IDENTIFIERS

  • Current Taxon Name (Soil Name): Stillwell
  • OSD
  • Series Extent
  • User Site ID: S1991-TX043-009-copy
  • User Pedon ID: S1991-TX043-009-copy
  • Vegetation Plot ID: S1991-TX043-009-copy
  • Lab Information:
  • Certified Lab Pedon Description - yes
  • Lab Source ID - SSL
  • Lab Pedon # - 91P0464
  • NCSS Pedon Lab Data NASIS Record ID - 63507
  • 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
  • Country: US—United States
  • State: Texas
  • County: TX043—Brewster
  • MLRA: 42—Southern Desertic Basins, Plains, and Mountains
  • Regional Office: 8—Phoenix, AZ
  • 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: Converted from SSL-CMS data
  • Pedon #: 9
  • Correlated Information:
  • Soil Name - Stillwell
  • PSC - 25 to 100 cm.
  • Classificaton Date - 1/31/2019
  • Classifier - Lynn Loomis
  • Soil Taxonomic Edition - twelfth edition
  • Moisture Class - aridic (torric)
  • Moisture Subclass - typic
  • 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: upper third
  • Slope Shape Down: convex
  • Runoff: medium
  • Drainage Class: well
  • Surface Fragments: 70.00 percent nonflat subangular indurated 2- to 75-millimeter limestone, unspecified, 18.00 percent nonflat subangular indurated 75- to 250-millimeter limestone, unspecified,
  • Benchmark Soil?: no

    • VEGETATION

    SITE OBSERVATION

  • Observation Date: 2/1/1991 (actual site observation date)
  • Surface Cover Properties:
  • Site Obs. Cover Kind 1 - grass/herbaceous cover
  • Site Obs. Cover Kind 2 - rangeland, grassland
  • Pedoderm Loose Cover Indicator - no
  • Drained? - no
  • Bedded Soil? - no
  • Forest Plantation? - no
  • Site Erosion Accelerated: water erosion
    • Vegetation Plot Plants
    Plant Symbol Scientific Name National Vernacular Name Plant Type Group Canopy Cover % Vegetation Stata Level

    EUAN3

    FOSP2

    JADI

    LATR2

    OPLE

    ZIOB

    Euphorbia antisyphilitica

    Fouquieria splendens

    Jatropha dioica

    Larrea tridentata

    Opuntia leptocaulis

    Ziziphus obtusifolia

    candelilla

    ocotillo

    leatherstem

    creosote bush

    Christmas cactus

    lotebush

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

    ochric epipedon

    calcic horizon

    0—10

    10—145

    —10—

    —135—
    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

    4

    —

    —

    872

    —

    45

    280

    828

    —

    20.5

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    PRISM

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    A—0 to 10 centimeters (0.0 to 3.9 inches); pale brown (10YR 6/3), brown (10YR 5/3), moist; gravelly loam; moderate medium granular structure; slightly hard, very friable, nonsticky, nonplastic; 2.5 very fine and fine roots throughout and 0.5 medium roots throughout; 30 percent by volume nonflat subangular indurated 2-40-75 millimeter limestone, unspecified fragments; violent effervescence, by hcl, 1n; abrupt wavy boundary. Lab sample # 91P2655. effervescence is continuous
    Bk1—10 to 46 centimeters (3.9 to 18.1 inches); very pale brown (10YR 7/3), brown (10YR 5/3), moist; very gravelly sandy loam; moderate medium subangular blocky structure; very hard, friable, nonsticky, nonplastic; 2.5 very fine and fine roots throughout; 55 percent prominent carbonate coats on rock fragments; 11 percent medium irregular carbonate masses; 60 percent by volume nonflat subangular indurated 2-40-75 millimeter limestone, unspecified fragments; violent effervescence, by hcl, 1n; abrupt wavy boundary. Lab sample # 91P2656. effervescence is continuous; continuous - phpvsfiid 1046766; continuous - phpvsfiid 1046766
    Bk2—46 to 71 centimeters (18.1 to 28.0 inches); very pale brown (10YR 7/3), brown (10YR 5/3), moist; loam; moderate medium granular structure; slightly hard, very friable; 2.5 very fine and fine roots throughout; 55 percent prominent carbonate coats on rock fragments; 11 percent fine threadlike carbonate masses and 11 percent medium irregular carbonate masses; 12 percent by volume nonflat subangular indurated 2-40-75 millimeter limestone, unspecified fragments; violent effervescence, by hcl, 1n; clear wavy boundary. Lab sample # 91P2657. effervescence is continuous; continuous - phpvsfiid 1046767; continuous - phpvsfiid 1046767
    Bk3—71 to 107 centimeters (28.0 to 42.1 inches); very pale brown (10YR 7/3), brown (10YR 5/3), moist; extremely gravelly loam; moderate medium granular structure; slightly hard, friable; 0.5 very fine and fine roots throughout; 55 percent prominent carbonate coats on rock fragments; 60 percent by volume nonflat subangular indurated 2-40-75 millimeter limestone, unspecified fragments; violent effervescence, by hcl, 1n; gradual wavy boundary. Lab sample # 91P2658. effervescence is continuous; continuous - phpvsfiid 1046768; continuous - phpvsfiid 1046768
    Bk4—107 to 145 centimeters (42.1 to 57.1 inches); pale brown (10YR 6/3), brown (10YR 5/3), moist; extremely gravelly sandy loam; weak fine granular structure; slightly hard, friable; 55 percent prominent carbonate coats on rock fragments; 70 percent by volume nonflat subangular indurated 2-40-75 millimeter limestone, unspecified fragments; violent effervescence, by hcl, 1n; gradual wavy boundary. Lab sample # 91P2659. effervescence is continuous; continuous - phpvsfiid 1046769; continuous - phpvsfiid 1046769
    C—145 to 178 centimeters (57.1 to 70.1 inches); pale brown (10YR 6/3), brown (10YR 5/3), moist; extremely gravelly sandy loam; single grain; soft, very friable; 15 percent faint carbonate coats on rock fragments; 75 percent by volume nonflat subangular indurated 2-40-75 millimeter limestone, unspecified fragments; violent effervescence, by hcl, 1n. Lab sample # 91P2660. effervescence is continuous; patchy - phpvsfiid 1046770; patchy - phpvsfiid 1046770