

    —
    Oe—0 to 2 centimeters (0.0 to 0.8 inches); mucky peat; low excavation difficulty; fragments; abrupt broken boundary.; moist when described; observed in pit, small
    A—2 to 39 centimeters (0.8 to 15.4 inches); very dark grayish brown (10YR 3/2) broken face, grayish brown (10YR 5/2) broken face, dry; ashy sandy clay loam; 56 percent sand; 25 percent clay; moderate coarse subangular blocky parts to moderate fine granular structure; slightly hard, very friable, slightly sticky, slightly plastic; low excavation difficulty; 10.0 very fine roots throughout and 3.0 fine roots throughout; 3.0 very fine low-continuity interstitial and 3.0 very fine low-continuity tubular and 3.0 fine moderate-continuity tubular pores; 1 percent fine distinct spherical strongly coherent cemented dark brown (10YR 3/3), moist, and yellowish brown (10YR 5/4), dry, iron-manganese concretions throughout and 5 percent fine prominent cylindrical extremely weakly coherent cemented brown (7.5YR 4/4), moist, and reddish yellow (7.5YR 6/8), dry, iron-manganese masses infused into matrix adjacent to pores; 1 percent fine distinct spherical strongly coherent cemented dark brown (10YR 3/3), moist, and yellowish brown (10YR 5/4), dry,; 1 percent by volume nonflat subangular moderately coherent cemented 2-10-20 millimeter pumice fragments and 1 percent by volume nonflat subangular strongly coherent cemented 2-3-5 millimeter iron-manganese nodules fragments and 2 percent by volume nonflat subangular moderately coherent cemented 2-3-5 millimeter iron-manganese nodules fragments and 3 percent by volume nonflat subangular indurated 2-40-75 millimeter volcanic, unspecified fragments; slightly acid, pH 6.2, bromthymol blue; clear wavy boundary. Lab sample # 02N02361, 02N02362; moist when described; observed in pit, small
    AE—39 to 59 centimeters (15.4 to 23.2 inches); dark grayish brown (10YR 4/2) broken face, brown (10YR 5/3) broken face, dry; paragravelly ashy sandy loam; 69 percent sand; 18 percent clay; weak medium subangular blocky structure; moderately hard, very friable, slightly sticky, slightly plastic; moderate excavation difficulty; 12.0 very fine roots throughout and 0.5 fine roots throughout; 3.0 very fine low-continuity interstitial and 0.5 very fine low-continuity tubular and 6.0 fine moderate-continuity tubular pores; 3 percent medium prominent spherical strongly coherent cemented black (2.5Y 2.5/1), moist, and very dark grayish brown (2.5Y 3/2), dry, iron-manganese concretions throughout and 5 percent medium prominent irregular moderately coherent cemented strong brown (7.5YR 4/6), moist, and reddish yellow (7.5YR 6/8), dry, iron-manganese nodules throughout; 1 percent by volume nonflat subrounded moderately coherent cemented 2-10-20 millimeter pumice fragments and 3 percent by volume nonflat subrounded strongly coherent cemented 2-3-5 millimeter iron-manganese nodules fragments and 5 percent by volume nonflat subrounded moderately coherent cemented 2-3-5 millimeter iron-manganese nodules fragments and 5 percent by volume nonflat subangular indurated 2-40-75 millimeter volcanic, unspecified fragments and 5 percent by volume nonflat subangular indurated 75-130-250 millimeter volcanic, unspecified fragments; slightly acid, pH 6.4, bromthymol blue; clear smooth boundary. Lab sample # 02N02363; wet when described; observed in pit, small
