IDENTIFIERS

  • Current Taxon Name (Soil Name): Stillwell
  • OSD
  • Series Extent
  • User Site ID: S1991-TX043-115-copy
  • User Pedon ID: S1991-TX043-115-copy
  • Vegetation Plot ID: S1991-TX043-115-copy
  • Lab Information:
  • Certified Lab Pedon Description - yes
  • Lab Source ID - SSL
  • Lab Pedon # - 91P0498
  • NCSS Pedon Lab Data NASIS Record ID - 63540
  • Print Date: 11/24/2024

    • 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: 29.3327770
  • Std. Longitude: -103.6130524
  • Datum: WGS84
  • Location Description: From the old Terlingua Store on Tex Hwy 170 west of Study Butte; 1.0 miles north on South County Road, 0.55 miles west on road to Sawmill Mountain, then 40 feet south of road in range; (100 yards west of junction to old Terlingua Ghost town)
  • Country: US—United States
  • State: Texas
  • County: TX043—Brewster
  • MLRA: 42—Southern Desertic Basins, Plains, and Mountains
  • Non-MLRA Soil Survey Area: TX622—Brewster County, Texas (Main Part)
  • 7.5 Minute USGS Quad: 29103-C5—Terlingua, Texas

    • PEDON

  • Describers Name: Rex Cochran and Stan Albee
  • Current Taxonomic Class: Loamy-skeletal, carbonatic, hyperthermic Sodic Haplocalcids
  • Current Taxon Kind: series
  • Pedon Purpose: full pedon description
  • Pedon Record Orgin: NASIS
  • Pedon #: 115
  • Correlated Information:
  • Soil Name - Stillwell
  • PSC - 25 to 100 cm.
  • Classificaton Date - 1/28/2010
  • Soil Taxonomic Edition - eleventh edition
  • Moisture Class - aridic (torric)
  • Moisture Subclass - typic
  • Sampled As Information:
  • Soil Name - Nickel
  • Classificaton Date - 2/1/1991
  • Dynamic Soil Properties:
  • Erosion Class - 1
  • Pedoderm Loose Cover Indicator - no
  • Hydric: no
  • Certification Status: certified
  • QC Status: level 1


    • SITE

  • Parent Material: gravelly alluvium derived from limestone
  • Landscape: piedmont slope
  • Landform: fan remnant
  • Slope Position: middle third
  • Slope Shape Across: linear
  • Slope Shape Down: concave
  • Runoff: medium
  • Drainage Class: well
  • Surface Fragments: 85.00 percent nonflat subangular indurated 2- to 75-millimeter limestone, unspecified,
  • Benchmark Soil?: no

    • VEGETATION

    SITE OBSERVATION

  • Observation Date: 2/1/1991 (actual site observation date)
  • Surface Cover Properties:
  • 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

    ACCOC

    AGLE

    FOSP2

    LATR2

    Acacia constricta var. constricta

    Agave lechuguilla

    Fouquieria splendens

    Larrea tridentata

    whitethorn acacia

    lechuguilla

    ocotillo

    creosote bush

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    —

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

    ochric epipedon

    calcic horizon

    0—25

    18—94

    —-

    —-
    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

    3

    —

    609.6

    865.6

    —

    45

    280

    828

    —

    20.5

    —

    —

    —

    —

    —

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    PRISM

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    A1—0 to 5 centimeters (0.0 to 2.0 inches); pale brown (10YR 6/3), yellowish brown (10YR 5/4), moist; very gravelly sandy loam; moderate medium granular structure; slightly hard, very friable; 3.0 very fine and fine roots throughout; 2 percent by volume nonflat 75-163-250 millimeter limestone, unspecified fragments and 33 percent by volume nonflat 2-39-75 millimeter limestone, unspecified fragments; very gravelly sandy loam of Field texture class; violent effervescence, by hcl, 1n; abrupt smooth boundary. Lab sample # 91P02849
    A2—5 to 18 centimeters (2.0 to 7.1 inches); light yellowish brown (10YR 6/4), dark yellowish brown (10YR 4/4), moist; very gravelly sandy loam; moderate medium granular structure; slightly hard, very friable; 3.0 very fine and fine roots throughout; 40 percent by volume nonflat 2-39-75 millimeter limestone, unspecified fragments; very gravelly sandy loam of Field texture class; violent effervescence, by hcl, 1n; abrupt wavy boundary. Lab sample # 91P02850
    Bk1—18 to 33 centimeters (7.1 to 13.0 inches); very pale brown (10YR 8/4), yellowish brown (10YR 5/4), moist; very gravelly sandy loam; weak fine subangular blocky structure; hard, friable; 3.0 very fine and fine roots throughout; 40 percent by volume nonflat 2-39-75 millimeter limestone, unspecified fragments; very gravelly sandy loam of Field texture class; violent effervescence, by hcl, 1n; abrupt wavy boundary. Lab sample # 91P02851
    Bk2—33 to 64 centimeters (13.0 to 25.2 inches); light gray (10YR 7/2), light yellowish brown (10YR 6/4), moist; very gravelly sandy loam; weak fine subangular blocky structure; hard, friable; 3.0 very fine and fine roots throughout; 20 percent by volume nonflat 2-39-75 millimeter limestone, unspecified fragments; very gravelly sandy loam of Field texture class; violent effervescence, by hcl, 1n; clear wavy boundary. Lab sample # 91P02852
    Bk3—64 to 94 centimeters (25.2 to 37.0 inches); pink (7.5YR 7/4), brown (7.5YR 5/4), moist; very gravelly sandy loam; weak granular structure; soft, very friable; 0.5 very fine and fine roots throughout; 5 percent by volume nonflat 75-163-250 millimeter limestone, unspecified fragments and 65 percent by volume nonflat 2-39-75 millimeter limestone, unspecified fragments; very gravelly sandy loam of Field texture class; violent effervescence, by hcl, 1n; gradual wavy boundary. Lab sample # 91P02853
    C1—94 to 152 centimeters (37.0 to 59.8 inches); pink (7.5YR 7/4), brown (7.5YR 5/4), moist; extremely gravelly sandy loam; soft, very friable; 0.5 very fine and fine roots throughout; 15 percent by volume nonflat 75-163-250 millimeter limestone, unspecified fragments and 70 percent by volume nonflat 2-39-75 millimeter limestone, unspecified fragments; extremely gravelly sandy loam of Field texture class; strong effervescence, by hcl, 1n; diffuse wavy boundary. Lab sample # 91P02854
    C2—152 to 200 centimeters (59.8 to 78.7 inches); pink (7.5YR 7/4), brown (7.5YR 5/4), moist; extremely gravelly sandy loam; soft, very friable; 3 percent by volume nonflat 250-425-600 millimeter limestone, unspecified fragments and 15 percent by volume nonflat 75-163-250 millimeter limestone, unspecified fragments and 70 percent by volume nonflat 2-39-75 millimeter limestone, unspecified fragments; extremely gravelly sandy loam of Field texture class; strong effervescence, by hcl, 1n. Lab sample # 91P02855