IDENTIFIERS

  • Current Taxon Name (Soil Name): DeCoty
  • OSD
  • Series Extent
  • User Site ID: S1993-TX377-003
  • User Pedon ID: S1993-TX377-003
  • Vegetation Plot ID: 29103-G8-091
  • Lab Information:
  • Certified Lab Pedon Description - yes
  • Lab Source ID - TAMU
  • Lab Pedon # - S93TX377003
  • NCSS Pedon Lab Data NASIS Record ID - 45493
  • Print Date: 12/6/2025

    • 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: 29.8229528
  • Std. Longitude: -103.9197000
  • Datum: WGS84
  • Location Description: Presidio County, Texas; from the intersection of US Highways 67 and 90 in Marfa, 7.3 miles south on US highway 67 to intersection with RM 169, 24.6 miles southeast on RM 169 to end of pavement, 3.2 miles south on Casa Piedra road to intersection with Puerto Potrillo Road, 4.0 miles east on Puerto Potrillo Road to intersection with ranch road, 1.8 miles southeast and east on ranch road, then 100 feet south in range
  • Map Unit: SEE—Sauceda-Decoty complex, 1 to 20 percent slopes
  • Country: US—United States
  • State: Texas
  • County: TX377—Presidio
  • MLRA: 42—Southern Desertic Basins, Plains, and Mountains
  • MLRA Soil Survey Area: SW-MAF—Marfa, Texas
  • Non-MLRA Soil Survey Area: TX377—Presidio County, Texas
  • 7.5 Minute USGS Quad: 29103-G8—Puerto Potrillo, Texas

    • PEDON

  • Describers Name: Rex Cochran
  • Current Taxonomic Class: Loamy-skeletal, mixed, superactive, thermic Lithic Ustic Haplocalcids
  • Current Taxon Kind: series
  • Pedon Type: OSD pedon
  • Pedon Purpose: laboratory sampling site
  • Pedon Record Orgin: NASIS
  • Correlated Information:
  • Soil Name - DeCoty
  • PSC - 0 to 36 cm.
  • Classificaton Date - 12/14/2020
  • Classifier - Lynn Loomis
  • Soil Taxonomic Edition - twelfth edition
  • Moisture Class - aridic (torric)
  • Moisture Subclass - ustic
  • Sampled As Information:
  • Soil Name - DeCoty
  • Classificaton Date - 4/26/1993
  • Dynamic Soil Properties:
  • Pedoderm Loose Cover Indicator - no
  • Hydric: no
  • Certification Status: certified
  • QC Status: level 1


    • SITE

  • Parent Material: gravelly residuum weathered from ignimbrite
  • Drainage Class: well
  • Flooding: none flooding
  • Ponding: none ponding
  • Bedrock: indurated ignimbrite at 36cm
  • Geology: Mitchell Mesa Ignimbrite formation.
  • Surface Fragments: 80.00 percent 2- to 75-millimeter ignimbrite, 10.00 percent 75- to 250-millimeter ignimbrite,
  • Benchmark Soil?: no

    • VEGETATION

    SITE OBSERVATION

  • Observation Date: 5/25/1993 (actual site observation date)
  • Air Photo ID: J8
  • Surface Cover Properties:
  • Site Obs. Cover Kind 1 - shrub cover
  • Site Obs. Cover Kind 2 - rangeland, shrubby
  • 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

    PAIN2

    AGLE

    DASYL

    UNKNOWN

    MATR3

    DAFR2

    EPHED

    Parthenium incanum

    Agave lechuguilla

    Dasylirion

    unknown scientific name

    Mahonia trifoliolata

    Dalea frutescens

    Ephedra

    mariola

    lechuguilla

    sotol

    unknown national vernacular name

    algerita

    black prairie clover

    jointfir

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    Pedon Restrictions
    Kind Hardness Restriction Depth L-H Restriction Thickness L-RV-H
    cm

    bedrock, lithic

    indurated

    36 - 200

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

    ochric epipedon

    calcic horizon

    lithic contact

    0—13

    13—36

    36—36

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    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

    18

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    0

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    A—0 to 13 centimeters (0.0 to 5.1 inches); brown (7.5YR 5/3), dark brown (7.5YR 3/3), moist; very gravelly fine sandy loam; 54 percent sand; 34 percent silt; 12 percent clay; weak medium granular structure; slightly hard, very friable; 45 percent carbonate coats on rock fragments; 45 percent by volume nonflat subangular indurated 2-15-75 millimeter igneous, unspecified fragments; strong effervescence, by hcl, 1n; slightly alkaline, pH 7.5, pH meter; abrupt smooth boundary. Lab sample # TAMU4754; observed in pit, small
    Bk—13 to 36 centimeters (5.1 to 14.2 inches); pinkish gray (7.5YR 7/2) and brown (7.5YR 5/3) extremely cobbly sandy loam; 50 percent sand; 38 percent silt; 12 percent clay; weak fine and medium subangular blocky structure; slightly hard, very friable; 80 percent carbonate coats on rock fragments; 20 percent by volume nonflat subangular indurated 2-15-75 millimeter igneous, unspecified fragments and 50 percent by volume nonflat subangular indurated 75-150-250 millimeter igneous, unspecified fragments; strong effervescence, by hcl, 1n; slightly alkaline, pH 7.5, pH meter; abrupt wavy boundary. Lab sample # TAMU4755; observed in pit, small
    R—36 to 200 centimeters (14.2 to 78.7 inches); bedrock; indurated; fragments. Lab sample # TAMU4756; observed in pit, small. Fractured Mitchell Mesa Ignimbrite. Carbonates on surface and in fractures