IDENTIFIERS

  • Current Taxon Name (Soil Name): Duffau
  • OSD
  • Series Extent
  • Local Phase: loamy fine sand
  • User Site ID: S2017TX497049
  • User Pedon ID: S2017TX497049
  • Vegetation Plot ID: S2017TX497049
  • Lab Information:
  • Certified Lab Pedon Description - yes
  • Lab Source ID - KSSL
  • Lab Pedon # - 17N0661
  • User Project ID: CLBJ_011_NEON
  • Project Name: LBJ National Grassland
  • Print Date: 12/7/2025
  • 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: 33.4133100
  • Std. Longitude: -97.6359900
  • Datum: WGS84
  • Map Unit: WeC—Duffau-Windthorst complex, 1 to 5 percent slopes, moderately eroded
  • Country: US—United States
  • State: Texas
  • County: TX497—Wise
  • MLRA: 84B—West Cross Timbers
  • Non-MLRA Soil Survey Area: TX497—Wise County, Texas
  • 7.5 Minute USGS Quad: 33097-D6—Smyrna, Texas
  • PEDON

  • Describers Name: Sidney Paulson
  • Current Taxonomic Class: Coarse-loamy, siliceous, active, thermic Ultic Paleustalfs
  • Current Taxon Kind: taxadjunct
  • Pedon Type: taxadjunct to the series
  • Pedon Purpose: laboratory sampling site
  • Pedon Record Orgin: NASIS
  • Sampled As Information:
  • Soil Name - Duffau
  • Taxonomic Class - Fine-loamy, siliceous, active, thermic Udic Paleustalfs
  • Taxon Kind - series
  • PSC - 39 to 89 cm.
  • Classificaton Date - 4/4/2017
  • Classifier - Chance M. Robinson
  • Soil Taxonomic Edition - twelfth edition
  • Moisture Class - ustic
  • Moisture SUBClass - udic
  • Dynamic Soil Properties:
  • Erosion Class - 1
  • Pedoderm Loose Cover Indicator - no
  • Hydric: no
  • Certification Status: certified
  • QC Status: level 1
  • QA Status: level 1


  • SITE

  • Parent Material: residuum weathered from sandstone
  • Landscape: undulating very low hills
  • Landform: moderately dissected ridge
  • Geomorphic Component Hills: side slope
  • Hill Slope Profile: backslope
  • Slope Position: middle third
  • Slope Shape Across: linear
  • Slope Shape Down: linear
  • Drainage Class: well
  • Bedrock: sandstone and siltstone
  • Geology: Paluxy member of the Antlers formation in the Trinity group.
  • Surface Fragments:
  • Benchmark Soil?: no
  • RaCA Information:
  • RaCA Site ID - CLBJ_049
  • DSP Plot ID - SW
  • Plot Baseline Azimuth - 2
  • Plot Baseline Length - 16
  • Plot Width - 40
  • Plot/Site Set Up By - Center of pit
  • Plot or Site Recorder - Alan Deubler
  • VEGETATION

    SITE OBSERVATION

  • Observation Date: 4/4/2017 (actual site observation date)
  • Data Collector: Alan Deubler
  • Surface Cover Properties:
  • Site Obs. Cover Kind 1 - grass/herbaceous cover
  • Site Obs. Cover Kind 2 - rangeland, savanna
  • 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

    DIOLS

    JUVI

    QUMA3

    QUST

    RHCOL2

    SCSC

    SMILA2

    TRFL2

    Dichanthelium oligosanthes var. scribnerianum

    Juniperus virginiana

    Quercus marilandica

    Quercus stellata

    Rhus copallinum var. latifolia

    Schizachyrium scoparium

    Smilax

    Tridens flavus

    Scribner's rosette grass

    eastern redcedar

    blackjack oak

    post oak

    winged sumac

    little bluestem

    greenbrier

    purpletop tridens

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

    ochric epipedon

    abrupt textural change

    argillic horizon

    redox concentrations

    0—39

    39—39

    39—155

    155—212

    —39—

    —0—

    —116—

    —57—

    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

    305

    279

    1011

    221

    17

    27.1

    6.5

    412334

    Decatur, TX

    Coop

    A—0 to 20 centimeters (0.0 to 7.9 inches); brown (7.5YR 4/4), dark brown (7.5YR 3/4), moist; loamy fine sand; 5 percent clay; weak fine subangular blocky structure; soft, very friable; many (5.0) very fine roots throughout and common (1.0) medium roots throughout and common (2.0) fine roots throughout; fragments; noneffervescent, by hcl, 1n; clear smooth boundary. Lab sample # 17N03328; moist when described; observed in pit, small
    E—20 to 39 centimeters (7.9 to 15.4 inches); strong brown (7.5YR 5/6), strong brown (7.5YR 4/6), moist; loamy fine sand; 6 percent clay; weak fine subangular blocky structure; soft, very friable; common (3.0) very fine roots throughout and common (1.0) medium roots throughout and common (1.0) fine roots throughout; fragments; noneffervescent, by hcl, 1n; clear wavy boundary. Lab sample # 17N03329; moist when described; observed in pit, small
    Bt1—39 to 68 centimeters (15.4 to 26.8 inches); red (2.5YR 4/6), dark red (2.5YR 3/6), moist; fine sandy loam; 29 percent clay; strong coarse prismatic parts to moderate medium subangular blocky structure; hard, firm; common (2.0) very fine roots throughout and common (1.0) fine roots throughout; 90 percent distinct clay films on all faces of peds; fragments; noneffervescent, by hcl, 1n; clear smooth boundary. Lab sample # 17N03330; moist when described; observed in pit, small
    Bt2—68 to 155 centimeters (26.8 to 61.0 inches); red (2.5YR 5/8), red (2.5YR 4/8), moist; fine sandy loam; 26 percent clay; moderate medium prismatic parts to moderate medium subangular blocky structure; hard, firm; common (1.0) very fine roots throughout and common (1.0) fine roots throughout; 70 percent distinct clay films on all faces of peds; fragments; noneffervescent, by hcl, 1n; clear smooth boundary. Lab sample # 17N03331; moist when described; observed in pit, small
    BCt—155 to 212 centimeters (61.0 to 83.5 inches); reddish yellow (5YR 6/8), yellowish red (5YR 5/8), moist; fine sandy loam; 15 percent clay; weak medium subangular blocky parts to weak fine subangular blocky structure; slightly hard, friable; very few (0.2) very fine roots throughout; 10 percent distinct clay films on vertical faces of peds; 15 percent fine distinct irregular noncoherent cemented reddish yellow (7.5YR 6/6), moist, and reddish yellow (7.5YR 7/6), dry, masses of oxidized iron with sharp boundaries throughout; fragments; noneffervescent, by hcl, 1n. Lab sample # 17N03332; dry when described; observed in auger, bucket