IDENTIFIERS

  • Current Taxon Name (Soil Name): Stillwell
  • OSD
  • Series Extent
  • User Site ID: S1991-TX043-011-copy
  • User Pedon ID: S1991-TX043-011-copy
  • Vegetation Plot ID: S1991-TX043-011-copy
  • Lab Information:
  • Certified Lab Pedon Description - yes
  • Lab Source ID - SSL
  • Lab Pedon # - 91P0465
  • NCSS Pedon Lab Data NASIS Record ID - 63508
  • Print Date: 11/12/2024

    • 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: 29.7613888
  • Std. Longitude: -103.1611099
  • Datum: WGS84
  • Location Description: from the junction of US 90 and US 385 at Marathon; 30.45 miles south on US 385; 20 feet east of road in range
  • Map Unit: PAC—Paisano very gravelly sandy loam, 1 to 8 percent slopes
  • Country: US—United States
  • State: Texas
  • County: TX043—Brewster
  • MLRA: 42—Southern Desertic Basins, Plains, and Mountains
  • MLRA Soil Survey Area: SW-MAF—Marfa, Texas
  • Non-MLRA Soil Survey Area: TX622—Brewster County, Texas (Main Part)
  • 7.5 Minute USGS Quad: 29103-G2—Sosa Peak, Texas

    • PEDON

  • Describers Name: Rex Cochran and Stan Albee
  • Current Taxonomic Class: Loamy-skeletal, carbonatic, hyperthermic Typic Haplocalcids
  • Current Taxon Kind: taxadjunct
  • Pedon Type: OSD pedon
  • Pedon Purpose: full pedon description
  • Pedon Record Orgin: Converted from SSL-CMS data
  • Pedon #: 11
  • Correlated Information:
  • Soil Name - Stillwell
  • PSC - 25 to 100 cm.
  • Classificaton Date - 1/31/2019
  • Soil Taxonomic Edition - tenth 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: alluvial fan
  • Slope Shape Down: linear
  • Runoff: medium
  • Drainage Class: well
  • Surface Fragments: 60.00 percent nonflat subangular indurated 2- to 75-millimeter limestone, unspecified, 5.00 percent 75- to 250-millimeter
  • 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

    AGLE

    FLCE

    LATR2

    OPLE

    YUTH

    Agave lechuguilla

    Flourensia cernua

    Larrea tridentata

    Opuntia leptocaulis

    Yucca thompsoniana

    lechuguilla

    American tarwort

    creosote bush

    Christmas cactus

    Thompson's yucca

    —

    —

    —

    —

    —

    —

    —

    —

    —

    —

    —

    —

    —

    —

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

    ochric epipedon

    calcic horizon

    0—23

    23—119

    —-

    —-
    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

    —

    —

    896

    —

    45

    267

    773

    —

    19.5

    —

    —

    —

    —

    —

    —

    —

    PRISM

    —

    —
    A1—0 to 5 centimeters (0.0 to 2.0 inches); brown (10YR 5/3), brown (10YR 4/3), moist; loam; weak medium granular structure; slightly hard, friable; 2.5 very fine and fine roots throughout; 5 percent by volume nonflat subangular indurated 2-40-75 millimeter limestone, unspecified fragments; strong effervescence, by hcl, 1n; abrupt smooth boundary. Lab sample # 91P2661
    A2—5 to 23 centimeters (2.0 to 9.1 inches); pale brown (10YR 6/3), brown (10YR 5/3), moist; loam; weak medium granular structure; slightly hard, friable; 2.5 very fine and fine roots throughout; 10 percent by volume nonflat subangular indurated 2-39-75 millimeter limestone, unspecified fragments; strong effervescence, by hcl, 1n; abrupt smooth boundary. Lab sample # 91P2662
    Bk1—23 to 74 centimeters (9.1 to 29.1 inches);, very pale brown (10YR 7/4), moist; very gravelly loam; weak medium granular structure; 0.5 very fine and fine roots throughout; 55 percent prominent , moist, carbonate coats on rock fragments; 1 percent by volume nonflat subangular indurated 250-425-600 millimeter limestone, unspecified fragments and 2 percent by volume nonflat subangular indurated 75-162-250 millimeter igneous, unspecified fragments and 10 percent by volume nonflat subangular indurated 75-162-250 millimeter limestone, unspecified fragments; strong effervescence, by hcl, 1n; clear wavy boundary. Lab sample # 91P2663. continuous - phpvsfiid 1046771; continuous - phpvsfiid 1046771
    Bk2—74 to 119 centimeters (29.1 to 46.9 inches);, very pale brown (10YR 7/4), moist; very gravelly coarse sandy loam; weak medium subangular blocky structure; slightly hard, very friable; 55 percent prominent , moist, carbonate coats on rock fragments; 1 percent by volume nonflat subangular indurated 250-425-600 millimeter limestone, unspecified fragments and 3 percent by volume nonflat subangular indurated 75-162-250 millimeter igneous, unspecified fragments and 10 percent by volume nonflat subangular indurated 75-162-250 millimeter limestone, unspecified fragments; strong effervescence, by hcl, 1n; gradual wavy boundary. Lab sample # 91P2664. continuous - phpvsfiid 1046772; continuous - phpvsfiid 1046772
    C—119 to 173 centimeters (46.9 to 68.1 inches);, very pale brown (10YR 7/4), moist; very gravelly loam; single grain; slightly hard, friable; 1 percent by volume nonflat subangular indurated 250-425-600 millimeter limestone, unspecified fragments and 3 percent by volume nonflat subangular indurated 75-162-250 millimeter igneous, unspecified fragments and 10 percent by volume nonflat subangular indurated 75-162-250 millimeter limestone, unspecified fragments; strong effervescence, by hcl, 1n. Lab sample # 91P2665