IDENTIFIERS

  • Current Taxon Name (Soil Name): Geohrock
  • OSD
  • Series Extent
  • User Site ID: S1991MT049004
  • User Pedon ID: 91MT049004
  • Vegetation Plot ID: S1991MT049004
  • Lab Information:
  • Certified Lab Pedon Description - no
  • Lab Source ID - SSL
  • Lab Pedon # - 92P0502
  • NCSS Pedon Lab Data NASIS Record ID - 64741
  • Print Date: 11/23/2024

    • 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: 46.7299004
  • Std. Longitude: -112.1442184
  • Datum: WGS84
  • Township: 11N
  • Range: 4W
  • Section: 8
  • PLSS Details: 1200 feet S and 1000 feet E of NW corner
  • Location Description: Lincolnroad West
  • State: Montana
  • County: MT049—Lewis and Clark

    • PEDON

  • Describers Name: LCB, PM, AS
  • Pedon Type: OSD pedon
  • Pedon Record Orgin: Converted from PDP 3.x
  • Pedon #: 4
  • Sampled As Information:
  • Soil Name - Geohrock
  • Taxonomic Class - Loamy-skeletal, mixed Borollic Haplargids
  • PSC - 10 to 60 cm.
  • Classificaton Date - 5/26/1977
  • Moisture Class - aridic (torric)
  • Dynamic Soil Properties:
  • Erosion Class - 1
  • Pedoderm Loose Cover Indicator - no
  • Hydric: no


    • SITE

  • Landform: terrace
  • Slope Position: on a slope
  • Drainage Class: well
  • Surface Fragments: 0.00 percent
  • Benchmark Soil?: no

    • VEGETATION

    SITE OBSERVATION

  • Observation Date: 5/26/1977 (actual site observation date)
  • Air Photo ID: 8P-15
  • Surface Cover Properties:
  • 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

    ARFR4

    BOGR2

    GUSA2

    POSE

    Artemisia frigida

    Bouteloua gracilis

    Gutierrezia sarothrae

    Poa secunda

    prairie sagewort

    blue grama

    broom snakeweed

    Sandberg bluegrass

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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

    2

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    1219

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    90

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    A—0 to 10 centimeters (0.0 to 3.9 inches); pinkish gray (7.5YR 7/2), brown (7.5YR 4/2), moist; channery loam; 24 percent clay; moderate very fine platy parts to moderate very fine columnar structure; slightly hard, very friable, moderately sticky, slightly plastic; 21.0 very fine roots; fragments; very slight effervescence; slightly alkaline, pH 7.4, hellige-truog; clear smooth boundary. Lab sample # 92P02920. approximately 20% fine channery or angular gravelly in horizon
    Bt—10 to 25 centimeters (3.9 to 9.8 inches); dark yellowish brown (10YR 4/4) and gray (10YR 6/1) and light brownish gray (10YR 6/2) and light brownish gray (2.5Y 6/2), reddish brown (5YR 4/3), moist; gravelly clay loam; 34 percent clay; moderate medium prismatic parts to moderate medium subangular blocky structure; hard, firm, moderately sticky, moderately plastic; 3.0 very fine roots; 21.0 very fine interstitial and tubular pores; 75 percent distinct clay films on faces of peds and in pores; fragments; very slight effervescence; slightly alkaline, pH 7.4, hellige-truog; clear smooth boundary. Lab sample # 92P02921. approximately 30% coarse fragments: (5YR 4/4) matrix moist, flat, semi-rounded, etc. (35% in lower part of the horizon)
    Btk—25 to 46 centimeters (9.8 to 18.1 inches); pinkish gray (7.5YR 6/2), reddish brown (5YR 4/3) and reddish brown (5YR 5/3) crushed, moist; very channery loam; 23 percent clay; weak medium subangular blocky structure; slightly hard, friable, moderately sticky, slightly plastic; 3.0 very fine roots; 21.0 very fine interstitial and tubular pores; 10 percent prominent clay films; 3 percent medium lime masses; fragments; strong effervescence; moderately alkaline, pH 8.1, hellige-truog; gradual wavy boundary. Lab sample # 92P02922. major color is (7.5YR 5/4); 40% channers; rocks in profile are mostly hard, but some are decomposed and soft
    Bk1—46 to 61 centimeters (18.1 to 24.0 inches); light brown (7.5YR 6/4), brown (7.5YR 5/4), moist; very gravelly loam; massive; slightly hard, friable, moderately sticky, slightly plastic; 3.0 very fine roots; 21.0 very fine interstitial and tubular pores; lime masses; fragments; violent effervescence; strongly alkaline, pH 8.6, hellige-truog; gradual smooth boundary. Lab sample # 92P02923. 50+% rocks (retained #4); 10% retained #10; 40% passing #10
    Bk2—61 to 102 centimeters (24.0 to 40.2 inches); pale brown (10YR 6/3), brown (7.5YR 5/3), moist; very gravelly loam; 24 percent clay; massive; slightly hard, friable, moderately sticky, slightly plastic; 3.0 very fine roots; fragments; violent effervescence; moderately alkaline, pH 8.4, hellige-truog. Lab sample # 92P02924
    C1—102 to 114 centimeters (40.2 to 44.9 inches); pinkish gray (7.5YR 6/2), brown (7.5YR 5/2), moist; extremely gravelly loam; 22 percent clay; massive; slightly hard, friable, moderately sticky, slightly plastic; 0.5 very fine roots; fragments; slight effervescence; slightly alkaline, pH 7.8, hellige-truog. Lab sample # 92P02925. 70% rocks retained #4; 10% retained #10; 20% passing #10
    C2—114 to 152 centimeters (44.9 to 59.8 inches); pinkish gray (7.5YR 6/2), brown (7.5YR 5/3), moist; very gravelly loam; 22 percent clay; massive; slightly hard, friable, moderately sticky, slightly plastic; fragments; slight effervescence; moderately alkaline, pH 8.0, hellige-truog. Lab sample # 92P02925. 50% retained #4, 10% retained #10; 40% passing #10