IDENTIFIERS

  • Current Taxon Name (Soil Name): Rockpens
  • OSD
  • Series Extent
  • User Site ID: S1995-TX043-021-copy
  • User Pedon ID: S1995-TX043-021-copy
  • Vegetation Plot ID: S1995-TX043-021-copy
  • Lab Information:
  • Certified Lab Pedon Description - yes
  • Lab Source ID - SSL
  • Lab Pedon # - 98P0429
  • NCSS Pedon Lab Data NASIS Record ID - 10699
  • Print Date: 11/21/2024

    • 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: 29.7849998
  • Std. Longitude: -103.7316666
  • Datum: WGS84
  • Location Description: Brewster County, Texas; from the junction of US Highway 90 and Texas Highway 118 in Alpine, 41.1 miles south on Texas Highway 118, 4.25 miles west on ranch road, 0.8 mile south, 3.5 miles west, 0.7 miles south, 100 feet west of road in rangeland. West; NAD 1927; Straddlebug Mountain USGS 7.5 minute quadrangle.
  • 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-G6—Straddlebug Mountain, Texas

    • PEDON

  • Describers Name: Lynn Loomis, Jerry Rives, and Alan Terrell
  • Current Taxonomic Class: Loamy-skeletal, mixed, superactive, thermic Sodic Ustic Haplocambids
  • Current Taxon Kind: series
  • Pedon Type: OSD pedon
  • Pedon Purpose: full pedon description
  • Pedon Record Orgin: Converted from PDP 3.x
  • Pedon #: 21
  • Correlated Information:
  • Soil Name - Rockpens
  • PSC - 25 to 100 cm.
  • Classificaton Date - 1/29/2017
  • Soil Taxonomic Edition - twelfth edition
  • Moisture Class - aridic (torric)
  • Moisture Subclass - ustic
  • Sampled As Information:
  • Soil Name - Rockpens
  • Taxonomic Class - Loamy-skeletal, mixed, superactive, thermic Sodic
  • Taxon Kind - series
  • Classificaton Date - 1/1/1995
  • Moisture Class - aridic (torric)
  • Moisture SUBClass - ustic
  • Dynamic Soil Properties:
  • Pedoderm Loose Cover Indicator - no
  • Hydric: no
  • Certification Status: certified
  • QC Status: level 1


    • SITE

  • Landscape: piedmont
  • Landform: strath terrace on valley
  • Drainage Class: well
  • Bedrock: moderately coherent tuff, unspecified at 175cm
  • Geology: Pruett Formaiton formation.
  • Surface Fragments:
  • Benchmark Soil?: no

    • VEGETATION

  • Ecological Sites. (Click Ecological Site ID For Link to EDIT.)
    Ecological Site ID Ecological Site Name Correlation Data Classifier
    R042AC244TX Gravelly, Desert Grassland Jun 29 2017 Lynn Loomis

    • SITE OBSERVATION

  • Observation Date: 4/10/1995 (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

    ATCA2

    BOBA3

    BOCU

    BOER4

    BOGR2

    DICA8

    KRER

    LATR2

    MUPU2

    SELE6

    Atriplex canescens

    Bothriochloa barbinodis

    Bouteloua curtipendula

    Bouteloua eriopoda

    Bouteloua gracilis

    Digitaria californica

    Krameria erecta

    Larrea tridentata

    Muhlenbergia pungens

    Setaria leucopila

    fourwing saltbush

    cane bluestem

    sideoats grama

    black grama

    blue grama

    Arizona cottontop

    littleleaf ratany

    creosote bush

    sandhill muhly

    streambed bristlegrass

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

    bedrock, paralithic

    moderately coherent

    175 - 216

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

    ochric epipedon

    cambic horizon

    paralithic contact

    paralithic materials

    0—8

    8—69

    175—175

    175—246

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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

