IDENTIFIERS

  • Current Taxon Name (Soil Name): Ector
  • OSD
  • Series Extent
  • User Site ID: S1992TX043013
  • User Pedon ID: 92TX043013
  • Vegetation Plot ID: S1992TX043013
  • Lab Information:
  • Certified Lab Pedon Description - yes
  • Lab Source ID - KSSL
  • Lab Pedon # - 93P0293
  • NCSS Pedon Lab Data NASIS Record ID - 65636
  • Print Date: 4/23/2025

    • 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: 30.1983337
  • Std. Longitude: -102.8183365
  • Datum: WGS84
  • Location Description: 25 miles E of Marathon on US 90; 0.4 miles NW to junction; 1.1 miles N; 40 feet W of road in range.
  • Map Unit: ERG—Ector-Rock outcrop complex, 10 to 60 percent slopes
  • Country: US—United States
  • State: Texas
  • County: TX043—Brewster
  • MLRA: 81A—Edwards Plateau, Western Part
  • Regional Office: SC—South Central
  • Non-MLRA Soil Survey Area: TX622—Brewster County, Texas (Main Part)
  • 7.5 Minute USGS Quad: 30102-B7—Tesnus NE, Texas

    • PEDON

  • Describers Name: Rex Cochran
  • Current Taxonomic Class: Loamy-skeletal, carbonatic, thermic Lithic Calciustolls
  • Current Taxon Kind: series
  • Pedon Type: TUD pedon
  • Pedon Purpose: laboratory sampling site
  • Pedon Record Orgin: Converted from PDP 3.x
  • Pedon #: 13
  • Correlated Information:
  • Soil Name - Ector
  • PSC - 0 to 23 cm.
  • Classificaton Date - 11/20/2014
  • Soil Taxonomic Edition - twelfth edition
  • Moisture Class - aridic (torric)
  • Moisture Subclass - ustic
  • Sampled As Information:
  • Soil Name - Ector-copy
  • Classificaton Date - 7/7/1992
  • 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

  • Landscape: mountains
  • Landform: mountainside
  • Geomorphic Component Hills: side slope
  • Hill Slope Profile: backslope
  • Slope Position: upper third
  • Slope Shape Across: convex
  • Slope Shape Down: convex
  • Runoff: very high
  • Drainage Class: well
  • Surface Fragments: 50.00 percent 50.00 percent
  • Benchmark Soil?: no

    • VEGETATION

    SITE OBSERVATION

  • Observation Date: 7/7/1992 (actual site observation date)
  • Air Photo ID: 24
  • Surface Cover Properties:
  • Site Obs. Cover Kind 1 - grass/herbaceous cover
  • Site Obs. Cover Kind 2 - rangeland, shrubby
  • 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

    SIDE

    Sibara deserti

    desert winged rockcress

    —

    —

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

    bedrock, lithic

    indurated

    36 - 51

    - 15 -

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

    mollic epipedon

    calcic horizon

    lithic contact

    0—23

    10—23

    36—51

    —23—

    —13—

    —15—
    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

    29

    91

    30.5

    1391

    —

    90

    330

    —

    —

    —

    —

    —

    —

    —

    —

    —

    —

    —

    —

    —
    A—0 to 10 centimeters (0.0 to 3.9 inches); very dark grayish brown (10YR 3/2), very dark brown (10YR 2/2), moist; very gravelly clay loam; weak medium granular structure; slightly hard, friable, moderately sticky, moderately plastic; 3.0 very fine and fine roots and 0.5 medium roots; 50 percent by volume nonflat subangular very strongly coherent cemented 2-?-75 millimeter limestone, unspecified fragments; violent effervescence, by hcl, 1n; moderately alkaline, pH 8.0; clear smooth boundary. Lab sample # 93P02337; observed in pit, small
    Ak—10 to 23 centimeters (3.9 to 9.1 inches); very dark grayish brown (10YR 3/2), very dark brown (10YR 2/2), moist; extremely cobbly clay loam; weak medium granular structure; slightly hard, friable, moderately sticky, moderately plastic; 3.0 very fine and fine roots; distinct carbonate coats on bottom of rock fragments; 30 percent by volume nonflat subangular very strongly coherent cemented 75-?-250 millimeter limestone, unspecified fragments and 40 percent by volume nonflat subangular very strongly coherent cemented 2-?-75 millimeter limestone, unspecified fragments; violent effervescence, by hcl, 1n; moderately alkaline, pH 8.0; abrupt irregular boundary. Lab sample # 93P02338; observed in pit, small. continuous - phpvsfiid 450657; continuous - phpvsfiid 450657
    Rk/Ak—23 to 36 centimeters (9.1 to 14.2 inches); bedrock; very high excavation difficulty; carbonate coats on rock fragments; fragments; violent effervescence.; observed in pit, small
    R—36 to 51 centimeters (14.2 to 20.1 inches); bedrock; indurated; extremely high excavation difficulty; fragments.; observed in pit, small