IDENTIFIERS

  • Current Taxon Name (Soil Name): Lawther
  • OSD
  • Series Extent
  • User Site ID: S1956MT103006
  • User Pedon ID: S1956MT103006
  • Vegetation Plot ID: S1956MT103006
  • Lab Information:
  • Certified Lab Pedon Description - no
  • Lab Source ID - SSL
  • Lab Pedon # - 40A3539
  • NCSS Pedon Lab Data NASIS Record ID - 39204
  • Print Date: 2/17/2025

    • 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: 46.0396576
  • Std. Longitude: -107.2162628
  • Datum: WGS84
  • Township: 3N
  • Range: 36E
  • Section: 2
  • PLSS Details: about 1400 feet south and 500 feet east of north quarter corner
  • State: Montana
  • County: MT103—Treasure
  • MLRA: 58A—Northern Rolling High Plains, Northern Part
  • Non-MLRA Soil Survey Area: MT103—Treasure County, Montana

    • PEDON

  • Describers Name: Dave R. Cawlfield
  • Current Taxonomic Class: Fine, smectitic, frigid Vertic Haploborolls
  • Current Taxon Kind: series
  • Pedon Purpose: full pedon description
  • Pedon Record Orgin: Converted from PDP 3.x
  • Pedon #: 6
  • Correlated Information:
  • Soil Name - Lawther
  • Classificaton Date - 7/23/2007
  • Sampled As Information:
  • Soil Name - Promise
  • Classificaton Date - 9/29/1956
  • Dynamic Soil Properties:
  • Erosion Class - 1
  • Pedoderm Loose Cover Indicator - no
  • Hydric: no


    • SITE

  • Drainage Class: well
  • Surface Fragments:
  • Benchmark Soil?: no

    • VEGETATION

    SITE OBSERVATION

  • Observation Date: 9/29/1956 (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

    NAVI4

    PASM

    POSE

    Nassella viridula

    Pascopyrum smithii

    Poa secunda

    green needlegrass

    western wheatgrass

    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

    6

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    991

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    45

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    A1—0 to 10 centimeters (0.0 to 3.9 inches); dark grayish brown (2.5Y 4/2), grayish brown (2.5Y 5/2), dry; clay; weak medium platy parts to strong very fine and fine granular structure; hard, firm, very sticky, very plastic; 21.0 roots; fragments; slightly alkaline, pH 7.6, phenol red; abrupt smooth boundary. Lab sample # 40A27308
    B21—10 to 23 centimeters (3.9 to 9.1 inches); very dark grayish brown (10YR 3/2), dark grayish brown (10YR 4/2), dry; clay; weak very coarse prismatic parts to moderate fine angular blocky structure; extremely hard, firm, very sticky, very plastic; 21.0 roots; 0.5 very fine pores; 30 percent clay films; fragments; slight effervescence; slightly alkaline, pH 7.6, phenol red; gradual boundary. Lab sample # 40A27309. continuous - phpvsfiid 197072; continuous - phpvsfiid 197072
    B22—23 to 38 centimeters (9.1 to 15.0 inches); dark grayish brown (2.5Y 4/2), grayish brown (2.5Y 5/2), dry; clay; 1 percent white (10YR 8/1) fine mottles; weak very coarse prismatic, and moderate medium angular blocky structure; extremely hard, firm, very sticky, very plastic; 21.0 roots; 0.5 very fine pores; fragments; strong effervescence; slightly alkaline, pH 7.8, phenol red; gradual irregular boundary. Lab sample # 40A27310
    B23—38 to 61 centimeters (15.0 to 24.0 inches); olive gray (5Y 4/2), olive gray (5Y 5/2), dry; clay; weak very coarse prismatic parts to moderate medium angular blocky structure; extremely hard, very firm, very sticky, very plastic; 21.0 roots; 0.5 very fine pores; fragments; strong effervescence; moderately alkaline, pH 8.4, thymol-blue; diffuse boundary. Lab sample # 40A27311
    C1cs—61 to 79 centimeters (24.0 to 31.1 inches); olive (5Y 4/3), olive gray (5Y 5/2), dry; clay; weak coarse angular blocky structure; extremely hard, very firm, very sticky, very plastic; 0.5 roots; 1 percent coarse white (10YR 8/1) gypsum crystals, unspecified; fragments; strong effervescence; moderately alkaline, pH 8.4, unspecified; gradual boundary. Lab sample # 40A27312
    C2cs—79 to 112 centimeters (31.1 to 44.1 inches); dark olive gray (5Y 3/2), pale olive (5Y 6/3), dry; clay; massive; extremely hard, friable, moderately sticky, moderately plastic; 0.1 roots; prominent ; 3 percent medium noncoherent cemented gypsum masses; fragments; strong effervescence; strongly alkaline, pH 8.6, thymol-blue; diffuse boundary. Lab sample # 40A27313. moderate medium-size prominent white splotches of gypsum and lime.
    C3cs—112 to 130 centimeters (44.1 to 51.2 inches); olive (5Y 5/3), pale olive (5Y 6/3), dry; clay; massive; hard, friable, moderately sticky, moderately plastic; prominent ; 3 percent medium noncoherent cemented gypsum masses; fragments; strong effervescence; moderately alkaline, pH 8.4, thymol-blue. Lab sample # 40A27314. moderate medium prominent white splotches of gypsum and lime.