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    305

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    A—0 to 8 centimeters (0.0 to 3.1 inches); brown (7.5YR 5/3), brown (7.5YR 4/3), moist; sandy loam; moderate medium and coarse subangular blocky parts to moderate fine and medium subangular blocky structure; slightly hard, very friable, slightly sticky, slightly plastic; 3.0 very fine and fine roots; 0.5 very fine tubular pores; 5 percent by volume rounded indurated 2-?-75 millimeter ignimbrite fragments; strong effervescence, by hcl, 1n; slightly alkaline, pH 7.6, hellige-truog; clear smooth boundary. Lab sample # 98P02482; observed in trench
    Bn1—8 to 36 centimeters (3.1 to 14.2 inches); brown (7.5YR 5/3), brown (7.5YR 4/3), moist; gravelly loam; moderate medium and coarse subangular blocky parts to moderate fine and medium subangular blocky structure; slightly hard, friable, slightly sticky, slightly plastic; 3.0 very fine roots and medium and coarse roots and fine roots; 0.5 fine tubular pores; 3 percent white (10YR 8/1), dry, carbonate coats on rock fragments; 2 percent very fine threadlike white (10YR 8/1), dry, carbonate masses on faces of peds; 15 percent by volume rounded indurated 2-?-75 millimeter ignimbrite fragments; violent effervescence, by hcl, 1n; moderately alkaline, pH 8.2, hellige-truog; clear smooth boundary. Lab sample # 98P02483; observed in trench. patchy - phpvsfiid 1681527; patchy - phpvsfiid 1681527
    Bn2—36 to 69 centimeters (14.2 to 27.2 inches); brown (7.5YR 5/3), brown (7.5YR 4/3), moist; gravelly loam; weak medium and coarse subangular blocky parts to weak fine and medium subangular blocky structure; slightly hard, friable, slightly sticky, slightly plastic; 3.0 very fine and fine roots; 0.5 fine tubular and 3.0 fine interstitial pores; 3 percent white (10YR 8/1), dry, carbonate coats on rock fragments; 2 percent medium irregular noncoherent cemented white (10YR 8/1), dry, carbonate masses throughout and 2 percent very fine threadlike noncoherent cemented white (10YR 8/1), dry, carbonate masses on faces of peds; 5 percent by volume subrounded indurated 75-?-250 millimeter ignimbrite fragments and 20 percent by volume rounded indurated 2-?-75 millimeter ignimbrite fragments; violent effervescence, by hcl, 1n; moderately alkaline, pH 8.2, hellige-truog; clear smooth boundary. Lab sample # 98P02484; observed in trench. discontinuous - phpvsfiid 1681528; discontinuous - phpvsfiid 1681528
    Cn1—69 to 91 centimeters (27.2 to 35.8 inches); reddish brown (5YR 5/3), reddish brown (5YR 4/3), moist; extremely gravelly loamy sand; single grain; soft, very friable, nonsticky, nonplastic; 3.0 very fine and fine roots; 21.0 fine interstitial pores; 1 percent white (10YR 8/1), dry, carbonate coats on rock fragments; 10 percent by volume subrounded indurated 75-?-250 millimeter ignimbrite fragments and 60 percent by volume rounded indurated 2-?-75 millimeter ignimbrite fragments; strong effervescence, by hcl, 1n; moderately alkaline, pH 8.2, hellige-truog; gradual wavy boundary. Lab sample # 98P02485; observed in trench. discontinuous - phpvsfiid 1681529; discontinuous - phpvsfiid 1681529
    Cn2—91 to 132 centimeters (35.8 to 52.0 inches); reddish brown (5YR 5/3), reddish brown (5YR 4/3), moist; extremely gravelly coarse sandy loam; single grain; loose, very friable, nonsticky, nonplastic; 0.5 very fine and fine roots; 21.0 fine interstitial pores; 1 percent white (10YR 8/1), dry, carbonate coats on rock fragments; 10 percent by volume subrounded indurated 75-?-250 millimeter ignimbrite fragments and 75 percent by volume rounded indurated 2-?-75 millimeter ignimbrite fragments; strong effervescence, by hcl, 1n; slightly alkaline, pH 7.6, hellige-truog; abrupt wavy boundary. Lab sample # 98P02486; observed in trench. discontinuous - phpvsfiid 1681530; discontinuous - phpvsfiid 1681530
    Cn3—132 to 175 centimeters (52.0 to 68.9 inches); reddish brown (5YR 5/3), reddish brown (5YR 4/3), moist; extremely gravelly coarse sandy loam; single grain; loose, very friable, nonsticky, nonplastic; 0.5 very fine and fine roots; 21.0 fine interstitial pores; 1 percent white (10YR 8/1), dry, carbonate coats on rock fragments; 5 percent by volume subrounded indurated 75-?-250 millimeter ignimbrite fragments and 10 percent by volume subrounded indurated 250-?-600 millimeter ignimbrite fragments and 50 percent by volume rounded indurated 2-?-75 millimeter ignimbrite fragments; strong effervescence, by hcl, 1n; slightly alkaline, pH 7.6, hellige-truog; abrupt smooth boundary. Lab sample # 98P02487; observed in trench. discontinuous - phpvsfiid 1681531; discontinuous - phpvsfiid 1681531
    2Crk—175 to 216 centimeters (68.9 to 85.0 inches); gray (10YR 6/1) bedrock; massive; 0.5 very fine and fine roots in cracks; 5 percent medium irregular noncoherent cemented white (10YR 8/1), dry, carbonate masses in cracks; fragments; violent effervescence, by hcl, 1n. Lab sample # 98P02488; observed in trench. Fracture interval is greater than 10 cm;