Scientific Investigations Report 2005–5288

U.S. GEOLOGICAL SURVEY
Scientific Investigations Report 2005–5288

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Appendix B. Lithologic description of soil penetrated by nine soil-chloride test holes, Carson Valley, Nevada and California.

[Test hole locations are shown in figure 2. Description in approximate order of sediment amount, by volume. Color codes from standard rock-color chart]

Test hole No. Depth below land surface (feet) Lithologic description
CL-1 0–2.7 Sand (fine), silt, and gravel (fine); pale brown (5YR5/2).
  2.7–6.0 Sand (fine), silt, and gravel (coarse, up to 1-inch diameter); moderate yellowish brown (10YR5/4).
  6.0–8.3 Sand (coarse), silt, and gravel (fine to medium); moderate yellowish brown (10YR5/4).
  8.3–12.5 Rounded gravel (coarse), sand (fine to coarse), and angular gravel (decomposed granite); grayish orange (10YR7/4).
  12.5–14.3 Sand (fine to coarse), angular gravel (decomposed granite), and rounded gravel (coarse, 1- to 3-inch diameter); grayish orange (10YR7/4).
  14.3–18.0 Angular gravel (decomposed granite), sand (coarse), and rounded gravel (medium); grayish orange (10YR7/4).
  18.0–22.7 Sand (fine) and silt; grayish orange (10YR7/4).
CL-2 0–4.7 Sand (fine to coarse) and silt with occasional fine gravel; pale yellowish brown (10YR6/2).
  4.7–8.0 No sample retained.
  8.0–14.6 Sand (fine to medium) and silt; grayish orange (10YR7/4).
  14.6–18.0 Sand (fine) and silt; grayish orange (10YR7/4).
  18.0–22.1 No sample retained.
  22.1–30.8 Sand (fine to coarse) and silt with occasional fine gravel; pale yellowish brown (10YR7/4).
CL-3 0–12.1 Semiconsolidated silt, clay, and rounded gravel (fine to medium); yellowish gray (5Y7/2).
  12.1–18.3 Very hard, semiconsolidated sand (fine) and silt; yellowish gray (5Y7/2).
  18.3–20.5 Semiconsolidated sand (fine) and silt with occasional fine gravel; yellowish gray (5Y7/2).
  20.5–25.3 Semiconsolidated sand (fine), silt, and clay with occasional fine gravel; yellowish gray (5Y7/2).
  25.3–28.3 Semiconsolidated sand (fine), silt, and clay with occasional fine gravel; pale yellowish brown (10YR6/2).
CL-4 0–3.3 Silt, rounded gravel (fine to medium), and sand (fine to coarse); pale yellowish brown (10YR6/2).
  3.3–6.5 Semiconsolidated silt and sand (fine to medium), caliche near 56 inches (4.7 feet); yellowish gray (5Y8/1).
  6.5–9.6 Semiconsolidated sand (coarse), gravel (fine to coarse), and silt; grayish orange (10YR7/4).
  9.6–25.0 Semiconsolidated clay and silt (stiff and plastic), fractures coated with yellowish oxide; pale yellowish brown (10YR6/2).
CL-5 0–1.5 Silt, sand (fine to coarse), and rounded gravel (fine to medium); pale yellowish brown (10YR6/2) to grayish orange (10YR7/4).
  1.5–2.3 Semiconsolidated silt and clay; grayish orange (10YR7/4).
  2.3–4.7 Semiconsolidated silt, clay, and gravel (fine to medium); pale yellowish brown (10YR6/2), grayish orange (10YR7/4), and very pale orange (10YR8/2).
  4.7–12.5 Weathered or altered volcanic bedrock?, cuttings are crumbly with abundant phenocrysts; very pale orange (10YR8/2) to grayish orange (10YR7/4).
CL-6 0–2.5 Silt, clay, sand (medium to coarse), and occasional fine gravel; pale reddish brown (10R4/2) to pale red (10R6/2).
  2.5–4.7 Semiconsolidated silt, clay, sand, and rounded gravel (coarse); grayish orange (10YR7/4).
  4.7–27.3 Semiconsolidated, rounded gravel (fine to coarse, up to 3-inch diameter, with caliche coatings near 12.2 feet), silt, clay, and sand; dark yellowish orange (10YR6/6) to grayish orange (10YR7/4).
  27.3–29.8 Semiconsolidated silt, clay, sand (fine to coarse), and rounded gravel (fine); pale yellowish brown (10YR6/2).
CL-7 0–2.3 Silt, sand (fine to coarse), and rounded gravel (fine to medium); pale yellowish brown (10YR6/2).
  2.3–18.3 Semiconsolidated, rounded gravel (fine to coarse), silt, and sand (fine to coarse); pale yellowish brown (10YR6/2).
  18.3–25.2 Semiconsolidated sand (fine to coarse), rounded gravel (coarse), and silt; moderate yellowish brown (10YR5/4).
  25.2–28.7 Semiconsolidated clay, silt, sand (fine to coarse), and rounded gravel (fine); dark yellowish brown (10YR4/2).
  28.7–30.0 Semiconsolidated clay, silt, sand (coarse), and gravel (fine to medium); moderate yellowish brown (10YR5/4).
CL-8 0–3.5 Silt, clay, and sand (fine); dark yellowish brown (10YR4/2).
  3.5–5.3 Semiconsolidated silt, clay, and sand (fine); grayish orange (10YR7/4).
  5.3–7.7 Semiconsolidated silt, sand (fine), and clay; moderate yellowish brown (10YR5/4) to grayish orange (10YR7/4).
  7.7–11.8 Semiconsolidated silt, sand (fine), and clay; dark yellowish brown (10YR4/2) to pale yellowish brown (10YR6/2).
  11.8–17.8 Semiconsolidated silt, clay, and sand (fine); pale yellowish brown (10YR6/2).
  17.8–24.8 Semiconsolidated silt, clay, sand (fine), and rounded gravel (fine to medium); grayish orange (10YR7/4).
  24.8–30.4 Semiconsolidated silt, clay, and sand (fine); pale yellowish brown (10YR6/2).
CL-9 0–3.3 Silt, sand (fine) and rounded gravel (medium); pale yellowish brown (10YR6/2).
  3.3–14.3 Sand (coarse), silt, angular gravel (decomposed granite), and rounded gravel (coarse, up to 2-inch diameter); moderate yellowish brown (10YR5/4) to pale yellowish brown (10YR6/2).
  14.3–19.5 Sand (fine to coarse), and silt, with rounded gravel below 226 inches (18.8 feet); pale yellowish brown (10YR6/2).
  19.5–22.0 No sample retained.
  22.0–25.3 Semiconsolidated sand (fine) and silt; pale yellowish brown (10YR6/2).
  25.3–30.2 Rounded gravel (fine to coarse, up to 3-inch diameter), sand (fine to coarse), and silt; pale yellowish brown (10YR6/2).

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