    E—59 to 65 centimeters (23.2 to 25.6 inches); dark grayish brown (10YR 4/2) broken face, light brownish gray (10YR 6/2) broken face, dry; gravelly ashy sandy loam; 60 percent sand; 18 percent clay; moderate medium subangular blocky structure; moderately hard, friable, slightly sticky, slightly plastic; moderate excavation difficulty; 0.5 very fine roots throughout and 0.1 fine roots throughout; 3.0 very fine low-continuity tubular pores; 20 percent coarse prominent irregular moderately coherent cemented strong brown (7.5YR 4/6), moist, and reddish yellow (7.5YR 6/8), dry, iron-manganese nodules throughout and 25 percent coarse prominent spherical strongly coherent cemented black (2.5Y 2.5/1), moist, and very dark grayish brown (2.5Y 3/2), dry, iron-manganese concretions throughout; 4 percent by volume nonflat subrounded indurated 2-40-75 millimeter volcanic, unspecified fragments and 5 percent by volume nonflat subangular indurated 75-160-250 millimeter volcanic, unspecified fragments and 20 percent by volume nonflat subrounded moderately coherent cemented 2-4-20 millimeter iron-manganese nodules fragments and 25 percent by volume nonflat subrounded strongly coherent cemented 2-4-20 millimeter iron-manganese nodules fragments; neutral, pH 6.6, bromthymol blue; abrupt smooth boundary.; wet when described; observed in pit, small
    2Btss—65 to 77 centimeters (25.6 to 30.3 inches); brown (7.5YR 5/2) broken face, brown (10YR 4/3) broken face, dry; gravelly silty clay; 5 percent sand; 50 percent clay; strong coarse columnar parts to strong medium wedge, and strong coarse columnar parts to strong coarse subangular blocky structure; extremely hard, extremely firm, moderately sticky, very plastic; very high excavation difficulty; 0.1 very fine roots throughout and 0.8 fine roots throughout; 3.0 very fine low-continuity tubular and 0.5 fine low-continuity irregular pores; 15 percent prominent brown (7.5YR 4/4), moist, and brown (7.5YR 5/3), dry, slickensides (pedogenic) on all faces of peds and 80 percent distinct brown (7.5YR 4/4), moist, and brown (7.5YR 5/3), dry, clay films on all faces of peds; 10 percent coarse prominent irregular noncoherent cemented dark gray (2.5Y 4/1), moist, and light gray (10YR 7/2), dry, iron depletions in matrix and 10 percent coarse prominent spherical very strongly coherent cemented black (2.5Y 2.5/1), moist, and very dark grayish brown (2.5Y 3/2), dry, iron-manganese concretions throughout and 15 percent medium prominent irregular extremely weakly coherent cemented black (2.5Y 2.5/1), moist, and very dark grayish brown (2.5Y 3/2), dry, manganese masses throughout; 2 percent by volume nonflat subrounded indurated 75-160-250 millimeter volcanic, unspecified fragments and 10 percent by volume nonflat subrounded moderately coherent cemented 2-4-20 millimeter iron-manganese nodules fragments and 15 percent by volume nonflat subrounded indurated 2-40-75 millimeter volcanic, unspecified fragments; slightly acid, pH 6.4, bromthymol blue; gradual smooth boundary.; wet when described; observed in pit, small
    2Bqm—77 to 92 centimeters (30.3 to 36.2 inches); olive brown (2.5Y 4/3) broken face, yellowish brown (10YR 5/4) broken face, dry; cemented material; strong thick platy structure; extremely hard, slightly rigid, strongly coherent by silica, nonsticky, nonplastic; extremely high excavation difficulty; 0.1 very fine roots in cracks; 3.0 very fine low-continuity tubular and 0.5 fine low-continuity interstitial pores; 5 percent fine distinct irregular strongly coherent cemented black (2.5Y 2.5/1), moist, and very dark grayish brown (10YR 3/2), dry, manganese coatings on faces of peds and 30 percent coarse distinct spherical strongly coherent cemented black (2.5Y 2.5/1), moist, and very dark grayish brown (10YR 3/2), dry, iron-manganese concretions in matrix; 80 percent fine distinct platy strongly coherent cemented brown (10YR 5/3), moist, and pink (7.5YR 7/4), dry, silica masses on faces of peds; 5 percent by volume nonflat subrounded strongly coherent cemented 2-?-30 millimeter basalt fragments; noneffervescent; neutral, pH 6.8, bromthymol blue.; moist when described; observed in pit, small
    2R—92 centimeters (36.2 inches); bedrock; indurated; fragments.; observed in pit, small