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Open-File Report 2004–1434
By Beth M. Wrege and Philip S. Jen
Strat-9
Map showing location of Strat-9 test hole
Lithologic log for Strat-9 test hole
Selected borehole geophysical logs collected in Strat-9 test hole
Figure 38. Location of Strat-9 test hole at U.S. Marine Corps Air Station, Cherry Point, North Carolina.
| Depth below land surface (in feet) | Description (compiled by C.C. Daniel, III, and B.M. Wrege) |
|---|---|
| 0.0 – 1.0 | Soil zone, roots 10YR2/2. |
| 1.0 – 2.4 | Coarse, poorly sorted SAND, silty-clayey matrix. Dark yellowish orange 10YR6/6. |
| 2.4 – 3.5 | Lost, sand? |
| 3.5 – 5.0 | Silty sand and SAND. Silty, fine sand |
| 5.0 – 6.5 | Lost, sand? |
| 6.5 – 7.7 | Fine to very fine sand, light gray. |
| 7.7 – 15.5 | CLAY, silty, sandy clay, mottled color ranges from gray to orange-tan, greenish-gray. |
| 15.5 – 17.5 | SAND, coarse, poorly sorted with gravel, some elongated pebbles to 8 mm. |
| 17.5 – 31.2 | Fine SAND with interbedded silty zones and thin, sandy clays, fining downward. 17.7–20.0, no sample. 22.0–23.5, no sample. 25.6–27.0, no sample. 30.2–31.0, no sample. |
| 31.2 – 45.0 | Fine, coarse, and very coarse SAND with scattered quartz pebbles, some elongated, well rounded, up to 9 mm in dimension. |
| 45.0 – 46.3 | Amount of gravel, very coarse SAND increases, sediment is brown to orange and appears oxidized, sharp contact at 46.3 ft with limonite zone about 1 cm thick at contact. |
| 46.3 – 60.0 | Silty, sandy shell hash with some intact shells, medium gray to very light gray N6 – N8. Matrix is, in part, calcareous. |
| 60.0 – 65.0 | Greenish-gray, silty with some clay, a few shell fragments. |
| 65.0 – 66.0 | SAND, medium to fine, moderately well sorted, medium light gray, N6. |
| 66.0 – 67.0 | Silty CLAY, clay lenses, light olive-gray, 5Y5/2. |
| 67.0 –67.3 | Cemented sand/sandstone. |
| 67.3 – 69.8 | Very fine, fine SAND, yellowish-gray, 5Y4/2. |
| 69.8 – 70.0 | Cemented sand/sandstone. |
| 70.0 – 75.3 | Silty, clayey fine SAND, moderately olive-gray, 5Y4/2. |
| 75.3 – 86.4 | A few widely scattered shell fragments. Color becomes lighter below 75 – 75.3 ft, gradational change. Very fine, silty, clayey SAND; silt and clay 30–40% (est.), yellowish-gray, 5Y7/2. |
| 86.4 – 90.5 | Color darkens, light olive-gray, 5Y5/2. 86.4, silty, sandy CLAY; clay and silt >50% (est.). |
| 90.5 – 91.4 | Transition zone. Fine silt to clay, greenish olive-green, 5GY43/2 moderate sorting. |
| 91.4 – 138.0 | Shell hash, gray, fragment size well sorted from 1/16-inch to >2-inch pieces of high angular calcite crystal matrix. 105.0, shell and coral size increasing to >1 inch. 110.0, increase in % fine matrix, decrease in shell fragments. 111.0, shells (gastropods and bivalves, highly phosphatized increase in oysters and clay, deep green-black lagoonal fines. 117.0, gravel, phosphated to coarse sand, greenish-gray (5GY6/1, wet). Poorly graded, some angular pebbles (5%), some subrounded frosted quartz pebbles (5%), some ½-inch phosphatic polished, flat, wood fragments. 125.0, increasing sand, darker gray, less shell hash (5GY6/1), increased sandy matrix. 132.0, gravel in sandy matrix, greenish-gray (5GY6/1). |
| 138.0 – 145.0 | Lagoonal deposit, very large oyster shells; shell limited by size of core barrel (up to 4 inches), blackish-green clay matrix 5GY3/2 (wet), very poorly sorted. |
| 145.0 – 161.0 | Oyster bed in green-gray sandy matrix with continuing phosphates. Very large oyster fragments. |
| 161.0 – 170.0 | LIMESTONE, unconsolidated, 0.1–0.4 shell fragments, sandy, light gray. |
| 170.0 – 175.0 | LIMESTONE, consolidated zone. |
| 175.0 – 205.0 | LIMESTONE, moldic moderately consolidated to well consolidated. Very high porosity, very high transmissivity. 180–186, yellow calcite crystals inside of bivalve mold; small, well-formed, angular crystals. 190–197, limestone, unconsolidated, moldic vuggy, shell molds ranging from 0.2 to 1.4 inches, pelecypod ridges are sharp and subangular. |
| 205.0 – 220.0 | SAND, uniform, well sorted, 80%, small percent subrounded limestone and shell fragments. Sand, uniform, medium fine, small percent very fine. |
Figure 39. Selected borehole geophysical logs collected in Strat-9 test hole, U.S. Marine Corps Air Station, Cherry
Point, North Carolina.
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