IDENTIFIERS

  • Current Taxon Name (Soil Name): Denison
  • OSD
  • Series Extent
  • User Site ID: S1955CA081001
  • User Pedon ID: S1955CA081001
  • Lab Information:
  • Certified Lab Pedon Description - no
  • Lab Source ID - SSL
  • Lab Pedon # - 40A3030
  • NCSS Pedon Lab Data NASIS Record ID - 38159
  • 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: 37.5047226
  • Std. Longitude: -122.4833298
  • Datum: WGS84
  • Location Description: 1/4 mile east of Princeton, 40 feet east of the sea cliff, 1/8 mile SW of junction of Highway 1 and Piose Rd. on east side of Piose Rd. See Sheet 6, Soil Survey Report of San Mateo Area, California, May 1961.
  • State: California
  • County: CA081—San Mateo
  • MLRA: 4—California Coastal Redwood Belt
  • Non-MLRA Soil Survey Area: CA637—San Mateo Area, California

    • PEDON

  • Describers Name: W. M. Johnson
  • Current Taxonomic Class: Fine, smectitic, isomesic Pachic Argiustolls
  • Current Taxon Kind: series
  • Pedon Purpose: full pedon description
  • Pedon Record Orgin: Converted from PDP 3.x
  • Pedon #: 1
  • Correlated Information:
  • Soil Name - Denison
  • PSC - 25 to 100 cm.
  • Classificaton Date - 1/27/2010
  • Moisture Class - ustic
  • Sampled As Information:
  • Soil Name - Denison
  • Classificaton Date - 2/23/1955
  • Dynamic Soil Properties:
  • Pedoderm Loose Cover Indicator - no
  • Hydric: no


    • SITE

  • Landform: alluvial fan
  • Slope Shape Down: linear
  • Runoff: low
  • Drainage Class: moderately well
  • Surface Fragments:
  • Benchmark Soil?: no

    • VEGETATION

    SITE OBSERVATION

  • Observation Date: 2/23/1955 (actual site observation date)
  • Surface Cover Properties:
  • Site Obs. Cover Kind 1 - crop cover
  • Site Obs. Cover Kind 2 - row crop
  • Pedoderm Loose Cover Indicator - no
  • Drained? - no
  • Bedded Soil? - no
  • Forest Plantation? - no
    • 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

    1

    —

    —

    6

    —

    270

    635

    —

    —

    —

    15.6

    8.9

    —

    —

    —

    —

    —

    —

    —

    —
    AP—0 to 13 centimeters (0.0 to 5.1 inches); black (10YR 2/1), black (10YR 2/1), moist; clay loam; weak fine granular structure; very hard, friable, moderately sticky, moderately plastic; 21.0 roots; 21 percent worm casts; fragments; moderately acid, pH 6.0, hellige-truog; abrupt smooth boundary. Lab sample # 40A23761; moist when described;
    A12—13 to 25 centimeters (5.1 to 9.8 inches); black (10YR 2/1), black (10YR 2/1), moist; clay loam; weak coarse and very coarse prismatic parts to weak medium granular structure; friable, moderately sticky, moderately plastic; 21.0 roots; 21 percent worm casts; fragments; slightly acid, pH 6.5, hellige-truog; clear wavy boundary. Lab sample # 40A23762; moist when described;
    B21—25 to 58 centimeters (9.8 to 22.8 inches); black (10YR 2/1), black (10YR 2/1), moist; clay; strong very coarse prismatic parts to weak coarse subangular blocky structure; extremely hard, firm, very sticky, very plastic; 21.0 roots; 30 percent clay films; 1 percent weakly coherent cemented nonmagnetic shot; fragments; slightly acid, pH 6.3, hellige-truog; clear wavy boundary. Lab sample # 40A23763; moist when described;. Contains a very few hard shot concretions 1/8 inch in diameter.; continuous - phpvsfiid 196489; continuous - phpvsfiid 196489
    B22—58 to 86 centimeters (22.8 to 33.9 inches); black (10YR 2/1), black (10YR 2/1), moist; clay; moderate very coarse prismatic parts to weak coarse subangular blocky structure; extremely hard, very firm, very sticky, very plastic; 0.5 roots; 75 percent slickensides (pedogenic); black (10YR 2/1) nonmagnetic shot; fragments; slightly acid, pH 6.3, hellige-truog; clear irregular boundary. Lab sample # 40A23764; moist when described;. Contains an occasional dark black shot concretions about 1/8 in diameter.
    B3—86 to 114 centimeters (33.9 to 44.9 inches); dark gray (2.5Y 4/1) and light yellowish brown (2.5Y 6/3), very dark gray (2.5Y 3/1) and olive brown (2.5Y 4/3), moist; clay; weak coarse prismatic parts to moderate medium subangular blocky structure; extremely hard, firm, very sticky, very plastic; 0.1 fine roots; clay films and 30 percent slickensides (pedogenic); fragments; neutral, pH 7.0, hellige-truog; clear wavy boundary. Lab sample # 40A23765; moist when described;. Tongues of B2 horizon penetrate this horizon.; continuous - phpvsfiid 184080; continuous - phpvsfiid 184080
    C1—114 to 132 centimeters (44.9 to 52.0 inches); olive gray (5Y 5/2), olive gray (5Y 5/2), moist; clay loam; 3 percent white (10YR 8/1) fine and medium and 3 percent black (10YR 2/1) fine and medium and 3 percent yellowish brown (10YR 5/6) fine and medium mottles; weak coarse prismatic parts to weak very fine and fine subangular blocky structure; firm, moderately sticky, very plastic; 0.1 fine roots; clay films and 30 percent slickensides (pedogenic); fragments; slightly alkaline, pH 7.4, hellige-truog; clear wavy boundary. Lab sample # 40A23766; moist when described;. continuous - phpvsfiid 184046; continuous - phpvsfiid 184046
    C2—132 to 155 centimeters (52.0 to 61.0 inches); pale olive (5Y 6/3), olive gray (5Y 5/2), moist; silty clay loam; 1 percent black (10YR 2/1) medium and 3 percent yellowish brown (10YR 5/6) fine and 3 percent white (10YR 8/1) fine mottles; moderate coarse prismatic parts to moderate medium and coarse subangular blocky structure; firm, moderately sticky, very plastic; 21.0 roots; clay films on vertical faces of peds and 30 percent slickensides (pedogenic); fragments; slightly alkaline, pH 7.8, hellige-truog; abrupt smooth boundary. Lab sample # 40A23767; moist when described;. Moderately developed clay skins on vertical surfaces; numerous root holes filled and lined with dark-colored clay.
    Dg1—155 to 178 centimeters (61.0 to 70.1 inches); light olive brown (2.5Y 5/3), light olive brown (2.5Y 5/3), moist; loam; 1 percent black (10YR 2/1) medium and 3 percent yellowish brown (10YR 5/6) fine and 3 percent white (10YR 8/1) fine mottles; massive; friable, moderately sticky, moderately plastic; 21.0 tubular pores; prominent dark olive brown (2.5Y 3/3) clay films; fragments; neutral, pH 7.0, hellige-truog; abrupt smooth boundary. Lab sample # 40A23768; moist when described;. Massive, with common, widely spaced vertical cracks. The cracks have prominent dark olive-brown clay skins. Numerous tubular pores lined with dark-colored clay.
    Dg2—178 to 196 centimeters (70.1 to 77.2 inches); light yellowish brown (2.5Y 6/3), light olive brown (2.5Y 5/3), moist; clay loam; 1 percent black (10YR 2/1) medium and 3 percent white (10YR 8/1) fine and 21 percent strong brown (7.5YR 5/6) fine mottles; massive; friable, moderately sticky, very plastic; 21.0 tubular pores; black (10YR 2/1) clay films; fragments; neutral, pH 7.0, hellige-truog. Lab sample # 40A23769; moist when described;. Massive, with vertical cracks spaced 6-15 inches apart. Numerous tubular pores from 1/8 to 3/8 inch in diameter with dark-colored clay linings.